I've given the master eye test to a lot of new shooters, and I'm learning there is not just right and left eyed dominance. Some people are both-eye dominant or "center dominant." My younger son John is center dominant - when he does the eye test his hands wind up over the bridge of his nose, not over one his eyes, but it doesn't affect his shooting. His friend Nicky, who just joined our high school trap club, is extremely center-dominant. If she puts the gun to her right shoulder, the gun blocks enough of her right eye's vision that the left eye takes over, vice versa if she tries shooting left handed. The first time she shot I hadn't figured this out yet, and she broke four targets out of about 100 (she liked shooting and wouldn't stop). Next time, I tried making her shoot left handed, but that didn't work any better than right handed. Then I put a small piece of masking tape over her glasses to block the left eye's vision, and she started pounding targets. Last weekend, her third time shooting a shotgun, she broke a 20x25.