The diagnosis of Charles Bonnet syndrome in visual field defects

✓ The development of visual hallucinations after loss of vision is known as the Charles Bonnet syndrome. This phenomenon was first described in 1760 by Charles Bonnet and others during their observations of elderly patients with degeneration of the retina or cornea. To date a clear association between visual hallucinations and neurosurgical procedures has not been reported. Because of their clear demarcation, however, surgical lesions in the cerebrum offer a unique opportunity to determine the pathoanatomical aspects of visual hallucinations. During a 3-year period, 41 consecutive patients who acquired visual field defects after neurosurgery were examined for the occurrence of visual hallucination. Postoperatively, four of these patients experienced visual hallucinations. In two of them an upper quadrantanopia developed after the patients had undergone selective amygdalohippocampectomy. In the other two patients a complete hemianopia developed, in one case after resection of a parietal astrocytoma and in the other after resection of an occipital glioblastoma multiforme. The visual hallucinations were transient and gradually disappeared between 4 days and 6 months postoperatively. The patients were aware of the fact that their hallucinations were fictitious and displayed no psychosis. Electroencephalographic recordings were obtained in only two patients and epileptic discharges were found. Deafferentiation of cortical association areas may lead to the spontaneous generation of complex visual phenomena. In the present series this phenomenon occurred in approximately 10% of patients with postoperative visual field defects. In all four cases the central optic radiation was damaged between the lateral geniculate nucleus and the primary visual cortex. The complex nature of the visual hallucination indicates that they were generated in visual association areas.

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Charles Bonnet Syndrome in Patients With Visual Field Defects—Are Hallucinations Good or Bad?

Journal of Neurosurgery ◽

10.3171/jns.2005.103.1.0193 ◽

2005 ◽

Vol 103 (1) ◽

Cited By ~ 1

Keyword(s):

Visual Field ◽

Visual Field Defects ◽

Charles Bonnet Syndrome ◽

Field Defects

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Vision restoration therapy for patients with visual field defects after cerebral lesion - therapy related objective and subjective changes in visual functions

Aktuelle Neurologie ◽

10.1055/s-2004-833406 ◽

2004 ◽

Vol 31 (S 1) ◽

Author(s):

S Kenkel ◽

E Kasten ◽

B Sabel

Keyword(s):

Visual Field ◽

Visual Field Defects ◽

Cerebral Lesion ◽

Visual Functions ◽

Vision Restoration ◽

Field Defects

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Long-term stimulation of residual function in patients with visual field defects after post-chiasmatic lesions

Aktuelle Neurologie ◽

10.1055/s-2004-833405 ◽

2004 ◽

Vol 31 (S 1) ◽

Author(s):

I Mueller ◽

C Gall ◽

E Kasten ◽

BA Sabel

Keyword(s):

Visual Field ◽

Visual Field Defects ◽

Residual Function ◽

Field Defects ◽

Stimulation Of

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Automated Static Perimetry for diagnostics of visual field defects in glaucoma

Oftalmologicheskii Zhurnal ◽

10.31288/oftalmolzh201916571 ◽

2018 ◽

Vol 78 (1) ◽

pp. 65-71

Author(s):

S. Slobodyanyk ◽

Keyword(s):

Visual Field ◽

Visual Field Defects ◽

Static Perimetry ◽

Automated Static Perimetry ◽

Field Defects

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Central Visual Field Defects in Patients with Distinct Glaucomatous Optic Disc Phenotypes

American Journal of Ophthalmology ◽

10.1016/j.ajo.2020.10.015 ◽

2021 ◽

Vol 223 ◽

pp. 229-240

Author(s):

Eren Ekici ◽

Sasan Moghimi ◽

Huiyuan Hou ◽

James Proudfoot ◽

Linda M. Zangwill ◽

...

Keyword(s):

Visual Field ◽

Optic Disc ◽

Visual Field Defects ◽

Central Visual Field ◽

Field Defects

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The relationship between intraocular pressure and visual field defects

Experimental Eye Research ◽

10.1016/0014-4835(75)90185-2 ◽

1975 ◽

Vol 20 (2) ◽

pp. 182

Author(s):

A.I. Friedmann

Keyword(s):

Intraocular Pressure ◽

Visual Field ◽

Visual Field Defects ◽

The Relationship ◽

Field Defects

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Computerized color perimetry in multiple sclerosis

Multiple Sclerosis Journal ◽

10.1177/135245859800400207 ◽

1998 ◽

Vol 4 (2) ◽

pp. 79-84 ◽

Cited By ~ 6

Author(s):

N Accornero ◽

S Rinalduzzi ◽

M Capozza ◽

E Millefiorini ◽

G C Filligoi ◽

...

Keyword(s):

Visual Field ◽

Statistical Difference ◽

Cost Effective ◽

Quantitative Information ◽

Field Analysis ◽

Visual Field Defects ◽

Highly Sensitive ◽

The Subject ◽

Color Perimetry ◽

Field Defects

Color visual field analysis has proven highly sensitive for early visual impairments diagnosis in MS, yet it has never attained widespread popularity usually because the procedure is difficult to standardize, the devices are costly, and the test is fatiguing. We propose a computerized procedure running on standard PC, cost effective, clonable, and easy handled. Two hundred and sixty-four colored patches subtending 18 angle of vision, with selected hues and low saturation levels are sequentially and randomly displayed on gray equiluminous background of the PC screen subtending 2486408 angle of vision. The subject is requested to press a switch at the perception of the stimulus. The output provides colored maps with quantitative information. Comparison between normals and a selected population of MS patients with no actual luminance visual field defects, showed high statistical difference.

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