en.wikipedia.org/…/Hallucinogen_persisting_percep…

Hallucinogen persisting perception disorder (HPPD) is a non-psychotic disorder in which a person experiences lasting or persistent visual hallucinations or perceptual distortions after using drugs.[1] This includes after psychedelics, dissociatives, entactogens, tetrahydrocannabinol (THC), and SSRIs.[2][3] Despite being a hallucinogen-specific disorder, the specific contributory role of psychedelic drugs is unknown. Symptoms may include visual snow, trails and after images (palinopsia), light fractals on flat surfaces, intensified colors, altered motion perception, pareidolia, micropsia, and macropsia.[3] Floaters and visual snow may occur in other conditions.[4][5]