In real life, did pirates really wear eye patches and why?
At the height of the age of pirates, eye patches were common for individuals who had lost their eyes in combat or due to disease and were mainly used by these individuals in order to prevent infection.
Most sailors, however, wore these eye patches for a different reason. At this time, ships would be incredibly dark and difficult to navigate below decks, and it was often a problem for sailors and pirates to have to wait for their eyes to adjust to the light in order to do their duties.
To counteract this, many sailors wore an eye patch over one eye that they would then lift up when they went below decks in order for them to be able to adjust to the light more quickly.