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" / From Wikipedia, the free encyclopedia
If something can be seen with the naked eye, it means that it can be seen without using a microscope, binoculars, glasses or a telescope. In astronomy, a naked-eye object is something, such as a star, that the general public can see without using these tools.