Abstract:·AIM:To obtain the prevalence and incidence of myopia at primary school in Zhongshan City.·METHODS:According to the myopia criteria of Eye Encyclopedia of China,we used cluster sampling to make the study sample.Ocular vision,corneal curvance,anterior chamber length,lens lengths and vitreous length were conducted with ARK-30/AR-20 automatic refractive instrument/corneal curvance and STRONG 6000AB portable ocular A/B ultrasonic on these samples.The refractive status were reconducted on these samples one year later.·RESULTS:The prevalence of myopia at primary school in Zhongshan City was 51.7% and 11.3±1.86 students newly developed myopia per hundred.·CONCLUSION:The myopia deepened with age.·
