01. Congdon, N., et al., Causes and prevalence of visual impairment among adults in the United States. Arch Ophthalmol, 2004. 122(4): p. 477-85.

01. Congdon, N., et al., Causes and prevalence of visual impairment among adults in the United States. Arch Ophthalmol, 2004. 122(4): p. 477-85.