title: Effect of quality of illumination and distance of observation upon performance in the Ishihara test.
authors.forename: D
authors.initials: D
authors.lastname: VOLK
authors.forename: G A
authors.initials: GA
authors.lastname: FRY
mesh_terms: D003117:Color Vision Defects; D006801:Humans; D008027:Light; D008029:Lighting
keywords: COLOR BLINDNESS/tests