A type of writing called Braille. A bunch of bumps that form words and letters. A blind person will touch the bumps and can feel what the letter, word or sentence is. Braille is most commonly found...
The figures I've seen are that "less than 10%" of visually impaired people in the US read Braille, while in the UK the figure is 2%. For US figures, see a fascinating report on the decline of Braille...
Braille is an arrangement of raised dots on a surface that form numbers, letters, and words. Blind persons feel the dots with their fingertips to recognize the patterns. The technique is similar to...
louis braille taught blind people how to use braille by gathering some blind people and asking them what they felt on the dots and then told them what that letter, number or word was.