Whole World Went Blind

http://www.who.int/mediacentre/factsheets/fs282/en/
https://en.wikipedia.org/wiki/Visual_impairment
http://www.perkins.org/stories/10-little-known-facts-about-blindness
https://nfb.org/images/nfb/publications/bm/bm14/bm1404/bm140414.htm
https://www.quora.com/How-long-does-it-take-to-learn-Braille-and-does-it-get-harder-as-you-get-older
https://www.afb.org/forum/technology-talk/how-do-the-blind-use-computers/12