I just saw a documentary on Annie Oakley. Not much I didnt know, but the thing that caught my eyes in all the photos and films was how totally open both her eyes were. I know I give an involuntary squint with my left eye. When I shoot rifle I even use a blind to help relax it. She was 100% open and focused with both eyes. I cant prove focused, but some of the photos were very good. Both eyes looked bright and tracking. Anyway, just a thought.