Synopsis

Source of validity: Scientific
Rating (out of 5): 5

Vitamin A (retinol) is scientifically validated as essential for healthy eyesight, particularly for its role in preventing and treating night blindness and other ocular disorders related to vitamin A deficiency. Vitamin A is a crucial component of rhodopsin, a protein in the retina that absorbs light and is necessary for scotopic (low-light) vision. When dietary intake of vitamin A is insufficient, the earliest symptom is often night blindness, progressing to more severe eye conditions such as xerophthalmia and, eventually, total blindness if not corrected. Numerous clinical studies and global health authorities, including the World Health Organization (WHO), recognize vitamin A supplementation as an effective intervention to prevent and treat vitamin A deficiency-related ocular diseases. Historical evidence also supports its use: cod liver oil, rich in vitamin A, has been used since the 18th and 19th centuries to treat various visual complaints. However, for common vision problems like myopia or age-related macular degeneration not associated with deficiency, vitamin A supplementation has not been shown to provide benefits. Overall, there is robust scientific evidence linking vitamin A to the prevention and treatment of eyesight issues specifically caused by deficiency, making its use justified and evidence-based in these contexts.

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