There are many movies and TV shows and Japanese anime films such as Ninja Scroll that involve a blind swordsman. Certainly an incredible concept, but by now it is cliche. Just a year or two ago there was another foreign movie about one in the orient. But what is the origin of this cliche? What's the original story that inspired all these knockoffs?
So where did it come from first? Is it some Kurosawa movie? An old comic book? An ancient folktale? A true story?