Just wondering how many people who train and practice at the range and at home dry firing shoot or practice with BOTH eyes open? Know the benefits of both eyes open shooting and hence follow that rule. We are discussing pistol shooting, not rifle. Also who has been taught that using iron sights one only uses the front sight and as it is impossible to focus on front and rear sight struggle? It comes back to holding a pistol correctly and it works. Many people i have taught i usually after i have shot with them for a few days I put tape over the rear sight and the shooter is surprised when they hit the target with their shoots. I start at 10 yards, and then move back. Possibly that is why so many professionals, police etc are now using red dots.