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UNIS Psych Ward

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Optical Illusions

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 percept that does not tally with a physical measurement of the stimulus source.

There are three main types:

  1. Literal optical illusions that create images that are different from the objects that make them,
  2. Physiological illusions that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement),
  3. Cognitive illusions where the eye and brain make unconscious inferences. They can also be known as “mind games”.
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Physiological Illusions
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Cognitive Illusions
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Literal Illusions
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