I know I might get some heat for this, but I might go as far as to say that being blind is almost an advantage when it comes to playing a musical instrument. We're all aware of how detrimental it is to get into the habit of looking at your hands while you play, and I'm sure most of us are also aware that the loss of one sense necessarily improves the others--it's neurobiology. Unfortunately, being blind ain't much of an advantage in any other area of life.
There is also even one huge disadvantage to being a blind musician, and that's that your interpretation of a piece is necessarily based on someone else's. I.e., for obvious reasons, you can never look at a given score and interpret it according to your sensibilities. I still find Tsujii and other blind musicians remarkably impressive, though.