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A disorder characterized by double vision.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a disturbance of vision consisting in the doubling of seen objects. Most often diplopia occurs when there is weakening (paresis) or paralysis of one of the oculomotor muscles, when coordinated, harmonious movements of the eyeballs are disrupted, as a result of which the image of the observed object falls on noncorresponding (located at various distances from the macula lutea) points of the retinas of both eyes. In diplopia binocular vision is always disturbed. Diplopia disappears when one eye is closed. Rarely (for example, after trauma, when there is detachment of the root of the iris and two so-called pupils are formed, and when there is subluxation of the crystalline lens), monocular diplopia—when the same object yields two images in one eye—may occur. When the other eye is closed the doubling does not cease. Investigation of diplopia is valuable in identifying paralyses of the oculomotor muscles, which occur frequently even with some constitutional diseases (encephalitides and cerebral hemorrhages, for example).


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Thus, traction on the cranial nerves results in hyperacusis and dizziness (CN VIII), horizontal diplopia (CN VI) and facial numbness (CN V) or facial weakness (CN VII).
The patient's mother reported that her child complained of horizontal diplopia for approximately two months prior to visiting their optometrist.
A 78-year-old woman with a history of a remote right-sided cerebrovascular accident complained of painless, progressive onset of binocular horizontal diplopia, elicited by switching from near to distance vision.
Patients with bilateral sixth nerve palsies complain about binocular horizontal diplopia being worse in the gaze direction of the paretic lateral rectus muscle.
Internuclear ophthalmoplegia, resulting from an inflammatory demyelinating lesion in the medial longitudinal fasciculus, is characterised by impaired horizontal eye movement with a weak adduction deficit of the affected eye and an abduction nystagmus of the contralateral eye; this results in horizontal diplopia. Bilateral internuclear ophthalmoplegia is almost always caused by a demyelinating disorder.