Well, since you did put this post into Defensive Carry Discussions/Concealed Carry Issues & Discussions I can assume that you are concerned about a deterioration of your keen eyesight as it relates to carrying your firearm for self-defensive purposes?
The reason that I ask is that nearly all of shooting for self-defense is in almost no way related to traditional Paper Target, Bullseye-Shooting...or the "X" Ring.
Of Course the extreme basic firearm skills that are learned just from "going out" and shooting/handling a firearm (in general) are quite initially important/valuable but, that is about where the relationship ends.
Click and watch this Video (Link Provided Below) by my bud Jim Grover AKA Kelly McCann and do make it through the beginning GP disclaimer because it quickly becomes increasingly much more down-home reality based and real.
Here ya go...Watch it! ~~~> YouTube - Combative Pistol