title: The epidemiology of vitamin A deficiency and xerophthalmia.
mesh_terms: D000349:Africa; D000367:Age Factors; D001208:Asia; D001766:Blindness / Q000209:etiology; D002489:Central America; D002648:Child; D002675:Child, Preschool; D003228:Conjunctiva / Q000473:pathology; D003315:Cornea / Q000473:pathology; D003906:Developing Countries; D004032:Diet; D006801:Humans; D007597:Jordan; D009755:Night Blindness / Q000209:etiology; D011502:Protein-Energy Malnutrition / Q000150:complications; D012160:Retina / Q000473:pathology; D012306:Risk; D012621:Seasons; D012737:Sex Factors; D012959:Socioeconomic Factors; D013020:South America; D014802:Vitamin A Deficiency / Q000150:complications*; D014944:World Health Organization; D014985:Xerophthalmia / Q000145:classification / Q000453:epidemiology* / Q000209:etiology / Q000401:mortality / Q000473:pathology / Q000517:prevention & control