Zeiss Humphrey II-i series, User Manual

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Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
Guided Progression Analysis (GPA) 8-21
GPA Case 4a: Poor Quality Default Baseline
Figure 8.10a Poor Quality Default Baseline
Here is an excellent example of why the doctor should always verify that the chosen Baseline tests
properly represent a stable condition. In the above example, an incorrect Baseline test A was
created when the technician mistakenly tested the patient’s right eye as if it were his left eye. Note
the Blind Spot demarcated on the right-hand side of the visual field in the second Baseline test A.
GPA automatically selected the first and second oldest exams to act as the Baseline. The HFA has no
way of recognizing that the second Baseline test was incorrectly saved as a left eye test. Thus, it is
imperative that the doctor check the validity of the Baseline tests prior to making decisions based on
GPA Follow-up findings.
A