Canon CR-DGi
Digital-exclusive Non-Mydriatic Retinal Camera
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SwitchWhat are all those knobs for?
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-Focus
Setting Buttons and Monitor Adjustment
-Fixation Target
-Alignment
-Small Pupil
-Diopter Compensation
-Infrared Filter
-Shutter Release & Height Adjustment
-Stage HoldingConfidential only for Authorized
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Knobs and Switches (Right Side*)
(Refer to Canon’s CR-DGi Operation Manual Pages 4-5)
* Right Side is from the
Photographer’s perspective.
•The following knobs can be
found:
–Diopter Compensation
–Focus Knob
–Infrared Filter
–Small Pupil
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Focus Knob
(Refer to page 4 of the CR-DGi Operation Manual)
•The Focus Knob allows
you to focus on the
patient’s eye for
Anterior or Fundus
images.
•The Focus knob is
located on the right
andleft side of the CRDGi head.
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Small Pupil Knob
(Refer to page 12 of the Canon CR-DGi Operation Manual)
•The Small Pupil knob is
used for pupils that are
smaller than 4.0 mm
in size.
•Turned to the “ON”
position, pupils as
small as 3.7 mm can
be photographed.
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DiopterCompensation Slider
(Refer to page 15 of the CR-DGi
Operation Manual)
• •The DiopterCompensation
Slider is used when
photographing Anterior and
Posterior segments. There are
three settings for this filter.
• •0 (-12 to +15D)
• •-(-7 to -33D)
• •+ (+11 to +35D)
• •This is helpful for:
• –High Myopeiapatients
• –High Hyperopiapatients
• –Anterior Photography
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Infrared Filter
(Refer to page 26 of the Canon CRDGi Operation Manual)
•The “IN”position should be
set for photography.
•Verify the knob is not turned
counter clockwise (toward
the photographer) while
photographing.
•NOTE: The counter
clockwise position turns
the infrared filter off. This
is used for cleaning the
objective lens.
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Shutter Release and Height Adjustment
(Photographer Side of Camera)
•The Shutter Release button
activates the exposure,
capturing a single image by
the digital camera back.
•The Height Adjustment Ring
moves the CR-DGi head up
or down. Used when
aligning the camera to the
patient’s pupil.
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Stage Holding Knob
•The Stage Holding knob
locks the CR-DGi
stage in place.
Stage
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Setting Buttons and Monitor Adjustment
•The Setting buttons under
the monitor (along the
bezel) are for setting
functions such as, Flash
Intensity or setting up
specific tool features.
•The Monitor Adjustment
Cover hides the knobs
used to modify Horizontal
Hold, Vertical Hold,
Brightness, and Contrast.
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Fixation Target Control
•The Fixation Target Control moves
the fixation target.
•The fixation target appears as a
small square on the CRDGi’smonitor when viewing the
fundus.
•The patient will see the fixation
target as a green dot while they
look into the lens of the CR-DGi.
•Have the patient focus on the green
dot.
•Move the fixation target by pressing
down on the control and moving
the button up, down, left, or right
according to the “view”required
by the photography protocol.
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Alignment Switch
•Pressing the Alignment
Switch changes the
focus from the anterior
part of the eye to the
fundus, and back.
•Select Alignment
Switch as necessary
for the type of image
being photographed.
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Knobs and Switches (Left Side*)
(Refer to Canon’s CR-DGi Operation Manual Pages 4-5)
• Left Sideis from the
Photographer’s
perspective.
•The following knobs
can be found:
–Focus Knob
–Chin Rest Height
Adjustment Ring
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Patient Positioning and Photography
•Hand Positioning
•Patient Head Adjustment
•Aligning the Pupil (External)
•Identifying Laterality
•Aligning the Pupil (Internal)
•Establishing “View”based on protocol
•Flash Setting
•Focusing
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Hand Positioning
•Before photographing a patient,
remember to pull the stage back
towards you. Then have the patient
rest their chin on the chin rest and
press their forehead against the
head rest.
•Use your left hand to help guide the
stage, while your right hand
controls the movement of the stage
(via the joystick).
•Remember to move the stage towards
you, in a “U”movement (away
from the patient) to avoid the
camera coming in contact with the
patient when switching from left
eye to right eye.
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Patient Head Adjustment
(Refer to page 10 of the Canon CR-DGi Operation Manual)
•Before proceeding,
check the patient’s
head alignment.
• –Verify that the patient
has their chin firmly
resting on the chin rest.
• –Verify their forehead
is firmly against the
Head Rest.
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Patient Head Adjustment.
(Refer to page 10 of the Canon CR-DGi Operation Manual)
•Next, verify the patient's
Lateral Canthusis aligned
with the Height
Adjustment Mark (white
line) on the head rest
frame.
•To adjust the height, use the
chin rest Height
Adjustment Ring to raise
or lower the patient’s head
relative to the Height
Adjustment Mark.
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Aligning the Pupil
(Refer to page 11 of the Canon CR-DGi Operation Manual)
•Press the Alignment Switch if necessary
to view the anterior eye.
•The eye will appear “split”on the monitor.
•Move the joystick forward and backward
until the pupil is no longer “split.”
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Properly Aligned Pupil
•With the pupil no longer split,
three “dots”will appear over the
pupil.
•If the dots are not within the
boundary of the pupil, set the
small pupil knob to “ON”.
•Note: After activating the small
pupil adjustment, the three dots
still may not be contained
within the boundary of the pupil.
•Press the Alignment switch to
view the fundusand internal
fixation target .
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Split Bar Focusing
(Refer to page 14 and 15 of the CR-DGi Operation Manual)
• If the Split Bar
appears as two lines,
the image is out of
focus.
•Use the Focus Knob
(located on either side
of the camera) to bring
both lines into
alignment (single bar).
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Alignment: Distance Dots
(Refer to pages 14-15 of the CR-DGi Operation Manual)
•With a single Split Bar,
move the stage slowly
backward and forward to
bring the distance dots
into the field of view.
•If necessary, move the
camera’s head up or down
in order to position the
Distance Dots inside their
respective “notch”(located
along the right/left border).
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Distance Dots
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Identifying Laterality
•In the upper right corner of
the monitor you will
notice a “L”or
“R”character, these letters
represents the laterality of
the eye you are imaging.
•Sliding the stage left or right
will automatically change
this character.
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Capturing a specific “View” based on protocol
•Photography protocols define specific
“views”of the retina.•Views are
defined by the relative position of
the macula, optic nerve,
etc.•Positioning the fixation target
in a specific location will result in a
specific “view”, as defined in the
photography protocol.
• The fixation target appears as a small square onthe CR-DGi’smonitor.•The
patient will see the fixation target as a green dot. •Have the patient focus
on the green dot.•Move the fixation target (press down while moving)
according to the “view”required by the photography protocol.
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Flash Setting
(Refer to page 8 of the CR-DGi
Operation Manual)
•The flash setting is located along
the lower right border of the
monitor.
•If the patient has light
pigmentation*, set the flash to a
low value.
•If the patient has darker
pigmentation set the flash to a
higher value.
•F0 -is the lowest flash setting
•F-14 is the highest flash setting.
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–
* Note: If the patient happens to be an albino, make sure the flash setting is set
to it’s lowest setting.
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Changing the Flash Setting
• •There are two buttons
along the lower right bezel
of the monitor.
• •The two buttons are used
to adjust the flash settings.
• •“-”will lower the flash
setting.
• •“+”will increase the flash
setting.
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Button
Button
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Ready for Exposure
(Refer to page 15 of the CR-DGi
Operation Manual)
Before pressing the exposure button on
the joystick
• –Are the distance dots in their
respective notches?
• –Is the split bar a single line?
• –Is the fixation target located
properly?
• –Is the flash setting properly set?
• •TIPS:
• –To view and align the distance
dots, move the CR-DGi stage unit
slowly. Move camera up or down,
left or right as necessary
• –If only one distance dot appears
on the monitor, move the stage
away from the visible dot.
• –Use the focus knob to get a single
split bar.
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How to Correct for a Halo or a Flare
The following steps should be
taken in order to correct for
halo’s or flares;•
• For Image #1: move the stage
forward and backwards.
• For Image #2: move the stage
forward and backwards,
lower the chin rest or camera
head.
• For Image #3: move the stage
to the right.
• For Image #4: lower the chin
rest or the camera head.
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Anterior / External Photos
•Positioning of the Head
•DiopterCompensation
•Small Pupil Setting
•Alignment Switch
•Focus
•Exposure
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External / Anterior Imaging
•Have the patient rest
their chin against the
chin rest.
• –Verify that their
forehead is not
touching the head rest.
• •The proper distance
away from the
forehead rest is about
½inch.
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Not
Touching
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Diopter Compensation Slider
(Anterior Imaging)
•Pull the DiopterSlider to
the (+) positio
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Small Pupil Switch
(Anterior Imaging)
•Set the Small Pupil
knob to the
“On”position.
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Alignment Switch (Anterior Imaging)
•Press the Alignment
switch on the CR-DGi
Stage in order to see
the anterior part of the
eye.
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Focus and Exposure
•Using a Focus Knob,
focus the patient’s eye.
•Adjust the flash setting
to the desired setting.
•Press the shutter release
button on the joystick.
•This will capture an
anterior photo.
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Stereo Photography
•Getting Started
•Capturing First Image
•Capturing Second Image
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Getting Started
•Position the patient as you normally would.
•Turn the Small Pupil Switch to “ON”.
•Press the Alignment Switch in order to see
the fundus.
•Set the flash of the CR-DGi to the desired
setting.
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•Position the Fixation Target
slightly to the left of the Split
Line Bar.
–You may need to reposition the
Fixation Target until the optic
disc*is directly behind the Split
Bar.
•Move the Stage until the right
Distance Dot is directly inline
with the Split Bar.
–You should not see the left
Distance Dot on the monitor.
•Focus as needed.
•Press the exposure button.
Distance Dot off screen --
First Image of Stereo Pair
Simulation
* This assumes the stereo pair of
images are for the optic disc
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•DO NOT MOVE
FIXATION TARGET
•Move the Stage until the
left Distance Dot is
directly inline with the
Split Bar.
–You should not see the
right Distance Dot on the
monitor.
•Focus as needed.
•Press the exposure button.
Distance Dot off screen --
Second Image of Stereo Pair
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Simulation
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Sales points-1
1. True Digital Quality produced by digitally
optimized optics
2. By combining Canon’s renowned digital
SLR, CR-DGi provides the refined digital
imaging.
The latest model is EOS 30D Digital featuring
8.2 Megapixels CMOS Sensor and DIGIC II
Image Processor.
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Sales points-2
3. Inheriting the User-friendly operations like Split-lines
focusing and Working Distance dots based on 25 years of
expertise as the very first manufacturer of Non-mydriatic
Retinal Camera – Canon invented the very first nonmydriatic retinal camera in 1976.
4. Needs only a small amount of light to capture clear
images, so that the CR-DGi can take Right and Left eyes
almost immediately, which is very handy for a mass-scale
screening to handle dozens of people in a short time.
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Sales points-3
5. Thanks to CR-DGi’s user-friendly functions (as
stated before), there is no need to hire a dedicated
ophthalmic photographer. In principle, anyone can
be trained to handle CR-DGi to take the best shot
resulting in reduction of running cost.
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