title: The role of environmental factors in cataract, pterygium and trachoma.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D001955:British Columbia; D002386:Cataract / Q000453:epidemiology*; D002648:Child; D004777:Environment; D005007:Ethnology; D006306:Health Surveys; D006801:Humans; D007194:India; D008875:Middle Aged; D011625:Pterygium / Q000453:epidemiology*; D014141:Trachoma / Q000453:epidemiology*