Zeiss CIRRUS HD-OCT 500, User Manual

Page: 89 / 352

CIRRUS HD-OCT User Manual 2660021169012 Rev. A 2017-12
Anterior Segment Scans
6-17
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Guidelines for Pachymetry Scan Acquisition
The Pachymetry scan is similar to the HD Cornea scan, but you must align two scans rather
than one.
• Attach the external Cornea lens to the instrument lens mount, see "Anterior
Chamber and Cornea External Lenses" on page 6-7 .
• Instruct the patient to fixate on the center of the fixation target even though it may
not appear to be in focus.
• Click the center of the pupil and use the X-Y and Z controls to center the scan on the
corneal vertex until the cornea is visible in the B-scan viewports.
• Align the images in the two B-scan viewports by fine adjustment of the X-Y controls
using the keyboard arrow keys. To center both images, first center the bottom image
with the keyboard arrow keys until you see the corneal reflex in the upper image. The
up arrow brings the image down and to the right. The down arrow brings the image
up and to the left. Press the Ctrl key with arrow keys for finer adjustments.