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Naked eye
01
the human eye unaided by any optical device, used for observing objects and details directly
Example
The infinitesimal crack in the glass was barely visible to the naked eye.
The Andromeda Galaxy, the nearest spiral galaxy to the Milky Way, is visible to the naked eye in the night sky.
With eyes like a hawk, the astronomer could identify celestial objects and constellations that were barely visible to the naked eye.
The minuscule insects crawled along the forest floor, nearly invisible to the naked eye.
Ultraviolet photography reveals patterns not visible to the naked eye.