Patterns of vision loss predisposing to charles bonnet illusions

Autor: Hermann Krastel, Lidia Golubkina, I Frisch, Jb Jonas, Sc Beutelspacher, G. H. Kolling
Rok vydání: 2010
Předmět:
Zdroj: Acta Ophthalmologica. 88
ISSN: 1755-375X
Popis: Purpose To find out criteria of visual impairment predisposing to Charles Bonnet illusions (CBI) Methods In a retrospective study, exemplary cases of retinal, optic nerve, and visual pathway diseases are analyzed for common criteria likely to predispose for CBI experienced by these patients. Results AMD: OD disciform macular scar ; OS exudative macuolpathy, recent hemorrhage. Wallpaper- and landscape- like illusions Serpiginous choroidopathy: OU atrophic lesions extending from the peripapillary region into the macula. Flower-bed illusions Retinitis pigmentosa: widespread involvement of retinal midperiphery OU. Transitory illusions of human beings and furniture Ethambutole - opticopathy: Central scotoma OU, VA FC. Illusions of coloured diamonds History of recurrent TIA episodes: normal visual field OU; transitory illusions of coloured and moving lanterns Right parietal ischemic focus: Lower left quadrantanopia OU. Distorted and alienated objects Bilateral carotid stenosis, left vertrebralis hypoplasia, bilateral ischemic occipital foci: Cortical blindness and Anton’s syndrome. The patient reports on skimming through an illustrated book. Conclusion CBI’s arise if severe failures in photoreception or signal conduction affect congruent areas within both visual fields. Out of these regions, no visual information from the outside world comes to conscience. CBI’s tend to fill in binocular deep scotomas. These filing-ins are not specific to particular diseases or distinct regions of the optic pathways. They are cerebral substitutes for real vision, coming from visual memory.
Databáze: OpenAIRE
Externí odkaz: