Zeiss CIRRUS HD-OCT 500, User Manual

Page: 68 / 352

Patient Preparation
2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual
5-10
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Patient Preparation
In preparation for all patient visits, first clean Instrument Surfaces and adjust table height.
1. Wipe the chin rest and forehead rest with an alcohol pad, and allow the assembly to
dry.
2. Adjust the table so the embossed line on the ocular cover is approximately at the
same height as the patient’s eye.
NOTE: The table adjustable height switch is mounted on the rear underside of the table, on
the operator's right side.
3. After adjusting the table height, instruct the patient to sit back and relax.
Optional Dilation of Patient’s Eye(s) (Posterior Segment)
The minimum pupil size for CIRRUS HD-OCT is 2 mm. This can usually be achieved without
dilation. If dilation is performed on a subject for an exam, we recommend that dilation be
used on subsequent visits if quantitative comparisons will be made. Dilation should not
directly affect the quantitative measurements, but it may affect them indirectly by allowing
more variability in how the OCT beam enters the eye. Although such an effect should be
small, optimal repeatability will be achieved by imaging the patient in the same way at
every visit.
Position the Patient on the Chinrest
NOTE: Before the patient puts his or her head in the chinrest, click to select the desired
scan type for either eye as described in
Chapter 6 "Acquiring Scans" . Once the scan
has been selected, the automated chinrest will go to the default position for the selected
scan type and eye. By selecting an anterior segment scan, the CIRRUS HD-OCT will bring