Charles Bonnet syndrome
Pronunciation: SHARL bon-NAY
Visual hallucinations occurring in individuals with significant vision loss, typically in elderly patients with eye disease.
Full Definition
Charles Bonnet syndrome involves complex visual hallucinations experienced by individuals with severe vision loss, most commonly affecting elderly patients with age-related macular degeneration, glaucoma, or diabetic retinopathy. Named after the Swiss philosopher who first described the condition in 1760, the syndrome is characterized by vivid, detailed visual hallucinations that patients typically recognize as unreal. Hallucinations may include people, animals, geometric patterns, or landscapes, and often occur in well-lit conditions. The phenomenon results from the brain's attempt to compensate for reduced visual input by generating its own images. Understanding this condition is crucial in geriatric settings to distinguish these benign hallucinations from those associated with psychiatric illness or dementia.
Usage
Usage note: Always assess for underlying visual impairment when evaluating elderly patients reporting visual hallucinations.
In Context
- "The patient's Charles Bonnet syndrome caused distressing hallucinations of children in her living room despite severe macular degeneration." — Ophthalmology consultation note
- "Charles Bonnet syndrome hallucinations are typically more complex and vivid than those seen in psychiatric conditions." — Geriatric psychiatry assessment