Optos P200TE, User Manual

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Chapter 2 - Introduction
Note
The device also includes a user guide, power cable and Cat 6 cable not shown on this diagram.
A table may also be supplied.
2.6.2 Image modalities
Optos multi-modal ultra-widefield retinal imaging enables the capture of posterior images, with a field of view of
up to 200 degrees in a single capture, and in an imaging time of less than 0.4 seconds.
Depending on the configuration of your device the following image modalities may be available:
2.6.2.1 SLO imaging modalities
opto map
opto
map is an ultra-widefield (
UWF
1
) color fundus image.
opto
map combines neurosensory retinal and choroidal reflectance images and provides UWF image views from
a single capture action:
l
opto map color view – an UWF color fundus image combining red and green reflectance images.
l
opto map neurosensory retinal view – an UWF green laser reflectance image of the surface retina.
l
opto
map choroidal view – an UWF red laser reflectance image of the deeper retina.
opto map af
opto map af is an UWF green laser auto fluorescence image.
opto map plus
l
opto map plus is a higher resolution option which is available for opto map color reflectance and
opto
map
af
modalities.
l
opto map
plus
is captured at resolution x1.5 that of the standard resolution opto map.
2.6.2.2 OCT imaging modalities
CAUTION
OCT scans are described using nominal 'mm' dimensions. These dimensions are based
on an external angle scale factor of 3.47 as derived from the wide-angle schematic eye
model published by
Navarro et al
2.
Optos OCT line scan
The scanner moves back and forth along the line of a selected location on the retina (fundus) and generates a
cross-sectional OCT image. The line scan is 12 mm in length.
The Optos OCT line scan mode lets you capture cross sectional B-Scan OCT images of the vitreo-retina, retina
and choroid-retina structures.
This scan is also known as a B-scan OCT.
1. Ultra-widefield images provide a field of view of up to 200° in a single capture.
2. Isabel Escudero-Sanz and Rafael Navarro, "Off-axis aberrations of a wide-angle schematic eye model," J. Opt. Soc. Am. A 16, 1881-1891 (1999).
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