Testing
Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
5-12
• Many downward markings appear on the Gaze Graph, indicating that Gaze Tracking was
having trouble detecting the patient’s gaze direction.
• Head tracking moved the patient’s head too far in the wrong direction.
• The vertex monitor alarm was sounding too often, even with good head posi
tioning.
Turn Off Blind Spot Monitor
Press this button to turn off the Heijl-Krakau method of B
lind Spot Monitoring. If you chose
Gaze/Blind Spot at the start of the test and Gaze Tracking is initialized, the Gaze Tracking will
continue to monitor fixation while the blind spot monitor is turned off. If you turn off both Gaze
Tracking and blind spot monitoring, you can assess the patient’s ability to fixate by observing him or
her with the video eye monitor.
Re-try To Find Blind Spot
This will initiate discovery of the patient’s blind sp
ot by using the stimulus to search in the area of
the blind spot for the exact location. This is sometimes necessary, for example, when the patient’s
head tilts during the test.
Turn Off All Fixation Monitoring
This command will turn off both Gaze Tracking and Blind Spot Monitoring if pr
essed. In this case,
you can monitor the patient’s fixation by watching the video eye monitor for the duration of the test.
Both Head Tracking and Vertex Monitoring will be turned off as well, when you discontinue Gaze
Tracking.
Turn Off Gaze Tracking (Model 740
i
, 745
i
, 750
i
)
This will turn off the Gaze Tracking device on all thre
e of these models, as well as the Head Tracking
and Vertex Monitoring of the Model 750
i
, for the current test. Blind spot monitoring is not affected.
Turn Off Head Tracking (Model 750
i
)
You will turn off only Head Tracking by pressing this button.
Turn Off Vertex Monitoring (Model 750
i
)
You will turn off only the Vertex Monitor by pressing this button.
Note: If you lower the trial lens holder during the test, you also will turn off the Head Tracking and
Vertex Monitoring devices of the Model 750
i
. You should never put down the trial lens holder after
the test has begun unless directed to do so. An example of where this is necessary is prior to the
continuation of a Full Field test to test the peripheral portion of visual field.
Cancel
This button will resume testing without any changes.
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