micropsia
Sign in to saveMicropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous retinopathy), by changes in the brain (such as from traumatic brain injury, epilepsy, migraines, or drugs), and from psychological factors. Dissociative phenomena are linked with micropsia, which may be the re
Key facts
- Medical condition (new).name
- Micropsia
- Medical condition (new).image
- Alice par John Tenniel 11.png
- Medical condition (new).image_size
- 300px
- Medical condition (new).alt
- Illustration from Lewis Carroll's ''Alice's Adventures in Wonderland'' depicting the title character seated slouched over in a tiny room. Alice is positioned awkwardly with her weight supported partially by her left forearm, which rests on the floor and spans nearly half of the room's length. Her head is ducked beneath the low ceiling and her right arm reaches outside, resting on an open window's sill. The folds of Alice's dress occupy much of the remaining free space in the room.
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- The perception a person can have due to symptoms of pronounced micropsia. See § Comparison with ''Alice's Adventures in Wonderland'', below. Image from that same novel.
- Medical condition (new).specialty
- Ophthalmology
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Article
23 sectionsContents
- Signs and symptoms
- Cause
- Diagnosis
- Definition
- Differential diagnosis
- Migraines
- Seizures
- Drug use
- Psychological factors
- Epstein-Barr virus infection
- Retinal edema
- Macular degeneration
- Central serous chorioretinopathy
- Brain lesions
- Treatment
- Epidemiology
- Society and culture
- Comparison with ''Alice's Adventures in Wonderland''
- Comparison with ''Gulliver's Travels''
- Research
- See also
- References
- External links
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 optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous retinopathy), by changes in the brain (such as from traumatic brain injury, epilepsy, migraines, or drugs), and from psychological factors. Dissociative phenomena are linked with micropsia, which may be the result of brain-lateralization disturbance.
Micropsia is also commonly reported when the eyes are fixating at (convergence), or focusing at (accommodation), a distance closer than that of the object in accord with Emmert's law. Specific types of micropsia include hemimicropsia, a form of micropsia that is localized to one half of the visual field and can be caused by brain lesions in one of the cerebral hemispheres.