Vitamin A deficiency.
D002675:Child, Preschool; D003906:Developing Countries; D005260:Female; D006801:Humans; D007194:India; D007223:Infant; D008297:Male; D009755:Night Blindness / Q000209:etiology*; D012307:Risk Factors; D014802:Vitamin A Deficiency / Q000150:complications*; D014985:Xerophthalmia / Q000209:etiology*