[Assessment of the demand for single-focus eyeglass lenses].
D000367:Age Factors; D001251:Astigmatism / Q000453:epidemiology / Q000628:therapy; D005139:Eyeglasses / Q000600:supply & distribution*; D006301:Health Services Needs and Demand; D006801:Humans; D012030:Refractive Errors / Q000453:epidemiology / Q000628:therapy; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014586:USSR
K otsenke potrebnosti v odnofokal'nykh ochkovykh linzakh.