title: Is color vision deficiency an advantage under scotopic conditions?
abstract: OBJECTIVE
  To examine experimentally whether color vision deficiency confers a selective advantage under scotopic conditions.
  
  
  METHODS
  Red-green color-deficient subjects, monochromats, and age-matched color-normal control subjects were examined. In each subject the time course of dark adaptation, scotopic visual field sensitivity, and performance on a scotopic perceptual task were measured.
  
  
  RESULTS
  No significant differences were found between red-green color-deficient subjects and control subjects on any of the three tests. Our small sample of monochromats had higher absolute thresholds than the corresponding control subjects, but their performance at the scotopic visual field test and perceptual task did not differ significantly from that of color-normal subjects.
  
  
  CONCLUSIONS
  No evidence was found that red-green color deficiency or monochromatism confers a selective advantage under scotopic conditions.
authors.affiliation: Department of Experimental Psychology, Cambridge University, Cambridge, United Kingdom. m.p.simunovic@apu.ac.uk
authors.forename: M P
authors.initials: MP
authors.lastname: Simunovic
authors.forename: B C
authors.initials: BC
authors.lastname: Regan
authors.forename: J D
authors.initials: JD
authors.lastname: Mollon
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003117:Color Vision Defects / Q000503:physiopathology*; D003623:Dark Adaptation / Q000502:physiology*; D006801:Humans; D012016:Reference Values; D014787:Vision Tests; D014785:Vision, Ocular; D014794:Visual Fields