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C CLINICAL RESEARCH

Figure 12: This figure is a single field analysis of a patient with a superior paracentral defect, extending to a partial arcu-
ate, from moderate POAG. The three indices of test reliability (1) show that this is a reliable visual field. Mean deviation (2)
is borderline with a value found in less than 2% of an age-matched population. Pattern standard deviation (3) is outside
normal limits with a value found in less than 0.5% of an age-matched population. The Glaucoma Hemifield Test (4) has been
flagged as outside normal limits, and the Visual Field Index (5) is 94%. The VFI is center-weighted which is why the value is
decreased more than it would be if the same cluster of missed points were localized peripherally instead of centrally.

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