Scotopic vision in colour-blinds

@article{Verhulst1998ScotopicVI,
  title={Scotopic vision in colour-blinds},
  author={Sarah Verhulst and Frans W. Maes},
  journal={Vision Research},
  year={1998},
  volume={38},
  pages={3387-3390}
}
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. 

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