the naked eye

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the naked eye

Normal vision that has not been enhanced or augmented in any way. Because bacteria are invisible to the naked eye, it was only relatively recently in human history that we even became aware of their existence. The fine print is so tiny, you can barely make it out with the naked eye.
See also: eye, naked

*naked eye

the human eye, unassisted by optics, such as a telescope, microscope, or spectacles. (*Typically: appear to ~; look to ~; see with ~; visible to~.) I can't see the bird's markings with the naked eye. The scientist could see nothing in the liquid with the naked eye, but with the aid of a microscope, she identified the bacteria. That's how it appears to the naked eye.
See also: eye, naked

with the naked eye

with eyes that are not aided by telescopes, microscopes, or binoculars. The moon is quite visible with the naked eye. Bacteria are too small to be seen with the naked eye.
See also: eye, naked

naked eye

Sight unassisted by an instrument such as a microscope or telescope. For example, These insects are too small to be seen with the naked eye. This expression was first recorded in 1664.
See also: eye, naked

the naked eye

COMMON If something can be seen with the naked eye, you can see it without the help of equipment such as a telescope or microscope. These green insects, just visible to the naked eye, are generally found on the under side of the leaves. Enough light gets through space for us to see thousands of stars with the naked eye.
See also: eye, naked

the naked ˈeye

the normal power of your eyes without the help of an instrument: Bacteria are invisible to the naked eye.
See also: eye, naked
References in classic literature ?
And, by the time he had preached ten minutes, I felt so small and insignificant that I thought I must be invisible to the naked eye.
You must know that the Marionette, even from his birth, had very small ears, so small indeed that to the naked eye they could hardly be seen.
In which Mr Jones receives many friendly visits during his confinement; with some fine touches of the passion of love, scarce visible to the naked eye.
He died from drinking out of your liqueur glass, into which a few specks of that powder, invisible almost to the naked eye, had been dropped.
Near Keeling Atoll, in the Indian Ocean, I observed many little masses of confervae a few inches square, consisting of long cylindrical threads of excessive thinness, so as to be barely visible to the naked eye, mingled with other rather larger bodies, finely conical at both ends.
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.
And now his mustache begins to be almost visible to the naked eye, whereupon he immediately takes to brandy-and-sodas and fancies himself a man.
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.
The Met Office website stated that the Zil-hajj moon would be visible to the naked eye in Karachi for 40 minutes after sunset today.
You can't see it on the video but to the naked eye it was very smooth and curved, it even kind of split into two.
Edinburgh, Nov 21 ( ANI ): Golf's two governing bodies, R and A and USGA, have reportedly decided not to penalise players from January 1, 2014, under the Rules of Golf if their ball moves and it was not obvious to the naked eye.
Predicted to be visible to the naked eye, object comet C/2011 L4 Pan-STARRS is set to make an appearance.
The sungrazing comet C/2012 S1 (ISON), which is predicted to be extremely bright, will be visible to the naked eye in Bulgaria at the end of November 2013, according to local experts.
So to the naked eye from any given location in Earth's Northern Hemisphere, Polaris essentially remains always at the same altitude and the same direction--due north.
Summary: The company behind a so-called 'invisibility cloak', intended for military vehicles, has admitted it is not one hundred per cent invisible to the naked eye.