I came up with this idea for a quick glance at the turret to make sure its on zero. I've noticed in the past 4 or 5 years, my close up vision is getting worse and worse. I have 20/15 distance vision but to see detail up close I need "cheaters".
Sooner or later a guy will set up for a close shot and the scope wont be on zero. I though this might be noticed fairly easy..I can always scrub it off later.