Read about a blind dutch woman last year who was kiting. She got her instructions from someone on shore with mic/headphones.
I think it was in the Dutch Access magazine, but try google: blind kitesurfing ........ and you'll understand what the list looks like
Though sometimes i think there are a lot of blind kiters on the water she would be the only one who can honestly say: "i didn't see you." if she crashes into you
