OH!!!
... and I do not wear spectacles for fashion. I have an advancing astigmatism, advancing by the decade, but when corrected properly I have what is "commonly known" on these shores as "20/05 vision" which basically means that I can see just fine and a bit more than most.
Problem is for me is that without my corrective lenses, I can barely tell which cloud is dark and which cloud is light, since I generally see eight to twenty images of everything I see, without my glasses. The glasses clear it all up for me.
Again, I see ok within a few feet (a few meters) or so. But to see the details on a small coin, for instance (something I have always done, but is lost to me, due to my age, mostly) is impossible, without my bi-focal spectacles. More than a few hundred feet, though (say a bit more than two hundred meters) I start to see double/triple/quadruple, etc.
SO, driving more than a block or two without my glasses is idiotic, mostly.
All that is aside from needing to be careful with my "seeing" equipment.
Bering careful is hard!!