Scotopic contrast hues triggered by rod activity.
D000221:Adaptation, Ocular; D003118:Color Perception; D003124:Colorimetry; D003623:Dark Adaptation; D005584:Fovea Centralis / Q000502:physiology; D006801:Humans; D010786:Photoreceptor Cells / Q000502:physiology*; D014792:Visual Acuity