naked eye

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  • noun

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the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects

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References in classic literature ?
They are exceedingly minute, and quite invisible to the naked eye, only covering a space equal to the square of the thousandth of an inch.
On their skin you cannot even distinguish the circulating veins with the naked eye.
The view from the narrow ledge was magnificent; from it vessels seeming like the tiniest little toy boats were turned into noble ships by the telescopes, and other vessels that were fifty miles away and even sixty, they said, and invisible to the naked eye, could be clearly distinguished through those same telescopes.
He now took the stick from my hands and examined it for a few minutes with his naked eyes.
He balanced the watch in his hand, gazed hard at the dial, opened the back, and examined the works, first with his naked eyes and then with a powerful convex lens.
Finally, if the diamond has a flaw that's visible to the naked eye, you don't want it.
Initial bridge inspections are primarily conducted using the naked eye alone, and the Federal Highway Administration has stated that 56% of these inspections result in incorrect bridge ratings.
But what is the total number of stars visible to the naked eye during all seasons and from all latitudes on Earth?
This guide is both a visually engaging and a clearly written introduction to reading the night sky with the naked eye, a telescope, or binoculars.
While the glow can't be seen with the naked eye, researchers use a $90,000 digital video camera that can detect extremely faint light.
Although initial bridge inspections are primarily conducted using the naked eye alone, we strongly believe our EFS technology will be a very significant tool in enhancing the current inspection process by detecting flaws that are not visible to the naked eye.
Ranging in diameter from 25 to 45 kilometers, the bodies are the smallest objects ever detected at the fringes of the solar system and are one-billionth as bright as the dimmest celestial objects visible to the naked eye.
Supernova 1987A appeared 10 years ago in Southern Hemisphere skies as the first supernova visible to the naked eye in almost four centuries.
Once inserted just under the skin in a brief outpatient "chipping" procedure, the VeriChip is inconspicuous to the naked eye.
Countless skywatchers in the Southern Hemisphere saw Supernova 1987A with the naked eye.