Testing
Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
5-4
The three controls on the video eye monitor are: a plus sign (+) to brighten the image, a minus sign
(-) to dim the image, and an OFF button to turn off the eye monitor display. To re-display the
monitor, press the upper-left EYE button.
Figure 5.2 The Video Eye Monitor
Gaze Tracking (Models 740
i
, 745
i
, 750
i
)
Gaze Tracking is a unique fixation tracking system that r
ecords whether the patient is fixating
properly while stimuli are being presented. A brief initialization procedure is required at the start of
each test to calibrate and adjust the Gaze Tracker to the patient’s eye. It is imperative, therefore,
that the patient maintain the same position during gaze initialization and testing. Deviations are
recorded and displayed on the test screen and on the printout.
Note: Some patients with small pupils, ptotic lids, interfering lashes, or strong pr
escriptions may not
be good candidates for gaze monitoring.
On the Start of Test screen, you can make changes to the
fixation monitoring system, or turn the
monitoring system off entirely by pressing CHANGE PARAMETERS and selecting the desired option.
You may select Gaze Tracking only at the start of a test; however, it may be turned off at any time
during
the test.
The Gaze Graph
The gaze graph is a useful method for documenting movement
of the patient’s test eye. A test starts
with no markings on the gaze graph. As time progresses, the graph expands from the right, marking
eye movement and blinks.
Upward markings indicate that the test e
ye deviated from the fixation target at the time of stimulus
presentation. The higher the marking, the greater the deviation. The direction of deviation from the
fixation target is not indicated. Only the magnitude is recorded.
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