I will go one further. Yes keeping both eyes open is a great habit for combat shooting at fairly close ranges. But now I’ve found that astigmatism in my dominAnt eye forces me to keep both eyes open on the 300 yard rifle range with open sights. I use my non dominant eye (with much clearer vision) to help me guide the ghost image of my soghts onto target. Then I focus with the dominant eye, but focus is a relative term with my right eye these days.
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