Abstract: Objective To understand the current situation of poor vision in primary and middle school students aged 6-18 in Zigong City, so as to provide reference information for formulating targeted prevention and control measures. Methods A stratified cluster sampling method was used to sample 3 primary schools and 4 middle schools （including 2 junior high schools, 1 general senior high school and 1 vocational high school） in each of 2 urban areas and 1 township in Zigong City. All primary and middle school students in the selected schools were examined for vision and investigated by questionnaire. The poor vision of primary and middle school students was analyzed by descriptive epidemiological analysis method, and its influencing factors were analyzed by univariate and multivariate analysis. Results A total of 11 992 primary and middle school students in Zigong City were surveyed, aged 6-18 years, with a male-female ratio of 1.12∶1. Among them, 6 715 cases of poor vision were detected, with a detection rate of 55.99%. The results of multivariate analysis showed that sleep time <8 h/d （OR=2.757）, older age （OR=2.654）, urban students （OR=3.152）, using electronic equipment ≥2 h/d （OR=3.062）, the risk of poor vision in primary and middle school students was higher. The school organized vision screening every year （OR=0.389）, physical exercise time was 1-2 h/d （OR=0.614）, and the school organized vision protection publicity activities every year （OR=0.407）, the risk of poor vision in primary and middle school students was relatively low. Conclusion The detection rate of poor vision among primary and middle school students aged 6-18 in Zigong is high, which is mainly related to age, location, sleep time, physical exercise time, the annual vision screening organized by the school, the use of electronic equipment, the annual vision protection publicity activities carried out by the school, etc. It is suggested that the school and relevant departments should pay attention to it, and take measures to ensure the healthy development of vision of primary and middle school students.

Key words: Primary and middle school students, Poor vision, Eye behavior, Influencing factor