Vision survey in Himalayan area.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000531:Altitude; D001766:Blindness / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D005128:Eye Diseases / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008403:Mass Screening; D008875:Middle Aged