* Specifications are subject to change without notice for improvement.
NIDEK CO., LTD.
(Manufacturer)
NIDEK CO., LTD
(Tokyo Office)
NIDEK INCORPORATED
(United States Agent)
NIDEK SOCIETE ANONYME
(Authorized Representative)
: 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan
Telephone: (0533) 67-6611
Facsimile: (0533) 67-6610
: 6th Floor, Takahashi Bldg., No.2, 3-chome, Kanda-jinboucho
Chiyoda-ku, Tokyo 101-0051, Japan
Telephone: (03) 3288-0571
Facsimile: (03) 3288-0570
Telex: 2226647 NIDEK J
: 47651 Westinghouse Drive Fremont, California 94539, U. S. A.
Telephone: (510) 226-5700
Facsimile: (510) 226-5750
: Europarc 13, rue Auguste Perret, 94042 CRETEIL, France
Telephone: (01) 49 80 97 97
Facsimile: (01) 49 80 32 08
2004. 5
32163-P902C
Printed in JAPAN
NIDEK
AUTO REF/KERATOMETER
Model ARK-730A
OPERATOR’S MANUAL
BEFORE USE OR MAINTENANCE, READ THIS MANUAL.
This Operator’s Manual contains information necessary for the operation of the NIDEK
AUTO REF/KERATOMETER Model ARK-730A.
This manual includes the operating procedures, cautions for safety, specifications, and
maintenance instructions.
The instrument complies with ISO 10342 (Ophthalmic instruments—Eye
Refractometers). IEC 60601-1 is applied in this manual. The dioptric powers are
indicated with reference wavelength λd = 587.56 nm. This manual is necessary for
correct use. Especially, cautions for safety and operating procedures must be thoroughly
understood before using the instrument. Be sure to keep this manual handy to verify
use whenever necessary.
There are no user-serviceable parts inside the instrument except a printer paper and
fuses. Therefore, if you find any problems or have questions about the instrument,
please contact your authorized distributor.
Table of Contents
§1 INTRODUCTION ........................................................................................................Page
1-1
1.1 Outline of the Instrument ......................................................................................... 1-1
1.2 Classification ............................................................................................................ 1-1
1.3 Symbol Information ................................................................................................. 1-2
§2 SAFETY ........................................................................................................................ 2-1
2.1 Cautions in Storage, Transportation and Installation ............................................... 2-1
2.2 Connecting the Instrument to a Wall Outlet and Handling the Power Cord ............ 2-2
2.3 Cautions during Use ................................................................................................. 2-3
2.4 Maintenance ............................................................................................................. 2-4
2.5 Disposal .................................................................................................................... 2-4
2.6 Labels ....................................................................................................................... 2-5
§3 CONFIGURATION ..................................................................................................... 3-1
§4 OPERATING PROCEDURES ................................................................................... 4-1
4.1 Operation Flow ......................................................................................................... 4-1
4.2 Auto-Off Mode ......................................................................................................... 4-1
4.3 Preparation for Measurement ................................................................................... 4-2
4.4 AR (refractive power), KM (corneal curvature) Measurements .............................. 4-6
4.4.1 When both auto-tracking and auto-shot are ON ............................................. 4-6
4.4.2 When both auto-tracking and auto-shot are OFF .......................................... 4-14
4.4.3 When auto-tracking is ON and auto-shot is OFF .......................................... 4-16
4.5 CS (Corneal Size) Measurement ............................................................................ 4-17
4.6 PS (Pupil Size) Measurement ................................................................................. 4-19
4.7 PD (Pupillary Distance) Measurement ................................................................... 4-21
4.8 Measuring Sagittal Radius ..................................................................................... 4-23
§5 PRINTOUT ................................................................................................................... 5-1
5.1 Printing Measured Data ............................................................................................ 5-1
5.2 Eyeprint .................................................................................................................... 5-4
§6 VARIOUS SETTINGS ................................................................................................. 6-1
6.1 Setting Parameters .................................................................................................... 6-1
6.2 Setting Date and Time ............................................................................................ 6-10
6.3 Entering Comments ................................................................................................ 6-11
6.4 Measuring Hard Contact Lenses ............................................................................ 6-14
§7 TROUBLESHOOTING GUIDE ................................................................................Page
7-1
§8 MAINTENANCE ......................................................................................................... 8-1
8.1 Replacing Printer Roll .............................................................................................. 8-1
8.2 Fixing a Stack of Chin Rest Paper ........................................................................... 8-3
8.3 Replacing Fuses........................................................................................................ 8-4
8.4 Cleaning the Measuring Window ............................................................................. 8-6
8.5 Cleaning the Exterior ............................................................................................... 8-7
8.6 List of Replacement Parts ........................................................................................ 8-7
§9 SPECIFICATIONS ...................................................................................................... 9-1
9.1 Specifications ........................................................................................................... 9-1
9.2 Accessories ............................................................................................................... 9-5
9.2.1 Standard accessories........................................................................................ 9-5
9.2.2 Optional accessories ........................................................................................ 9-5
APPENDIX A GLOSSARY ................................................................................................... A-1
INDEX ...........................................................................................................End of this manual
§1
INTRODUCTION
1.1 Outline of the Instrument
The ARK-730A is an auto ref/keratometer which contains both a refractometer and a keratometer in
one unit. The refractometer objectively obtains the spherical power, cylindrical power and cylinder
axis for the lens that corrects the patient’s vision into emmetropia. The keratometer measures the
corneal curvature radius, corneal refractive power, corneal cylindrical power and corneal cylinder axis.
Weak infrared rays are used for these measurements.
This instrument has a main body and a measuring unit integrated on one base. On the base is a
chin rest on the patient’s side and a printer on the operator’s side, which outputs measured
results. On the main body is a TV monitor and a joystick which are used to make alignment and
perform operations. The measuring unit has a measuring window, through which the patient looks into
to view the chart and which the infrared rays radiate on the patient’s eye. Also, there is an auto-tracking
mechanism, which automatically moves the measuring unit up, down, right, left, back and forth to follow
eye movement, and an auto-shot function, which automatically takes serial measurements when the
instrument becomes properly in focus.
1.2 Classification
[Classification under the provision of 93/42/EEC (MDD)] Class IIa
The ARK-730A is classified as a Class IIa instrument.
[Form of protection against electric shock] Class I
The ARK-730A is classified as a Class I instrument.
A Class I instrument provides protection against electric shock and does not rely on basic
insulation only, but which includes additional safety grounding of accessible conductive parts
in the fixed wiring in such a way that accessible conductive parts cannot become live in the
event of a failure of the basic insulation.
Use a power outlet which is equipped with a grounding terminal.
[Degree of protection against electric shock] Type B Applied Part
The ARK-730A is classified as an instrument with a type B applied part.
A type B applied part provides an adequate degree of protection against electric shock,
particularly regarding:
- allowable leakage currents
- reliability of the protective earth connection (if present)
[Degree of protection against ingress of liquids] IP 20
The ARK-730A is classified as IP20*1.
The ARK-730A is a normal instrument, as such does not provide protection with respect to
harmful effects due to the ingress of water although it is protected against access to hazardous
parts with a solid matter such as a finger of 12.5 mm in diameter.
Avoid exposing water to the instrument.
*1 In accordance with IEC 60529
1-2
[Degree of protection against flammability]
The ARK-730A is classified as an instrument not suitable to be used in a potentially flammable
environment.
Do not use near flammable materials.
[Method(s) of sterilization or disinfection recommended by the manufacturer]
It is possible to wipe the forehead rest and chin rest using a cloth dampened with alcohol as
necessary.
[Mode of operation]
Classification of the ARK-730A: Continuous operation
1.3 Symbol Information
This symbol on the body indicates that caution should be taken. Refer to the operator’s
manual before use.
This indicates that the instrument is classified as an instrument with a type B applied
part.
This symbol indicates the state of the power switch. If the symbol side of the switch is
pressed down, power is supplied to the instrument.
This symbol indicates the state of the power switch. If the symbol side of the switch is
pressed down, power is not supplied to the instrument.
Fuse rating.
This indicates the interface connector for a NIDEK Lensmeter.
This indicates the interface connector for an external computer.
This indicates that the instrument must be supplied only with alternating current.
This indicates the knob for adjusting contrast.
This indicates the knob for adjusting brightness.
§2
SAFETY
The following safety precautions should always be followed.
In this manual, a Signal Word is used to designate a degree or level of safety alerting.
The definition is as follows.
CAUTION:
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury or property damage.
Even the cases mentioned in
CAUTION may result in serious injury under certain
circumstances. Be sure to observe the instructions of
CAUTION.
2.1 Cautions in Storage, Transportation and Installation
CAUTION
• The following environmental conditions must be maintained in storage (on the condition that the
instrument is packed).
- Place that is not exposed to rain or water.
- Place that is free from harmful gas or liquid.
- Place that does not contain salt, sulfur content or thick dust.
- Place that is not exposed to direct sunlight.
- Temperature: –20 to 60ºC, Humidity: 10 to 95% (Non-condensing)
• Do not drag the instrument by its cables.
Injury or instrument damage may result.
• The instrument must be carried by two persons with its base held with their both hands from
both sides of the instrument. Never hold the forehead rest, main body or measuring unit.
Injury or instrument damage may result if the instrument is carried by one person or
areas other than the base are held.
• To transport the instrument to another location, store it in a shipping carton. In such
cases, never lock the main body with the locking knob.
Breakdown of the instrument may result if it is subjected to excessive vibration or
shock.
• Connect the power cord and interface cable on a stable, level place with enough space
since the power inlet and interface connectors are provided at the base of the instrument.
• Install the instrument in a place that will never be exposed to water.
If water gets into the internal structure of the instrument, electric shock or instrument
malfunction may result.
2-2
CAUTION
• The installation location must satisfy the following environmental conditions:
- Place with low dust content
- Place with less light interference
- Stable, level place that is free from vibration or shock
The instrument may not perform measurement properly or may malfunction. In addition,
if the instrument falls because of any accidental shock, injury may result.
• Install and use the instrument in an environment where a temperature and humidity can
be maintained to the following:
Temperature:
10 to 35ºC
Humidity:
30 to 75% (Non-condensing)
Atmospheric pressure:
800 to 1060 hpa
• This instrument has been tested and found to comply with the limits for medical devices
to the IEC 60601-1-2: 2001, EN55011: 2000, Class B, Group 1. These limits are designed
to provide reasonable protection against harmful interference in a typical medical
installation. This instrument generates, uses and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions, may cause harmful interference
to other devices in the vicinity. However, there is no guarantee that interference will not
occur in a particular installation. If this instrument does cause harmful interference to
other devices, which can be determined by turning the instrument off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving device
- Increase the separation between the instruments.
- Connect the instrument into an outlet on a circuit different from that to which the
other device (s) are connected.
- Consult the manufacturer or field service technician for help.
2-3
CAUTION
• Information on the avoidance of overexposure to potentially hazardous optical radiation (ISO
15004: 1997)
Spectrally weighted photochemical radiances LB and LA give a measure of the potential that
exists for a beam of light to cause photochemical hazard to the retina. LB gives the measure
for eyes in which the crystalline lens is in place. LA gives this measure either for eyes in which
the crystalline lens has been removed (aphakes) and has not been replaced by a UV-blocking
lens or for the eyes of very young children.
The value stated for this ophthalmic instrument gives a measure of hazard potential when the
instrument is operated at maximum intensity and maximum aperture. The values of LA or LB
for the ARK-730A are sufficiently low as shown on the following page.
The retinal exposure dose for a photochemical hazard is a product of the radiance and the
exposure time. For instance, at a radiance level of 1 mW/(cm2•sr), 240 min irradiation of the
dilated (8 mm diameter) pupil would cause the retinal exposure dose level to attain the
recommended exposure limit. If the value of radiance were reduced to 0.1 mW/(cm2•sr), ten
times that time (i.e. 2400 min) would be needed to reach the recommended limit. The
recommended exposure dose is based on calculations arising from the American Conference
of Governmental Industrial Hygienists (ACGIH) - Threshold Limit Values for Chemical
Substances and Physical Agents (1995 - 1996 edition).
The following page shows the graph of spectrum output for the ARK-730A. Patients will be
at low risk of acute optical radiation with the ARK-730A. However, it is recommended that
the intensity of light directed into the patient’s eye be limited to the minimum level which is
necessary for diagnosis. The total of the retinal exposure dose must be carefully watched for
infants, aphakes and persons with diseased eyes who are at greater risk when other ophthalmic
instruments with a high level of radiance are used in conjunction.
2-4
CAUTION
Spectrum output of all light source during AR measurement (maximum light intensity)
ARK-710A / 光放射ｴﾈﾙｷﾞｰ / AR測定時
7
放射照度：(μW/c㎡)
Irradiance:
6
5
4
3
2
1
0
300
400
500
600
700
Wavelength:
波長：(nm)
800
900
1000
Spectrum irradiance
*1 LA (µW/cm2/sr) 380 - 700 nm
*2 LB (µW/cm2/sr) 305 - 700 nm
0.788
0.089
Spectrum output of all light source during KM measurement (maximum light intensity)
ARK-710A / 光放射ｴﾈﾙｷﾞｰ / KM測定時
7
放射照度：(μW/c㎡)
Irradiance:
6
5
4
3
2
1
0
300
400
500
600
700
800
900
Wavelength:
波長：(nm)
Spectrum irradiance
*1 LA (µW/cm2/sr) 380 - 700 nm
*2 LB (µW/cm2/sr) 305 - 700 nm
*1
*2
0.008
0.001
LA: Spectrally weighted photochemical aphakic source radiance
LB: Spectrally weighted photochemical phakic source radiance
1000
2-5
{ Patient environment
The patient environment represents a space where there is a possibility of direct contact between
the patient or the operator and third person.
When another type of device is used in the patient environment, use a device that complies with IEC
60601-1. If the devices that do not comply with IEC 60601-1 are used, it is necessary to use an
isolating transformer to power the device or to connect the devices to additional protective grounding.
Radius of 1.5 m
2.5 m
1.5 m
1.5 m
2-6
2.2 Connecting the Instrument to a Wall Outlet and
Handling the Power Cord
CAUTION
• Be sure to use an outlet equipped with a grounding terminal which meets the specified power
requirements.
The instrument may not deliver full performance, or malfunction or fire may result. In addition,
if the outlet is not equipped with a grounding terminal, there is a fear of electric shock in the
event of power leak.
• Securely connect the mains plug into an outlet.
Insecure connection may result in fire.
• To disconnect the mains plug, hold it.
If the power cord is pulled, short circuit or electric shock may result in case of break in the
wires inside the power cord.
• Never put heavy objects on the power cord nor catch the cord between any objects.
The cover of the power cord may become worn and fire or electric shock may result.
• If the metal core of the power cord is exposed, the power turns on and off by shaking the power
cord, or cord or plug gets so heated that one cannot hold it, it means that the cord is damaged.
Replace the power cord immediately.
Electric shock or fire may result.
• Wipe between the prongs of the mains plug with a dry cloth every one in a while.
If dust settles between the prongs, the dust easily takes up moisture, and short circuit and fire
may result.
• If the instrument will not be used for a long time, disconnect the power cord from the wall outlet.
Fire may result.
2.3 Cautions during Use
CAUTION
• Do not use the instrument for other than the intended purpose.
NIDEK is not responsible for accidents or malfunction caused by misuse.
• Never disassemble nor touch the inside of the instrument.
An electric shock or instrument malfunction may result.
2-7
CAUTION
• In advance of measurement of each patient, wipe the forehead rest and chin rest with a clean
cloth such as gauze. If necessary, wipe the forehead rest and chin rest using a cloth dampened
with rubbing alcohol.
• Keep fingerprints and dust away from the measuring window.
Reliability of the measured data may be lowered substantially.
• When the instrument is not in use, turn it off and place the cover over the instrument.
If the instrument is not covered, dust may accumulate and affect measurement accuracy.
• In the event of failure in the instrument, do not touch the inside of the instrument, but disconnect
the power cord from the outlet and contact your authorized distributor.
2.4 Maintenance
CAUTION
• Before fuse replacement, turn the instrument OFF and disconnect the power cord from the wall
outlet.
Electric shock may result.
• Replace the fuses with the specified fuses only.
Fire may result.
• Never use an organic solvent such as paint thinner to wipe off the exterior.
This may ruin the surface.
• Service work should be performed only by service persons authorized by NIDEK.
NIDEK is not responsible for any accidents resulted from improper servicing.
• When the instrument is not in use, turn off the power switch and place a cover over the instrument.
If the instrument is not covered, dust may affect measurement accuracy.
• When the instrument is sent back to NIDEK for repair or maintenance, wipe the surface
(especially, the area where the patient’s skin contacts) of the instrument with a clean cloth
immersed in ethyl alcohol for disinfection.
• Contact NIDEK or your authorized distributor to check whether the instrument needs
measurement accuracy calibration if the AR-measured results are largely different from
the subjective measurements.
NIDEK is not responsible for any accidents resulted from improper servicing.
2-8
2.5 Disposal
NOTE
• Follow local governing ordinances and recycling plans regarding disposal or recycling of device
components.
The instrument contains the circuit board with the lithium battery. Because the disposal method
of lithium batteries varies according to the government, follow the local governing ordinates
and recycling plans when disposing of the circuit board with the lithium battery.
• When disposing of packing materials, sort them by material and follow local governing ordinances
and recycling plans.
2-9
2.6 Labels
The following labels and indications are affixed to draw the operator’s attention.
or
or
or
or
or
§3
CONFIGURATION
Measuring unit
Main body
TV Monitor
Start Button
Display Panel
Joystick
Memory Indicator
Print Button (Clear Button)
Change Button
R/K Button
AUX. Button Cover
Locking Knob
Base unit
IOL Button
Power Switch
Printer
3D Auto Button
UP Button
View Comparison Button
DOWN Button
TV Monitor
Displays the patient’s eye, target, focusing
indicator, alignment light projected on the
patient’s eye, etc.
Display Panel
Displays measured data of AR (refractive
power), CS (corneal size), PS (pupil size), and
PD (pupillary distance) measurements.
SPH: Spherical power
CYL: Cylindrical power
AXIS: Cylinder axis
The indicator of R (right) or L (left) shows
the measuring eye side as well as the eye
side of measured data on the display.
AUX. Button Cover
Used to cover the buttons that are seldom
used.
See p. 3-5 for details of the buttons inside
the cover.
Locking Knob
Used to fix the main body to the base unit.
To lock the main body, bring it to the center
of the base unit and turn the knob counterclockwise while holding it down. To temporarily lock the body at any position, turn the
knob clockwise.
Do not lock the main body with this locking
knob during transportation. Otherwise, breakdown of the instrument may result.
3-2
Used to move the guidelines on the TV monitor during CS and PS measurements.
It is also used to change parameter settings,
date & time settings and enter comments.
Used for the comparison function.
Changes the current viewing condition
(unaided eye or corrected with glasses that
the patient uses) and the viewing condition corrected according to AR measurement.
Used to check the viewing condition for near
vision.
Pressing this button again returns the instrument to its original state. It is also used
to move the guidelines on the TV monitor
during CS and PS measurements, and
change parameter settings, date & time
settings and enter comments.
Changes between ON and OFF of the autotracking and auto-shot functions.
Used when an IOL-implanted eye or an eye with
a contact lens on is measured.
If such eyes are measured without turning
on the IOL mode, an error may appear and
measurement may not be completed.
Used to change modes to select whether to
perform AR measurement and KM measurement in succession or separately.
The mode changes in the order of R/K
mode (AR and KM in succession), → R
mode (AR measurement), → K mode (KM
measurement)→ R/K mode... .
Used to change from AR/KM measurement
to CS/PS/PD measurement.
By pressing this button, the mode changes
in the order of CS, → PS, → Manual PD,
→ CS... . (To change back from CS/PS/PD
measurements to AR/KM measurements,
press
.)
Prints measured results.
Holding down this button for two seconds
does not print but clears measured data.
Memory Indicator
Indicates that measured data is being stored
in memory.
Illuminated:
Being stored
Not illuminated: Not being stored
Flashing:
Auto-off mode
Joystick
Used to move the main body right, left, back
and forth.
Manipulating the lever moves the main
body right, left, back and forth. Turning
the upper part of the lever moves the measuring unit up and down.
Start Button
Used to start AR, KM, and PD measurements.
It is also used to change the item number
of system parameters.
3-3
Auto-shot ON Mark
Auto-tracking ON Mark
Mire Ring
Cylinder Mode Indication
Focusing Indicator
Measurement Mode
Measurement Count
KM Measurement
(Latest values)
R1: Flattest meridian
R2: Steepest meridian
AXIS: Corneal cylinder axis
Target
Min. Pupil Mark
[Measurement Screen]
COMPARE Indication
Data to be compared with
AR-measured data
[Screen during View Comparison]
AR-measured data
SPH: Spherical power
CYL: Cylindrical power
AXIS: Cylinder axis
3-4
Auto-shot ON Mark
Shows that the auto-shot function is active.
Auto-tracking ON Mark
Shows that the auto-tracking function (up,
down, left and right) and/or auto-focusing
function are active.
Mire Ring
Used as alignment reference ring.
When the auto-tracking function is on,
bring this ring close to the target so that
the instrument automatically starts alignment.
When the auto-tracking function is off,
place the ring concentric with the target.
The ring can also be used to observe the
shape of the corneal surface.
Cylinder Mode Indication
Indicates the current cylinder mode.
Focusing Indicator
Indicates the distance between the measuring
unit and the patient’s eye when the auto-tracking function is on.
Target
Used as a guide to place the patient’s eye in
the center of the TV monitor during AR and
KM measurements.
Min. Pupil Mark
Indicates the minimum pupil size measurable.
The instrument may not perform measurement when the measuring eye is smaller
than this mark or eyelashes are on this
mark.
COMPARE Indication
Indicates that the View Comparison function
is active.
Data to be compared with AR-measured
data
“ ”⇒ Unaided eye
“LM”⇒ Patient’s glasses
When data of the patient’s glasses is transferred from a lensmeter, the dioptric powers of the glasses will be shown.
When the patient looks at the chart with
these dioptric powers, “ ” or “LM” on
the left of the monitor will flash.
AR-measured data
Indicates median values or latest values.
When the patient looks at the chart with
these dioptric powers, “AR” on the left of
the TV monitor will flash.
3-5
Contrast Control
Brightness Control
Setting Button
CYL Mode
Change Button
Eyeprint Button
[Auxiliary Buttons]
3-6
Contrast Control
Used to adjust the contrast of the TV monitor.
Brightness Control
Used to adjust the brightness of the TV monitor.
Used to set system parameters, date and time,
and enter comments.
Prints the eyeprint view of measured data.
The eyeprint is printed out regardless of its
parameter setting. It is also used to change
parameter settings, date & time settings and
enter comments.
Changes the cylinder mode, the reading direction of cylinder data.
+ mode ....... Cylinder data will be indicated
by + reading.
– mode ........ Cylinder data will be indicated
by – reading.
MIX mode .. Cylinder data will be indicated
by + reading when the refractive power is positive for any
axis angle. In other cases, cyl.
data will be indicated by – reading.
• The cylinder mode can be changed even after measurement.
• Data will be printed out with the mode status at the time of printout.
3-7
Forehead Rest
Measuring Window
Eye Level Marker
LED for Corneal Illumination
Chin Rest
PD Window
Chin Rest Knob
[Top view]
TV Monitor H Control
[Underside view]
TV Monitor V Control
Interface Connectors
Fuses
Power Inlet
[Underside]
3-8
Measuring Window
Patient looks at the chart through this window.
Eye Level Marker
Used as a guide for the patient’s eye level for
measurement.
The height of the chin rest should be adjusted so that the center level of the
patient’s eye almost aligns with this line.
Chin Rest Knob
Turning the chin rest moves the chin rest up
and down. Use the eye level marker as a guide
to adjust the patient’s eye level to the comfortable height for measurement.
TV Monitor H Control
Adjusted with a screwdriver when the TV monitor does not lock horizontally. Can be found on
the underside of the main body.
TV Monitor V Control
Adjusted with a screwdriver when the TV monitor does not lock vertically. Can be found on the
underside of the main body.
Interface Connectors*1
side:
Connect the interface cable to transfer measured data to the refractor RT-2100/RT-1200
or ICS-100 (IC card system).
side:
Connect the interface cable from a lensmeter
to import measured data from the lensmeter.*2
By connecting a lensmeter to the
side
and the refractor RT-2100/RT-1200 to the
side, the LM (Lensmeter) data can be
transferred to the refractor via the ARK.
Pressing the print button on the lensmeter
starts data transfer.
*1 Accessory equipment connected to the analog and digital interfaces must be certified according
to the representative appropriate national standards (for example, UL 1950 for Data Processing
Equipment UL 2601-1 for Medical Equipment, and CSA C22.2 No. 601-1, EN 60601-1, and
IEC 60601-1.) Furthermore all configurations shall comply with the system standard IEC
60601-1-1. Anyone who connects additional equipment to the signal input part or signal output
part configures a medical system, and is therefore responsible that the system complies with
the requirements of the system standard IEC 60601-1-1. If in doubt, consult the technical
service department or your local representative.
*2 When communicating with a lensmeter, set communication parameters for each instrument as
follows: For the setting procedure, see the Operator’s Manual of each instrument.
• ARK-730A
• NIDEK Lensmeter
53: Baud Rate = 9600
RS-232C = NIDEK
Data Bits = 8
54: Bit Length = 8
Baud Rate = 9600
Stop Bits = 1
56: IN Port Sel. = LM
Parity = Odd
§4
OPERATING PROCEDURES
4.1 Operation Flow
Power ON
4.3 Preparation for Measurement
(p. 4-2)
Measurements
→4.4 AR (refractive power), KM (corneal curvature) Measurements
→4.4.1 When both auto-tracking and auto-shot are ON (p. 4-6)
→4.4.2 When both auto-tracking and auto-shot are OFF (p. 4-14)
→4.4.3 When auto-tracking is ON and auto-shot is OFF (p. 4-16)
→4.5 CS (Corneal Size) Measurement (p. 4-17)
→4.6 PS (Pupil Size) Measurement (p. 4-19)
→4.7 PD (Pupillary Distance) Measurement (p. 4-21)
→4.8 Measuring Sagittal Radius (p. 4-23)
5. PRINT OUT
(p. 5-1)
Power OFF
(Determine final prescription by subjective refraction.)
4.2 Auto-Off Mode
The instrument will go into the auto-off mode automatically to save power if no operation is
performed for five minutes*1.
OFF
The auto-off mode places the instrument into the
following conditions:
Time
• The TV monitor goes off.
Flashing
• Time appears on the display panel.
• The memory indicator flashes.
The instrument recovers to the normal mode from the auto-off mode by the following methods:
• Press any switch.
• Manipulate the joystick to move the base R or L.
NOTE
• The instrument may not go into the auto-off mode depending on the condition of the screen.
• When the instrument goes into the auto-off mode from the Comparison View function
screen, it will recover to the normal mode. (Only when the “Compare SW” parameter
is set to “Manu.”)
• When the instrument goes into the auto-OFF mode from the screen of CS, PS or PD
measurement, it will recover to the normal mode.
*1 Time to activate the auto-off mode can be changed. The parameter setting can be set so that
the auto-off mode will not activate. See “6.1 Setting Parameters” (p. 6-1).
4-2
4.3 Preparation for Measurement
Auto-shot ON Mark
Auto-tracking ON Mark
1. Turn ON the power switch.
The display panel indicates as shown on the
right. On the TV monitor are the Target,
Focusing Indicator and Min. Pupil Mark in the
center, Auto-tracking ON Mark, and Auto-shot
ON Mark in the upper center, Cylinder Mode
on the upper right, and Measurement Count on
the lower left.
Min. Pupil Mark
Focusing Indicator
Target
When the power is turned on, the main body
makes small right/left movements in order to
determine the initial setting position for autotracking. This does not mean that the
instrument has been broken.
NOTE
• If “<PD ERR>” is shown on the left of
the TV monitor, the instrument may not
recognize the left eye or right eye
(measurement may not be performed
binocularly), and also PD (pupillary
distance) may not be measured. Check
the PD window. If the PD window is
covered by anything, remove it. If
covered by dust, wipe lightly with a swab
with little alcohol to clean it.
If “<PD ERR>” is still shown on the
monitor even after performing the
corrections described above, install the
instrument in a low light interference
environment since the error may occur
due to light interference.
PD Window
NOTE
• “Err” will appear on the display panel if the power is turned on with no printer paper
in.
To correct the condition, turn on the power switch again after setting the printer
paper.
4-3
2. Open the AUX. button cover and set measurement conditions.
The cover can be opened by sliding it to the
left.
a.
:
See “6. VARIOUS SETTINGS” for details of
setting parameters.
b.
:
Set the cylinder mode, indication of cylinder
reading direction.
CYL + .... Indicates cylindrical power by + reading.
CYL – ..... Indicates cylindrical power by – reading.
CYL ± .... Indicates the cylindrical power by + reading when the refractive power is positive
(MIX)
for any axis angle. Indicates the cyl. power by – reading in other cases.
* The cylinder mode can be changed even after measurement.
* Data will be printed out with the mode status at the time of printout.
* When the cylinder mode is set to CYL+, the AXIS value of KM measurement indicates the
angle of the steepest meridian. In other cases (CYL–, CYL±), the AXIS value indicates the
angle of the flattest meridian.
4-4
3. Press
to select the measurement mode.
The mode changes in the order of R/K→ R→ K→ R/K... .
R/K mode ............. AR/KM measurement in succession
R mode ................. AR measurement
K mode ................. KM measurement
4. If you are AR-measuring an IOL-implanted eye or an eye with a contact lens on, turn on
the IOL mode by pressing
.
The IOL ON mark will appear on the top left of the TV monitor.
NOTE
• When an IOL-implanted eye or an eye
with a contact lens on is measured, the
IOL mode must be turned on. If such eyes
are measured without turning on the IOL
mode, an error message may appear and
measurement may not be completed.
IOL ON Mark
• The IOL mode will automatically turn off
by sliding the main body or after printout.
• The IOL mode will automatically turn on
when a measurement error has occurred
three times in a row. (Auto IOL*2)
5. Prepare the patient’s condition.
1) Clean the forehead rest and chin rest with clean gauze.
If a stack of chin rest paper is fixed on the chin rest, remove one sheet of paper.
2) Instruct the patient to take off his/her glasses or contact lenses and have a seat.
*2 <IOL mode>
See “6.1 Setting Parameters” for details of setting parameters.
4-5
3) Instruct the patient to place his/her chin on
the chin rest and forehead on the forehead
rest.
Eye Level Marker
Chin Rest Knob
4) Adjust the height of the chin rest by turning
the chin rest knob until the center level of
the patient’s eye aligns with the eye level
marker.
NOTE
• To relax the patient, explain as follows before measurement. “This instrument measures
your eye with infrared ray to find which kind of lens fits you. The infrared ray does no
harm to your eyes.”
4-6
4.4AR (refractive power), KM (corneal curvature) Measurements
4.4.1 When both auto-tracking and auto-shot are ON
Alignment and focusing are automatically performed and measurement starts when in the optimum
position. When the auto-tracking function is ON, auto-focusing is also performed.
1. Make sure that
(Auto-shot ON Mark) and
(Auto-tracking ON Mark) are shown
on the upper part of the TV monitor.
When they are not shown, press
to turn on the auto-tracking and auto-shot functions.
2. Perform rough alignment.
1) Instruct the patient to: “Look through the measuring window. As you will see a picture of a
balloon, watch the center of it without straining.
2) Manipulate the joystick to place the patient’s eye on the TV monitor.
By moving the joystick laterally, the main body moves right, left, back and forth. By turning
the upper part of the joystick, the main body moves up and down. Align the eye position to
the measuring point with right, left, up and down movements. Adjust the focus with back
and forth movements.
NOTE
• If the mire ring is not in the center of the pupil and the Min. Pupil Mark is on the iris,
turn off the auto-tracking function and bring the Min. Pupil Mark into the center of the
pupil to perform measurement, ignoring the mire ring.
• Auto-tracking or auto-shot may not work on keratoconus or postoperative cornea. In
such a case, turn off the auto-tracking and auto-shot functions. See “4.4.2 When both
auto-tracking and auto-shot are OFF” (p. 4-14).
4-7
3. Bring the mire ring close to the target so that the instrument starts alignment automatically.
The auto-tracking function does not work unless the mire ring is at around the center of the
measurement field. If the ring is too far off the center, manipulate the joystick to move it in.
When the position of the mire ring gets out of the working range of auto-tracking, “<LIMIT>”
appears on the left. In such a case, either manipulate the joystick in the direction of the arrows
or pull the joystick forward once and perform alignment again.
↑:
↓:
→:
←:
Turn the grip of the joystick clockwise.
Turn the grip of the joystick counterclockwise.
Tilt the joystick slightly to the right.
Tilt the joystick slightly to the left.
:
Push the joystick backward.
:
Pull the joystick forward.
Move the joystick back and forth until the
focusing indicator shows the optimum state
“
”.
Too close to the patient’s eye
Pull the joystick forward to move the main body away from the
patient’s eye.
Optimum state
Push the joystick backward to move the main body toward the patient’s
eye.
Too far from the patient’s eye
NOTE
• Measurement starts automatically when the instrument is best aligned and in focus.
• The instrument may not perform correct measurement when the eyelashes are on the
Min. Pupil Mark. In such cases, instruct the patient to open his/her eye wider. If the
patient cannot open wider, lift the patient’s lid, paying attention not to press against the
eyeball.
4-8
4. Measurement starts automatically when the instrument is best aligned and in focus.
NOTE
• Instruct the patient not to blink during measurement.
• The operator can start measurement by pressing the start button.
Press the start button to start measurement when measurement has difficulty starting
for patients who blink often.
• When an error or error data*3 appears, the
cause may be one of those described
below. If those signs appear again after
repeating measurement, check the
following:
a. Patient blinked during measurement.
b. The eyelid or eyelashes are on the Min. Pupil Mark.
c. The patient’s pupil is smaller than the Min. Pupil Mark. (Have the patient sit in a
dark room for a while and wait until the pupil diameter becomes large enough for
measurement.)
d. Retinal reflection is extremely low due to an optical condition such as a cataract.
e. There is some unusual reflection on the cornea during measurement. (In this case,
measurement may not be performed unless the IOL mode ( ) is on.)
f. There is extreme distortion of the cornea.
A. When the measurement mode is set to <<R/K>>:
A short beep is heard.
KM measurement starts.
The measurement count will be shown on the TV monitor.
When the median values are obtained and then KM measurement is completed, the latest values
of the KM-measured data will be shown on the TV monitor.
A short beep is heard again.
The patient’s view is fogged.
*3 <Error data>
Data in which the confidence index of AR measurement is “E”. See “6.1 Setting Parameters”.
4-9
AR measurement starts.
A long beep will be heard and the measurement count will be shown on the TV monitor.
When the median values are obtained,
measurement will be completed.
“<FINISH>” will appear on the left of the TV
monitor. The latest values are always shown
on the display panel.
* When the “Compare SW” parameter is set
to “Auto”, the screen will change to the View
Comparison function screen after
measurement.
NOTE
• The AI mode*4 is automatically activated regardless of its parameter setting and
measurement starts in the High-speed mode*5 without pressing the start button.
• If “Error Data” of the parameter is set to “YES” and there are not any variations in the three
measurements, the AR measurement ends. If there is an error data (confidence coefficient=E)
in the measurements, the AR selected value is not obtained.
• To continue AR measurement, pressing the start button clears “<FINISH>” and restarts
auto-tracking and measurement (except when the “Compare SW” parameter or “Print”
parameter is set to “Auto”).
• The instrument can store up to 10 measurements each for the right and left eyes. If
measurements exceed 10, the oldest data will be cleared in order.
⇒ Go on to step 5 (p. 4-11).
*4 <AI mode>
This is a mode in which AR/KM measurement is completed as soon as the median values are
obtained.
*5 <High-speed mode>
This mode allows continuous AR measurement with the fog maintained from the second measurement.
See “6.1 Setting Parameters” for details of setting parameters.
4 - 10
B. When the measurement mode is set to <<R>>:
A short beep is heard.
The patien’s view is fogged.
AR measurement starts.
A long beep will be heard and the measurement count will be shown on the TV monitor.
When the median values are obtained, measurement
will be completed.
“<FINISH>” will appear on the left of the TV
monitor. The latest values are always shown
on the display panel.
* When the “Compare SW” parameter is set
to “Auto”, the screen will change to the View
Comparison function screen after
measurement.
NOTE
• To continue AR measurement, pressing the start button clears “<FINISH>” and restarts
auto-tracking and measurement (except when the “Compare SW” parameter or “Print”
parameter is set to “Auto”).
• The instrument can store up to 10 measurements each for the right and left eyes. If
measurements exceed 10, the oldest data will be cleared in order.
⇒ Go on to step 5 (p. 4-11).
4 - 11
C. When the measurement mode is set to <<K>>:
A short beep is heard.
The patient’s view is fogged.
KM measurement starts.
The measurement count will be shown on
the TV monitor.
When the median values are obtained, KM
measurement will be completed.
The latest values of KM-measured data will
be shown on the TV monitor.
⇒ Go on to step 7 (p. 4-13).
5. If necessary, change the patient’s viewing condition using the View Comparison function
(only when AR measurement has been performed).
The View Comparison function allows the patient to compare the current viewing condition
(unaided eye or corrected with glasses that the patient uses) and the viewing condition corrected
according to AR measurement. By changing the distance to the chart, the patient can also
check the viewing condition for near vision.
Step 5 can be performed after both eyes are measured.
1) Press
to set the viewing condition
corrected according to AR measurement.
T h e m o n i t o r w i l l s h o w t h e Vi e w
Comparison function screen.
“AR” flashes, which indicates the viewing
condition corrected according to AR
measurement. When the “Compare SW”
parameter is set to “Auto”, the monitor will
show the View Comparison function screen
automatically as soon as the median values are
obtained.
Flashing indicates the current viewing condition.
“ ” flashes: View without correction (unaided eye)
“LM” flashes: View corrected with glasses that the
patient uses
“AR” flashes: View corrected according to AR
measurement
4 - 12
2) Press
again to set the viewing condition without correction (unaided eye).
“ ” flashes, which indicates the viewing condition without correction.
If data of the patient’s glasses has been transferred from a NIDEK lens meter, “LM” will
flash instead of “ ” and the patient can experience the viewing condition corrected with
his/her glasses. The optional interface cable is required for data transfer.
3) Change the current viewing condition (unaided eye or corrected with glasses that the patient
to
uses) and the viewing condition corrected according to AR measurement by pressing
allow the patient to recognize the variation between them.
NOTE
• The dioptric power that the patient can
experience during the View Comparison
function includes only spherical
component, not cylindrical component.
Sample of spherical equivalent
Therefore, spherical equivalent (SE value)
or highest power (spherical power and
cylindrical power) is used instead of actual
AR-measured data. The dioptric power
Sample of highest power
to be used is shown on the display panel.
Whether to use spherical equivalent or highest power can be selected by the “Compare
(AR)” parameter.
Spherical equivalent is used for the viewing condition with data of the patient’s glasses
transferred from a lensmeter.
• The View Comparison function must be performed with the target aligned in every
direction and in focus, as well as in measurement. When the target is misaligned,
perform alignment and focusing again, following step 3.
6. If necessary, change the patient’s viewing condition for near vision.
1) Set the condition that “AR” flashes.
2) Press
.
The working distance to the chart will
change from the normal distance (5 mequivalent) to 35 cm-equivalent*6. “
35CM” will appear on the left of the TV
monitor. The patient can experience the
viewing condition corrected according to
AR measurement for near vision. Pressing
again will return the working distance
to the normal distance (5 m-equivalent).
*6 The near working distance of the chart can be set from 35 to 70 cm (5 cm increments) or 14 to 28
inches (2 inch increments) using the parameter.
4 - 13
Pressing
with “ ” (or “LM”) flashing allows the patient to experience the viewing condition
without correction (unaided eye).
3) Pressing the start button with “ 35CM”
shown adds the addition power of 1.75D*7.
“ADD1.75D” will appear on the left side of
the TV monitor. The patient can know
whether the addition power needs to be
added with bifocal lenses or progressive
lenses.
Pressing the start button again cancels the
addition power.
If the chart distance returns to the normal distance (5 m-equivalent) by pressing
, the
addition power will be cleared.
If the viewing condition is changed between AR measurement and the unaided eye by pressing
, the addition power will be cleared.
7. Measure the other eye in the same manner.
.
8. Press
See “5.1 Printing Measured Data” (p. 5-1).
Measured data will be printed out and the View Comparison function screen will return to the
normal measurement screen.
*7 The addition power can be selected from the parameter settings of 1.5D, 1.75D, and 2.0D.
4 - 14
4.4.2 When both auto-tracking and auto-shot are OFF
1. Make sure that
(Auto-shot ON Mark) and
(Auto-tracking ON Mark) are not shown
on the upper part of the TV monitor.
to turn off the auto-tracking and auto-shot functions. When
When they are shown, press
the auto-tracking function is OFF, auto-focusing is not also performed.
2. Perform rough alignment.
1) Instruct the patient to: “Look through the measuring window. As you will see a picture of a
balloon, watch the center of it without straining.
2) Manipulate the joystick to place the patient’s
eye on the TV monitor.
By moving the joystick laterally, the main
body moves right, left, back and forth. By
turning the upper part of the joystick, the
main body moves up and down. Align the
eye position to the measuring point with
right, left, up and down movements. Adjust
the focus with back and forth movements.
Min. Pupil Mark
Target
Mire Ring
NOTE
• If the mire ring is not in the center of the pupil and the Min. Pupil Mark is on the iris,
bring the Min. Pupil Mark into the center of the pupil to perform measurement, ignoring
the mire ring.
3) Adjust the focus by moving the joystick back and forth so that the mire ring becomes
minimum.
NOTE
• The instrument may not perform correct measurement when the eyelashes are on the
Min. Pupil Mark. In such cases, instruct the patient to open his/her eye wider. If the
patient cannot open wider, lift the patient’s lid, paying attention not to press against the
eyeball.
3. Start measurement.
Press the start button.
4 - 15
NOTE
• Instruct the patient not to blink during measurement.
• The instrument can store up to 10 measurements each for the right and left eyes. If
measurements exceed 10, the oldest data will be cleared in order.
• When the “AI Mode” parameter is set to “NO”, take about three shots for AR
measurement. If the measured data is not stable, take some additional shots.
• When an error or error data appears, the
cause may be one of those described
below. If those signs appear again after
repeating measurement, check the
following:
a. Patient blinked during measurement.
b. The eyelid or eyelashes are on the Min. Pupil Mark.
c. The patient’s pupil is smaller than the Min. Pupil Mark. (Have the patient sit in a
dark room for a while and wait until the pupil diameter becomes large enough for
measurement.)
d. Retinal reflection is extremely low due to an optical condition such as a cataract.
e. There is some unusual reflection on the cornea during measurement. (In this case,
measurement may not be performed unless the IOL mode ( ) is on.)
f. There is extreme distortion of the cornea.
The measuring procedure is the same as “A: When the measurement mode is set to <<R/K>>”
(p. 4-8), “When the measurement mode is set to <<R>>” (p. 4-10) and “When the measurement
mode is set to <<K>>” (p. 4-11). However, the timing when AR or KM measurement is completed
differs from when both auto-tracking and auto-shot functions are ON.
When the “AI Mode” parameter is set to “YES”:
KM measurement; Measurement is performed until median values are obtained.
AR measurement; If there are not any variations in the three measurements, measurement
ends.
When the “AI Mode” parameter is set to “NO”:
KM measurement; Three measurements are performed in succession. The number of
measurements can be set in the parameter.
AR measurement; Serial measurement is performed while the start button is being pressed.
4. If necessary, change the patient’s viewing condition.
See steps 5 - 6 of “4.4.1 When both auto-tracking and auto-shot are ON” (p. 4-11).
5. Measure the other eye in the same manner.
6. Press
.
See “5.1 Printing Measured Data” (p. 5-1).
Measured data will be printed out and the View Comparison function screen will return to the
normal measurement screen.
4 - 16
4.4.3 When auto-tracking is ON and auto-shot is OFF
This is a method by which alignment and focusing are automatically performed and the operator
determines the measurement timing by pressing the start button.
(Auto-tracking ON Mark) is shown and
1. Make sure that
(Auto-shot ON Mark) is
not shown on the upper part of the TV monitor.
to change the setting. (The “Tracking
When the screen is not shown as described above, press
SW” parameter must be set to “T&S/T/M” or “T/M” in advance.)
2. Perform rough alignment and focusing.
See steps 2 - 3 of “4.4.1 When both autotracking and auto-shot are ON” (p. 4-6).
3. Start measurement.
See step 3 of “4.4.2 When both auto-tracking and auto-shot are OFF” (p. 4-14).
4. If necessary, change the patient’s viewing condition.
See steps 5 - 6 of “4.4.1 When both auto-tracking and auto-shot are ON” (p. 4-11).
5. Measure the other eye in the same manner.
6. Press
.
See “5.1 Printing Measured Data” (p. 5-1).
Measured data will be printed out and the View Comparison function screen will return to the
normal measurement screen.
4 - 17
4.5 CS (Corneal Size) Measurement
Fiducial line
1. Press
.
“<<CORNEAL SIZE>>”, a fiducial line, and a
guide line will appear on the TV monitor. The
display panel shows “12.0” which is the default
of CS measurement.
The mode changes as follows for every press
of
.
AR/KM → CS → PS → PD
↑
2. Manipulate the joystick to align the fiducial
line with the left end of the patient’s cornea.
3. Move the joystick back and forth to focus
the mire ring.
NOTE
• If the fiducial line has been out of
alignment, repeat step 2.
4. Move the guide line on the right of the TV
monitor with
or
to align it with the
right end of the patient’s cornea.
...............The guide line moves to the right.
(The display panel indication increases.)
...............The guide line moves to the left.
(The display panel indication decreases.)
NOTE
• The indication changes in increments of
0.5 mm.
5. Press the start button.
Measured data will be entered.
Guide line
4 - 18
6. Measure the other eye in the same manner.
NOTE
• When the “AI Mode” parameter is set to “YES” and “Print” parameter to “Auto”, CS
measurement must be performed before AR/KM measurement in order to print data
together with AR/KM results.
7. To go on to AR/KM measurement .......... Press
.
To go on to PS measurement...................... Press
once.
To go on to PD measurement ....................... Press
twice.
4 - 19
4.6 PS (Pupil Size) Measurement
Fiducial line
1. Press
.
(From CS measurement, press once; from AR/
KM measurement, press twice.)
“<<PUPIL SIZE>>”, a fiducial line, and a guide
line will appear on the TV monitor. The display
panel shows “5.0” which is the default of PS
measurement.
2. When the pupil size is measured in a dark
place, turn off the chart-illuminating lamp
in the measuring window.
Press
to turn ON or OFF the chartilluminating lamp.
When the chart-illuminating lamp is off,
“LAMP=OFF” will be shown under “<<PUPIL
SIZE>>”. Instruct the patient not to look round
and watch ahead without straining.
3. Manipulate the joystick to align the fiducial
line with the left end of the patient’s pupil.
4. Move the joystick back and forth to make
focus of the mire ring.
NOTE
• If the fiducial line has been out of
alignment, repeat step 3.
5. Move the guide line on the right of the TV
monitor with
or
to align it with the
right end of the patient’s pupil.
..... The guide line moves to the right.
(The display panel indication increases.)
..... The guide line moves to the left.
(The display panel indication decreases.)
NOTE
• The indication changes in increments of
0.5 mm.
Guide line
4 - 20
6. Press the start button.
Measured data will be entered.
7. Measure the other eye in the same manner.
NOTE
• When the “AI Mode” parameter is set to “YES” and “Print” parameter to “Auto”, PS
measurement must be performed before AR/KM measurement in order to print data
together with AR/KM results.
8. To go on to AR/KM measurement .......... Press
.
To go on to PD measurement ..................... Press
once.
To go on to CS measurement ..................... Press
twice.
4 - 21
4.7 PD (Pupillary Distance) Measurement
A. Auto-PD measurement (when the “Auto-PD” parameter is set to “YES”)
At the moment where measurement of both eyes
is completed, PD measurement will have been
completed. The near PD will be automatically
calculated.
PD (Pupillary Distance)
NOTE
• PD value is printed out with measured data.
• The calculated near PD is not shown on the display panel but printed out with ARmeasured data (only when the “Near PD” parameter is set to “YES”).
B. Manual PD measurement (when the “Auto-PD” parameter is set to “NO”)
.
1. Press
(From CS measurement, press once; from AR/
KM measurement, press twice.)
Indications for PD measurement will appear on
the display panel.
2. Instruct the patient not to move his/her head
and eyes during measurement.
3. After proper alignment of the right eye and
left eye, press the start button each time.
NOTE
• If the patient’s head is tilted, straighten it before starting measurement.
• To measure monocular PD at the same time as the binocular PD, press the start button
every after proper alignment of the right-eye, center, and the left-eye.
To press the start button in the exact center position, have a patient wear the frames
with a mark on its center and bring the mark in focus.
It is recommendable to use the pupil distance meter such as the NIDEK PM-600 in
order to obtain precise monocular PD.
4 - 22
NOTE
• The r (right), c (center), and l (left) signs on the display panel disappear in turn as the
start button is pressed to show that detection of each position has been completed.
4. When measurement is completed, measured data will be shown on the display panel.
4 - 23
4.8 Measuring Sagittal Radius
1. Set the “Sagittal”parameter to “YES”.
See “6.1 Setting Parameters” for the procedure.
NOTE
• If the “Print” parameter has been set to
“Auto”, it must be set back to “Manu.”.
2. On condition that KM measurement has
been made, press
.
The measurement mode will change to the
sagittal radius measurement mode: The
indications of “L” (Left), “R” (Right), “U” (Up),
and “D” (Down) will appear and “L” will flash
to show the position of the illuminated fixation
light that the patient will look at.
NOTE
• The median KM values or the latest KM
values will be shown on the TV monitor.
• To quit sagittal radius measurement, press
.
3. Instruct the patient to look at the red light
on the left side and not to move his/her head.
4. Manipulate the joystick to place the mire
ring concentric with the target.
5. Move the joystick back and forth to focus
the mire ring until it becomes its thinnest.
4 - 24
6. Press the start button.
The sagittal radius of the right part of the cornea
will be measured.
“L” changes to “*”, then “R” starts flashing.
NOTE
• If measurement is erroneous, “L” changes
to “E (Error)” and then “NEXT→ ”
appears. In such a case, repeat
measurement by pressing the start button.
If “E” remains after repeating
measurement, press to proceed to the
“R” side.
7. Instruct the patient to look at the red light
on the right hand side and repeat steps 4 - 6
for the sagittal radius of the left side of the
eye.
8. Perform measurement of the “D” (Down)
and “U” (Up) sides in the same manner.
When all four measurements for a single eye
are completed, an eccentricity value (E=) will
appear and the mode will return to the R/K
mode.
NOTE
• Median values of each side (L, R, U and D) are individually obtained by the serial
measurement, and the eccentricity data will be obtained by calculation on the basis of
the median values for the 4 sides and KM measurement (either the median values or
latest values). When the “Sagit Axis” parameter is set to “AXIS”, these values will be
converted for the angle of the steepest meridian which has been obtained by KM
measurement.
• Concerning the side at which “E” is indicated, the value of the opposite side on the
same meridian will be used for the calculation of eccentricity.
• If the eccentricity is indicated as “E = Err”, press to repeat measurement. Repeating
measurement, however, clears the former data.
4 - 25
9. Repeat the same procedure for the right eye.
It is possible to start binocular sagittal radius measurement after KM measurement of both eyes
have been completed.
10. Press
to print sagittal radius measurement.
NOTE
• If KM measurement is performed once again without pressing
after sagittal radius
measurement, the eccentricity data will be recalculated according to the new KM median
value, which is based on the stored former data and the newly measured data. When
measuring an additional patient, be sure to press the print button beforehand to print
and clear data.
* The following are sample printouts for the left eye and explanations of each item of data.
< Sample printout 1 >
* This is the printout for when the “Sagit Print” parameter is set to “Short”.
4 - 26
< Sample printout 2 >
* This is the printout for when “Sagit Print” parameter is set to “All”.
< SAGITTAL > = Sagittal radius of each side
SUP. = Superior side
INF. = Inferior side
TEM. = Temporal side
NAS. = Nasal side
A = Axis of the steepest meridian (of KM measurement)
(F = Fixation Angle)
S = Sagittal data obtained by adding the dRo value
to or subtracting it from the sagittal radius values
e = Eccentricity values of each sagittal radius
eh = Eccentricity on the horizontal meridian
ev = Eccentricity on the vertical meridian
E = Total Eccentricity
ASTc = Corneal cylinder at the center
ASTp = Corneal cylinder at the periphery
Rh = Average of corneal curvature on the vertical
meridian
Rv = Average of corneal curvature on the vertical
meridian
Ro = Average of corneal curvature at the center
dRo = Difference of corneal curvature between R1
and R2
dAST = Difference of corneal cylinder between the
center and the periphery
§5
PRINTOUT
5.1 Printing Measured Data
Measured data will be printed out by pressing
after measurement.
NOTE
• When the “Print” parameter is set to “Auto.”, printout will start automatically as soon
as both eyes have been measured (FINISH).
• Do not touch the printer paper while measured data is printed out. A loss of text and
lightly printed text may result.
• The memory indicator will be illuminated while measured data is being stored in the
memory. As long as the indicator is illuminated, data can be printed any number of times.
• After printout, the existing data will automatically be cleared when the next
measurement has begun. If the “Print & CLR” parameter is set to “YES”, data will
automatically be cleared just after printout.
down for approximately two
• When the memory indicator is illuminated, holding
seconds clears the existing data completely.
• When the memory indicator is not illuminated,
serves to feed the paper.
<Sample Printout 1>
Memory Indicator
NOTE
• This sample shows the printout performed on the condition that the parameters related
to printout have not been changed since shipment (factory-settings).
5-2
< Sample Printout 2 >
Description of printed contents
Patient number
Space for name and sex
Date and time of measurement
Vertex distance*1
Near working distance*2
AR measurement, Confidence index*3
S = Spherical powers, C = Cylindrical powers, A = Cylinder Axis
AR median values*4
SE value*5
Eyeprint*6
Trial lens data*7
CL conversion values*8
KM measurement
R1 = Flattest meridian, R2 = Steepest meridian
AVE = Average of R1 and R2
CYL = Corneal cylindrical power
deg = Corneal cylinder axis
KM median values*9
CS measurement,
PS measurement (ON or OFF of the lamp during PS measurement)
Measurable range over error*10
Pupil distance: Distance PD, (Monocular PD), Near PD*11
Comment*12
NOTE
• Whether or not to include the data with in the above printout “Sample Printout 2”
can be set by the parameters No. 24 to 37.
5-3
*1 < Vertex distance >
The distance between the corneal vertex to the posterior surface of a spectacle lens.
*2 < Near working distance >
Used for near PD calculation. Changeable in the 35 to 70 cm range by the corresponding
parameter.
*3 < Confidence index >
One of six steps (9, 8, 7, 6, 5, or E) will be printed out. “E” stands for erroneous data. For
information, if the “IOL (*) Mark” parameter is set to “YES” and AR measurement was
performed on the condition that
is turned ON, measured data on printout will be marked
with “*” just before the confidence index.
*4 < AR median values >
Printed out when three or more AR measurements (except for errors) are in the memory.
*5 < SE (Spherical Equivalent) value >
Calculated for the median values (or the latest values when the median values have not been
obtained) and CL conversion value.
*6 < Eyeprint >
Tells graphically the patient’s refractive status based on the median value. The eyeprint has 8
patterns.
• Emmetropia
• Astigmatism
• Simple myopic astigmatism
• Myopia
• Myopic astigmatism
• Simple hyperopic astigmatism
• Hyperopia
• Hyperopic astigmatism
5-4
*7 < Trial lens data >
Based on the AR median values, the cylinder reading direction is automatically converted so
that a spherical trial lens will have lower power as reference data.
*8 < CL conversion values >
The AR median values are converted into CL values, letting the vertex distance (VD) be 0
mm.
*9 < KM median values >
Printed out when three or more KM measurements (except for errors) are in the memory.
*10 < Measurable range over error >
Err +o .................. The spherical power is over the measurable limit of the + side.
Err –o................... The spherical power is over the measurable limit of the – side.
Err co ................... The cylindrical power is over the measurable limit.
When the “Error Code” parameter is set to “YES”, the error code will be printed out as soon as
an error occurs.
*11 < Near PD >
PD for a near working distance of 35 cm (factory-setting). Use it for prescriptions of reading
glasses or bifocals.
*12 < Comment >
It is possible to enter desired letters or symbols on the printout. For the procedure of entering
comments, see “6.3 Entering Comments”.
5.2 Eyeprint
Aside from normal printouts,
serves to print
the eyeprint and PD value only based on the
median values or latest values. The eyeprint will
be printed out regardless of the parameter
settings. It will help you to explain to the patient
the refractive condition of his or her eyes. The
Eyeprint has 8 patterns, the same as those on the
normal printout described in “5.1 Printing
Measured Data”.
§6
VARIOUS SETTINGS
6.1 Setting Parameters
The ARK-730A is equipped with a function to change parameters of various instrument conditions
according to the operator’s needs. The method of changing and confirming each parameter
setting is described as follows.
.
1. Press
The TV monitor shows “PARAMETER SET << 1/6 >>”, and the display panel shows the
setting and the parameter number.
Setting
Parameter No.
2. Establish the parameter setting mode which contains the desired parameter, referring to
the parameter tables on pages 6-4 to 6-9.
For each pressing of
, the setting mode changes in the order shown below.
Parameter setting mode 1 (Parameter No. 1 to 10) → Mode 2 (Parameter No. 11 to 17) → Mode
3 (Parameter No. 21 to 30) → Mode 4 (Parameter No. 31 to 38) → Mode 5 (Parameter No. 41
to 48) → Mode 6 (Parameter No. 51 to 58) →Date & Time setting mode → Parameter setting
mode 1 → ... .
6-2
3. In the selected mode, press
.
The parameter settings in each mode will be printed as follows.
No.
Parameter name Setting
6-3
4. Make the desired parameter number appear on the display panel.
For each pressing of the start button, the parameter number increases.
NOTE
• Pressing the start button on the condition that the last number of the selected mode is
shown makes the first parameter number of that mode appear again.
5. Change the setting by pressing
or
.
NOTE
• Refer to the parameter tables on the next page for the setting contents.
An underlined setting option indicates the factory setting. (Factory-settings may
vary with destinations.)
6. To finish setting ⇒ Press
.
To activate the date and time setting mode ⇒ Press
.
To change another parameter setting ⇒ Go back to step 2.
NOTE
• The parameter settings will be maintained in memory due to an internal battery*1 even
though the power switch is turned OFF.
*1 The battery is rechargeable. When you are operating the instrument for the first time after
unpacking or when the instrument has not been operated for a long time (approximately one
month or longer), the clock may reset to zero, and the system parameters and comment settings
may return to their factory settings. In such a case, turn on the instrument and leave it “ON” to
recharge the battery. The battery needs 24 hours for a full charge. If you are using the instrument
8 hours a day, you will have to keep the instrument on for three days before the battery is fully
charged. Once the battery is fully charged, the instrument operates normally for daily use.
A rechargeable lithium battery is used in the instrument. When disposing of the battery-mounted
circuit board, follow local governing ordinances and recycling plans regarding disposal or
recycling of lithium batteries.
6-4
Parameter Tables
< Setting Mode 1 >
No.
Parameter name
1
2
Step
Vertex D.
3
4
5
6
7
8
9
10
Axis Step
Meas. Mode
AI Mode
Tracking SW
Compare SW
Compare (AR)
ADD. SW
ADD. Sel.
Setting option
0.01D / 0.12D /0.25D
0 mm / 10.5 mm /12 mm
13.75 mm / 15 mm / 16.5 mm
1º / 5º
Con. / Nor.
YES / NO
S&T/M / S&T/T/M / T/M
Auto / Manu. / NO
SE / –SPH
YES / NO
1.50D / 1.75D / 2.00D
[No. 1] The indication step of SPH and CYL data for AR measurement.
[No. 2] The distance between the corneal vertex to the posterior surface of spectacle lenses when
the patient wears them.
* “13.75 mm” for the default of instruments destined for NIDEK INCORPORATED.
[No. 3] The indication step of AXIS data for AR measurement.
[No. 4] The way of fogging for AR serial measurement.
Con. (High-speed mode): The fog is maintained on throughout the serial measurement.
This mode is useful for children who do not fixate their eyes
very long.
Nor.: The fog will be released for each measurement even though the start button is
held down. This mode is useful for patients who accommodate their eyes easily.
[No. 5] Selection of whether or not to use the AI mode.
When the parameter is set to “YES”, the serial measurement is completed when the median
values are obtained. But if “Error Data” of the parameter is set to “YES” and there are not any
variations in the three measurements, theAR measurement ends. If there is an error data (confidence
coefficient=E) in the measurements, the AR selected value is not obtained.
[No. 6] Setting of how to switch the auto-tracking and auto-shot functions to ON or OFF when
is pressed.
S&T / M: Every time
is pressed, both the auto-tracking and auto-shot functions are
switched to ON or OFF.
S&T/ T/ M: Every time
is pressed, these functions are switched as: Both the autotracking and auto-shot functions are turned ON → Only the auto-tracking
function is turned ON. → Both the auto-tracking and auto-shot functions
are turned OFF.
T/ M: Every time
is pressed, only the auto-tracking function is turned ON or both
the auto-tracking and auto-shot functions are turned OFF. With this setting, only
the auto-shot function is not activated.
[No. 7] Setting of how to enter the View Comparison function screen.
Auto: The View Comparison function screen will automatically be shown when one
eye has been measured.
Manu.: The View Comparison function screen will be shown when
is pressed.
NO: The View Comparison function screen is not shown.
[No. 8] Setting of the SPH value (spherical power) to be used for the viewing condition of AR
measurement during the View Comparison function.
SE:
The spherical power of the SE value (Spherical Equivalent) will be used.
–SPH: The highest power (spherical power + cylindrical power) will be added.
6-5
[No. 9] Setting of whether or not to add addition power by pressing the start button during the View
Comparison function for near vision.
[No. 10] Setting of the addition power to be added during the View Comparison function for near vision.
< Setting Mode 2 >
No.
11
12
13
14
15
16
17
18
19
20
Parameter name
KM Unit
KM Display
Ref. Index
KM Continue
Sagittal
Sagit Axis
Sagit Print
Setting option
mm / D
R1, R2 / AVE, CYL
1.3320 / 1.3360 / 1.3375
1 to 10 (3)
YES / NO
Axis / FIX
All / Short
[No. 11] Selection of whether or not to indicate the corneal curvature with radius (mm) or refractive
power (D).
* “D” for the default of instruments destined for NIDEK INCORPORATED.
[No. 12] Selects the KM measurement indication between R1 (flattest meridian) & R2 (steepest
meridian), and AVE (average of R1 and R2) & CYL (corneal cylinder axis).
[No. 13] Selection of the corneal refractive index.
[No. 14] Setting of the number of serial measurements for KM measurement in the R/K or K mode.
[No. 15] Selection of whether or not to measure sagittal radius after KM measurement in the R/K or
R mode.
[No. 16] Selection of whether or not to convert the sagittal radius measurement for the axis of the
steepest meridian which has been obtained by KM measurement. To convert data, choose
AXIS.
[No. 17] Selection of the print format of sagittal radius measurement.
All: All data is printed out (See page 4-26).
Short: Only sagittal radius values and the total eccentricity are printed out (See page 4-25).
6-6
< Setting Mode 3 >
No.
21
22
23
24
25
26
27
28
29
30
Parameter name
Print
Econo. Print
Print & CLR
Patient No.
Patient No.
Name Print
Date Format
Eye Print
AR Print
KM Print
Setting option
Manu. / Auto / NO
YES / NO
YES / NO
YES / NO
0001 to 9999
YES / NO
Y.M.D / M.D.Y / D.M.Y / NO
YES / NO
All / Short
All / Short / All (KM)
[No. 21] Setting of how to start printing, or not to print.
Manu.: Data can be printed out by pressing
.
Auto: Data will be printed out automatically after both eyes have been measured.
NO:
Data will not be printed out.
[No. 22] Selection of whether or not to use the economical print function.
When set to “YES”, the printout will come out with narrow line-spacing so that the
printer roll can be saved.
[No. 23] Selection of whether or not to erase measured data in the memory just after printing it.
When set to “NO”, measured data will be erased after printout and when the next
measurement is begun.
[No. 24] Selection of whether or not to print patient number.
[No. 25] Setting of patient number to be printed out.
⇒ The patient number increases.
[No. 26]
[No. 27]
[No. 28]
[No. 29]
[No. 30]
⇒ The patient number decreases. (
works as a reset button. If the button is
pressed at first, the value resets to “0001”.)
Selection of whether or not to provide spaces for writing the patient’s name and sex on
the printout.
Format of the date on the printout. (e.g.: In the case of 4 o’clock PM on December 20,
2002)
Y.M.D = Year, Month, Day (e.g.: 2002. 12. 20 4:00 PM)
M.D.Y = Month, Day, Year (e.g.: DEC/20/2002 4:00 PM)
D.M.Y = Day, Month, Year (e.g.: 20/DEC/2002 4:00 PM)
NO = Date and time will not be printed.
Selection of whether or not to print Eyeprint.
The print format of AR measurement.
All: All data and median values are printed out.
Short: Only the median values are printed out.
The print format of KM measurement.
All:
All data and median values are printed out.
Short:
Only the median values are printed out.
All (KM): When the K mode is selected for the measurement mode, all data and median
values are printed out. When another mode is selected, only the median values
are printed out.
6-7
< Setting Mode 4 >
No.
31
32
33
34
35
36
37
38
39
40
Parameter name
SE Print
TL Print
CL Print
Conf. Index
IOL(*)Mark
Near PD
Error Print
ID Print
Setting option
YES / NO
YES / NO
YES / NO
YES / NO
YES / NO
YES / NO
YES / NO
YES / NO
[No. 31] Selection of whether or not to print SE values for the median values (or the latest values
when the median values have not been obtained).
[No. 32] Selection of whether or not to print trial lens data which is based on the median values.
[No. 33] Selection of whether or not to print CL conversion values which are based on the median
values, and SE values of the CL conversion values.
[No. 34] Selection of whether or not to print the confidence index.
[No. 35] Selection of whether or not to print “*” just before the confidence index indicating that
the data was measured in the IOL mode.
[No. 36] Selection of whether or not to print Near PD data.
[No. 37] Selection of whether or not to print error occurrences during AR measurement.
[No. 38] Selection of whether or not to print the patient ID. The patient ID should be scanned by
the optional barcode scanner. This parameter is only available for products marketed in
Japan.
6-8
< Setting Mode 5 >
No.
41
42
43
44
45
46
47
48
49
50
Parameter name
Window check
Auto IOL
Auto PD
Working D.
TV Auto-OFF
Beep
Error Code
Error Data
Setting option
YES / NO / DAY
YES / NO
YES / NO
35 to 70 cm / 14 to 28 inch
5 min / 10 min / 15 min / NO
High / Low / NO
YES / NO
YES / NO
[No. 41] Selection of whether or not to automatically check the measuring window for soiling (p.
10-6).
NO: The measuring window will not be checked.
YES: The measuring window will be checked at every startup.
DAY: The measuring window will be checked at the first startup of the day.
[No. 42] Selection of whether or not to use the Auto IOL function.
When set to “YES”, the IOL mode ( ) automatically turns on after three erroneous
measurements in a row.
[No. 43] Selection of whether or not to measure PD during AR measurement. (Applies only when
both eyes are measured.)
[No. 44] Setting of the near working distance, which is referred at near PD calculation, from 35 to 70 cm
(5 cm increments). After this, there is an option for the indication in inches from 14 to 28 inches
(2 inch increments). The setting is also in effect as the near working distance during the View
Comparison function.
* “14” inches for the default of instruments destined for NIDEK INCORPORATED.
[No. 45] Selection of whether or not to use the Auto-OFF function and the time of no operation
after which the TV monitor is shut OFF.
Auto-OFF mode: The TV monitor turns off automatically when there is no operation for
more than the set time period and the display panel shows the time.
The monitor ON condition recovers by pressing any button.
[No. 46] Selection of the tone of the beeps which is emitted during measurement.
[No. 47] Selection of whether or not to display and print error codes occurred during AR
measurement.
[No. 48] Selection of whether or not to display and print erroneous data obtained during AR
measurement.
(When set to “YES”, “Err” appears once after erroneous measurement and then the data
flashing show that it is erroneous data.)
6-9
< Setting Mode 6 >
No.
51
52
53
54
55
56
57
58
59
60
Parameter name
I/F Mode
I/F Format
Baud-Rate
Bit Length
CR Code
IN Port Sel.
LM Data Prt.
EyeCareC (LM)
Setting option
NIDEK / NCP10
All / Short
9600 / 4800 / 2400 / 1200
7/8
YES / NO
LM
YES / NO
NO
[No. 51] Setting of the instrument to communicate with.
NIDEK: Communicating with a NIDEK-brand instrument
(Set the parameter to “NIDEK”.)
[No. 52] The format of sending data. Selectable between “All”, which sends out all the measured
data, and “Short”, which sends out only the restricted data.
[No. 53] Selection of baud-rate (bit transmission speed) for communication.
[No. 54] The bit number for a single character used for communication.
[No. 55] Selection of whether or not to attach CR (carriage return) code at the end of data to be
sent.
[No. 56] Setting related to the instrument to be connected to the
interface connector. Never
change the setting from “LM”.
[No. 57] Selection of whether or not to print the data measured by the lensmeter connected to the
interface
connector by the printer built into the AR.
When the parameter is set to “YES”, the printout of the data will come out from the
printer built into the ARK-730A by pressing the print button of the lensmeter. Use a
lensmeter provided with the function for printing out data. For details, refer to the
Lensmeter Operator’s Manual.
[No. 58] Never change the setting from “NO”.
6 - 10
6.2 Setting Date and Time
1. Press
.
2. Press
six times so that the date and time setting mode is established.
The TV monitor shows “CLOCK SET” while the display panel shows the date with “year”
flashing. The flashing number indicates that the number is changeable.
Year
Month
Day
Hour
Minute
AM/PM
3. Press the start button to select the position that you want to change.
The selection order is as follows.
Year → Month → Day → Hour → Minute → Year →……
or
to change the setting.
4. Press
........................ The number increases.
........................ The number decreases.
5. Repeat steps 3 and 4 to set date and time.
6. After setting the desired parameters, press
to exit the date and time setting mode.
Pressing
instead of
returns the mode to the parameter setting mode 1.
NOTE
• The internal clock will continue to work due to an internal battery even though the
instrument is turned OFF. If the date and time setting becomes incorrect, recharge the
battery. (See “*1” on page 6-3.)
6 - 11
6.3 Entering Comments
1. Turn OFF the power switch.
down, turn ON the power switch.
2. While holding
The following will be printed out.
< Sample Printout >
Parameters
Parameters
for servicing
Parameters
for servicing
Date and time
Comment
Model name
6 - 12
3. Press
seven times to establish the mode for entering comments.
The TV monitor shows “COMMENT SET” while the display panel shows the following.
Character code
Line No. Figure No.
NOTE
• It is possible to input up to 24 × 2 characters.
Figure No. 1
Line No.
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
1
2
4. Make the desired figure number and the desired line number appear on the display panel.
When the start button is pressed, the figure number increases. When the start button is pressed
after figure number 24 is displayed, the line number changes.
5. Press
or
to change the character code to the desired one.
........................................... The character code increases.
........................................... The character code decreases.
For the character code, refer to the table on the next page.
6 - 13
Character Code Table
The following characters (symbols) are available to input.
Ten place of character code
2
SPC
!
“
#
$
%
&
‘
(
)
∗
+
,
.
/
One place of character code
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
3
0
1
2
3
4
5
6
7
8
9
:
;
<
=
>
?
4
@
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
5
P
Q
R
S
T
U
V
W
X
Y
Z
[
¥
]
Ç
È
6
‘
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
7
P
Q
R
S
T
U
V
W
X
Y
Z
[
{
}
Æ
の
8
J
9
―
ア
イ
ウ
エ
オ
カ
キ
ク
ケ
コ
サ
シ
ス
セ
ソ
。
「
」
、
・
ヲ
ァ
ィ
ゥ
ェ
ォ
ャ
ユ
ョ
ッ
A
タ
チ
ツ
テ
ト
ナ
二
ヌ
ネ
ノ
ハ
ヒ
フ
へ
ホ
マ
b
ミ
ム
メ
モ
ヤ
ユ
ヨ
ラ
リ
ル
レ
ロ
ワ
ン
゛
°
< Example >
1
2
1
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
N
I
D E K
A R K
-
7
3
0
A
2
• If you want to input the letter “N” in figure number 10 of line number 1, display “4E 1-7” on
the panel.
6. Repeat steps 4 and 5 to enter a desired comment.
7. After entering the comment, press
to exit the setting mode.
Pressing
instead of
returns the mode to the parameter setting mode 1.
NOTE
• The set comment will be kept in the memory due to an internal battery even though the
power switch is turned OFF. If the setting returns to the factory setting, recharge the
battery. (See “*1” on page 6-3.)
6 - 14
6.4 Measuring Hard Contact Lenses
1. Fix the mount for the optional CL holder
onto the upper end of the headrest post and
fix it with the fixing screw.
2. Fill the concave top of the CL holder with
water.
3. Put a contact lens in the water with the
surface to be measured facing upward.
When measuring the concave surface, place the
lens with the concave surface up. When
measuring the convex surface, place the lens
the other way.
NOTE
• Be careful not to let bubbles get under the
lens or water or dust on the lens.
4. Insert the pin of the CL holder into the cavity
on the top of the mount and turn the holder
with the surface to be measured facing
toward the measuring window.
5. Select KM measurement mode and measure
the lens in the same manner as usual KM
measurement.
NOTE
• When measuring the convex surface of a contact lens, axis angle can be read directly.
When measuring the concave surface, however, the measured axis should be read
inversely.
• Soft contact lenses cannot be measured.
§7
TROUBLESHOOTING GUIDE
In the event that the instrument does not work correctly, correct the problem according to the
following table before contacting your authorized distributor.
Symptom
Suggestion
• The power cord may not be correctly connected.
Reconnect it securely.
The TV monitor and display panel • The power switch may not have been turn on. Check
the power switch.
do not turn on.
The TV monitor does not turn on
(not clear) even though
the power is on.
• The fuses may be blown. If so, replace with new ones.
(p. 8-4)
• The auto-off function may have been executed. Try to
recover the monitor ON condition by pressing any
button.
• The brightness may be darkly adjusted. Open the AUX.
button cover and adjust the brightness by turning the
brightness control.
• The auto-off function may have been executed. Try to
The screen disappears suddenly. recover the monitor ON condition by pressing any
button.
• The screen may not be horizontally or vertically locked.
The screen runs.
Adjust it with the H or V control. (p. 3-7)
• The locking knob may be fixing the main body.
Release the main body by turning the locking knob
which is beside the joystick.
The main body cannot be moved
laterally.
• The locking knob may be impeding the main body.
Release the main body by turning the locking knob
which is beside the joystick.
• Check the printer paper. If the paper has been used up,
set a new printer roll. (p. 8-1)
Printing cannot not be executed.
• The "Print" parameter may be set to "NO". Reset the
parameter setting.
7-2
Symptom
The printer does operate,
however, printed results cannot
be obtained.
Suggestion
• The printer roll may be set with the wrong side up.
Set it with the correct side up.
• The auto-tracking function or auto-shot function may not
have been turn on.
Press
to turn it on.
• Room illumination may be reflecting on the cornea.
Change the location and try measurement again.
• The auto-tracking function or auto-shot function may not
work on some eyes such as keratoconus or recentlyoperated cornea. In such cases, turn off the autoThe auto-tracking function or auto- tracking function and start measurement.
shot function does not work.
• The patient who has substantial ocular ataxia or who
cannot fixate his or her eyes, the auto-tracking function
may not work. In such cases, turn off the auto-tracking
function and start measurement.
• If the instrument is installed in the vicinity of a window
where the instrument is exposed to sunshine, light
interference may adversely affect these functions.
Change the installed position of the instrument and start
measurement again.
Date and time settings go out of
order or system parameters and
comment setting return to their
factory settings.
• The internal battery may be dead. Turn the power on
and leave it "ON" for 24 hours to recharge the battery.
When the power is turned on, the • The internal battery may be dead. Turn the power on
and leave it "ON" for 24 hours to recharge the battery.
following error appears:
Err a, d
The error message "Memory
failure on RAM, Clock Error" is
printed out.
"<PD ERR>" appears on the TV • Make sure that the PD measuring window is not blocked
(p. 4-2).
monitor.
7-3
Symptom
Suggestion
• The patient may have blinked during measurement.
Instruct the patient not to blink and try measurement
again.
• The eyelid or eyelashes may obstruct measurement.
Instruct the patient to open his or her eye wider. If the
patient cannot open wider, lift the patient's lid, paying
attention not to press against the eyeball.
A measurement error appears.
• The pupil may be too small for measurement. Have the
patient sit in a dark room for a while until the pupil
enlarges enough and try measurement again.
• An IOL-implanted eye or eye with a contact lens may be
measured. Turn
ON and try measurement again.
("IOL" will appear on the upper left of the monitor.)
• The data may exceed the measurable limit.
The message "Check measuring
window" is printed out on startup.
• Clean the measuring window. See "8.4 Cleaning the
Measuring Window".
• If the measuring window is not dirty, make sure that the
measuring window is not blocked on startup.
The following error appears on the • Check the printer paper. The paper may be used up or
display panel at power-up:
the printer lever may be incorrectly set. Push the lever
Err 7
down. (p. 8-1)
The following error appears on the • Check the connection of the interface cable.
display panel:
Err IF
The following error appears on the • Contact NIDEK or your authorized distributor.
display panel at power-up:
Err 1 - 4, 9, b, c
• Contact NIDEK or your authorized distributor.
The error message "Memory
failure on E2PROM, PC22 Error"
is printed out.
* If the problem cannot be solved by following the suggestions above, contact NIDEK or your
authorized distributor.
§8
MAINTENANCE
8.1 Replacing Printer Roll
When a red line appears on the side of the printer paper, it means that the paper is running short.
In such a case, stop using the printer and replace the roll with a new one.
NOTE
• Replace the printer paper with the power switch turned off.
• Do not run the printer without paper.
It ruins the printer head.
• Do not pull the paper in the printer forcefully. This may cause malfunction of the
printer.
1. Pull the printer cover to open.
2. Raise the lever on the right and turn the gear
backward in order to feed the paper out.
Lever
Gear
3. Take out the used paper roll and remove the
shaft out of the roll.
8-2
4. Insert the shaft in the new printer roll.
5. Cut the end neatly with scissors and pass the paper through the printer housing as shown
in the figure on the right.
NOTE
• If the roll is set in such a way that the
paper becomes upside down, it is not
possible to print data on the paper.
• When the paper comes to point “ ”, turn
the gear forward to feed the paper.
Gear
6. Set the printer paper into the printer.
NOTE
• To remove the slack of paper, turn the gear
forward.
7. Push down the lever on the right.
8. Pass the paper through the printer cover.
9. Push the printer cover toward the main body
Lever
8-3
8.2 Fixing a Stack of Chin Rest Paper
1. Disconnect the two fixing pins from the chin rest.
2. Take out a proper number of chin rest papers from a pack.
It is impossible to fix a whole stack of chin rest paper. Be sure to fix a stack with a thickness of
6 mm. Pay attention not to scatter the chin rest papers.
3. Insert the fixing pins into the holes in the
chin rest paper.
Insert the disconnected pins into both holes of
the stack of paper.
Fixing pin
Stack of chinrest paper
4. Fix the stack of chin rest paper onto the chin
rest.
1) Insert the pins into the holes in the chin rest
while holding both fixing pins and stack of
paper.
2) Push the pins into the holes of the chin rest
with the other hand.
8-4
8.3 Replacing Fuses
If the instrument does not work even though the power switch is ON, fuses may be burnt out. In
such a case, replace them.
CAUTION
• Replace fuses in a stable and open space. If the instrument falls, it may cause instrument
malfunction or personnel injury.
• Never use a fuse other than the specified one.
This may cause fire.
AC 100 V, 120 V:
T2A 250 V
AC 200 - 220 V, 230 - 240 V:
T1A 250 V
1. Turn OFF the power and remove the power
cord.
2. Lock the main body to the base unit with
the locking knob and lay it down gently.
3. Turn the fuse holders counterclockwise as
indicated by an arrow with a screwdriver
and remove them.
4. Pull out the fuse holders from the base unit.
8-5
5. Remove the used fuses from the fuse holders
and insert new fuses into the fuse holders.
6. Turn the fuse holders clockwise while
pressing them down with the screwdriver
and set it into the main body.
CAUTION
• If fuses blow frequently, do not touch the inside of the instrument but contact NIDEK or your
authorized distributor.
If you touch the inside of the instrument, electric shock may result.
8-6
8.4 Cleaning the Measuring Window
When the measuring window gets fingerprints or dust on it, the reliability of the measured value will be
lowered substantially. Check the dirt on the measuring window before use, and then clean it if it is dirty.
1. Blow off the dust on the measuring window with a blower.
2. Wrap the lens cleaning paper around a thin
stick such as a chopstick (or cotton swab)
and wipe the glass of the measuring window
with a material moistened with alcohol.
Use a thin stick which will not damage the glass.
(Never use hard objects such as a metal
product.)
Wipe the measuring window lightly from center
to outside along an arc.
Pay attention not to put alcohol onto the sensor
window and cover, etc. except the measuring
window.
Wrap a piece of cleaning paper around the tip.
Measuring Window
3. Check if the window is cleaned using a
penlight. If not, clean it again with a new
cleaning paper.
Apply light with a penlight and change the view
angle to check the dirt clearly.
NOTE
• If the “Window check” parameter is set to “YES” or “DAY”, the measuring window will be
checked whether it is clean at the time of startup.
“YES” ⇒ Check every startup
“DAY” ⇒ Check on the first startup of the day
When the message “Check measuring window.” is printed out, clean the measuring
window.
On startup, do not stand or put objects in front of the measuring window.
If something blocks the front of the measuring window within the range of 1 m, the
measuring window may not be checked correctly.
8-7
8.5 Cleaning the Exterior
When covers or panels become dirty, wipe with a dry and soft cloth. For stubborn dirt, immerse
the cloth in a neutral detergent, wring well, and wipe. Finally wipe with a dry and soft cloth.
NOTE
• Never use an organic solvent such as paint thinner.
It could ruin the surface of the instrument.
8.6 List of Replacement Parts
Printer roll
Order Number
Printer roll
8062-00001
Bunch of chin rest paper
32903-M047
Fuse (100/120V ~)
80402-02116
Fuse (200-220/230-240V ~)
80402-02113
§9
SPECIFICATIONS
9.1 Specifications
{ Measurement of refractive power (AR measurement)
• Spherical power (S)
Measurable range
Indication step
–20.00D - +23.00D (VD = 12 mm)
0.01D/0.12D/0.25D
• Cylindrical power (C)
Measurable range
Indication step
[Accuracy*1]
0D - ±12.00D
0.01D/0.12D/0.25D
Criterion
Measuring range
Spherical and 0.00 ±10.00D
cylindrical vertex
>10.00D (absolute)
powers
0.25D to 0.50D
Cylinder axis for
>0.50D to 3.00D
cylindrical power
>3.00D
• Cylinder axis (A)
Measurable range
Indication step
[Accuracy*1]
Criterion
Deviation from the
nominal value
±0.25D
±0.50D
±10°
±5°
±3°
0º - 180º
1º/ 5º
Measuring range
0.25 to 0.50D
Cylinder axis for
>0.50D to 3.00D
cylidrical power
>3.00D
Deviation from the
nominal value
±10°
±5°
±3°
*1 The accuracy specifications are based on the results of eye
model testing performed in accordance with ISO 10342:
1997, Ophthalmic Instruments–Eye Refractometers.
* Cylinder axis shall be indicated as specified in ISO 8429.
• Minimum pupil diameter measurable
φ 2.5 mm
• Vertex distance
• Indication step
0 mm/10.5 mm/12 mm/13.75 mm/15 mm/16.5 mm
Refractive powers
0.01D/ 0.12D/ 0.25D
Axis
1º/ 5º
Auto-fogging system
• Target fixation
9-2
{ Measurement of corneal curvature (KM measurement)
• Corneal curvature (R1, R2, AVE)
Measurable range
5.00 mm - 13.00 mm
Indication step
0.01 mm
Accuracy
±0.05 mm
• Corneal refractive
Measurable range
Indication step
Corneal refractive idex
25.96D - 67.50D (n=1.3375)
0.01D/ 0.12D/ 0.25D
n = 1.3375/ 1.336/ 1.332
• Corneal astigmatism (CYL)
Measurable range
Indication step
0D - ±12.00D
0.01D/ 0.12D/ 0.25D
• Corneal axis of astigmatism
Measurable range
Indication step
0º - 180º
1º/ 5º
• KM measurement range
φ 3.3 mm on cornea (For corneal curvature of 7.7 mm)
• Size of mire ring
φ 2 mm on cornea (For corneal curvature of 7.7 mm)
{ Measuring time
• AR measurement
• KM measurement
Less than 0.3 seconds/eye
Less than 0.1 seconds/eye
{ PD measurement
• Measurable range
• Indication step
30 mm - 85 mm
(Near PD: 28 mm - 79 mm, Near working distance= 35 cm)
1 mm
{ CS measurement
• Measurable range
• Indication step
10.0 mm - 14.0 mm
0.5 mm
{ PS measurement
• Measurable range
• Indication step
1.0 mm - 10.0 mm
0.5 mm
9- 3
{ Printout
•
•
•
•
•
•
•
•
•
•
•
•
•
Date and time of measurement, patient number
Vertex distance
Near working distance
AR measurement
10 stored data for each eye, right and left
Median value (when there are 3 or more measurements)
Latest value (when there are 2 or less measurements)
KM measurement
10 stored data for each eye, right and left
Median value (when there are 3 or more measurements)
Latest value (when there are 2 or less measurements)
PD measurement
Measured value of Distance PD
Calculated value of Near PD
(for near working distance between 35 cm - 70 cm, changeable
in increments of 5 cm)
CS measurement
PS measurement
CL conversion value
SE (Spherical Equivalent) value
Err (Measurable range over error)
Trial lens data
Eyeprint
{ Chart
• Scenery chart
1
{ Alignment observation
• 5 inch TV monitor
{ Measurement indication
• LED digital display
• TV monitor display
Refractive power measurement, PD measurement,
CS measurement, PS measurement,
Corrective power for the View Compare function
(SE value or –SPH value)
Corneal curvature measurement, Measurement count,
PD measurement, PS measurement, CS measurement
View Comparison data
9-4
{ Interface
• Interface which complies with the RS-232C standard
• Two types of connection of IN/OUT
IN: Connect a lensmeter to import data and then transfer the data to the RT-2100/RT-1200
if it is connected.
OUT:Connect the RT-2100/RT-1200 or ICS-100 (IC card system) and output all data which
can be printed out except for eyeprint.
{ Axis-alignment range
• Back and forth: 33 mm, right and left: 85 mm, up and down: 28 mm
Auto-tracking in XY direction, Auto-focusing in Z direction
{ Working range of auto-tracking
• φ 4 mm on cornea
{ Power source
• A.100/120 Vac
±10% 120 VA 50/60 Hz
B. 200 - 220/ 230 - 240 Vac ±10% 120 VA 50/60 Hz
{ Dimensions and weight
• 260 (W) × 485 (D) × 456 (H) mm 20.5 kg
{ Environmental conditions (In transport and storage)
• Temperature
• Humidity
–20ºC - 60ºC
10 - 95% (Non-condensing)
{ Environmental conditions (In use)
• Temperature
• Humidity
• Atmospheric pressure
10ºC - 35ºC
30 - 75% (Non-condensing)
800 - 1060 hpa
* Specifications are subject to change without notice for improvement.
9- 5
9.2 Accessories
9.2.1 Standard accessories
Fuses (Two of them are located in the body.)
Printer paper rolls (One of them is set in the body.)
Power cord
Dust cover
Pack of chin rest paper
Fixing pins
Operator’s manual
4
4
1
1
1
2
1
9.2.2 Optional accessories
Motorized stand
Interface cable
ICS-100 (IC card system)
CL holder set
1
1
1
1
APPENDIX A
GLOSSARY
• AI Mode
A mode in which the instrument completes AR measurement as soon as the median values are obtained. But if
“Error Data” of the parameter is set to “YES” and there are not any variations in the three measurements, the AR
measurement ends. If there is an error data (confidence coefficient=E) in the measurements, the AR selected
value is not obtained.
• AR Median Value, KM Median Value
The middle value of the measured values which are put in order in the computer when AR or KM measurement
is performed.
• Auto IOL
A function where the instrument automatically turns on the IOL mode after three times of erroneous measurement.
• Auto-off mode
A mode in which the TV monitor goes off automatically to save power when there is no operation for the
specified time.
Pressing any button recovers the TV ON condition.
• Auto-shot
A function where the instrument automatically starts serial measurement as soon as the instrument is best
aligned and in the best focus.
• Auto-tracking, Auto-focusing
A function where the instrument automatically controls the up, down, right, and left movements for alignment
and forward and backward movements for focusing. This function works in a range of 4 mm in diameter on the
cornea.
• Contact Lens (CL) conversion value
The AR median values (or the latest values when the median values have not been obtained) are converted into
CL values, letting the vertex distance (VD) be 0 mm.
• Comment
It is possible to enter some letters or marks as you wish on the printout. The instrument accepts up to 24 letters
× 2 lines as a comment.
• CS
Abbreviation of Corneal Size.
• Eyeprint
Tells graphically the patient’s refractive status based on the median values (or the latest values when the median
values have not been obtained).
• Fogging
Blurs the patient’s view so as not to achieve focus to eliminate accommodation.
A-2
• High-speed Mode
This mode enables the patient’s view to keep fogging during AR serial measurement.
• Limit Mark
Two arrows which appear in the center of the TV monitor when the position of the mire ring gets out of the
working range of the auto-tracking. “<LIMIT>” appears simultaneously.
• Measurable Range Over Error
Err + o .................... The spherical power is over the measurable limit of + side.
Err – o .................... The spherical power is over the measurable limit of – side.
Err co ...................... The cylindrical power is over the measurable limit.
• Min. Pupil Mark
Indicates the minimum pupil size measurable.
• Near PD
Prospective PD at near, which is calculated by preset near work distance of 35 cm (factory-setting).
• Near Working Distance
Distance between the eye and the watching target, when one sees the target through reading glasses or multifocal
glasses.
• PD
Abbreviation of Pupillary Distance.
• PS
Abbreviation of Pupil Size.
• SE (Spherical Equivalent) Value
The value that 1/2 of the cylinder value is added to the sphere value. Calculated for median values (or the latest
values when the median values have not been obtained) and CL conversion value.
• Trial Lens Data
Based on the AR median values (or the latest values when the median values have not been obtained), the
cylinder reading direction is automatically converted so that a spherical trial lens will have lower power as
reference data.
• Vertex Distance
The distance between the corneal vertex to the posterior surface of the spectacle lens.
INDEX
A
Addition power ......................................... 4-13
AI mode ...................................................... 4-9
Auto IOL ..................................................... 4-4
Auto-off mode ............................................ 4-1
Auto-PD measurement ............................. 4-21
Auto-shot OFF .......................................... 4-14
Auto-shot ON ............................................. 4-6
Auto-shot ON Mark .................................... 3-3
Auto-tracking OFF.................................... 4-14
Auto-tracking ON .............................. 4-6, 4-16
Auto-tracking ON Mark ............................. 3-3
Aux. button cover ................................ 3-1, 4-3
Auxiliary buttons ........................................ 3-5
Axis-alignment range ................................. 9-4
B
Brightness control ....................................... 3-5
C
Change button ............................................. 3-1
Character code table ................................. 6-13
Chart ........................................................... 9-3
Chart distance change button ...................... 3-1
Chin rest ...................................................... 3-7
Chin rest knob ............................................. 3-7
CL conversion value ................................... 5-3
Comment .................................................... 5-4
Confidence index ........................................ 5-3
Contrast control .......................................... 3-5
CYL + ......................................................... 4-3
CYL – ......................................................... 4-3
CYL ± ......................................................... 4-3
CYL mode change button ........................... 3-5
Cylinder mode indication ........................... 3-3
D
Dimensions and weight .............................. 9-4
Display panel .............................................. 3-1
E
Entering comments .................................... 6-11
Environmental conditions ........................... 9-4
Error data ........................................... 4-8, 4-15
Eye level marker ......................................... 3-7
Eyeprint................................................ 5-3, 5-4
Eyeprint button ........................................... 3-5
F
Flattest meridian .........................................
Focusing indicator ......................................
Forehead rest ...............................................
Fuses ...........................................................
Fixing a stack of chin rest paper .................
4-3
3-3
3-7
2-4
8-3
H
High-speed mode ........................................ 4-9
I
Interface ...................................................... 9-4
Interface connector ..................................... 3-7
IOL button ........................................... 3-1, 4-3
IOL ON Mark ............................................. 4-3
J
Joystick ....................................................... 3-1
K
K mode .............................................. 4-4, 4-11
L
LED for corneal illumination...................... 3-7
Limit Mark .................................................. 4-7
Locking knob ....................................... 2-1, 3-1
Index - 2
M
Manual PD measurement.......................... 4-21
Measurable range over error ....................... 5-4
Measurement indication ............................. 9-3
Measurement of corneal curvature ............. 9-2
Measurement of refractive power ............... 9-1
Measurement count..................................... 3-3
Measuring time ........................................... 9-2
Measuring window .............................. 2-3, 8-6
Median value ....................................... 5-3, 5-4
Memory indicator ................................ 3-1, 5-1
Min. Pupil Mark ......................... 3-3, 4-8, 4-15
Mire ring ..................................................... 3-3
T
Target ..........................................................
3D auto button ............................................
Trial lens data .............................................
Troubleshooting Guide ...............................
TV monitor .................................................
TV monitor H control .................................
TV monitor V control .................................
N
Near PD ...................................................... 5-4
Near working distance ....................... 4-12, 5-3
W
Working range of auto-tracking .................. 9-4
P
Parameter tables .......................................... 6-4
PD ERR ...................................................... 4-2
PD measurement ......................................... 9-2
PD window .......................................... 3-7, 4-2
Power inlet .................................................. 3-7
Power source............................................... 9-4
Power switch............................................... 3-1
Print button .......................................... 3-1, 5-1
Printer ......................................................... 3-1
Printout ................................................ 5-1, 9-3
PS measurement ......................................... 9-2
R
R mode ............................................... 4-4, 4-10
Replacing fuses ........................................... 8-4
Replacing printer roll .................................. 8-1
R/K mode ............................................. 4-4, 4-8
S
SE value ...................................................... 5-3
Setting date and time ................................ 6-10
Setting button .............................................. 3-5
Setting parameters ...................................... 6-1
Start button ................................................. 3-1
Steepest meridian ........................................ 4-3
3-3
3-1
5-4
7-1
3-1
3-7
3-7
V
Vertex distance ............................................ 5-3
View Comparison button ............................ 3-1
View Comparison function ......................... 4-8