Abstract • We compared the traditional intuitive criterion (fixed at 5 dB) with the variable Statpac 2 criterion of the Humphrey Field Analyzer for identifying visual deterioration at individual points within a visual field. The separation of depressed from stable points in 123 follow-up fields of 17 patients, when all points within a field were considered, was reasonably equivalent between the two methods (k = 0.55 ± 0.027 [± SE]). Centrally located points within the field demonstrated a stronger agreement (k = 0.68 ± 0.028), because the fixed criterion more often labeled the edge points as having progressed than did the Statpac 2 algorithm. The glaucoma change probability printout is more simply obtained than the manual comparison required for intuitive interpretation with a fixed criterion, and it is potentially more accurate because of its reliance on a database that permits a variable criterion to be applied. References 1. Heijl A, Lindgren G, Lindgren A, et al. Extended empirical statistical package for evaluation of single and multiple fields in glaucoma: Statpac 2 . In: Mills RP, Heijl A, eds. Perimetry Update 1990/91 (Proceedings of the IX International Perimetric Society, June 12, 1990) . New York, NY: Kugler Publications; 1991:303-315. 2. Heijl A, Lindgren A, Lindgren G. Test-retest variability in glaucomatous visual fields . Am J Ophthalmol . 1990;109:110. 3. Heijl A, Lindgren A, Lindgren G. Test-retest variability in glaucomatous visual fields . Am J Ophthalmol . 1989;108:130-135. 4. Fleiss JL. Statistical Methods for Rates and Proportions . New York, NY: John Wiley & Sons Inc; 1981:212-225.
Archives of Ophthalmology – American Medical Association
Published: Dec 1, 1991
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