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Prosopometamorphopsia (PMO), also referred to as Demon' Facial Visual Perception Disorder, is a rare visual disorder that is often mistaken for mental illness. It is a  visual disorder in which human faces appear distorted in shape, texture, position, or color. Most patients with PMO see these distorted facial features all the time, whether they are looking at a face in person, on a screen, or paper.

A substantial number of people have been misdiagnosed, often with schizophrenia or some sort of psychotic episode, and some have been put on antipsychotics despite the fact they've just had some little tweak in their visual system. PMO can occur in the context of head trauma, as well as cerebral infarction, epilepsy, migraine, and hallucinogen-persisting perception disorder. The condition can also manifest without detectable structural brain changes.