Zeiss CIRRUS HD-OCT 500, User Manual

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CIRRUS HD-OCT User Manual 2660021169012 Rev. A 2017-12
Posterior Segment
8-21
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On Screen 2 ( Figure 8-14 ), the sub-RPE illumination segmentation is overlaid on the RPE
Elevation Map. The sub-RPE illumination segmentation is shown with an outline. This
image shows the fovea location with a dot marking and a circle corresponding to 3 mm
and 5 mm diameter circles centered on the fovea. This image is superimposed on top of the
Fundus image.
Use the caliper to measure distances on the RPE Profile Map.
NOTE: Caliper measurements are not saved!
Calculated values are of the current scan minus the prior, as well as the percent change in
elevations and illumination since the previous scan.
The volume of RPE elevations, as well as the area and distance of the sub-RPE illumination
around and from the Fovea respectively, are shown. If no sub-RPE illumination is seen in
the circle, the value shown is 0.0. A warning message will appear if the 5 mm circle
extends outside of the scan window or if the scan is too low in the B-scan window.
Advanced RPE Analysis may occasionally identify RPE elevations or areas of sub-RPE
illumination in normal subjects. In a post-hoc analysis of 115 subjects from the diversified
normative database, the software identified RPE elevations in the 5 mm circle in 2.6% of
the subjects, with a mean of 0.006 mm
2
for area and 0.0002 mm
3
for volume. In the same
analysis, the software identified areas of sub-RPE illumination in 6.1% of the subjects, with
a mean area of 0.08 mm
2
.
NOTE: Calculated differences do not consider test-retest variability.