title: Refractive problems in Northern natives.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001251:Astigmatism / Q000453:epidemiology; D002170:Canada; D002648:Child; D002675:Child, Preschool; D006306:Health Surveys; D006801:Humans; D007198:Indians, North American; D004930:Inuit; D008875:Middle Aged; D009216:Myopia / Q000453:epidemiology; D011305:Presbyopia / Q000453:epidemiology; D012030:Refractive Errors / Q000453:epidemiology*