I've been using variable focus lenses. They're driving me crazy.
Essentially, they are cylindrical lenses, and they are only useful in the centerline (up and down) of the lens.
This means I can see at long distances, intermediate distances, the range to my computer monitor, or to a close-held book. Convenient, eh?
It also means that when I drive up to an intersection, I have to turn my head physically around to use the centerline at an angle. I'm not that flexible.
I'm thinking of getting single vision lenses for driving. At least I'll be able to use my peripheral vision again.
I drive with my bifocals -- better vision on the instrument panel, sharpest acuity for distance. I can drive without glasses, and sometimes do, but I really like seeing in detail what's happening WAY down the road...
I did get single vision sunglasses for that reason.