Micropsia

Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by either optical distortion of images in the eye (as by glasses or certain ocular conditions) or by a neurological dysfunction. The condition of micropsia can be caused by more factors than any other visual distortion. Factors known to cause micropsia include traumatic brain injury, swelling of the cornea, epilepsy, migraines, prescription and illicit drug use, retinal edema, macular degeneration, central serous chorioretinopathy, brain lesions, and psychological factors. Dissociative phenomena are linked with micropsia, which may be the result of brain lateralization disturbance. Specific types of micropsia include hemimicropsia, a form of micropsia that is localized to one hemisphere of the brain and can be caused by brain lesions. Related visual distortion conditions include macropsia, a less common condition with the reverse effect, and Alice in Wonderland Syndrome, a condition that has symptoms that can include both micropsia and macropsia.