维生素A(以下简称维A)是发育和维持人类生命所必需的,对促进生长、维持视功能、调节上皮组织的增殖和分泌以及生殖特别重要,人和动物缺乏维A可能引起一种缺乏综合征,导致许多疾病和死亡,这是早在古代就为人们所熟知的。但是由于家长缺乏合理应用维A的知识及医务人员缺乏警惕性,尤其是婴儿和儿童对摄入大量维A较成人更为敏感。因 Vitamin A (hereinafter referred to as vitamin A) is necessary for the development and maintenance of human life, to promote growth, maintain visual function, regulation of epithelial tissue proliferation and secretion and reproduction is particularly important, human and animal lack of dimension A may cause a lack of synthesis Levy, leading to many diseases and death, which is well known in ancient times. However, due to the lack of knowledge of parents and the lack of vigilance among medical staff, infants and children are especially more likely to be exposed to large amounts of vitamin A than adults. because