Zeiss 3000 - Adjust Scan Placement

Acquire Scans
Stratus OCT User Manual PN 2660021134133 A
3-8
• Once you have a retinal scan image on the screen, click the Optimize Polarization
button on the Scan Parameter Tab (pictured above).
• You can incrementally adjust the polarization using the P
olarization arrow buttons. If
you do, you may note that there are several local maxima in the 180-degree range of
polarization. These optional polarization settings may yield scan signals comparable
to and occasionally better than the signal achieved using the Optimize button.
• Polarization should be adjusted w
hen initiating scanning on each new eye. It need
not be readjusted when performing a series of consecutive scans on an eye if it has
been done at the beginning of the series.
• You can use the Optimize P
olarization button in both Alignment and Acquisition
Scan Modes (see page 3-4). The results of adjusting the pola
rization may be better
appreciated when the scanner
is in slow mode.
Adjust Scan Placement
Accurate scan placement on the desired retinal feature is nearly automatic with the Stratus
OCT, because:
1. The instrument detects which eye is being scanned and,
2. It automatically places the fixation target in the correct location for the eye and scan
acquisition pr
otocol you have selected.
Still, the S
CAN ACQUISITION WINDOW offers two intuitive and easy methods to precisely adjust
scan placement, so you can scan the exact part of the retina you want.

Note: Both the scan placement methods described below work in both alignment
and acquisition scan modes.
Click and Drag
You can simply click and drag the scan pattern and put it exactly where you want it. As
l
ong as the video image is live, scan placement is always adjustable.

Note: Right-click anywhere in the scan image and a vertical line appears in the
center of the scan image. Click again to remove it. This is useful to determine if you
have centered the desired retinal feature, e.g., the fovea.
Move the Scan Pattern
4-headed arrow—Moves the whole
scan pattern or fixation LED.
By default, the click and drag method works on the scan pattern. To drag the scan pattern,
position the pointer near the center of the scan pattern until the four-headed arrow
ap
pears (as pictured at left). Then click and drag.
•
2-headed arrow—Changes the
length and angle of scan patterns.
The two-headed arrow appears when the pointer is near the edge of a scan pattern.
Click and drag with this arrow to adjust the scan size, and the angle if available (see
Size and Angle, page 3-14 for more information).