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

This hidden world, known as the microbiome, cannot be seen with the naked eye but plays a central role in reef health and function.

From Science Daily • May 8, 2026

To the naked eye, they may have looked similar.

From Salon • Apr. 17, 2026

Grimes said it was almost impossible to see a micrometeorite with the naked eye.

From BBC • Apr. 4, 2026

For nearly 150 years, paleontologists in this region have relied largely on surface collecting methods, which tend to yield larger fossils visible to the naked eye while tiny specimens remain hidden.

From Science Daily • Mar. 3, 2026

The prints, not noticeable to the naked eye, registered on film; indeed, the delineating glare of a flashbulb had revealed their presence with superb exactness.

From "In Cold Blood" by Truman Capote