It's good that he's able to see objects now. I do hope he continues to improve with treatment, and that they figure out what's going on with him.
If he doesn't get his perfect vision back, try not to be too upset, because he'll adjust. I have a totally blind dog that runs all over the place and RARELY bumps into anything. He never fell into the pool, or the pond, or anything. He has run into twigs...but never anything big. It's like they have radar.
Hugs to Clifford. Get better big boy!