Zeiss CIRRUS HD-OCT 500, User Manual

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Acquire Screen and Controls
2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual
6-24
Fundus Viewport
The Fundus Viewport lies in the lower left quadrant of the main Acquire screen Viewport as
shown in
Figure 6-12 , and shows a live fundus image from the line scanning
ophthalmoscope (LSO). The Fundus Viewport is not available for Anterior scans. As with
the Iris Viewport, there are a number of options available for optimizing the patient scan:
• Focus/Auto Focus will attempt to compensate for the patient’s refractive error by
automatically changing the focus adjustment. This may help clear up a dim fundus
view and will also help clear up the fixation target for a patient whose refractive error
is considerable. In addition to improving the overall focus, the Auto Focus feature will
do an additional adjustment on the brightness and contrast of the fundus image.
• The Transparency slider is active when a saved scan image overlay is present, which
occurs when you are using a prior scan.
• Prior scan will appear as a selectable link, as shown in the margin. If your patient has
been scanned previously, selecting this option will open up a small screen with a list of
the patient’s previous scans. Once you select a previous scan, the location of that scan
will appear as a live link, and serve as a reference as you acquire the current scan. You
can change the prior, reference scan, at any time. You can also initiate an exact replica
of a prior scan using the Auto Repeat function (
Figure 6-20 ).
• Optimize automatically optimizes first the scan image centering (Z-offset), and then
optimizes the scan image quality (polarization). Instruct the patient not to blink during
optimization.
• Enhance ( ), adjust brightness and contrast ( ), or reset the fixation target .
When you select ( ), one of the following dialog boxes will appear.
• If you have the tracking selection enabled ( "Toolbar Options" on page 3-5 ),
tracking on the macula, FastTrac automatically monitors whether the OCT B-scans are