1. World Health Organization. (2004). Magnitude and causes of visual impairment.
http://www.who.int/mediacentre/factsheets/fs282/en/
. Accessed 20 Aug 2007.
2. Resnikoff, S., Pascolini, D., Etya’ale, D., et al. (2004). Global data on visual impairment in the year 2002. Bulletin of the World Health Organization,
82(11), 844–851.
3. The Eye Diseases Prevalence Research Group. (2004). Causes and prevalence of visual impairment among adults in the United States. Archives of Ophthalmology,
122(4), 477–485.
4. Leibowitz, H. M., Krueger, D. E., Maunder, L. R., et al. (1980). The Framingham Eye Study monograph: An ophthalmological and epidemiological study of cataract, glaucoma, diabetic retinopathy, macular degeneration, and visual acuity in a general population of 2631 adults, 1973-1975. Survey of Ophthalmology,
24((Suppl)), 335–610.
5. Vingerling, J. R., Dielemans, I., Hofman, A., et al. (1995). The prevalence of age-related maculopathy in the Rotterdam Study. Ophthalmology,
102(2), 205–210.