Synopsis

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

Vitamin A (including the form vitamin A palmitate) is essential for maintaining healthy eyesight, with robust scientific evidence supporting its role in the visual cycle. Vitamin A is a component of rhodopsin, a protein in the retina that absorbs light and is necessary for scotopic (low-light) vision. Deficiency of vitamin A leads to night blindness, and in severe cases, can cause xerophthalmia and complete blindness. Numerous clinical and epidemiological studies have shown that vitamin A supplementation can prevent and treat symptoms of deficiency-related poor eyesight, particularly in populations at risk for malnutrition. The World Health Organization recognizes vitamin A supplementation as a key intervention to prevent blindness in children in areas where deficiency is prevalent. However, for individuals with adequate vitamin A intake, supplementation does not improve general vision or treat other causes of poor eyesight such as refractive errors or age-related macular degeneration. In summary, vitamin A is scientifically validated for preventing and treating poor eyesight due to deficiency, but not for improving vision in otherwise healthy, well-nourished individuals.

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