The lens of an eye is normally clear. If the lens becomes cloudy (opacified) it is called a cataract.
Update Date 8/24/2013
Updated by: Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.