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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 It might be outdated or ideologically biased.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 ?
And this is a logic applying not only endlessly to the self's relation to and (diplopic) perception of the other, but also to the self's living and relating to/of its others: "Ego est toujours en meme temps un alter, un moi qui y pense." Just as diplo-pia - taken physiologically and in the full range of its metaphoricity - splits and divides, it also permits the creation of new perspectives, new images, new networks of relatable experience and articulation thereof.
The whitish, cloudy, endless wall is the breast or the ghost of a breast--thus sensed by the diplopic amblyopic baby, with its weak powers of accommodation and its confused depth and color perceptions.
Visual symptoms manifest in difficulties of distinguishing clearly the image, perception of color breakdown, diplopic, vertigo, disturbance of assessing spatial relationships.