I have worked with a legally blind physician. He had a trained assistant to help with the exam (just the visual/observation parts).
I have met quite a few PM&R physicians (my specialty) with spinal cord injuries. I met a resident who was a complete tetraplegic. She trained and hired assistants to do the exam for her (I think they needed specialty certification, and were obviously always supervised/directed by her). She was obviously very determined.
If you are good enough at what you do, people will make it work. Sometimes they’re legally obligated. And when they aren’t, if you have the funds to pay for the assistance yourself, they will likely be happy to work with you.
The question is whether medicine is what you really want to do and if you’re willing to do the extra work to do it. And if you’re willing to hire the help you need.