I also got a rare opportunity to work with a blind individual. While it might be hard for a blind person to take a striking art, there are plenty of sight-impaired and blind judoka out there. (Like Paraolympic Gold Medalist Scott Moore of Denver Judo). This guy was actually a perfect size match for me - a couple of inches taller and within 5 lbs - and his technique was excellent.
Finally, I was asked by someone for Randori advice, which I am reluctant to do. But it made me think - if he is asking, then clearly he values my opinion, and if I can give him a succinct, concrete answer that actually improves his judo, then maybe I am getting better at this without even realizing.
My advice to him was predicated on a common habit that many people (including me some times) have. When they win a strong grip, the fight to hold on to the grip, without ever thinking that a great time to attack is when your opponent is trying to break your grip and take his own.