Developed rough and scaly skin-explain the diagnosis

Stacy, a 3 year old, has developed rough and scaly skin during the last year. After clinical evaluation of her condition and her food intake, her physician suspects that she has a vitamin A deficiency. He believes that she should start eating more foods rich in vitamin A. Stacy’s mother is surprised at the doctor’s advice. She remarks. “Doctor, there ’s nothing wrong with her eyes!” How can the doctor explain the diagnosis?              

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