Sight unassisted by an instrument such as a microscope or telescope. For example, These insects are too small to be seen with the naked eye. This expression was first recorded in They eye the door anxiously, convinced that at any moment, a Pakistani or Iranian intelligence officer will come barging in. Nervous fans can keep a vigilant eye on it via a webcam hosted on the town website that offers hour goat viewing.
Starwatch: Beehive's buried treasure for the naked eye
the naked eye | meaning of the naked eye in Longman Dictionary of Contemporary English | LDOCE
Naked eye , also called bare eye or unaided eye , is the practice of engaging in visual perception unaided by a magnifying or light-collecting optical instrument , such as a telescope or microscope. Vision corrected to normal acuity using corrective lenses is still considered "naked". 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. The visibility of astronomical objects is strongly affected by light pollution. Even a few hundred kilometers away from a metropolitan area where the sky can appear to be very dark, it is still the residual light pollution that sets the limit on the visibility of faint objects.
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