视力不良是小学生的常见病，为进一步了解小学生视力不良状况及探索其变化规律和为近视防治工作提供科学依据。我们于１９９３～１９９７年对城乡５所小学共７３８名学生的视力状况从二年级开始至六年级连续５年进行追踪调查观察，现将结果分析报告如下：１材料来源和方法... Poor eyesight is a common disease for primary school students, in order to further understand the poor vision of primary school students and explore its changing patterns and provide a scientific basis for prevention and treatment of myopia. From 1993 to 1997, we surveyed 738 students in 5 primary schools in urban and rural areas from the second grade to the sixth grade for five consecutive years. The results of the analysis are as follows: 1 Source of materials and methods ...