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I don't know how vitamin A improves eyesight, but lack of vitamin A is the main cause (70%) of childhood blindness throughout the world, with 500,000 going blind every year due to lack of vitamin A. The amount of vitamin A required to prevent blindness is small.
First answer by Bmacior. Last edit by Bmacior. Contributor trust: 70 [recommend contributor]. Question popularity: 15 [recommend question]
Answers.com > Wiki Answers > Categories > Health > Nutrition > How does vitamin A improve eyesight?
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