Louis tried to be like his Dad, but it went very wrong; he grabbed an awl, a sharp tool for making holes, and the tool slid and hurt his eye. The wound got infected, and the infection spread, and soon, Louis was blind in both eyes.
Louis trimmed Barbier's 12 dots into 6, ironed out the system by the time he was 15, then published the first-ever braille book in 1829. In 1837, he added symbols for math and music. He assigned different combinations of dots to different letters and punctuation marks, with a total of 64 symbols. He had invented a language for the blind, Braille.