cjwils:  I have 20/20 distant vision but require 2x readers for close vision.  I have resorted to using impact resistant 1x and 1&1/2x readers as shooting glasses.  These allow me to see iron pistol and open rifle sights in sharp focus.  Pistol Bullseyes and Rifle Bullseyes may appear fuzzy and out-of-focus but the sights are clear.  Alignment of the front and rear sight is much more important than slight mistakes in aiming at a fuzzy bullseye.  Experiment and give this a try.