Pirates frequently had to move above and below decks, from daylight to near darkness, and … the smart ones "wore a patch over one eye to keep it dark-adapted outside."
When the pirate went below decks, he could switch the patch to the outdoor eye and see in the darkness easily (potentially to fight while boarding and plundering another vessel).
See full article at http://mentalfloss.com/article/52493/why-did-pirates-wear-eye-patches
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