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Tips for Gaze Tracking and Head Tracking
Gaze Tracking is available on the HFA II Models 740
i
on the Model 750
. The keys to successful Gaze and Head Tracking are the same keys that result in
successful visual field testing. Make sure that you move the patient's chair close to the instrument. If
optional slider is available, remember to slide the instrument toward the patient so the patient can
sit in a comfortable, upright position. Make sure the patient opens his or her eyes wide and tries to
stay still during the initialization process.
Always monitor and encourage the patient. Early correction of any poor compliance will help to
increase the reliability of the visual field results.
Gaze Tracking may not work well in the following situations:
• Very small pupils, droopy eyelids or long eyelashes.
• Excessively large or dilated pupils.
• High powered trial lenses.
• Excessive eye movements or blinking.
• Cloudy media.
• Very dark iris.
• Dry eye.
• Deep-set eyes.
We recommend you attempt to initialize Gaze Tracking at least three times before discontinuing. Ask
your patient to blink quickly during the mid-point of a long Gaze Tracking initialization as a drying
eye will sometimes cause it not to work. During the test, instruct the patient to blink occasionally
when pressing the patient button, as this will greatly reduce interruptions to Gaze Tracking.
Remember, if Gaze Tracking does not initialize successfully, Head Tracking, pupil size measurement,
and Vertex Monitoring cannot be utilized. Blind spot monitoring and visual observation are still
available to assess the reliability of the test results in these cases. You may wish to enter comments
concerning fixation issues on the Patient Data 1 screen or write directly onto the printout.
Test Complete Screen Options
Saving the Test
Two beeps sound to signal the end of the visual field test. Advise the patient the test has finished
and that he or she may relax. At this time, you can save the results to the hard disk or a USB storage
device, transmit the test, test the other eye, or print a hard copy of the test results. You should
always save the test results for each eye before proceeding with other options.
You will be asked to confirm that the patient's name and date of birth are correct
You may:
• Accept the patient data and save the test by pressing YES.
• Change the patient data before saving the test results by pressing CHANGE PATIENT DATA
FIRST (see
"To Change Patient Data:," on page
pressing PROCEED, the test will automatically be saved,
• Return to the Test Complete screen, without saving test data by pressing NO.
Humphrey Field Analyzer II-
i
series User Manual
i
i
i
, 745
, and 750
. Head Tracking is only available
(Figure
10-14). After changing patient data and
2660021145640 A
Testing
5-13
5.5).
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Troubleshooting
