Put this one in the strange category, but I got myself some +1.0 diopter safety glasses to help my old eyes see the sights more clearly. They helped me see the sights and marginally made the target at distance more fuzzy. The strange thing was that my sights were no longer pointing to where I was aiming. They were off by a couple of inches at 10-15 yards. I tried another gun and found the same thing. Then I figured that the only thing I had changed was the shooting glasses. I went back to regular safety glasses and my sights were back spot on. I wouldn't have thought this could have made a difference, but it did. Maybe my eyes are not well aligned with the optical center of the +1.0 glasses. Anyway, it was a unexpected discovery for me.