The lens.
D000818:Animals; D002386:Cataract / Q000139:chemically induced / Q000209:etiology; D002387:Cataract Extraction; D000013:Congenital Abnormalities / Q000601:surgery; D006801:Humans; D007908:Lens, Crystalline / Q000002:abnormalities / Q000033:anatomy & histology / Q000196:embryology; D008722:Methods; D011183:Postoperative Complications; D011832:Radiation Injuries / Q000150:complications