Two types of parafoveal spectral sensitivity.
D003118:Color Perception; D003119:Color Perception Tests; D006801:Humans; D008266:Macula Lutea / Q000502:physiology*; D010786:Photoreceptor Cells / Q000502:physiology; D012168:Retinal Pigments / Q000502:physiology; D013053:Spectrophotometry; D014792:Visual Acuity
D012168:Retinal Pigments