Eyepatch

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An eyepatch is a small patch, usually of black cloth, that is worn in front of one eye and usually attached around the head by an elastic band or by a string. It is often worn by people to cover a lost or injured eye, but it also has a therapeutic use in children for the treatment of amblyopia or lazy eye syndrome. (See orthoptics and vision therapy.)

In the years before advanced medicine and surgery, eyepatches were common. They were particularly prevalent among members of dangerous occupations, such as pirates and blacksmiths. Today, with prosthetic eyes increasingly accessible, eyepatches are no longer commonplace.

Eye patches were not only used for covering a missing eye or correcting eye problems as many people believe, but had a more practical purpose for sailors and pilots. Sailors (stereotyped by the eye patch wearing pirate) who were crew members who often went above and below deck, used eye patches to have one eye adjusted for the top deck and the other eye already adjusted for the darkness when suddenly going below deck. The strong sunlight while above deck on an oceangoing vessel could require minutes of adjustment to the dim lighting below deck. With virtually no light sources below deck, sailors would have to rely heavily upon their eyes to adjust. In the critical moments of modifying the rigging, navigating, and especially during battle, those minutes were too precious. A simple switch of the patch from one eye to the other saved time and was more convenient than being temporarily blinded when going between decks.Template:Fact

Similarly, pilots at one time would also do the same, when flying at night over brightly lit cities, so that one eye could look out, and the other would be adjusted for the dim lighting of the cockpit to read unlit instruments and maps. When flashlights with red bulbs, backlit instruments, and other nifty gadgets came along, that no longer was necessary, just as boats and ships evolving into being well lit made eye patches a thing of the past for most boating.

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