if you look closely you can actually see a literal blinder over her left eye! the reason it helps is because precision shooting is all about repeatability, and both eyes open is a more repeatable position than closing one eye exactly the same way every time
Anybody who knows about this: how do those gizmos help? E.g. earplugs are useful without performance-enhancing.
It’s all about directing eyes and blocking distractions
High tech blinkers
if you look closely you can actually see a literal blinder over her left eye! the reason it helps is because precision shooting is all about repeatability, and both eyes open is a more repeatable position than closing one eye exactly the same way every time