Hallucinations et illusions visuelles, des symptomes souvent meconnus du praticien. [Visual hallucinations and illusions, symptoms frequently misdiagnosed by the practitioner]
Details
Serval ID
serval:BIB_5E4E1D31C204
Type
Article: article from journal or magazin.
Publication sub-type
Review (review): journal as complete as possible of one specific subject, written based on exhaustive analyses from published work.
Collection
Publications
Institution
Title
Hallucinations et illusions visuelles, des symptomes souvent meconnus du praticien. [Visual hallucinations and illusions, symptoms frequently misdiagnosed by the practitioner]
Journal
Klinische Monatsblatter fur Augenheilkunde
ISSN
0023-2165 (Print)
Publication state
Published
Issued date
05/1999
Volume
214
Number
5
Pages
324-7
Notes
English Abstract
Journal Article
Review --- Old month value: May
Journal Article
Review --- Old month value: May
Abstract
INTRODUCTION: Visual hallucinations or illusions are not a rare symptom. However, they are often unrecognized. Unawareness of the meaning of these symptoms often mislead both the patient and his physician. PURPOSE: To define and describe the types of visual illusions and hallucinations which can be commonly encountered in neuro-ophthalmological practice. METHODS: Overview article. RESULTS: Hallucinations are a perception not based on sensory input, whereas illusions are a misinterpretation of a correct sensory input. Both phenomenon can be due to medication or drug, or to an altered mental status. Visual hallucinations can be formed (objects, people) or unformed (light, geometric figures). They can be generated either by a lesion on the antechiasmatic pathway, by a seizure phenomenon, by a migrainous phenomenon, or by a release phenomenon secondary to visual differentiation. Investigations will be directed towards a retinopathy, an optic neuropathy, a chiasmal or retrochiasmal lesion, or a bilateral antechiasmal lesion (Charles Bonnet syndrome). Visual illusions include meta-morphopsias, micro- macropsias, polyopia, palinopsia (visual perseveration), achromatopsia, Pulfrich phenomenon, or subjective vertical deviation. Illusions can be due to lesions of the retina, the optic nerve, the visual cortex (primary or associative), or the graviceptive pathways. CONCLUSIONS: As most patients do not spontaneously mention their symptoms, history taking is essential. The first step is to rule out medication or an altered mental status as the possible cause of these symptoms. Then, careful visual function examination should provide a good insight in the location of the lesion.
Keywords
Diagnosis, Differential
Hallucinations/*diagnosis/etiology
Hemianopsia/diagnosis/etiology
Humans
*Optical Illusions
Patient Care Team
Perceptual Disorders/*diagnosis/etiology
Psychotic Disorders/diagnosis/etiology
Vision Disorders/*diagnosis/etiology
Pubmed
Web of science
Create date
28/01/2008 12:37
Last modification date
20/08/2019 14:16