Color-mixture functions at low luminance levels.
D003118:Color Perception; D003119:Color Perception Tests; D005403:Fixation, Ocular; D005425:Flicker Fusion; D006801:Humans; D008027:Light; D008266:Macula Lutea; D012160:Retina / Q000502:physiology*; D012168:Retinal Pigments / Q000502:physiology*
D012168:Retinal Pigments