Cataracts by the Numbers

According to the Mayo Clinic, about half of all 65-year-old Americans and an even higher percentage of people in their seventies have some degree of cataracts. A cataract can be relatively mild or severe. In the latter case, it will block the passage of light to the retina, causing significant vision problems. A cataract usually develops slowly and painlessly, so vision can be affected without the sufferer realizing it.

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