AIM: To investigate on myopia and related influencing factors between adolescents aged 6-18 years in Chengdu and Mianyang Area of Sichuan Province.

METHODS: This cross-sectional stratified sampling study collected 4 071 students aged 6-18 years from October 2017 to May 2018 in Chengdu and Mianyang City of Sichuan Province. All students underwent ocular examination and performed questionnaire survey.

RESULTS: Totally 3 857(94.74%)students were participated in this study with a mean age of 11.86±3.43 years. The prevalence rate of myopia and high myopia students were 61.21% and 3.89%, respectively. The prevalence rate of myopia students were 12.05% in the 6-year-old group and 86.15% in the 18-year-old group. Prevalence rates of students with uncorrected and presenting VA≤4.7 in the better eye were 42.88%, 12.37%, respectively. Among all students, 48.07% were wearing glasses. In multivariate Logistic regression analysis, age, parental myopia, near work, using electronic equipment were the risk factors for myopia, outdoor activities was protective factors.

CONCLUSION: The main reason for the low vision of school children in Chengdu and Mianyang Area in China is myopia. Prevalence rate of myopia students is gradually increasing with the growing of age. Myopia was associated with age, parental myopia, near wok, using electronic equipment and outdoor activities.