Me: So you’ve never been able to see your entire life? You’ve heard of words like ugly, pretty, fat, stupid? What do those words mean to you?

Old Man: Yes, I’ve heard those words, but I don’t understand what they mean. People don’t understand…I have never seen anything so I don’t have a concept of what things look like. It’s so strange to have someone ask me about that. No one has ever asked me about that. I don’t know much, but I do know I’ve been called many of those words. I don’t get upset when someone calls me old, stupid or whatever because I don’t know what it really means when describing a person.

taken from "interview with blind homeless."

quite a good read... take a look at the whole conversation at least...