初中学生的视力发育还不完善 ,他们的学习任务繁重 ,近距离连续用眼时间较长 ,学生的视力低常问题愈显严重 ,为了解和掌握影响我区各民族中学生视力低常的原因 ,为视力保健提供科学依据。我们对 43 68例中学生进行调查研究。对象及方法1 调查对象　对铜仁市有代表性的 5所民族 Junior high school students ’visual acuity development is still not perfect, their learning tasks are heavy, the continuous use of eyes for a long time, students’ low vision problems become more serious, in order to understand and master the low vision of our students in all ethnic groups, Provide scientific basis for visual health care. We conducted a survey of 43 68 middle school students. Subjects and methods 1 respondents 5 representative Tongren City