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http://www.who.int/topics/blindness/en/    

http://www.who.int/mediacentre/news/releases/pr79/en/
http://whqlibdoc.who.int/bulletin/2001/issue3/79(3)227-232.pdf

http://www.who.int/blindness/en/index.html

http://www.nature.com/eye/journal/v19/n10/full/6701973a.html

http://www.who.int/mediacentre/factsheets/fs282/en/index.html

http://www.who.int/features/factfiles/vision/04_en.html

http://www.who.int/features/factfiles/blindness/blindness_facts/en/index7.html

http://www.who.int/bulletin/volumes/82/11/en/844.pdf