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Ko, Fang, Susan Vitale, Chiu-Fang Chou, Mary Frances Cotch, Jinan Saaddine, and David S. Friedman. Prevalence of Nonrefractive Visual Impairment in US Adults and Associated Risk Factors, 1999-2002 and 2005-2008. 2012.

Ko, Fang, et al. Prevalence of Nonrefractive Visual Impairment in US Adults and Associated Risk Factors, 1999-2002 and 2005-2008. 2012.