There’s a list of things that can affect anyone’s driving beyond vision issues in Germany if a Doctor says no driving they mean it, last year I broke my leg the surgeon said no driving even though I was more than fit to drive, 3 months with no license, I had an Ocular Migraine the year before, it was over in 10 seconds = 3 months no driving, they don’t inform anyone like the driving licence department in your area but I you are stopped for something the police will check your medical records and if they find any restrictions placed by a Doctor your going to get hit with big and painful fines or worse. I love driving and want to drive for as long as I can I have a high performance Audi RS6 but if I’m told it’s a no no because something makes me unsafe to be on the road I will stop driving, as for a sick loved one, that’s why we have ambulances so not taking the chance to hurt or worse that loved one or hurting or worse killing an innocent bystander seems more sensible