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December 1991

Statpac 2 Glaucoma Change Probability

Author Affiliations

From the Bascom Palmer Eye Institute, Department of Ophthalmology, University of Miami (Fla) School of Medicine. Dr Morgan is now with the Dean McGee Eye Institute, Oklahoma City, Okla.

Arch Ophthalmol. 1991;109(12):1690-1692. doi:10.1001/archopht.1991.01080120074029

• 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.