I have the same issue but 11 years older.. Got some trifocals, but they do not seem to help. I can either have the sights clear or the target, I prefer the sights to be clear with the target just fuzzy. Rifles I can still do OK, it is the pistols that cause the problems. In the younger years the sights were clear and the target clear enough to see the 10 ring clearly. Shotguns well....... Must be that left eye dominate thing.
That's how I handle it when that merit aperture is too much trouble. Just lean my head back and use the near focus portion of the progressive lens to get the sights sharp. You can still hit center mass of larger targets like ringers or such, although smaller targets like soda cans or shotshells at 25 yards can be a little tough to see.
Between sight alignment and sight picture, sight alignment is the most critical. If you can't see both the target and sights in focus, focus on the sights.
