The accommodative significance of the "ramp" retina of the eye of the stingray.
D000065:Accommodation, Ocular; D000758:Anesthesia; D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D007908:Lens, Crystalline / Q000033:anatomy & histology; D011680:Pupil / Q000502:physiology; D012029:Refraction, Ocular; D012160:Retina / Q000033:anatomy & histology*