A nutritional condition produced by a deficiency of vitamin a in the diet, characterized by night blindness and other ocular manifestations such as dryness of the conjunctiva and later of the cornea (xerophthalmia). Vitamin a deficiency is a very common problem worldwide, particularly in developing countries as a consequence of famine or shortages of vitamin a-rich foods. In the United States it is found among the urban poor, the elderly, alcoholics, and patients with malabsorption. (from cecil textbook of medicine, 19th ed, p1179)
Condition due to a deficiency of vitamin a.
Deficiency of vitamin a due to malnutrition, malabsorption, or dietary lack. It is manifested with reduced night vision, night blindness, and xerophthalmia.