Cataract, MedlinePlus, National Library of Medicine, National Institutes of Health, U.S. Department of Health & Human Services. This website provides links to detailed information on cararact, a condition involving a clouding of the lens in the eye, impairing vision. This condition that is very common in older people. ” By age 80, more than half of all people in the United States either have a cataract or have had cataract surgery.”
