Evidence supporting the use of: Vitamin A (unspecified)
For the health condition: Eyesight (poor)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Vitamin A is scientifically validated as essential for maintaining healthy eyesight, particularly in the context of night vision and the prevention of certain eye disorders. The active form of vitamin A, retinal, is a critical component of rhodopsin, a protein in the retina that absorbs light and is necessary for scotopic (low-light) vision. Deficiency in vitamin A is a well-documented cause of night blindness (nyctalopia) and, in more severe cases, can lead to xerophthalmia, a spectrum of eye conditions that can result in irreversible blindness if untreated. Numerous clinical studies and public health data have established that vitamin A supplementation in deficient populations reduces the incidence of blindness and visual impairment, particularly in children.

However, in individuals with adequate vitamin A intake, supplementation has not been shown to further improve vision or prevent common age-related eye conditions such as macular degeneration or cataracts. The World Health Organization and numerous national health agencies recommend vitamin A supplementation primarily to prevent deficiency in at-risk groups, such as children in developing countries. Thus, the use of vitamin A for supporting eyesight is grounded in robust scientific evidence, but primarily as a preventive measure against deficiency-related vision problems rather than as a general enhancer of eyesight.

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