Visual release hallucinations, also known as Charles Bonnet syndrome or CBS, are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations.

when a subject with psychosis endures visual experiences which occur in the absence of corresponding external stimulation of the eye in the awake state, in which the subjects do not feel like they have control over, with sufficient sense of reality to resemble a authentic visual perception.