Illusory<unk>  is a dysfunction of visual perception, resulting from diffuse, persistent alterations in neuronal excitability that affect physiological mechanisms of light or motion perception. Illusory<unk>  is caused by migraines, visual snow, HPPD, prescription drugs, head trauma, or may be idiopathic. Trazodone, nefazodone, mirtazapine, topiramate, clomiphene, oral contraceptives, and risperidone have been reported to cause illusory<unk> . A patient frequently has multiple types of illusory<unk> , which represent dysfunctions in both light and motion perception. Light and motion are processed via different pathways, suggesting diffuse or global excitability alterations.
Palinopsia
Photopsia
Micropsia
Dysmorphopsia
Akinetopsia
Pelopsia
Agraphesthesia
Oscillopsia