Shut one eye to keep your night vision
![Shut one eye to keep your night vision illustration](https://images.prismic.io/sketchplanations/1377f767-64ee-4b5e-bd38-5aad87e223e6_53043577581.jpg?auto=compress%2Cformat&fit=max&w=3840&q=50)
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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