Bifocals (in my case progressives) are a major PITA for shooting. I hate having to raise my head to see my sights clearly
There are workarounds, like reverse bifocals with the magnification on top or custom glasses with the magnification in the center. The problem for me is I'm a defensive shooter only, not a target shooter. I need to be shooting with what I'd have on if I need to use the weapon out in the wild. So I just always use my normal glasses and make the best of it.