Vitamin A Deficiencies

《英文msh詞典》Vitamin A Deficiencies
[入口詞] Vitamin A Deficiencies
[主題詞] Vitamin A Deficiency
[英文釋義] 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)