[Ocular refraction in school children in the lower grades of primary schools].
D000367:Age Factors; D001251:Astigmatism / Q000175:diagnosis; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D011044:Poland; D012030:Refractive Errors / Q000175:diagnosis* / Q000453:epidemiology; D012737:Sex Factors
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