Seeing Fingers: The Story of Louis Braille

"It was a boy, not a man, who devised the ingenious system of raised bumps for reading and writing used by the visually handicapped. When Louis Braille was almost 4 years old he blinded himself with a sharp awl in his father's harness shop. But the instrument that caused his tragic accident later helped Louis solve the problem of reading.
With his six-dot code, Louis Braille opened the doors of universities and libraries, and made available the trades and professions of a sighted world to those who read by touch and see with their fingers." - from the back cover

A quick read to learn a lot about Louis Braille.