actually I'm useless without my glasses (somewhere around -11 currently) but I just can't imagine being without sight. I love seeing things, creating things and really need sight. If I go deaf, I just hope I won't get some virtual tinitus that keeps bugging me for the rest of my life.
I would go with deaf also, especially since I've had 25 years of good hearing and heard a lot of great music and mastered speech. I think the inability to hear is much less detrimental than the inability to see. Blindness would cripple my ability to interact with computers (both the screen and the innards of my CPU case) which occupies a great deal of my passion and free time.