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.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use naked eye in a sentence
Some of the effects of the economic crunch were apparent to the naked eye at Art Basel.
The exaggerated reflection suddenly revealed that my pores were hardly as infinitesimal as my naked eye had led me to believe.
Indeed, to the naked eye, stocks are stunningly cheap—Wall Street blue chips selling at Wal-Mart prices.
Remnants of food from previous meals can be detected with the naked eye or microscopically.A Manual of Clinical Diagnosis | James Campbell Todd
We were constantly so near Terra del Fuego that we could make out every bush with the naked eye.A Woman's Journey Round the World | Ida Pfeiffer
The naked eye can see at best in the part of the heavens visible from any one point not more than thirty thousand stars.Outlines of the Earth's History | Nathaniel Southgate Shaler
But all around these star-clouds, or Nebulae as they are called, the clear blue sky is discovered by the naked eye.Gospel Philosophy | J. H. Ward
In that year a parhelion appeared undistinguishable by the naked eye from the real sun.The Every Day Book of History and Chronology | Joel Munsell