Prevalence And Factors Of Myopia Among Children Aged 6?11 In Yongchuan District Of Chongqing City

Objective: To investigate the prevalence and factors of myopia among children aged 6~11 in Yongchuan district of Chongqing,and to provide theoretical basis for myopia prevention.Methods: Using school based cross-sectional survey to examine a primary school from grade 1 to grade 5 in Yongchuan district of Chongqing.The refractive state was obtained through auto-refractometry and retinoscopy after complete cycloplegic with 1% cyclopentanlol,related factors for myopia were obtained through questionnaire,Pearson ?2 and logistic regression analysis were used to process the data.Results: Overall,316 of the whole 1768 children were near-sighted,the prevalence of myopia was 17.87%,mild myopia were 269 cases which accounting for 85.13%,moderate and high myopia were 47 cases which accounting for14.87%.The prevalence of myopia for boys and girls was 16.10% and 19.64% respectively,showing no significant difference(?2 =3.771,P=0.052);The prevalence of myopia increases gradually with the increase of age and grade(age: ?2=128.990,P=0.000;grade: ?2=132.410,P=0.000);Children whose parents with myopia have the highest myopia rate,followed by children with one parent presenting with myopia and then children with both parents presenting with myopia,which has statistically significant difference(?2=44.719,P=0.000).Multiple logistic regression analysis suggested that age,grade and parents have myopia in one or both were the influencing factors for myopia(P <0.05).Conclusion: The prevalence of myopia among children aged 6~11 in Yongchuan district of Chongqing increases with the age and grade,Children whose parents suffered myopia have a high rate of myopia prevalence.Myopia is related to the age,grade and parental history of myopia.