title: Effect of luminance on color perception of protanopes.
abstract: Small-field color-naming performance of two protanopes over a 4-log luminance range was impoverished in comparison with that of normal trichromats, and was more strongly affected by changes in luminance. At 200 cd/m2 responses to mid-spectral lights were dominated by 'yellow'; with lowering luminance, 'green' and 'red' were increasingly used. In the color spaces derived from these data the first two dimensions for trichromats are red-green and yellow-blue: those of the protanopes appear to be brightness and 'red-blue'. In the protanopes' color space the greater separation of stimuli at 0.2 cd/m2 suggests that with low luminance their color discrimination improves.
authors.affiliation: Institut für Arbeitsphysiologie, Universität Dortmund, Germany.
authors.forename: G V
authors.initials: GV
authors.lastname: Paramei
authors.forename: D L
authors.initials: DL
authors.lastname: Bimler
authors.forename: C R
authors.initials: CR
authors.lastname: Cavonius
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology*; D003117:Color Vision Defects / Q000503:physiopathology*; D004192:Discrimination, Psychological; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D008297:Male; D013053:Spectrophotometry