Visual release hallucinations
Visual release hallucinations, also known as Charles Bonnet syndrome (CBS), are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations. First described by Charles Bonnet in 1760, the term Charles Bonnet syndrome was first introduced into English-speaking psychiatry in 1982.
Source: Wikipedia — Visual release hallucinations (CC BY-SA 4.0)