title: The effect of decreased visual acuity on clinical color vision testing.
abstract: OBJECTIVE
  Evaluate the effect of visual acuity on color vision testing.
  
  
  METHODS
  University based clinical experimental study.
  
  
  METHODS
  Right eyes of 12 healthy subjects were fogged with plus lenses to logMAR 1.88 and assessed with D-15 panel, Ishihara, and Hardy-Rand-Rittler (HRR) plates. Subjects were tested at lesser degrees of fogging, 0.1 logMAR intervals. The acuity at which 5% of the population tests abnormally was estimated as follows. The average acuity at which a 10% reduction in correct responses occurred was determined. From this, two standard deviations were subtracted. Examination devices were compared using repeated measures analysis of variance.
  
  
  RESULTS
  Color vision testing did not significantly differ from baseline up to logMAR 1.40 (D-15 panel), 1.10 (HRR plates), and 0.72 (Ishihara plates). Testing devices were significantly different (P < .005).
  
  
  CONCLUSIONS
  Color vision testing is accurate up to logMAR 1.40 (20/501) with D-15 panel, 1.10 (20/252) with HRR plates, and 0.72 (20/106) with Ishihara plates.
authors.affiliation: Stanford University School of Medicine, Department of Ophthalmology, 900 Blake Wilbur Drive, Room W-3074, Stanford, CA 94305, USA. mcculley@stanford.edu
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: McCulley
authors.forename: Karl C
authors.initials: KC
authors.lastname: Golnik
authors.forename: Byron L
authors.initials: BL
authors.lastname: Lam
authors.forename: William J
authors.initials: WJ
authors.lastname: Feuer
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology*; D003119:Color Perception Tests; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014792:Visual Acuity / Q000502:physiology*