Guided Progression Analysis (GPA)
Humphrey Field Analyzer II-
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series User Manual 2660021145640 A
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Figure 8.13b Improving Out of Range Points - Follow Up 2
The nasal step is still apparent on the Pattern Deviation plot. Now the points no longer are marked
“Out of Range,” but are considered stable. Should progression occur in the future, GPA will be
available to assist in recognizing any change at these nasal step points.