Ideally, you should shoot everything with optics
with both eyes open. You can train yourself to do this, then muscle memory takes over and you don't have to think about it anymore. It works similar to the original red dot
design by Armson
, the OEG
(Occluded Eye Gunsight). Your brain has the ability to blend the different images from your eyes and let you concentrate on the view you need. This allows for maximum peripheral vision. When I learned to do this decades ago it became normal. I squint sometimes when aiming hard, but if I closed one eye now, I would feel very limited compared to what I'm used to.