Greetings,
I have bifocals for distance and and reading, this causes me to have to tilt my head back to use the computer. I just purchased a pair of glasses for that reasonr, focusing about arm length to see the screen.
What focus should I have in my shooting glasses? Knowing that rifle is different from pistol, i.e. rear sight is close while front sight is

at the end of the rifle, and with pistol you hold both sights are arm length. so what do I need?
Eyesight is good at distance, just slightly out of focus.