近年来在对学生进行体检的过程中发现，学生的视力减退情况较为严重，并有随学年的增加其视力减退发生率亦逐渐增加的趋势。现将沛县部分学校的资料统计分析如下：1资料来源和方法本文资料系该县15所中学和15所小学的健康体检资料，采用对数视力表灯箱进行远视力检查。2结果与 In recent years during the physical examination of students found that students have a more serious vision loss, and with the increase in school year the incidence of visual acuity also gradually increased trend. Statistics of some schools in Peixian now are as follows: 1 Data sources and methods The data in this paper is based on the physical examination data of 15 middle schools and 15 primary schools in the county. 2 results with