2Wu HM, Seet B,Yap EP, Saw SM, Lim TH, Chia KS. Does education explain ethnic differences in myopia prevalenc of young Optom Vis e? A adult Sci, population-based study males in Singapore[J]. 2001,78(4):234-239.
3Katz J,Tielsch JM, Sommer A. Prevalence and risk factors for refractive errors in an adult inner city population[J]. Invest Ophthalmol Vis Sci, 1997, 38(2): 334- 340.
4Ciuffreda KJ, Wallis DM. Myopes show increased after e Vis Sci, ff susceptibility ects[J].Invest to nearwork Ophthalmal 1983, 39 (10): 1797 - 1803.