Evidence supporting the use of: Vitamin A (retinyl not specified)
For the body system: Eyes

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Table of Contents

Synopsis

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

Vitamin A is scientifically validated as essential for eye health, particularly in its role in vision and the maintenance of the cornea and other ocular tissues. Retinoids, the family of compounds to which vitamin A belongs, are crucial for the production of rhodopsin, a photopigment found in the retina that is necessary for low-light (scotopic) vision. Deficiency in vitamin A is a well-established cause of night blindness and, in more severe cases, can lead to xerophthalmia, a spectrum of ocular manifestations including dryness, keratinization of the conjunctiva and cornea, and ultimately blindness if untreated. Supplementation with vitamin A has been shown in multiple clinical and epidemiological studies to reverse early symptoms of deficiency and reduce the risk of blindness, particularly in populations where deficiency is common. The World Health Organization, among others, recognizes vitamin A supplementation as a critical intervention to prevent childhood blindness and reduce mortality from measles and other infectious diseases. While adequate intake is vital for eye health, excessive supplementation can be toxic. In summary, the use of vitamin A to support the eyes is strongly grounded in scientific evidence and is a well-accepted intervention in both clinical and public health contexts.

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