Why is there a fovea in the human retina?
D000818:Animals; D000882:Haplorhini; D006801:Humans; D008027:Light; D008266:Macula Lutea / Q000502:physiology*; D012160:Retina / Q000098:blood supply / Q000502:physiology*; D012168:Retinal Pigments
D012168:Retinal Pigments