The effect of decreased visual acuity on clinical color vision testing

Timothy J. McCulley, Karl C. Golnik, Byron L. Lam, William J. Feuer

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


PURPOSE: Evaluate the effect of visual acuity on color vision testing. DESIGN: 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.

Original languageEnglish (US)
Pages (from-to)194-196
Number of pages3
JournalAmerican journal of ophthalmology
Issue number1
StatePublished - Jan 2006

ASJC Scopus subject areas

  • Ophthalmology


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