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The lens of an eye is normally clear. If the lens becomes cloudy (opacified) it is called a cataract.

Review Date 8/15/2017

Updated by: Franklin W. Lusby, MD, ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Editorial update 12/28/2017.