A cataract is a clouding of the lens within the eye. A clear lens in the eye focuses light. This lets the eye see images sharply. With age, the lens slowly becomes cloudy. The cloudy lens is a cataract. A cataract scatters light and makes it hard for the eye to focus. Cataracts often form in both eyes, but one lens may cloud faster than the other.
Online Medical Reviewer: Chomsky, A, MD
Online Medical Reviewer: Haines, Cynthia, MD
Online Medical Reviewer: Townsend, J, OD
Date Last Reviewed: 05/01/2020
© 2000-2026 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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