Zeiss CIRRUS HD-OCT 500, User Manual

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CIRRUS HD-OCT User Manual 2660021169012 Rev. A 2017-12
Anterior Segment
8-41
Anterior Segment
Anterior Segment features are viewed and measured by accessing the following CIRRUS
HD-OCT analyses. If you are unsure as to which scans need to be acquired in order to
access the appropriate analysis, see Table 8-1.
Anterior Chamber Depth and Lens Vault
To measure Anterior Chamber depth and the Lens Vault, you must have scanned Anterior
Chamber data (see "
Anterior Segment Scans" on page 6-6 ).
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The iris image with the single line scan pattern in Figure 8-25 indicates the location used
to generate the displayed Anterior Chamber scan. The length and angle of the scan is
indicated both on the iris image and above the OCT B-scan. A chart indicating the
Chamber Area Measurement and the Value (in mm
2
) is displayed to the right of the iris
image. A small image of the mirrored corneal image that is not processed is also displayed.
A mirror artifact indicating an area of data that is poorly resolved and inverted in the axial
direction is often detectable. While it is possible to hide the mirror artifact in most parts of
the image, it will invariably intersect the true data at two places in the cornea. These
intersections appear as distinctive bars on the image. You can view image data in these 2
locations by selecting the HD Cornea scan ("
Anterior Segment Scans" on page
6-6 ).To measure Anterior Chamber Depth:
1. Click the Add ACD Tool button (above the image of the anterior chamber) to
access the tool. It will appear on the image of the Anterior Chamber such that the
vertical arm is positioned at the anterior surface of the cornea, and another marker is
positioned at the corneal vertex of the posterior surface, as shown below.