I had great eyesight until I was in my late 40s; then, I started using reading glasses as shooting glasses. Now, in my 70s, I use trifocal lens glasses with the midsection focal point at the end of my fingertip with a fully extended arm. This gives me a focal point at the front sight of most of my pistols. This is also good for desktop computer work. I have also retrained myself to shoot with both eyes; sometimes, I forget and close one eye.