Statpac 2 glaucoma change probability
R. K. Morgan, W. J. Feuer and D. R. Anderson
Bascom Palmer Eye Institute, Department of Ophthalmology, University of Miami, School of Medicine, FL 33101.
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 (kappa = 0.55 +/- 0.027 [+/- SE]).
Centrally located points within the field demonstrated a stronger agreement
(kappa = 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.
