[STATE OF VISION AND REFRACTION IN URBAN AND RURAL SCHOOLCHILDREN].
D000293:Adolescent; D002648:Child; D005123:Eye; D006801:Humans; D012029:Refraction, Ocular; D012030:Refractive Errors; D012423:Rural Health; D012572:School Health Services; D014586:USSR; D014787:Vision Tests
ADOLESCENCE; CHILD; REFRACTION, OCULAR; REFRACTIVE ERRORS; RURAL HEALTH; SCHOOL HEALTH; USSR; VISION TESTS
SOSTOIANIE ZRENIIA I REFRAKTSII U GORODSKIKH I SEL'SKIKH SHKOL'NIKOV.