Why Did Some Pirates Wear Eye Patches?

The fact that some pirates wore eye patches most likely had nothing to do with a missing eye, and everything to do with being able to see—specifically, above decks and below them.
The eyes adapt quickly when going from darkness to light, studies have shown that it can take up to 25 minutes for them to adapt when going from bright light to darkness, which “requires the regeneration of photo pigments.”
Pirates frequently had to move above and below decks, from daylight to near darkness, and Sheedy says 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.

The Hollywood film industry was built by fleeing pirates

Why did pirates wear a patch over one eye

Why did pirates wear a patch over one eye

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