Tips For Gaze Tracking And Head Tracking - Zeiss HUMPHREY 720i User Manual

TESTING
Tips for gaze tracking
and head tracking
REV. B 02/03 PN 51680-1
The keys to successful Gaze and Head Tracking are the same keys that make for successful
visual field testing. Make sure the patient's chair has been moved close to the instrument.
If 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.
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 patient results in these
cases.
HUMPHREY FIELD ANALYZER II -
5-13
i
series