naked eye

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*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

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
References in classic literature ?
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.
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.
The thrilling show, quite visible to the naked eye, lasted for several hours, as pillars of light danced across the dark and moonless night.
Blood in the urine, which may or may not be visible to the naked eye.
Unlike compromised incandescent and prior LED alternatives with light levels that were only useful as two-way bulbs, the 3-Way Cree LED Bulb provides three light levels distinctly visible to the naked eye, delivering the perfect illumination for any application from task lighting to ambient lighting.
The scientists, whose findings appear in the journal Nature, warned that what they observed was not visible to the naked eye but could only be measured using specialised equipment.
While the Perseids meteor shower is an annual event between mid-July and mid-August, the best views were on Monday, with as many as 60 meteors an hour visible to the naked eye.
Melbourne, May 19 ( ANI ): NASA has revealed that a boulder-sized meteor slammed into the moon in March, causing an explosion so bright that it was visible to the naked eye on Earth.
The Heisenberg uncertainty principle, a tenet of quantum mechanics, has been demonstrated at scales visible to the naked eye.
North of the equator, Pan-STARRS will be visible to the naked eye starting on Thursday, when it will appear very low in the horizon just after the sun sets.
In late 2013 Comet ISON is expected to pass extremely close to the sun, putting on a light show expected to be visible to the naked eye for skywatchers on Earth from early November through the first few weeks of January 2014.
The galaxy is just about visible to the naked eye from a reasonably dark sky M31 is arguably one of the most distant object visible to the naked eye at 2.
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.
Jupiter is also in our neck of the woods and visible to the naked eye on October 29.
They will then be shown the condition of their hair, including the roots, which are not visible to the naked eye.