Researchers at the University of Maryland, according to the Archives of Internal Medicine (140:1269), have found that, in vitamin C deficiency, exposure to light of no greater intensity than that required for reading produces a damaging chemical in the lens of the eye. The photochemical end product, a superoxide, is closely akin to ozone, which can damage any living tissue.
Since the lens has no blood vessels (which would deprive it of transparency), locally made superoxides, unable to be carried away by the circulation, accumulate and have a more than usually damaging effect. Accumulation in the lens alters its chemical nature, making it less transparent, and thereby produces a cataract and blindness. The research strongly suggests that, by taking extra vitamin C, we can help prevent blindness due to cataracts. Cataracts have many causes, but this could be the most common one in people with poor nutrition.
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