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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.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Examples from the Web for naked eye

Historical Examples of naked eye

  • Compare the naked-eye appearances of the cultures from day to day.

    The Elements of Bacteriological Technique

    John William Henry Eyre

  • Of those that are known, perhaps one in twelve develops into a naked-eye comet, and in some years six or seven will be discovered.

    Astronomy

    David Todd

  • This nebula is a naked-eye object near Eta Andromed, and it is often mistaken for a comet.

    Astronomy

    David Todd

  • Stars visible without the aid of a telescope are referred to usually as "naked-eye stars."

    Astronomy for Young Folks

    Isabel Martin Lewis

  • These were before the invention of the telescope, and consequently contained only naked-eye stars.