Frank Eperjesi1, Lillian Evangelica Agelis. 1. Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, B4 7ET, UK. f.eperjesi@aston.ac.uk
Abstract
BACKGROUND: Yellow filters are sometimes recommended to people with low vision. Our aim was investigate the effects of three commercial yellow filters on visual acuity and contrast sensitivity (with and without glare) and reading (without glare) under conditions of forward light scatter (FLS). METHOD: Fifty-five healthy subjects were assessed with Corning Photochromic Filters (CPFs) 450, 511 and 527 and a filter producing FLS. The effects on log MAR visual acuity, Pelli-Robson contrast sensitivity with and without glare, and reading (measured with MNRead charts) without glare were determined. RESULTS: Statistically significant differences were found between the overall effect of glare and between CPFs for visual acuity and contrast sensitivity. A gradual decline in visual acuity, contrast sensitivity and reading with increasing CPF absorption was noted. CONCLUSION: Effects of CPF450, 511, 527 on visual acuity, contrast sensitivity and reading under conditions of FLS were negative but not clinically significant.
BACKGROUND: Yellow filters are sometimes recommended to people with low vision. Our aim was investigate the effects of three commercial yellow filters on visual acuity and contrast sensitivity (with and without glare) and reading (without glare) under conditions of forward light scatter (FLS). METHOD: Fifty-five healthy subjects were assessed with Corning Photochromic Filters (CPFs) 450, 511 and 527 and a filter producing FLS. The effects on log MAR visual acuity, Pelli-Robson contrast sensitivity with and without glare, and reading (measured with MNRead charts) without glare were determined. RESULTS: Statistically significant differences were found between the overall effect of glare and between CPFs for visual acuity and contrast sensitivity. A gradual decline in visual acuity, contrast sensitivity and reading with increasing CPF absorption was noted. CONCLUSION: Effects of CPF450, 511, 527 on visual acuity, contrast sensitivity and reading under conditions of FLS were negative but not clinically significant.
Authors: Thomas J T P Van Den Berg; L J René Van Rijn; Ralph Michael; Christian Heine; Tanja Coeckelbergh; Christian Nischler; Helmuth Wilhelm; Günther Grabner; Martin Emesz; Rafael I Barraquer; Joris E Coppens; Luuk Franssen Journal: Am J Ophthalmol Date: 2007-07-25 Impact factor: 5.258