Oranges are high in vitamins C, E, and A, as well as carotenoids, all of which contribute to healthy eyes. Vitamin C maintains healthy blood vessels in the body and protects ocular cells in the eye. Vitamin C also plays an important role in connective tissue maintenance, especially that of collagen in the eye's cornea. One study found that simply eating one orange per day over a period of several years helped reduce the risk of age-related eye conditions.

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