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Visual Hallucinations with Poor Vision: The Charles Bonnet Syndrome

Charles Bonnet Syndrome

Who is Charles Bonnet?  He was a Swiss naturalist, philosopher and biologist (1720-1793), who first described the hallucinatory experiences of his 89-year-old grandfather, who was nearly blind in both eyes from cataracts.   The Charles Bonnet Syndrome is now used to describe simple or complex hallucinations in people who have impaired vision.  


People who experience these hallucinations know they aren't real.  These hallucinations are only visual, and they don't involve any other senses. These images can be simple patterns or more complex, like faces or cartoons.  These hallucinations are more common in people who have retinal conditions that impair their vision, like macular degeneration, but can occur in any condition that damages the visual pathway.  The prevalence of Charles Bonnet syndrome among adults 65 years and older with significant vision loss is reported to be between 10% and 40%.  This condition is probably under reported because people may be worried about being labeled as having a psychiatric condition. 


The causes of these hallucinations are controversial, but the most supported theory is deafferentation, which is loss of signals from eye to the brain and then, in turn, the visual areas of the brain discharge neural signals to create images to fill the void.  This is similar to the phantom limb syndrome, when a person feels pain where a limb was once present.  In general, the images that are produced by the brain are usually pleasant and non-threatening.

Treatment and prognosis

If there is a reversible cause of decreased vision, for example, significant cataract, then once the decreased vision is treated, the hallucinations should stop.

There is no proven treatment for the hallucinations as a result of permanent vision loss but there are some techniques to manage the condition. 

  • Talking about the hallucinations and understanding that it is not due to mental illness can be reassuring.
  • Changing the environment or lighting condition.If you are in a dimly lit area, then switch on the light and vice versa. 
  • Moving your eyes to the left and right and looking around without moving your head and blinking have been reported as helpful.
  • Resting and relaxing.The hallucinations may be worse when you are tired or sick.
  • Taking antidepressants and anticonvulsants have been used but have questionable efficacy. 

Over time, the hallucinations become more manageable and may decrease or even stop after a couple of years.

If you experience any of these symptoms, please get evaluated by your eye doctor to make sure there is not a treatable eye condition.

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Tuesday, 07 December 2021

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