Many of the symptoms of vitamin A deficiency, such as blindness and an increase in respiratory infections, are related to the role of vitamin A in:

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Vitamin A plays a key role in the maintenance of epithelial cells, which line the respiratory tract and other parts of the body. Deficiency in vitamin A can lead to increased susceptibility to respiratory infections and other health problems related to the breakdown of these cells. While vitamin A is involved in the synthesis of visual pigment, it is not the primary cause of blindness related to vitamin A deficiency. Additionally, vitamin A does not play a major role in blood clotting, hormone synthesis, or nephron synthesis.

Many of the Symptoms of Vitamin a Deficiency, Such as Blindness