I have been pondering this question for a while, it does occur to me that Aikido could well be one of the most suitable martial arts for a blind person to use for self defense purposes. Sadly it is the elderly and people with obvious disabilities that are the most likely to be attacked by cowards in our society. Its also worth noting that the loss of one sense can increase your capacity in other senses.
I would disagree completely here seeing a huge difference between practicing (possible blind) and "most suitable for self defence". I may sound like a broken record (ie. the kid's thread) but I would go for Judo here too. Aikido needs incredible hand eye coordination whereas judo basically requires getting a good grip.