Angle Measurements; In Hd Angle Analysis - Zeiss CIRRUS HD-OCT 500 User Manual

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Anterior Segment
NOTE: Vertical distances on the tomogram reliably show tissue thickness and tissue
refractive index. Horizontal distances cannot be measured quantitatively on these
tomograms. When applied to Anterior Segment scans, the Ruler measures only vertical
distances, with the scale factor set appropriately for measurements within the cornea.
NOTE: The Ruler is calibrated for measuring corneal tissue only, based on the refractive
index of the cornea. It is not calibrated for other tissue types.
NOTE: The Anterior Scan Cube 512x128 is initially be displayed in the High–definition
mode. Click the Show/hide high–resolution images button to allow scrolling through the
cube images or move a slice navigator to a different slice.
NOTE: For the Anterior Segment 5 Line Raster scan, only the ruler and reverse grayscale
buttons are available.

Angle Measurements

Three analysis types allow you to measure the angles of the Cornea.

In HD Angle Analysis

This is the recommended analysis type for anterior angle measurement.
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CIRRUS HD-OCT User Manual 2660021169012 Rev. A 2017-12