Abstract: Objective To examine the association between classroom illumination and students' vision,and to provide theoretical basis and support for prevention of students' vision.Methods A total of 67 classrooms in three representative schools in Tianjin were selected by stratified cluster random sampling method.The examination of classroom illumination was carried out,and 1 494 students in the classroom were screened for poor eyesight.The rank correlation was used to analyze the relationship between classroom lighting and students' average visual acuity in class preliminarily.Results The qualification rate of average illumination of desk and blackboard were relatively higher,which were 85.07% and 70.15%,respectively.However,the qualification rate of the uniformity of blackboard illumination was only 52.24%.The average illumination of the desk in the primary classroom was higher than that of the junior middle school and the high school (P<0.01),but there was no significantly statistical difference between junior high school and high school (P=0.792).There was only a positive correlation between the average visual acuity of the class and the average illumination of the desk (r=0.688,P<0.01) in primary school.No correlation was found between the average visual auity of the class average illumination in middle and high schools(P<0.05).Conclusion The light environment of classroom may be more likely to have an impact on pupils' visual acuity.Schools and other relevant departments should pay attention to the status of classroom lighting,and create a qualified classroom lighting environment for the primary and secondary students.