1. The Economic Impact of Vision Problems.
http://www.preventblindness.net/site/DocServer/Impact_of_Vision_Problems.pdf
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2. Vision Problems in the U.S.
http://www.preventblindness.net/site/DocServer/VPUS_2008_update.pdf?docID=1561
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3. Elliott AF, Dreer LE, McGwin G, Scilley K, Owsley C: The personal burden of decreased vision targeted health-related quality of life in nursing home residents. J Aging Health. 2010, 22: 504-521. 10.1177/0898264310361368.
4. Centers for Disease Control and Prevention (CDC): Reasons for not seeking eye care among adults aged ≥40 years with moderate-to-severe visual impairment--21 States, 2006–2009. Morb Mortal Wkly Rep. 2011, 60: 610-613.
5. US Census Bureau.
http://quickfacts.census.gov/qfd/states/01000.html
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