Yeah, we figured he's probably blind..My aunt pointed out that he looks up to feel with his whiskers whether anybody/anything is there >.<
But now, when he hears me coming into his cage, I put my hand at the same place (at the edge of his shelf) and he comes onto it, if my hand is anywhere else he seems to just walk over it, so I think he's a hamster of habit
I'm just glad I adopted him, not somebody else who wouldn't have been able to handle him >.<