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 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.
Medical condition (new).caption: 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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~14 min read

Article

23 sections

Contents

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 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.