I grew up in the country and began shooting with my right eye open and left eye closed. Joined the Navy after school served 6 yrs and was trained to keep both eyes open when Shooting. It took awhile to adjust to using both eyes but soon I found my scores improving. After The Navy I was LEO for 32 yrs and we had firearms qualifications every 13 weeks . The training there was also to fire with both eyes open. Some had trouble with it to begin with but soon found it better than one eye shooting. Was no problem for me as I was US Navy trained .