Blind Spot Monitor; Gaze Tracking; Head Tracking; Vertex Monitoring - Zeiss HUMPHREY 720i User Manual

A-28 H-4
PROBLEM

Blind Spot Monitor

Can't change Blind Spot size
Can't find blind spot
Blind Spot alarm beep
keeps sounding

Gaze Tracking

Gaze Tracking will not initialize

Head Tracking

Head Tracking does not work
Head Tracking alarm
activated too often

Vertex Monitoring

Vertex Monitoring does not work
Vertex Monitoring alarm beep
goes off too often
REV. B 02/03 PN 51680-1 R E V . A 10 9/ 9 8 P N 47653
POSSIBLE CAUSE OR SOLUTION
• HFA II uses same stimulus size for testing and Blind Spot check (3)
• Realign patient (5)
• Verify that proper eye is being tested (5)
• Check to make sure the patient's non-testing eye is occluded (5)
• Make sure patient is not looking around but fixating on fixation light (5)
• Select FIXATION button and then press RE-TRY TO FIND BLIND SPOT (5)
• Same as "Can't find blind spot" above
• Blind Spot may be turned off during test by pressing FIXATION
• High power trial lens being used (5)
• Droopy eyelid - ask patient to open eye wider during initialization (5)
• Interfering eyelashes - ask patient to open eye wider during initialization
• Small pupils (5)
• Excessive eye movement or blinking (5)
• Excessively large or dilated pupils (5)
• Dry eyes, cloudy media or dark iris (5)
• Deep-set eyes (5)
• Head Tracking not turned on (2)
• Trial lens holder not in Up position (5)
• Gaze Tracking was not initialized at the start of the test (5)
• Patient's chin not moving with the chin rest - re-instruct patient (5)
• Reset Head Tracking (5)
• Turn off Head Tracking - press TURN OFF HEAD TRACKING
• Vertex Monitoring not turned on (2)
• Trial lens holder not in Up position (5)
• Gaze Tracking was not initialized at the start of the test (5)
• Patient moving away from trial lens - reposition patient (5)
• Vertex Monitoring needs to be reset - press RE-INITIALIZE VERTEX (5)
• Turn off Vertex Monitoring - press TURN VERTEX OFF (5)
HUMPHREY FIELD ANALYZER II - H U M P H R E Y F I E L D A N A L Y Z E R
APPENDIX H APPENDIX A
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