I was talking about shooting glasses the other day to a guy from my smallbore club. He was explaining that reading glasses are not shooting glasses. The prescription lense for shooting glasses used with diopter sights is specially measured and something most opticians don't know much about. They have to be set to focus about one inch short of your foresight.
So, although you might not see the target clearly, you might also benefit from a different prescription?
Anschutz 2013 MEC1 .22LR
Miroku 3800 12bore