Braille
Braille may not be the main way blind people read and write. In Britain (for example), of the two million visually impaired people, only about 15-20 thousand use Braille. In the U.S.A. according to the 2015 Annual Report from the American Printing House for the Blind, there were 61,739 legally blind students registered in the U.S. Of these, only 8.6% (5,333) were registered as braille readers, 31% (19,109) as visual readers, 9.4% (5,795) as auditory readers, 17% (10,470) as pre-readers, and 34% (21,032) as non-readers.