AIM:To investigate the influencing factors for the degree of myopia in the primary and middle school students in Pudong district of Shanghai.

METHODS:A cross-sectional survey was conducted among 3 295 students in Pudong district from September to October in 2014. These students had been given vision examination and finished a questionnaire survey. Data of the survey was analyzed with rank-sum test and ordinal logistic regression analysis.

RESULTS: Single factor analysis showed that there was statistical relation on degree of myopia with the grade, myopia in parents. Although there was no statistical difference between the genders, degree of myopia was different between boys and girls in different grades. There was no statistical relation on degree of myopia with time used on playing computer and mobile phone, outdoor activity time, establishment of refractive development file or monophagia. Ordinal regression analysis showed that there were statistical differences on grade, myopia in parents, establishment of refractive development file, time used on playing computer and mobile phone, frequence of wearing glasses and how to realize myopia.

CONCLUSION: Grade and myopia in parents were the risk factors for degree of myopia. Ophthalmologists should strengthen the health education on myopia, advise to establish refractive development file as early as possible, monitor regularly for focus groups and control myopia progression actively.