
An optical illusion (also called a visual illusion) is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a perception that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that c...
Found on
http://en.wikipedia.org/wiki/Optical_illusion

(from the article `illusion`) Numerous optical illusions are produced by the refraction (bending) of light as it passes through one substance to another in which the speed of ... apparent systems of long, straight linear markings on the surface of Mars that are now known to be illusions caused by the chance alignment of ... Other com...
Found on
http://www.britannica.com/eb/a-z/o/24

A picture or figure that deceives or confuses the eye and/or brain. Categorization of optical illusions is difficult because several underlying mechanisms may contribute to an effect, or the cause of the illusions may not be completely understood. See individual entries in the table below for detail...
Found on
http://www.daviddarling.info/encyclopedia/O/optical_illusion.html

[
n] - an optical phenomenon that results in a false or deceptive visual impression
Found on
http://www.webdictionary.co.uk/definition.php?query=optical%20illusion

an image that deceives reality
Found on
https://sciencetrek.org/sciencetrek/topics/television/glossary.cfm
noun an optical phenomenon that results in a false or deceptive visual impression
Found on
https://www.encyclo.co.uk/local/20974

Scene or picture that fools the eye. An example of a natural optical illusion is that the Moon appears bigger when it is on the horizon than when it is high in the sky
Found on
https://www.encyclo.co.uk/local/21221
No exact match found.