Dictionary

optical illusion

noun

: something that looks different from what it is : something that you seem to see but that is not really there

Full Definition of OPTICAL ILLUSION

:  illusion 2a(1)

Examples of OPTICAL ILLUSION

  1. The closer building looks larger than the farther one, but it's just an optical illusion. The two buildings are actually the same size.

First Known Use of OPTICAL ILLUSION

1794

optical illusion

noun    (Medical Dictionary)

Medical Definition of OPTICAL ILLUSION

:  visual perception of a real object in such a way as to misinterpret its actual nature

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April 20, 2015
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