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保护青少年学生视力是学校卫生工作的重要部分之一。笔者对导致学生视力低下原因进行了调查。１ 调查对象与方法１．１ 对象 对１９９８年９月学生体检对检出的视力低下（对数视力＜５．０）１４３名学生，在同年级同班中再选出视力正常１５０名学生进行调查。１．２ 方法?
Protecting young students’ eyesight is an important part of school health work. The author of the reasons leading to low vision students conducted a survey. 1 Subjects and Methods 1.1 Subjects Visually Impaired (Logarithmic <5.0) of Students Exposed to Physical Examination in September 1998 143 Students Re-opt for Normal Vision 150 Students in Same Class of the Same Year . 1.2 method?