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A person is said to have cataracts when the crystalline lens in their eyes clouds, causing blurred vision or difficulty seeing.



Cataracts are not a film on the cornea. Rather they affect one of the eye's structure called the crystallin. The crystallin is the lens of the eye, much like the lens of a camera. Usually the crystallin is transparent and enables the eye to clearly focus on objects both near and far. However, it can become cloudy and cause images to appear blurred. Over time, it can also become opaque and completely block vision in the affected eye. That's what we call a cataract. Cataracts are the third cause of blindness in North America. They are not contagious from eye to eye. However, people who have a cataract in one eye usually end up having cataracts in both eyes.
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