QUANTIFICATION OF CATARACT USING THE RETROILLUMINATION MODULE OF THE NIDEK EAS-1000 ANTERIOR SEGMENT ANALYSIS SYSTEM

Abstract

Cortical and posterior subcapsular (PSC) cataracts are best quantified by a retroillumination method. We have used the Nidek EAS-1000 camera system to document such cataracts and have investigated how variability from operator input may be minimised when analysing retroillumination photographs. We then used our method to quantify the reproducibility of (i) image analysis and (ii) the system as a whole. A total of 99 eyes from 70 patients with either cortical or posterior subcapsular cataracts were photographed twice at one session. The first set of images was analysed twice and the second set once only. Cataract was classified as a density at least 14 grey scale units (cct) greater than clea..