Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
Test Reliability
6-5
In addition to a high false positive finding, trigger happy patients often show threshold results that
are abnormally high. An example of this phenomenon is shown in Figure 6.1. Any individual point
result of 40 dB or greater indicates a hypersensitive re
sult which can only be due to patient
overreaction or guessing when pressing the patient response button. It is best to note the results
early in the exam and start the test over rather than to allow the test to run to completion and be
completely invalid.
Gaze Graph
Fixation Losses
False Positive
False Negative
Abnormally high results
Figure 6.1 Sample Printout Showing Poor Reliability
The example in Figure 6.1 indicates a very unreliable patient. A high number of fixation losses, false
positive errors, and false negative erro
rs have been recorded. Poor fixation is indicated by the Gaze
Graph. Also note the number of points where threshold results are 40 dB or higher.
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