I've seen a lot of questions about ass wiping lately but the most important? hasn't been asked. How does a blind person know when to stop wiping?

I don't know about the rest of you but I keep looking after each wipe until my paper is completely clean. I live in a civilized society.
I've seen a lot of questions about ass wiping lately but the most important? hasn't been asked. How does a blind person know when to stop wiping?
Post Opinion