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For which Eye
I speak from several years in the army. The current way that the army teaches to to keep both eyes open. I have seen it done other ways however there is two main problems with closing one eye. 1 you lose half of your vision. If there are muliple people coming at you it is a bad idea to give up your vision. The second main problem is that closing one eye throws off your vision your brain is set up to look though both eyes. So it doesn't know what to do when you close one of them, Therefore it over compensates.
These are the things that I have learned in the army.
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