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

http://www.who.int/bulletin/archives/79(3)227.pdf

http://onlinelibrary.wiley.com/o/cochrane/clsysrev/articles/CD001860/frame.html

http://whqlibdoc.who.int/publications/2010/9789241500722_eng.pdf

http://www.who.int/blindness/causes/priority/en/index4.html

http://www.cureblindness.org/world-blindness

http://www.vision2020.org/main.cfm

http://www.dit.ie/mozambique-eyecare/developmentandeyecare/

http://vision2020.org/main.cfm