Pirates would wear an eye patch over one eye while on deck to adapt to the darkness, allowing them to see immediately below deck.
It helps to enhance night vision, the pupil dilates when transitioning from a bright to a dark environment, which can take up to 25 minutes.
It is said they also wear an eye patch to protect their eyes from dry air and dust.
Furthermore, it was also utilised to safeguard an eye injured during pirate fights from further damage and infection.
Additionally, it became connected with pirates as a mark of toughness and bravery.
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