I didn't say open both eyes didn't work.
I mean it aren't work for them and it making them has a harder time to aiming which is most of us commonly never experienced with gun before.
I'm hit it !!!
This is a old picture since 2022 when i were trained in military school.
first time fired 5 round M16 but it is .22 round, and all of them hit the target which made me surprised.
It is amusing me there were a guy said " Open both eyes for clear sight " and yup he didn't even hit target. worst he were told other people to do the same.
But me i close just one eye for aiming, people know right ? M16 has really small iron sight and target is far away.