An optical illusion (also called a visual illusion ) is characterized byvisually perceived images that differ from objective reality. Theinformation gathered by the eye is processed in the brain to give apercept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and cognitive illusions where the eye and brain make unconscious inferences.

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