I've worn progressives for at least 20 years. I "focus" my scopes by aiming at the sky (cloudy day is better) and adjusting ocular until cross hair is crisp and sharp. I think I shoot with both eyes open - both eyes look at target, bring up rifle and target is clear in the scope. Maybe I "squint" the left eye a bit as I squeeze off the shot - not sure. If you need progressives, single vision is a real pain for hunting - you need to be able to see tracks / sign on the ground, but at same time be ready for taking a shot. As they say, it "sucks" to grow older, but I think it is better than not. "A privilege denied to many" - as written by someone on this site...