About the photopigments of colour vision.
D000042:Absorption; D000818:Animals; D003118:Color Perception; D006801:Humans; D008027:Light; D010777:Photochemistry; D010786:Photoreceptor Cells / Q000502:physiology; D012168:Retinal Pigments; D013053:Spectrophotometry; D014801:Vitamin A
D012168:Retinal Pigments; D014801:Vitamin A