There are two different categories of visual hallucinations that a person with CBS may experience, although in some cases a person may experience a range of both. Generally, you will be aware that what you are seeing in these hallucinations is not real. CBS is a reaction of the healthy brain, which fills in the gaps left by sight loss.įor some people, they can be a strange, startling or frightening experience, but these events often become less frequent over time. What is seen depends on which part of the brain is firing at that moment. For some reason we have yet to discover, the brain does not stop. It happens because, as sight diminishes, the messages – which run all the time from the retina in the eye to the visual cortex in the brain – slow or stop. The hallucinations it causes range from disturbing to terrifying but it is important to remember that CBS is not a mental health condition and there is nothing wrong with the mind. Visual hallucinations are known as an event whereby a person can see an object or objects which are not actually there. The vision loss can be due to eye disease, cancer, accident, stroke, diabetes or another condition which damages the optic nerve. It develops in some people, of any age, who have lost over 60% of vision. First noted in 1760, Charles Bonnet Syndrome (CBS, also known as phantom vision syndrome) describes the condition in which visual hallucinations are experienced by people of any age living with significant sight loss.
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