Naked eye

practice of engaging in visual perception unaided by a magnifying or light-collecting optical device, such as a telescope or microscope. Vision corrected to normal acuity using corrective lenses is considered "naked"

Seeing with naked eye means to look at something without the help of telescope, binoculars or microscope. In astronomy a naked-eye object is something (such as a star) that the general public can see without these optical aids.

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