Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
Testing
5-7
Supplemental Testing
If selected, the HFA II-
i
performs Foveal Threshold and Gaze Tracking initialization. They are called
“supplemental tests.” These optional procedures are run prior to the start of the standard testing.
Foveal Threshold
The Foveal Threshold test measures t
he sensitivity of the central part of the macula, the fovea.
Foveal threshold testing is only available with threshold visual field tests. Whenever the Foveal
Threshold parameter is turned ON, the Foveal Threshold test is the first supplemental test procedure.
Press CHANGE PARAMETERS to turn Foveal Threshold ON.
1Press START. The Foveal Threshold test window will appear.
2The small diamond fixation target will light up below the central
fixation target. Instruct the patient to look at the center of the lower
fixation lights (in the center of the diamond).
3Tell the patient to press the response button whenever he or she
sees a light inside of the fixation diamond.
4Press START to begin the Foveal Threshold test.
5When completed, a second pop-up window will appear. The yellow
light will return to the central fixation target.
Direct the patient to look at the central fixation target. Press START to
begin Gaze Tracking initialization (or begin the test if Gaze Tracking is
inactive).
Note: The Foveal Threshold value will display in the center of
the visual field on the test screen. It is recorded below the reliability
indices on the printout.
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Central Fixation Target
Fixation Diamonds
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