title: An epidemiological study of ocular condition among primary school children of Calcutta Corporation.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005128:Eye Diseases / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D012029:Refraction, Ocular; D012959:Socioeconomic Factors