The sort answer to your question is no. Just like dreams being unable to use any visual imagery, the same goes for concepts like bright, dull, color, etc. are abstract concepts that I really can't put any particular image to. Rule of thumb is that if you can't fully describe it in words that don't involve referring to visual cues, I don't know what it is :) As for feeling it ...it depends. I myself can still see differences between light and dark, as long as they are different enough. Think lightning at night, a lamp turning on in a dark room etc There's no color, shape or anything like that when I see that though. I therefore kind of know what seeing is, but only a very small portions of it. For people who are even more blind than I am, meaning ...no vision at all ... they wouldn't really 'feel' it, its oftencompared to imagining you have a sense that you actually don't have, like a dolphin's ability to always know where north is ...at least ...it was dolphins that coulddo that, no?