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. 2005 Dec;113(12):A822–A827. doi: 10.1289/ehp.113-a822

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Clouding our vision. — Cataract, the leading cause of blindness worldwide, arises from a combination of factors including genetics, age, and environmental exposures. Though largely treatable, poor access to health care leaves many around the world to suffer. (Top to bottom) An acute sudden-onset cortical cataract in a person with type 1 diabetes; a hypermature age-related cataract; a white congenital cataract.