Synopsis

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

Vitamin A plays a critical role in maintaining eye health, particularly in the function of the retina and the maintenance of conjunctival membranes and corneal surfaces. Deficiency in vitamin A is a well-established cause of xerophthalmia, which can manifest as dryness, redness, and itching of the eyes, and can progress to more severe conditions such as night blindness and even blindness if left untreated. Numerous studies and reviews, including those by the World Health Organization (WHO), have demonstrated that vitamin A supplementation can reverse or prevent these symptoms in individuals with vitamin A deficiency. The therapeutic use of vitamin A for red or itching eyes is thus primarily indicated in cases where deficiency is present or strongly suspected. For individuals with normal vitamin A status, there is no high-quality evidence that supplementation improves symptoms of red or itching eyes related to other causes (such as allergies or infection). In summary, vitamin A is scientifically validated for the prevention and treatment of eye symptoms related to its deficiency, and this use is well supported by clinical and epidemiological data.

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