Why would you not move? from my own personel experience if i lose sight I should move to reinforce the fact that I am there. Oh and if I run into something then that is good and bad. It will hurt but it will also help me by knowing that there is something right in fron of me. For me loss of vision in dreams only means the sharpening of other senses. In fact I have closed my eyes in dreams before to be all luke skywalker and trust the force instead of my eyes.