India would be a good place to test it: "Of the 37 million people across the globe who are blind, over 15 million are from India."(http://timesofindia.indiatime

India would be a good place to test it: "Of the 37 million people across the globe who are blind, over 15 million are from India."(http://timesofindia.indiatimes.com/india/India-has-largest-blind-population/articleshow/2447603.cms http://timesofindia.indiatimes.com/india/India-has-largest-b...)