Abstract: Objective To understand the occurrence and influencing factors of poor eyesight among primary and middle school students in Nansha District of Guangzhou, so as to provide reference for the prevention and control of poor eyesight. Methods By stratified cluster sampling method, students of 7 schools including primary and middle schools from Nansha District of Guangzhou were selected and investigated. Results A total of 1 861 questionnaires were distributed, and 1 842 valid questionnaires were collected, with an effective recovery rate of 98.98%. The detection rate of poor eyesight among primary and middle school students in Nansha District of Guangzhou was 63.63%, the detection rate of boys, junior high school students and boarding students was 59.51%, 82.50% and 76.53%, respectively. There were significant differences in the detection rate of poor eyesight among different gender, schooling grade and boarding situation （all P<0.01）. Multivariate Logistic regression analysis showed that junior high school and above （OR=3.32, 3.19）, girls （OR=1.42）, using mobile electronic devices every day （OR=1.39）, insufficient sleep （OR=1.52）, duration of homework ≥ 2 hours （OR=1.50, 2.05）, duration of close-range use of eyes ≥ 16 minutes （OR=1.48, 1.40, 1.47, 1.75, 2.15）, and parental myopia （OR=2.05, 2.01, 3.30） were risk factors for poor eyesight of primary and middle school students. Conclusion The poor eyesight of primary and middle school students in Nansha District of Guangzhou is severe, it requires the joint efforts of schools, families and society to prevent and control the poor eyesight of students.

Key words: Poor eyesight, Student, Influencing factor, Life behavior