Cataracts

"A cataract is a cloudiness of the eye's natural lens, which lies between the front and back areas of the eye, directly behind the pupil. 

 

Most cataracts develop slowly over time and affect people over age 50. About half of the U.S. population has a cataract by age 65, and nearly everyone over age 75 has at least a mild cataract in one or both eyes. In rare cases, infants can have congenital cataracts. These usually are related to the mother having German measles, chickenpox, or another infectious disease during pregnancy; but sometimes they are inherited. 

 

Mild cataracts often cause little or no vision problems. Your doctor is probably monitoring your cataract to see if it worsens and more significantly affects your vision or lifestyle before recommending surgery. Some cataracts never reach the stage where they need to be removed. But if your cataract worsens and you begin to have trouble seeing clearly for driving and other everyday tasks, it's probably time to consider cataract surgery.

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Source - All About Vision