0xp I agree that this character needs some flesh and bone though the idea of a caster being blind has possibilities. There are detriments but benefits as well. He would be immune to vision attacks and illusion spells but more susceptible to sound based attacks. Even Braille could be a cool twist, though a form of rune. Forgive me if I ramble on. Below is a little suggestion for character development.

Perhaps a little on what he was like as a child and how he became a mage feeding into the story of his blindness and eventually his creation of Braille/rune scrolls. He would have to create his own scrolls since he'd be a rarity. Perhaps he finds a tome that he could not read when he had his sight. Where and how did he come across this tome? After going blind he has feelings of hopelessness over the course of a week. Eventually growing frustrated, he manages to find his library. Once there he begins throwing papers and books in a fit of rage as he clumsily feels his way around the room. Growing weary and distraught, he settles down and inadvertently places his hand on that strange tome he couldn't read previously and realizes that he senses something about this tome, strange and exciting. He sits down and caresses the cover of the book with his finger in anticipation and letters begin to form in his mind. He concentrates and soon words begin to form. Sucked in by curiosity, he sits for many days reading, stopping only for life's essentials before returning to continue his study of these mystic pages of strange runes. Once he absorbed the tome, he was endowed with the ability (a feat) to create runes that can be read with the hand not the eye. He could fashion these runes into his staff through use of the skills of carving he developed as a child and likewise into scrolls by lightly stabbing with dabs of spell components on the end of a thin dagger. Only another of his kind could use his staff and scrolls.

With one or two good magic items he could be a formidable foe.

Let the mind run from there. Hope this helps. Good luck.