Visual release hallucinations [SEP] named after
Visual release hallucinations
Visual release hallucinations, known as Charles Bonnet Syndrome, are a type of psychophysical visual disturbance and the experience of complex visual hallucinations in a person with partial or severe blindness. 
First described by Charles Bonnet in 1760, it was first introduced into English-speaking psychiatry in 1982. A related type of hallucination that also occurs with lack of visual input is the closed-eye hallucination.
Signs and symptoms.
People with significant vision loss may have vivid, complex recurrent visual hallucinations (fictive visual
of normal inhibitory processes on cortical input to visual association areas, leading to complex hallucinations as a release phenomenon.
The third mechanism has to do with the reticular activating system, which plays a role in the maintenance of arousal. Lesions in the brain stem can cause visual hallucinations. Visual hallucinations are frequent in those with certain sleep disorders, occurring more often when drowsy. This suggests that the reticular activating system plays a part in visual hallucinations, although the precise mechanism has still not fully been established.
Prevalence.