Vitamin A deficiency

Vitamin A is a fat-soluble vitamin that can be obtained from food or converted from carotene in the human body. It has a wide range of important physiological functions, such as maintaining dark vision, maintaining the integrity of skin and mucous membranes, and promoting growth and development. Vitamin A deficiency is a nutritional disorder caused by a lack of vitamin A in the body, which can lead to dry and flaky skin, dry eyes, night blindness, and poor growth and development. This disease is common in infants and young children, and its incidence decreases with age.