Theoretically, I think people wearing single vision lenses can see distance better than progressives. A single vision lens is better for seeing distance. However, if you need for a reading addition increases, a pair of progressive is better. If the vision with the progressive lenses improves when you drop your chin slightly, using a higher part of the lens than they have been set too high. This effect can be exaggerated if your driving position has the seat-back inclined backwards, because then your chin tends to be higher, and you naturally use a lower part of the lens. This of course matters hardly at all to a single-vision distance lens, but is critical to whether a varifocal delivers clear distance vision. Just occasionally I have made varifocals specifically for sports car drivers for this reason. Out of the car, the reading portion is too low for anything but occasional use.