I can corroborate what the others have related - shooting with both eyes definitely helps and (obviously) increases both depth perception and field of view. When I started shooting around 17 years ago, I was told to use my 'strong eye' (my left). It was uncomfortable to have one eye squeezed shut, and quickly realized having both eyes open, while still using my 'strong eye' for aiming, was ideal. Interestingly enough, I'm right handed, and was told I should use my right eye. Never worked that way.
My current career happens to be in optical alignment and I've always used both eyes in this as well, a carry over from shooting.
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