Shut one eye to keep your night vision
Shut one eye to keep your night vision.
Apparently, this is a well-known thing in the military, but no one told me until we learned about it in the film Beneath Hill 60 .
It's also a potential reason why pirates are known to wear eye patches—from popping up and down between decks—though it's rather hard to be sure. But I think the primary use case is going for a pee in the night.
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