I visited the chap who makes my reading and driving glasses and told him what I needed to be able to see ie the foresight well and the target fairly well, he did eye tests and produced a lens to go in a proper shooting glass frame I got of Ebay. My need was to be able to shoot .22lr 25yd prone better. I now use the frame and lens for any iron sights including peep as it helps a great deal. So my advice would be talk to your optometrist first.
I am using 1.75 readers for close work. Amazingly, 1.25 readers help my distance vision and being able to focus on the front sight as well as seeing the rear and target. Like going back in a time machine for me.