title: Effects of yellow filters on visual acuity, contrast sensitivity and reading under conditions of forward light scatter.
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).
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  Effects of CPF450, 511, 527 on visual acuity, contrast sensitivity and reading under conditions of FLS were negative but not clinically significant.
authors.affiliation: Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, B4 7ET, UK. f.eperjesi@aston.ac.uk
authors.forename: Frank
authors.initials: F
authors.lastname: Eperjesi
authors.forename: Lillian Evangelica
authors.initials: LE
authors.lastname: Agelis
mesh_terms: D000293:Adolescent; D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology*; D005139:Eyeglasses; D005260:Female; D019466:Glare; D006801:Humans; D008027:Light; D008297:Male; D011932:Reading; D012542:Scattering, Radiation; D015354:Vision, Low / Q000503:physiopathology* / Q000628:therapy; D014792:Visual Acuity / Q000502:physiology*; D055815:Young Adult