If you had my eyesight you'd understand that the rear sight being fuzzy doesn't matter much. Just concentrate on the front sight. The target and rear sight will be fuzzy, but that doesn't keep me from shooting good. You can't keep the rear sight, front sight and target in focus at the same time no matter how good your eyesight is. Your brain will center on the rear sight without looking at it. Just like your brain puts the front sight in the middle of a peep sight. Do you look at the peep when you shoot one? No, you look at the front sight.

Ask any sniper and he'll tell you to just look at the front sight.