Factors affecting foveal threshold measured by short-wavelength automated perimetry in primary open angle glaucoma

Chung, Jae Wook; Ahn, Jae Hong; Lee, Sun Young

Abstract

PURPOSE: To evaluate the factors affecting foveal threshold measured by blue on yellow perimetry in moderate to severe open angle glaucoma.
METHODS
Fourteen eyes of 14 patients who were diagnosed as moderate to severe open angle glaucoma underwent macular threshold test of the Humphrey Field Analyzer using white and blue targets. The foveal threshold using white targets (white threshold) was more than or equal to 18 dB in all cases. The cases of foveal threshold using blue targets (blue threshold) less than or equal to 0 dB were defined as foveal sensitivity loss group (7 eyes) and those more than 0 dB as no foveal sensitivity loss group (7 eyes). Those of age, contrast sensitivity, visual acuity, refraction, mean deviation, pattern standard deviation, corrected pattern standard deviation, vertical and horizontal C/D ratio, foveal white threshold, intraocular pressure, any point within central 5degrees with sensitivity less than or equal to 0 dB in visual field test were statistically analyzed between the two groups.
RESULTS
Foveal white threshold and any point within central 5degrees with sensitivity less than or equal to 0 dB in visual field test showed significant difference between the two groups.
CONCLUSION
Foveal dysfunction represented as decrease in blue threshold is possibly related to the paracentral scotoma which means any point within central 5degrees with sensitivity less than or equal to 0 dB in moderate to severe open angle glaucoma. However, significant deficits in either visual acuity or white threshold were not presented.