Yunkai Lu, Yangfeng Guo, Hongxing Diao, Xiaosong Liang, Jinhua Lu, Yangfa Zeng
1 State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060,China
2 Health Promotion Center for Primary and Secondary Schools of Guangzhou Municipality,Guangzhou 510180,China
Table 1 Comparison of test scores between two groups