Sunglasses or sun glasses informally called shades or sunnies; more names below are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes.
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Function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are colored, polarized or darkened. In the early 20th century, they were also known as sun cheaters cheaters then being an American slang term for glasses.
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The American Optometric Association recommends wearing sunglasses that block ultraviolet radiation whenever a person is in the sunlight to protect the eyes from UV and blue light, which can cause several serious eye problems.
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It is important to note that dark glasses that do not block UV radiation can be more damaging to the eyes than not wearing eye protection at all, since they tend to open the pupil and allow more UV rays into the eye.
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