naked eye

Idioms  

1. 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.

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Example Sentences

Lunar eclipses are safe to view with the naked eye as they only reflect sunlight.

From BBC

A view that would not be possible with the naked eye.

From BBC

Four were visible to the naked eye, while Saturn sat low on the horizon and Uranus and Neptune required a telescope.

From BBC

"But there are some very rare and amazing occasions where you do see that colour and texture with the naked eye."

From BBC

It will be the third brightest object in the sky after the Moon and Venus and appear as a single, fast-moving bright star, easily spotted with the naked eye.

From BBC