Naked eye
Human vision, unaided by optical instruments / From Wikipedia, the free encyclopedia
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For other uses, see Naked eye (disambiguation).
"Bare eye" redirects here. For the bird genus commonly known as "bare-eyes", see Phlegopsis.
Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection.
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In astronomy, the naked eye may be used to observe celestial events and objects visible without equipment, such as conjunctions, passing comets, meteor showers, and the brightest asteroids, including 4 Vesta. Sky lore and various tests demonstrate an impressive variety of phenomena visible to the unaided eye.