As of last year, I now wear progressive bifocals. There are 3 different types of bifocals (at least, there's probably even more): 1. traditional bifocals with a line between the distance Rx and the reading Rx. 2. lineless bifocals are basically very similar to the original bifocals, the only difference is that you can't see the line when looking at somebody wearing them. For the person wearing them, it's a different story, instead of just having a line to look thru to go from one portion to the other, you have a larger fuzzy area! 3. progressive bifocals. with these there's no noticable fuzzy area, but rather a smooth transition between the distance & reading Rx'es (sort of like a zoom lens)

The only problem with progressive bifocals is that the peripheral vision is blurry. It was explained to me that the lenses are hourglass shaped (the area that does any correction), and that the other areas are just filler sort of. Progressive glasses take some getting used to, you 'focus' them by varying what part of the lens you look out of, so if you see somebody looking at somebody, and moving their head up/down they're looking for the right part of the lens to look out of!
I found that it was almost impossible to focus on the GG of a 4x5 while using progressive lenses, and had a pair of reading only glasses made for reading, and focusing the camera. Using a loupe with the distance Rx works for me too (when I had the reading glasses made I also had a single vision pair made with just the distance Rx). When I use my Graflex Super D I use the single vision lenses, and I have flip up/down reading glasses that are 2.75x magnification.
In the end, like so many other areas of photography, trial & error, trying several combinations to see what you are comfortable with is about the only thing you can do, there's no correct way to use a camera with glasses, nor a wrong way.
My solution was to use a Linhof 4x5 with a rangefinder, it's much easier for me to use than trying to focus on the Super D's GG (the Super D has a chimney to see the GG, so you can't get a loupe on the GG) Of course the Linhof still has a GG so I can still use it any time I want/need to.
-Mike