Sweet potatoes are incredibly rich in beta-carotene, the antioxidant responsible for the vegetable’s bright orange color. In fact, one cup of baked orange sweet potato with skin provides more than seven times the amount of beta-carotene that the average adult needs per day.

Beta-carotene is converted to vitamin A in your body and used to form light-detecting receptors inside your eyes.

Severe vitamin A deficiency is a concern in developing countries and can lead to a special type of blindness known as xerophthalmia. Eating foods rich in beta-carotene, such as orange-fleshed sweet potatoes, may help prevent this condition.

Studies have found that the anthocyanins they provide can protect eye cells from damage, which may be significant to overall eye health.

Source https://www.healthline.com/nutrition/sweet-potato-benefits#TOC_TITLE_HDR_5

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