REV. B 02/03 PN 51680-1
HUMPHREY FIELD ANALYZER
II -
i
series
TESTING
5-6
It is possible in certain
situations for the Head
Tracking feature to “lose its
place”. The most common
reason for this is a sudden
shift of the eye or reposition-
ing of the head. A patient
whose head does not move
with the chin rest will cause
Head Tracking to beep. A
pop-up window will appear
giving you the opportunity to
continue or discontinue
using Head Tracking. The HFA II continues testing while the message is on the screen. You
should re-instruct your patient at this point. Make sure that the chin rest supports the patient’s
head. This will ensure that the head moves with the chin rest.
Vertex monitor
The Vertex Monitor will beep and display a message on the touch screen if the patient backs
(model 750i)
away more than 7 mm from his or her original position. This helps to eliminate the trial lens as
a source of visual field defects. Refer to Section 2: “System Setup – Vertex Monitor” for
instructions on turning on the Vertex Monitor.
The vertex reading is based on the initial patient position in front of the trial lens. To set:
1. Make sure that the trial lens holder is in the up position in front of the eye
2. Properly align and instruct the patient
3. Initialize the Gaze Tracking feature
The Vertex Monitor alarm will
beep if the patient has backed
away from the trial lens. Testing
will continue uninterrupted and
a message will remain on the
screen until cleared by the
operator. Check the position of
the patient’s forehead and
reposition if necessary. If the
Vertex Monitor continues to
sound, press RE-INITIALIZE
VERTEX. The test will pause as
the screen displays the Gaze
Track initialization sequence. This will reset the Vertex Monitor. The Vertex Monitor may also
be turned off from this screen or by pressing FIXATION from the Test in Progress screen. The
Vertex Monitor is turned off only for the length of the current test.
Note: The Vertex Monitor only works when the trial lens holder is in use and Gaze Track-
ing has been successfully initialized. The Vertex Monitor is only necessary when a trial
lens is used.
5.htp
3/14/03, 3:15 PM
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Summary of Contents for HUMPHREY 720i
Page 1: ...HUMPHREY FIELD ANALYZER II i series USER S GUIDE Model 720i Model 740i Model 745i Model 750i...
Page 4: ......
Page 26: ...1 18 INTRODUCTION INSTRUMENT SETUP REV B 02 03 PN 51680 1 HUMPHREY FIELD ANALYZER II i series...
Page 116: ...6 8 TEST RELIABILITY REV B 02 03 PN 51680 1 HUMPHREY FIELD ANALYZER II i series...
Page 208: ...10 20 CUSTOM TESTING REV B 02 03 PN 51680 1 HUMPHREY FIELD ANALYZER II i series...
Page 284: ...12 14 CARE AND CLEANING REV B 02 03 PN 51680 1 HUMPHREY FIELD ANALYZER II i series...
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