Just like tree sap you can't get off your car's windshield, a cataract is a milky-colored protein buildup on the lens of the eye. More than half of people will have cataracts by age 80. They can seriously affect vision, but, fortunately, surgery easily removes them in most cases.
Source:http://www.realage.com/check-your-health/eye-health/cataract
Source:http://www.realage.com/check-your-health/eye-health/cataract
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