Synopsis

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

Vitamin A is scientifically validated as essential for maintaining normal vision, and its deficiency is a well-established cause of poor eyesight, particularly night blindness. Vitamin A is a key component of rhodopsin, a protein in the retina that absorbs light and is necessary for scotopic (low-light) vision. Numerous clinical and epidemiological studies, including those summarized by the World Health Organization, have demonstrated that vitamin A supplementation can prevent and treat xerophthalmia (a spectrum of ocular manifestations resulting from deficiency, including night blindness and, in severe cases, blindness) in at-risk populations. Randomized controlled trials and supplementation programs in populations with vitamin A deficiency have led to significant reductions in the incidence of night blindness and other ocular complications. However, there is no evidence that vitamin A supplementation improves eyesight in individuals who already have adequate levels of the vitamin. Excess supplementation can be toxic and lead to hypervitaminosis A. In summary, vitamin A is critical for eye health and preventing certain forms of poor eyesight due to deficiency, but supplementation is only beneficial in those with insufficient intake or absorption.

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