Zeiss Humphrey II-i series, User Manual

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Test Parameters and Strategies
Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
4-8
FastPac™ FastPac decreases Full Threshold test time by about 40%. It follows a
similar stair-stepping technique as in Full Threshold, but uses 3 dB
increments instead of 4 dB and crosses the threshold only once.
Test Speed Normal Two stimulus presentation speeds are available.
Slow You may change the test speed while a test is in progress to allow the
patient some additional time to respond. However, with SITA, the Normal
setting adjusts test speed automatically for a slow responding patient.
Fixation Target Central Yellow light in the center of the bowl.
Small Diamond The Small Diamond is located below the Central target, and should be
used when a patient cannot see the central fixation light (
e.g.
macular
degeneration). The patient should look in the center of the diamond
formed by the four lights.
Large Diamond The Large Diamond is located below the Central target and is useful for
patients with central scotoma who cannot see either the Central fixation
light or the Small Diamond.
Bottom LED Some tests have points in the superior visual field that require a lower
fixation light than the central target. The target used is the Bottom LED of
the Large Diamond. When testing with the Superior 64 or Superior 36
Screening Specialty tests, the Bottom LED is the default fixation target. It is
illuminated automatically at the start of a test.
Fixation Monitoring Gaze/Blind Spot

(Model 740 i -750 i )
The Blind Spot and Gaze Monitoring system are both activated.
Gaze Track

(Model 740
i
-750
i
)
The Gaze Track system automatically measures gaze direction at the time
of stimulus presentation. Refer to
“Gaze Tracking (Models 740i, 745i,
750i),” on page 5-4 , for more information.
Blind Spot The test program periodically presents a stimulus in the patient’s blind
spot. If the patient is fixating well, he or she should not see the blind spot
check stimulus. The Blind Spot check stimulus always matches the test
stimulus size. Refer to
“Fixation Losses,” on page 6-4 , for additional
information.
Off Disables Gaze Track and Blind Spot fixation monitoring. The operator
should monitor fixation with the video eye monitor.
Table 4.2 Threshold Test Parameters
(Factory default parameter settings appear in bold print.)
Threshold

Parameters
Parameter

Settings
Description