Influence of Media Opacities on Perimetric Threshold Values using W/W, B/Y, HRP, FDT and Flicker Perimetry

Abstract

Abstract: : Purpose: We investigated the influence of media opacities on perimetric threshold values using 5 kinds of different types of perimetry. Methods: Ten eyes of 10 normal subjects and 27 eyes of 20 cataract patients were tested using white on white perimetry (W/W), blue on yellow perimetry (B/Y), high-pass resolution perimetry (HRP), frequency doubling technology (FDT) and flicker perimetry using octopus 1-2-3. In W/W perimetry, stimulus sizes 1, 3 and 5 were also used for normal subjects. Six kinds of occlusion diffuser were used for normal subjects in order to simulate the media opacities. Results: Using W/W, B/Y, HRP and FDT, the perimetric threshold values were significantly decreased depending on the degree of the density of the occlusion diffusers. However, the CFF values of the flicker perimetry were not affected by the occlusion diffusers. In cataract patients, perimetric threshold values were also significantly decreased depending on their corrected visual acuity except for flicker perimetry. Conclusions: All perimetric methods which change the contrast of the test target for detecting the threshold were affected by media opacities. The CFF values of the flicker perimetry were the least effected by media opacities.

Keywords: visual fields • perimetry • cataract