Micropsia refers to the phenomenon of items appearing to the eye as being smaller than they really are. This phenomenon can be caused by physical distortions of the eye such as swelling of the cornea, changes to the retina (which can occur with retinal edema), macular degeneration, or other serious retinopathies. Micropsia can also occur from physical damage to the brain from traumatic brain injury or stroke. It can also be a symptom associated with epilepsy, migraines, prescription drug use, and illicit drug use. Psychological factors can also be a cause of micropsia. It can also be a side effect of wearing eyeglasses. It is the opposite of macropsia and is sometimes called "Alice in Wonderland" syndrome which combines both micropsia and macroscopia.

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