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材料与方法 1 调查对象 经整群随机抽样,对三原县城镇5所中学的2219名学生进行了视力及影响因素的现患调查。本次调查的视力减退者为已戴镜的近视患者及本次调查才发现的远视力减退、近视力正常,并用凹透镜能矫正至正常者。
MATERIALS AND METHODS 1 Subjects A random sample of 2221 students from 5 secondary schools in towns and cities of Sanyuan County were surveyed for visual acuity and influential factors. The vision loss in this survey for patients with myopia who have been wearing glasses and this survey found that far vision loss, near normal vision, and with a concave lens can be corrected to normal.