- 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.ReferencesCritchley, 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. J.D. Blom. 2010.
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teleopsia — An error in judging the distance of objects arising from lesions in the parietal temporal region. [G. tele, distant, + opsis, vision] * * * tele·op·sia (tel″e opґse ə) [tele + opsia] a visual disturbance in which objects appear to be… … Medical dictionary
porropsia — The term porropsia comes from the Latin verb portare (to carry, to transport, to take away) and the Greek verb opsis (seeing). It translates loosely as seeing things being carried away and is used to denote a visual distortion in which… … Dictionary of Hallucinations
Micropsia — An illustration depicting the symptoms of micropsia from Lewis Carroll s 1865 novel Alice s Adventures in Wonderland. ICD 10 H … Wikipedia
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corona phenomenon — The term corona phenomenon is indebted to the Latin noun corona, which means crown. It was introduced in or shortly before 1966 by the Danish neuroscientists Axel Klee (1933 1982?) and Rolf Willanger to denote a *visual illusion consisting of… … Dictionary of Hallucinations
Dodgson, Charles Lutwidge — (1832 1898) Better known as Lewis Carroll. A British mathematician, and member of the Society for Psychical Research (SPR), as well as an author of children s books, who is probably best known for his Alice s Adventures in Wonderland.As… … Dictionary of Hallucinations
dysmetropsia — The term dysmetropsia comes from the Greek words dus (bad), metron (yardstick), and opsis (seeing). It is used to denote a distorted perception of image size. The term dysmetropsia was introduced in or shortly before 1916 by the British… … Dictionary of Hallucinations
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metamorphopsia — The term metamorphopsia comes from the Greek words metamorphoun (to change the form) and opsis (seeing). It translates roughly as seeing an altered form . It is not clear who introduced the term, but it appears in a medical lexicon as early as … Dictionary of Hallucinations