Zeiss HUMPHREY 720i, User Manual

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11-8 KINETIC TESTING
REV. B 02/03 PN 51680-1 HUMPHREY FIELD ANALYZER II - i series
The projection system has limits on how far out it can project a light stimulus. The following
graph shows the projector’s limitation when using the 80˚ field size:
When activated, the HFA II will display the stimulus inside the bowl for one second at the
starting point of the chosen meridian. It will then begin moving the stimulus toward fixation
and into the patient’s field of vision. If the patient does not respond by the time the stimulus
reaches the central fixation point, the light will be turned off. The instrument will beep.
Note: The first stimulus of each isopter will be delayed longer than the one second
described above. The HFA II is verifying the stimulus before beginning the isopter.
Presenting a stimulus
along a meridian
Peripheral testing limits
0˚
30˚
180˚
150˚
60˚ 120˚
90˚
210˚
240˚
270˚
300˚
330˚
80˚
80˚
67˚
67˚
58˚
50˚
58˚
80˚
62˚ 60˚
62˚
80˚
Figure 11.1: Peripheral 80˚ Testing Limits for Selected Meridians
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