teleopsia

teleopsia
   Also known as teliopsia and telopsia. All three terms stem from the Greek words tèle (far), and opsis (seeing). The term teleopsia was introduced in or shortly before 1949 by the British neurologist Macdonald Critchley (1900-1997) to denote a visual distortion in which objects appear to be either further away, or closer than they actually are. The phenomenon itself has been described at least as far back as 1916, judging by its description avant la lettre by the British neurologist Samuel Alexander Kinnier Wilson (18781937). Teleopsia may present either as an isolated symptom or as part of a cluster of symptoms called the * Alice in Wonderland syndrome. Eti-ologically, it is associated primarily with * aurae occurring in the context of paroxysmal neurological disorders such as migraine and epilepsy, andwiththe useof *hallucinogens such as LSD and mescaline. Teleopsia is classified either as a *dysmetropsia or a *metamorphopsia. Sometimes the term * porropsia is used as a synonym, although phenomenologically the two symptoms are not identical (porropsia being defined as a condition in which stationary objects are perceived as receding into the distance). Nor should teleopsia be confused with * micropsia, a visual distortion in which objects and stimuli are perceived as smaller, but not necessarily as further away. Today the term telopsia is commonly used to denote the condition in which objects appear to be further way.
   References
   Critchley, M. (1949). Metamorphopsia of central origin. Transactions of the Ophthalmologic Society of the UK, 69, 111-121.
   Ey, H. (2004). Traité des hallucinations. Tome 1. Paris: Claude Tchou pour la Bibliothèque des Introuvables.
   Klee, A., Willanger, R. (1966). Disturbances of visual perception in migraine. Acta Neurolog-ica Scandinavica, 42, 400-414.
   Wilson, S.A.K. (1916). Dysmetropsia and its pathogenesis. Transactions ofthe Ophthalmological Society UK, 36, 412-444.

Dictionary of Hallucinations. . 2010.

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