My Dad had to tell his Dad to stop driving when he was driving through North Wales and went through one of the tunnels
He put his headlights on but couldn't tell if they were on or not
He got out but still couldn't tell when standing in front of the car
until he put his eye right up to the lens - only then could he tell the headlights were on
on a dull day!!
He was a damn good driver - but only the Gods know how he didn't hit anyone those last few months!
My Dad stopped driving at night when his night vision got bad
then stopped driving altogether a year or so after
which was a massive thing for him as he was disabled - and the car was his only way of getting out of the house
but he did it because he knew it was the right thing to do
Other people need regulations
Yep, my late dad, straight as a die normally, rang someone I can't remember now to ask to come and get him. He was driving and got lost, it turned out his sight had been slowly deteriorating and it finally reached the point where even he had to throw in the towel...should have done it much much earlier.
We went completely blind a few months later...
At 67, these upcoming 'nuisances' are getting closer but hey, better they weedle out the ones that really shouldn't be on the road