It's worth mentioning that the"allowed to drive" eyesight standard is a lot worse than you'd reasonably expect. My elderly father was driving with, in my opinion, unacceptably bad eyesight, as well as considerably reduced capacity, and yet, when we finally bullied him into getting an eye test, the optician was telling him he was just about legal to drive whilst I was waving my arms and mouthing "no!" to try and get her to bend the truth a bit. Fair play he didn't really drive much after that even after getting his cataracts done and them having perfectly OK eyesight.
Now for all that, I do stand by my earlier comment, that eyesight per se was a bit of a distraction from the real issue of people not looking, and worse, not really caring enough to look. It's not really SMIDSY but more like SMIDGF. My half blind (albeit legally OK) father was likely less of a hazard than pushy aggressive drivers, whilst acknowledging he really should not have been driving by then.
