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Visual hallucinations   Motor symptoms

Visual Illusions

Artists inspired by migraine Entry to art contest Migraine Images Migraine art: Metamorphopsia.

Visual illusions of diplopia (left), corona phenomenon (middle) and metamorphopsia (right). Left: © 2004 GlaxoSmithKline; middle and right: © 2004 Migraine Action Association and Boehringer Ingelheim.

In contrast to a visual hallucination which is defined as a visual perception that is not associated with external visual stimuli, a visual illusion is a distortion or modification of a real visual image (Pelak and Liu, 2004). The following webpages [Pending] will provide examples from the medical literature and from migraine sufferers' self-reports in the internet for various types of visual illusions that may occur as visual migraine aura symptoms.

  • Dysmetropsia, i.e., macropsia, micropsia, pelopsia and teleopsia (objects appearing larger, smaller, nearer and further away)
  • Tilted vision, inverted vision and other forms of illusory rotation
  • Diplopia (double vision)
  • Polyopia (vision of multiple images)
  • Visual perseveration, i.e., prolonged afterimages, palinopsia (the persistence or reappearance of an image of a previously viewed object), illusory visual spread (the illusory extension of the visual perception over an area greater than that which the stimulus-object would be expected to excite)
  • Cinematographic vision (visual illusion whereby the normal perception of moving objects is replaced by seeing a series of "stills" as in a film run too slowly)
  • Corona phenomenon (extra-contour around objects)
  • Metamorphopsia (distorted vision)
  • Facial metamorphopsia (distorted vision of human faces)
  • Mosaic illusion (fracture of the visual image into pieces dovetailed together as in a mosaic)
  • Autokinesis (illusion of apparent movement of stationary objects)

References

Norton JW, Corbett JJ. Visual perceptual abnormalities: hallucinations and illusions. Semin Neurol 2000, 20: 111-121.
Pelak VS, Liu GT. Visual hallucinations. Curr Treat Options Neurol 2004; 6: 75-83. (See also here.)

Author: Klaus Podoll
Last modification of this page: Friday March 25. 2005

Visual hallucinations   Motor symptoms
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