The Inspection for the Clinical Usefulness of the Pericecal Index in Early Glaucoma Automated Visual Fields

ABSTRACT

Many visual field indices have been used for the rapid, precise evaluation of the Humphrey automated visual field. The clinical usefulness of Pericecal Index(PI), the mean sensitivity of 11 test points around the blind spot, was studied in the diagnosis of early glaucoma. PI was calculated in 60 eyes with low tension glaucoma(LTG)[mean defect<10dB], 60 eyes with early visual field change[general reduction of sensitivity(GRS)] and in 60 normal eyes. The difference between glaucomatolls eyes and normal eyes was statistically significant(p<0.01). And also compared PI with the mean sensitivity of 11 control points, located at same eccentricity in lower field and used this as the Control Area(CA). More over, the mean sensitivity of these points in glaucomatous and normal eyes was compared. The difference between PI and CI was only statistically significant in glaucomatolls eyes. On the other hand, We found a significant difference between normal and glaucomatolls control points. Thus we concluded that PI can be the useful visual field indix for the diagnosis of early glaucoma.