Effects of yellow filters on visual acuity, contrast sensitivity and reading under conditions of forward light scatter
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Frank Eperjesi & Lillian Evangelica Agelis
- چاپ و سال / کشور: 2010
Description
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.
Graefes Arch Clin Exp Ophthalmol (2011) 249:709–714 DOI 10.1007/s00417-010-1488-5 Received: 16 April 2010 / Revised: 29 July 2010 / Accepted: 3 August 2010 / Published online: 25 August 2010
