Naked eye (also called
bare eye) is the 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". In
astronomy, the naked eye may be used to observe events that can be viewed without equipment, such as an
astronomical conjunction, the passage of a
comet, or a
meteor shower. Sky lore and various tests demonstrate an impressive wealth of phenomena that can be seen with the unaided eye.