Tough choice, but as a personal preference I would much rather lose sight than hearing. When things get too quiet, it drives me crazy for some reason. Maybe I like chaos, it usually liven things up. It would suck to be blind but to stay optimistic I could live with the mindset that everything is a surprise that I can only picture in my mind. There are also the clichés of "Look with your heart, not with your mind," and "Seeing isn't believing. Believing is seeing."