Age, the crystalline lens of the rudd and visual pigments.
D000375:Aging; D000818:Animals; D003624:Darkness; D005399:Fishes; D007908:Lens, Crystalline / Q000502:physiology*; D008027:Light; D012168:Retinal Pigments / Q000502:physiology*; D012621:Seasons
D012168:Retinal Pigments