Synopsis

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

Vitamin A (often provided as mixed retinoids and carotenoids) is scientifically validated for its role in supporting eyesight, especially in preventing and treating conditions related to vitamin A deficiency. The most prominent ocular condition associated with vitamin A deficiency is night blindness (nyctalopia), which is a well-documented early symptom. Vitamin A is an essential component of rhodopsin, a photopigment in the retina that is critical for vision in low-light conditions. Multiple clinical studies and decades of research have established that supplementation with vitamin A can reverse night blindness and prevent more severe ocular complications such as xerophthalmia (dryness of the conjunctiva and cornea) and Bitot’s spots. The World Health Organization endorses vitamin A supplementation in populations at risk of deficiency to prevent blindness, particularly in children. However, it is important to note that while vitamin A is crucial for maintaining normal vision, there is limited evidence that supplementation improves eyesight in individuals who are not deficient or prevents common causes of poor eyesight such as refractive errors (nearsightedness, farsightedness). The benefits are primarily seen in the context of deficiency. Excessive supplementation can be toxic, so medical supervision is advised. Overall, there is strong scientific evidence supporting vitamin A’s role in eye health, particularly in deficiency-related visual impairment.

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