为了解中小学生视力及近视学生的戴镜情况1999年进行了调查。调查采用整群抽样法 ,选择山亭城区及桑村部分中小学校中 7～ 18岁学生为调查对象。采用“Ｅ”字形单个视标显示的对数灯光视力表进行检查 ,视力低于 5 0者为视力低下。同时检查屈光度 ,对屈光度在 - 1 5Ｄ以上学生的 In order to understand the vision of primary and secondary students and students wearing glasses in 1999 conducted a survey. In the survey, a cluster sampling method was used to select 7 to 18-year-old students in Shanting City and Sangchun primary and secondary schools as the survey subjects. The use of “E” -shaped single visual display of the visual acuity chart to check the light, visual acuity of less than 50 were low vision. At the same time check the diopter, on the diopter - 1.5D above students