Energy, quanta and Limulus vision.
D000200:Action Potentials; D000818:Animals; D001181:Arthropods / Q000502:physiology*; D003623:Dark Adaptation; D009900:Optic Nerve / Q000502:physiology; D010775:Photic Stimulation; D010783:Photometry; D011789:Quantum Theory; D012168:Retinal Pigments; D013045:Species Specificity; D014785:Vision, Ocular
D012168:Retinal Pigments