How he sees, or if he even can, is a mystery. He seems to have some sort of visual sense, but exactly how it works or where it is located is unknown. He cannot explain how he sees, since it's hard for him to know if he's seeing differently than anyone else. This sight seems to be able to be projected outward, however, since he often writes on his own face so perfectly it seems impossible that he could do it from touch alone. Left-handed, the legibility of the words written on himself are no concern.