Zeiss CIRRUS HD-OCT 500, User Manual

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Anterior Segment Scans
2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual
6-10
• Click the center of the pupil and use the screen X-Y and Z controls or keyboard arrow
keys and mouse scroll wheel to center the scan on the corneal vertex with the anterior
chamber visible in the B-scan viewport.
A strong vertical central reflection line on the B-scan indicates the scan is centered on
the corneal vertex.
• Center the image to see the lens of the eye and the anterior chamber angles.
• If the anterior chamber seems tilted, instruct the patient to shift his/her gaze slightly to
the left or right as needed to horizontally orient the anterior chamber.
• Separate the cornea image and mirror image as much as possible, without letting the
cornea images touch the iris images.
The correct position of the scan is shown in Figure 6-3 . Three incorrectly aligned images
are shown in Figure 6-4 : one with the iris touching the cornea, one with the cornea too
close, and one with an off–center image that obscures the eye lens.
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Anterior Segment Cube Scan
The Anterior Segment Cube 512x128 Scan provides the data used for the Anterior Segment
Analysis (
"Anterior Segment Scans" on page 6-6 )
The Acquire screen displays the position of the Anterior Segment Cube 512x128 scan
pattern on the live iris image. The OCT B-scan images on the right correspond to the
horizontal and vertical scan lines of the selected slice in the cube, with the smaller images
corresponding to the top and bottom horizontal cube slices (see
Figure 6-5 ).