THE EFFICACY OF THE DICON SCREENING FIELD TO DETECT EYES WITH GLAUCOMATOUS FIELD LOSS BY HUMPHREY THRESHOLD TESTING

Purpose: The authors compare the results of the Dicon suprathreshold, kinetic fixation perimeter with multiple stimulus presentation to auto mated threshold perimetry (Humphrey) in the same eye. Methods: A Dicon screening visual field test and a Humphrey threshold visual field tes t were performed in 148 eyes of 148 persons with glaucoma or who were suspect for glaucoma. The number and pattern of missed points on the D icon test were compared with Humphrey global indices in each eye. Resu lts: The median time to complete the 40-point, Dicon suprathreshold te st was 2.7 minutes per eye. Regression analyses indicated that Dicon t est parameters were modestly correlated with Humphrey corrected patter n standard deviation (CPSD) probability and mean deviation (R-2 rangin g from 0.21 to 0.46, p = 0.000). With glaucoma defined as a Humphrey G laucoma Hemifield Test (GHT) result of outside normal limits, the best mix of sensitivity and specificity of Dicon results occurred at 2 or more missed points, with sensitivity of 64% and specificity of 83%. Th e specificity was maximum (90%) with a Dicon criterion of 3 or more ad jacent missed points, but sensitivity at this level was 55%. With glau coma defined by CPSD probability value less than 1%, sensitivity and s pecificity for two adjacent missed Dicon points were 69% and 87%, resp ectively. Conclusion: Dicon suprathreshold testing is a practical mean s to differentiate between some persons with glaucomatous damage and g laucoma suspects.