Disabled persons Brailler script India (2007) stamps on the cover
The standard type for the blind in the Western World is largely due to the effort of a blind Frenchman called Louis Braille. Before him, different types were available but difficult to use. He simplified the types used by the French army for night reading into the six-dot raised types which can be read with one touch of the finger tips. However, his invention was not recognised until two years after his death.
More information about Braille theme you can find here: http://www.mrcophth.com/ophthalmologyonstamps/mainpage.html
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