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C CLINICAL RESEARCH

Figure 14: The visual field Glaucoma Progression Analysis (GPA) for a patient with POAG who has shown slow progression over
an 8-year period. The trend-based analysis (a) shows a rate of progression of -0.7+/-0.2%/year. The bar to the right of the graph
is a visual representation of the expected visual field loss after 5 years: the top white section is the amount of current visual field
loss, the middle gray hatched section is the expected loss of visual field at the current rate of change over 5 years, and the bottom
darker gray hatched section is the expected vision to remain after 5 years. The event-based analysis at the bottom (b) shows a
cluster of defects that have changed significantly from baseline over one (hollow triangle), two (semi hollow triangle) and three
(solid triangle) exams. Both the event- and trend-based analyses flag this patient as having progressed; however, while the trend-
based analysis suggests relatively slow global change, the event-based analysis shows significant localized change threatening
fixation. This patient was followed with atypical ONHs for 15+ years with IOPs in the low 20s. She eventually converted to
manifest glaucoma. Treatment was initiated with SLT but failed, and she is now successfully managed on PGA alone.

Figure a

Figure b

44 CANADIAN JOURNAL of OPTOMETRY | REVUE CANADIENNE D’OPTOMÉTRIE VOL. 79 SUPPLEMENT 1, 2017