Telephoto lens system of falconiform eyes.
D000818:Animals; D001717:Birds / Q000502:physiology*; D005584:Fovea Centralis / Q000033:anatomy & histology / Q000502:physiology; D007908:Lens, Crystalline / Q000502:physiology; D012160:Retina / Q000033:anatomy & histology / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity