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维生素A和维生素D是两种人体必需的营养素。体内一旦缺乏这两种维生素会产生各种临床症状，因此补充足够剂量的维生素A和维生素D不仅能改善因缺乏所产生的症状和体征，而且近年来许多新的研究表明它们还可能预防和治疗许多疾病。维生素A缺乏症状、体征维生素A缺乏首先累及眼睛?
Vitamin A and Vitamin D are two essential nutrients for the body. In the absence of these two vitamins in the body can produce a variety of clinical symptoms, so adequate doses of vitamin A and vitamin D not only can improve the symptoms and signs of deficiency, but also in recent years, many new studies have shown that they may prevent and treat Many diseases Vitamin A deficiency symptoms, signs of vitamin A deficiency involving the eyes first?