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为掌握我市中小学生视力的动态状况,保障中小学生视力健康,我们于1993年始对海阳市小学、初中、高中在校学生进行了视力监测,现将监测结果统计分析如下。1 资料与方法
In order to grasp the dynamic state of primary and middle school students’ eyesight in our city and to ensure the health of primary and secondary students, we began to monitor the eyesight of primary, middle and high school students in Haiyang in 1993. The statistical analysis of the monitoring results is as follows. 1 data and methods