Birefringence and dichroism of photoreceptors.
D000042:Absorption; D000818:Animals; D001718:Birefringence; D007448:Invertebrates; D008027:Light; D009904:Optical Rotation; D055095:Optics and Photonics; D010786:Photoreceptor Cells / Q000502:physiology*; D012029:Refraction, Ocular; D012168:Retinal Pigments / Q000502:physiology; D014714:Vertebrates
D012168:Retinal Pigments