Back when I was a teenager I had a rabbit, Sarah- one of my b.e. polish - who I inadvertently trained to roll over. When she was still quite young one of her eyes developed an infection, and she had an opaque film over it. I took her to the vet and we were treating it with an antibiotic, but he didn't hold much hope... he saidshe'd most likely be blind in that eye and it would always have that opaqueness to it.
However, once the antibiotics were finished I decided to continue treating Sarah's eye, and gave her daily washes with a mild boric acid solution. She was an outdoor rabbit, but for the duration of treatment I had her indoors. I decided to put a harness on her while in the house, and discovered one day that if I touched her in a certain spot (while she had the harness on) that she would react...she'd flop over to one side. So I thought, why not try and teach her a trick? I would take a treat and, while Sarah was wearing the harness, would touch her in that spot. Then when she'd flop down I'd take the harness and tug on it, while holding the treat in front of her... and I'd move it in acircle. Eventually she learned to 'follow' the treat and, suddenly... I had a bunny that could roll over! Once she learned this, I started encouraging her without the harness on... all I had to do was touch her in that spot while holding a treat and tell her to roll, and she knew what to do. It was pretty unique.
Oh, and her eye....I continued to treat it for another two months or so, and it completely cleared up. When I took Sarah back to the vet to show him, he didn't believe it was her at first, there was such a transformation. She was a very special bunny.