<unk>  (Greek: palin for "again" and opsia for "seeing") is the persistent recurrence of a visual image after the stimulus has been removed.<unk>  is not a diagnosis; it is a diverse group of pathological visual symptoms with a wide variety of causes. Visual perseveration is synonymous with<unk> . In 2014, Gersztenkorn and Lee comprehensively reviewed all cases of<unk>  in the literature and subdivided it into two clinically relevant groups: illusory<unk>  and hallucinatory<unk> . Hallucinatory<unk> , usually due to seizures or posterior cortical lesions, describes afterimages that are formed, long-lasting, and high resolution. Illusory<unk> , usually due to migraines, head trauma, prescription drugs, visual snow or hallucinogen persisting perception disorder (HPPD), describes afterimages that are affected by ambient light and motion and are unformed, indistinct, or low resolution.
Palinopsia
Photopsia
Micropsia
Dysmorphopsia
Akinetopsia
Pelopsia
Agraphesthesia
Oscillopsia