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you dont have to have both eyes completely open. with some types of sights you can merely have the non dominant eye open just slightly.
the purpose is to keep the muscles around your dominant eye from shifting due to stress. and thus shifting your vision off. Do some dry practice against a big wall. its not common for you to take a target sight up wit one eye closed, and then open the other and find yourself 6-10 inches off the bulls eye.
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