The prevention of blindness in the aged.
D000368:Aged; D001766:Blindness / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D002386:Cataract / Q000150:complications; D003930:Diabetic Retinopathy / Q000150:complications; D005131:Eye Injuries / Q000150:complications; D005901:Glaucoma / Q000150:complications; D006801:Humans; D002537:Intracranial Arteriosclerosis / Q000150:complications; D008403:Mass Screening; D012106:Research; D012162:Retinal Degeneration / Q000150:complications; D012164:Retinal Diseases / Q000150:complications