近年来,中小学生视力低下现象普遍,已成为家长、学校和社会共同担忧的问题[1]。为了掌握代县中小学生的视力情况,为学校预防近视工作提供科学的理论依据,我们于2004年—2007年连续4年对我县5所中小学的在校学生进行了视力情 In recent years, the phenomenon of poor eyesight among primary and middle school students has become widespread, which has become a common concern for parents, schools and the community [1]. In order to grasp the visual acuity of primary and secondary school students on behalf of the county for the prevention of myopia in schools to provide a scientific theoretical basis, we in 2004 -2007 for 4 years in my county school primary and secondary school students were visually impaired