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optical illusion

Line breaks: op|tic¦al il¦lu|sion

Definition of optical illusion in English:

noun

1Something that deceives the eye by appearing to be other than it is.
Example sentences
  • It is not an optical illusion or trick photography.
  • Consider the famous optical illusion of two identical lines where one has concave triangles at its edges whilst the other has convex triangles at either end.
  • The reason many thought it was magic was because the largest of the tattoos that covered its body, as well as the vast majority, were optical illusions, causing something of a hypnosis to occur with those who dared to stare long enough.
1.1An experience of seeming to see something which does not exist or is other than it appears.
Example sentences
  • Everyone, from young children to my 94 year-old grandmother, is fascinated by optical illusions.
  • For instance, a very nice test of a robotic vision system would be to see whether it was susceptible to the same optical illusions that we are.
  • This results in an optical illusion known as a mirage.

Definition of optical illusion in:

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