Scotopic vision in colour-blinds

Vision Res. 1998 Nov;38(21):3387-90. doi: 10.1016/s0042-6989(97)00339-8.


Alleles causing colour-blindness are present in humans at non-negligible levels, and it is not yet understood how colour-blindness is maintained, since colour-vision probably provides a selective advantage, e.g. when foraging. We show that after dark-adaptation colour-blinds had lower light perception thresholds than colour-normals (0.44 log-units), which may give a selective advantage under scotopic conditions, which may offset the disadvantage that colour-blinds suffer during foraging.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Color Vision Defects / physiopathology*
  • Dark Adaptation*
  • Female
  • Humans
  • Male
  • Sensory Thresholds / physiology
  • Visual Perception / physiology*