Re: teaching the blind
A blind student took part several times in the seminars I gave in the Netherlands. He had learned ukemi and basic taisabaki at his local dojo. At the seminar, one of the dojo members acted as his minder and usually his partner. They were always alert if he trained with someone new.
Whenever I demonstrated a technique, I would always go and get him from the line-up, bring him out to the front and demonstrate on him, making sure his posture was OK and that he knew where his hands and feet needed to be. After demonstrating, I made him do the technique as well and took ukemi from him.
He had a guide dog, which would normally doze at the side of the mat, but clearly enjoyed the attention she received during the seminar.