3/25/2023 0 Comments Visual hallucinationThree decades later, de Morsier tried to remove ocular disease from the syndromic definition and considered Bonnet hallucinations as visual hallucinations occurring among the elderly with intact cognition, regardless of etiology ( 27).īonnet syndrome (sometimes referred to as Charles Bonnet syndrome) is now most commonly considered to refer to visual hallucinations in visually impaired individuals with full alertness, unimpaired cognition, and no psychosis (and this is the operational definition used for this article) ( 38 109 129 128 110 07 74 80 33 19 77 29 55 138 20 87). In 1936, de Morsier eponymously recognized Bonnet's report and designated Bonnet syndrome as a syndrome of visual hallucinations in elderly persons with ocular lesions and intact cognition ( 26 33). In the late 18th century, Charles Bonnet reported visual hallucinations in elderly persons who were cognitively normal (ie, in Bonnet's 89-year-old grandfather Charles Lullin and, later, in Bonnet himself) ( 10 08 29 55 46). ![]() Although there is no definitive treatment available for Bonnet syndrome, various ophthalmologic interventions, behavioral strategies, and pharmacologic agents have been used to try to reduce or relieve symptoms.Bonnet hallucinations are thought to result from a "release" mechanism associated with modality-specific sensory deprivation, ie, "phantom vision" akin to phantom limbs in patients with loss of somatosensory input after an amputation.Although Bonnet syndrome is most commonly identified in patients with bilaterally decreased central visual acuity, similar phenomena also occur in patients with retrochiasmal visual field defects.Many elderly patients with such hallucinations are concerned that these indicate mental illness or the incipient development of dementia. Bonnet syndrome frequently goes unrecognized in clinical practice due to lack of awareness among providers and to patients' reluctance to report hallucinatory experiences. ![]()
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