Related Experiment Video
Updated: Oct 13, 2026
Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
Published on: May 25, 2020
The efficacy of the dicon screening field to detect eyes with glaucomatous field loss by Humphrey threshold testing
A S Huang1, S D Smith, H A Quigley
1Department of Ophthalmology, University of Minnesota, Minneapolis, USA.
Purpose:
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.
Conclusion:
Dicon suprathreshold testing is a practical means to differentiate between some persons with glaucomatous damage and glaucoma suspects.
