7HE M, ZENG J, LIU Y,et al. Refractive error and visual impairment in urban children in southern China. Invest Ophthalmol Vis Sci, 2004,45(3) :793 -799.
8HE M, HUANG W, ZHENG Y,et al. Refractive error and visual impairment in school children in rural southern China. Ophthalmology, 2007,114(2) :374 -382.
9ZHAO J, PAN X, SUI R,et al. Refractive error study in children: results from Shunyi District, China. Am J Ophthalmol,2000,129(4) : 427 - 435.
10VILLARREAL MG, OHLSSON J, ABRAHAMSSON M, et al. Myopisation :The refractive tendency in teenagers. Prevalence of myopia among young teenagers in Sweden. Acta Ophthalmol Scand, 2000,78 (2) :177 -181.