Tommy Edison, who has always been blind, was asked by some of his Youtube subscribers if people who have been blind since birth actually see in their dreams. Here’s his answer:

So I’ve bee blind since birth, so I’ve never seen anything in my life, so one of the things that you guys wonder about, is if I can see in my dreams. I think because I’ve never seen in real life, my sub-conscious doesn’t know what it’d be like to see, either, so, no. I don’t see in my dreams

[Tommy Edison | Via]