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为了解我校学生视力的变化情况，连续收集1993～1995年视力监测资料分析如下。1对象与方法1.1对象选择1993年入学的初一年级四个班和高一年级2个班，连续三年视力监测资料完整者，初中生193人（男90人，女103人），占原入学人数的95．07％，高中生87人（男49人，女38人），占原
In order to understand the change of visual acuity of our school students, we continuously collected visual acuity data from 1993 to 1995 as follows. 1 Subjects and Methods 1.1 Object Selection 1993 enrollment of the first grade four classes and the first grade two classes, visual acuity monitoring data for three consecutive years complete, 193 junior high school students (90 males and 103 females), accounting for the original 95.07% of enrollment, 87 high school students (49 males and 38 females), accounting for the original