CLINICAL RETINOTOPY OF THE OPTIC NERVE HEAD

Vikas Gulati

Abstract

PURPOSE. To evaluate the correlation between visual thresholds on automated 30-2 fields and HRT II stereometric parameters and to develop a clinical correspondence map between optic nerve head sectors and visual fields. METHOD. In a cross-sectional study, right eye of 50 consecutive primary open-angle glaucoma cases underwent full threshold 30-2 visual fields on Humphrey visual field analyzer and their optic nerve heads were imaged using a scanning laser ophthalmoscope (HRT II). The correlation between the stereometric parameters in individual disc sectors and visual thresholds was analyzed to generate a correspondence map between the optic disc and the visual field.

RESULTS. Rim/disc area ratio and cup/disc area ratio correlated with the visual thresholds at the highest number of points in the visual fields. Thresholds at the superior hemifield locations correlated best with the rim/disc area ratio and cup/disc area ratio in the inferonasal sector and the ones in the inferior hemifield correlated best with the rim/disc area ratio and cup/disc area ratio in the superotemporal sector. Optic disc parameters correlated better with inferior field locations and non-edge points than superior field locations and edge points.

CONCLUSIONS. Glaucomatous damage in the superotemporal and inferonasal disc sectors may be clinically more significant than the others. Rim/disc area ratio and cup/disc area ratio measurements on HRT II have a good correlation with visual field damage seen on automated visual fields.

Details

Year: 2001

Program Number: Poster 80

Author Affiliation: All India Institute of Medical Sciences

Co-Authors: Ramanjit Sihota, Harish Agarwal, Rohit Saxena, Ajay Sharma

Co-Author Affiliation: All India Institute of Medical Sciences, All India Institute of Medical Sciences, All India Institute of Medical Sciences, All India Institute of Medical Sciences

Room: Exhibit Hall C