Well that’s good news and bad news I guess! Nothing painful but nothing to do about it.
I had a blind bunny, and had two experiences bonding. My bonded pair were not super interested in him, so that was a no go. But I luckily found a nice gentle senior and they got on from the first time they met, and he did act as a seeing eye bunny. Though Chuck never had issues getting around, he was much more active with his friend. Since your two are already bonded, you may have no trouble at all. Also this seems to be coming on slowly so I’m sure they’ll adjust. You’ll want to watch to make sure the other one isn’t bullying him, and that they are eating together and grooming (signs of happy bonded pair).
You’ll want to ensure he has no access to stairs, drops or other dangers, or hot things-like floor heaters.
Also I saw these scented dots in a pet store-you might find them online. They are specifically for blind dogs, but rabbits have a good sense of smell too. Or you could get creative. Anyways they idea is all the dots smell different and you stick them on different areas and that helps the blind animal navigate. I didn’t find these until after Chuck had passed but I think they may be useful if you could find them.