The role of the spectacle in the visual optics of the snake eye.
D000818:Animals; D005075:Biological Evolution; D003315:Cornea / Q000502:physiology; D005123:Eye / Q000033:anatomy & histology; D005143:Eyelids / Q000502:physiology*; D007076:Iguanas; D007908:Lens, Crystalline / Q000502:physiology; D009799:Ocular Physiological Phenomena; D012029:Refraction, Ocular; D012911:Snakes / Q000502:physiology*