Tell your optometrist you're a shooter and describe whats involved in your different shooting sports (optically that is) in case he doesn't understand.
I'm lucky that my brother is an optometrist, and he's made me a few pair of glasses for the woods and for the bench.....he adjusts where the focal point is on the lens for different rifle applications....I'm right handed and right eyed so that makes it convenient to place the focal point high and off center for when I'm using a scoped rifle at the bench. It's different for me in the woods so he cheats the focal point more to the regular center for my field hunting glasses and sunglasses.
I don't do a lot of pistol shooting but I can see where straight bifocals or progressive lenses may create problems for you.
The sad truth is, Mother Nature's playing games with our eyes as we age.... and reading fine print starts to look like someone trying to play the trombone. So trying to focus on more than one (or two) focal points all at once is a problem.
Your optometrist may have options for you but the peep is a great tool to clear up the front sight picture. I'm 53 and I feel your pain!