Micropsia is a condition in which visual objects are perceived to be smaller than actual size.
Micropsia can result from disorders involving areas throughout the visual system. It has been associated with disease of the globe and retina and with lesions of the central nervous system. Micropsia can be a clinical feature of migraine, stroke, epilepsy, or demyelinating disease. It can occur in the setting of macular degeneration, central serous chorioretinopathy, ocular myasthenia, and aftermath of retinal detachment repair. Micropsia can also be psychogenic in origin. Micropsia is frequently transient.
In the eye, micropsia may be caused by separation of retinal rod and cone cells via swelling or edema. With decreased density of photoreceptors, an observed object is perceived as being smaller than usual. Micropsia is also thought to occur as a result of impairment of ocular accommodation (i.e., focus) caused by paralysis or natural functional variation. In...