@ray666
As you are probably aware, prisms help with the double vision, and nothing more. The progressive part is to allow both reading and distance vision (with prism) within one pair of glasses. This worked fine for me as long as the prism correction was low, but now that my prism correction has increased and PN has increased, I find that one pair of glasses with progressives works only for territory where I'm very comfortable walking, e.g., driveway, inside a store. Unknown territory, forget about it! Even stepping up onto a curb when downtown and no handicapped parking is available - I find it very difficult to know if that curb is 4 inches tall or 6 inches tall. If I'm in a handicapped parking spot that has a curb cut on the passenger side of the car, but none on the driver's side, I, as the driver, will walk around the back of my car to avoid stepping up onto the curb. The only option is to mentally gauge the curb height as I exit the door, not as I approach the curb, and make my step up, not from what I'm seeing when at the curb, but from the mental measurement I made of it as I got out of the car or as I pulled into the parking spot. I have to tell myself that the curb is X inches tall, but NOT look at it, just step up the X inches I've told myself. My vision is not reliable. What's going to happen the time I forget to mentally tell myself the curb height and I don't step high enough? Or I'm talking with someone and don't go through these mental gymnastics? So I'll no longer be wearing progressives out of doors. They are fine at the computer or inside the house, but my vision no longer makes progressive lenses suitable for being the glasses I wear for yard work, driving, or walking anywhere that is not level.