Objective: To investigate the impacts of eye care habits and vision burden on myopia among primary and high school students.
目的：了解中小学生用眼习惯与负担，探讨这些因素对近视的影响。
AIM: to assess the prevalence of refractive errors in middle school students in Lanzhou city and explore the risk factors for myopia.
目的：调查兰州市中学生屈光不正的发病率并探讨近视发病的危险因素。
Provincial prevalence of myopia increased from primary to high school continued the same trend.
各省市近视患病率从小学到高中不断增高趋势一致。
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