The efficacy of the dicon screening field to detect eyes with glaucomatous field loss by Humphrey threshold testing.
OBJECTIVE
The authors compare the results of the Dicon suprathreshold, kinetic fixation perimeter with multiple stimulus presentation to automated threshold perimetry (Humphrey) in the same eye.


METHODS
A Dicon screening visual field test and a Humphrey threshold visual field test 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 Dicon test were compared with Humphrey global indices in each eye.


RESULTS
The median time to complete the 40-point, Dicon suprathreshold test was 2.7 minutes per eye. Regression analyses indicated that Dicon test parameters were modestly correlated with Humphrey corrected pattern standard deviation (CPSD) probability and mean deviation (R2 ranging from 0.21 to 0.46, p = 0.000). With glaucoma defined as a Humphrey Glaucoma 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%. The specificity was maximum (90%) with a Dicon criterion of 3 or more adjacent missed points, but sensitivity at this level was 55%. With glaucoma defined by CPSD probability value less than 1%, sensitivity and specificity for two adjacent missed Dicon points were 69% and 87%, respectively.


CONCLUSIONS
Dicon suprathreshold testing is a practical means to differentiate between some persons with glaucomatous damage and glaucoma suspects.
Huang
A S
AS
Department of Ophthalmology, University of Minnesota, Minneapolis, USA.
Smith
S D
SD
Quigley
H A
HA
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis; D012680:Sensitivity and Specificity; D012684:Sensory Thresholds; D014786:Vision Disorders / Q000175:diagnosis*; D058609:Visual Field Tests / Q000295:instrumentation / Q000379:methods*; D014794:Visual Fields