Objective To provide the basis for health care and prevention by investigating Tongcheng County Primary school students of myopia. Methods Take the 2016 year from March to July Tongcheng County 4 primary schools' students in the sample. Each school for each grade selects 2 classes. The total of 1822 pupils were examined for visual acuity test, computer optometry and mydriatic optometry. The prevalence of myopia and related factors were analyzed by chi-square test. Results There were statistically significan...