Patient Instructions; Of Special Note For Anterior Scans - Zeiss CIRRUS HD-OCT 500 User Manual

5-12

Patient Instructions

2660021169012 Rev. A 2017-12
Patient Preparation
CAUTION: The operator should check that the patient is not holding on to the instrument
before or during tests. Although movement of the motorized chinrest is slow, giving plenty
of warning for patients to remove their fingers, there is potential for fingers to be squeezed
and possibly injured if left in the area shown below.
1. Instruct the Patient to Focus on the Fixation Target.

Of Special Note for Anterior Scans

Ensure the corneal scans are centered on the corneal vertex
Instruct the patient to fixate on the center of the fixation target, even though it may
not appear to be in focus.
• The internal fixation target is centered. For all anterior segment scans, the
patient sees the green fixation target against a black background. The flashing
red lines showing the scan pattern of the selected scan type are blurry.
• The iris illumination is dimmed by default to avoid causing pupillary constriction.
• The internal lens audibly clicks as it is brought into position.
The HD Angle is the preferred scan for imaging the anterior chamber angle. It gives
the highest resolution and greatest detail of the iridocorneal angle. Wide Angle to
Angle and Anterior Chamber scans may also be used for anterior chamber
angle analysis.
2. Instruct the research subject to focus on the green star fixation target in the imaging
aperture and blink naturally throughout the alignment process.
3. With the subject's eye aligned with the scan beam in three dimensions and image
tools applied, instruct the research subject to blink and then open eyes wide during
acquisition.
CIRRUS HD-OCT User Manual