so sorry to hear your bunnie has gone blind, as with a lot of things I think it is worse for the owner of the animal than it is for the pet itself, they just accept it and get on with it whereas we dwell on it and obviously get upset.
My bun lost her sight after ec and she coped amazingly well, even down to giving her a new hutch and run- I just sat with her and made sure she didnt jump and hit anything, and in a couple of days she was fine, running-yes running about like a goodun. What I did do was make sure everything stayed in the same place and if I moved anything I would show her it so she got used to it, and when ever I came down the garden I would talk to her so she knew I was there and didnt make her jump!
Good luck