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 is important for maintaining the health of epithelial cells, including those in the eyes and respiratory tract. Deficiency can cause blindness and increased susceptibility to respiratory infections. Vitamin K is the vitamin involved in blood clotting, vitamin A is involved in synthesis of visual pigment, and vitamin D is involved in synthesis of some hormones. Vitamin A is important for maintaining the health and function of epithelial cells, which line the respiratory, digestive, and urinary tracts, as well as the skin and eyes. Deficiency can lead to increased susceptibility to respiratory infections and damage to the eyes, including blindness. Vitamin A is not involved in blood clotting, synthesis of visual pigment, or synthesis of hormones.

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