He began inventing his raised - dot system with his father 's stitching awl , the same implement with which he had blinded himself , finishing at age 15 , in 1824 .
Braille 's other eye went blind because of sympathetic ophthalmia .
Braille began inventing Braille 's raised - dot system with his father 's stitching awl , the same implement with which he had blinded himself , finishing at age 15 , in 1824 .
Braille 's other eye went blind because of sympathetic ophthalmia .