AIM: To analyze the situations of poor vision and the incidence of myopia in adolescents of Chifeng and to explore the factors that affect the occurrence of myopia.

METHODS: A multi-stage random sampling method was adopted from September to December in 2019. A total of 2 070 students from primary 4^th grade to junior in high school in Chifeng were selected for questionnaire surveys and visual inspections to analyze influencing factors and the occurrence of myopia in the region.

RESULTS: Among 2 070 students in this research, the incidence of poor vision was 56.96% and the incidence of myopia was 52.22%. Multivariate Logistic regression analysis showed that the risk factors of myopia were senior grade, female, genetic history, loving to eat sweets, fried food, no breakfast, longer time homework and cram school, using mobile devices, having bad eye habits and using eyes for long time once. The protective factors of myopia were no other poor vision, eating fresh fruits, adjusting the height of tables and chairs, doing eye exercises, doing outdoor activities between classes, a one-foot sitting posture, supervising the sitting posture by parents and teachers, less watching TV, increasing outdoor exercise and sleeping time.

CONCLUSION: The myopia incidence of adolescents in Chifeng is generally higher. We should actively pay attention to the personal situation of students, improve visual environment inside and outside school, correct bad visual habits, and increase outdoor exercise and sleep time.