With swept-source technology, an accurate reconstruction of the ocular
physiology is created in the device’s software.
BY TIM DONALD, CONSULTING EDITOR
T
he Argos Advanced Optical
Biometer (Movu; Figure 1) is a
noninvasive, noncontact device
designed to maximize the clinician’s ease of use by streamlining biometric acquisition and minimizing discomfort
for the patient. The Argos is not yet clinically available; however, according to the
manufacturer, it outperformed competitor devices in clinical trials.1 The Argos
consolidates the process of acquiring
biometric parameters with a high success
rate and accuracy, even in the densest of
cataracts. It provides precise ocular biometry for accurate selection of IOLs using
swept-source OCT.
With swept-source technology, a nearinfrared swept laser is scanned across the
patient’s eye. As light is detected returning from boundary layers, an accurate
reconstruction of the ocular physiology
(Images courtesy of Movu)
COVER FOCUS
ARGOS: STREAMLINING
BIOMETRIC ACQUISITION
Figure 1. The Argos Advanced Optical
Biometer is based on coherent optical
interferometry and tomography with lateral
scanning of a 1-µm swept-source beam.
is created in the device’s software. With
the use of fast image reconstruction algorithms, real-time 2-D imaging of the eye
is available during biometer alignment.
Image acquisition for biometric and keratometric measurement takes the Argos
less than 1 second, according to the
company, with the device capturing six
images in that span of time and generating three sets of results, calculating average and standard deviation values.
The Argos optical biometer is based
on coherent optical interferometry and
tomography with lateral scanning of a
1-µm swept-source beam. Keratometry
(K) values are generated by illumination
Figure 2. Dense cataract mode, analysis mode, summary, and IOL power calculation screens on the Argos.
58 CATARACT & REFRACTIVE SURGERY TODAY EUROPE | JULY/AUGUST 2015
from a ring of 16 infrared LEDs. Using the reflected image
from the LEDs in combination with the OCT signal, corneal
curvature data are generated. Parameters measured include
axial length (AL), central corneal thickness, anterior chamber
depth, lens thickness, K values, pupil size, and toric axis.
The device is operated through a Windows-based
graphical user interface. Tracking markers and a 2-D image
window guide the user to achieve alignment. A joystickmounted button is used to initiate data capture; after measurement, the technician can review the capture, assess the
validity of the measurement by referring to the 2-D image,
and perform fine tuning if necessary.
The sensitivity of the Argos is 10 times greater than that of
other partial coherence interferometry devices, according to
Movu; in Dense Cataract mode (Figure 2), it can increase sensitivity up to 100 times for AL detection, resulting in improved
success rates.1
Biometry values are output in ready-to-print format, and
unusual discrepancies between left and right eyes are flagged
with alerts. IOL power calculations are made with the surgeon’s choice of four IOL power formulas. Manufacturers’
data for IOLs can be uploaded from the User Group for
Laser Interference Biometry library. A desktop PC is required
as a peripheral device. n
1. Argos. Movu website. http://movu-inc.com/product/. Accessed June 15, 2015.