The term diplopia comes from the Greek words diploös (double) and opsis (seeing). It translates as double vision. The ensuing coexistence ofsim-ilar images within the field of vision is called * multiplication. Diplopia can be divided into two broad classes: binocular diplopia, in which both eyes are involved, and *monocular diplopia in which only one eye is involved. When the term diplopia is used, it usually refers to binocular diplopia. For an account of monocular diplopia, see the entry Diplopia monocularis. Binocular diplopia is characterized by the visual perception of two identical images of a single object or stimulus, while looking with both eyes. The perceived image may display a horizontal, vertical, or oblique displacement, depending on the ocular muscles involved. Pathophysiologically, binocular diplopia is associated with a variety of conditions affecting the oculomotor nerve, the abducens nerve, the trochlear nerve, the eye muscles themselves, or the orbit (as in mass lesions). Etiologically, diplopia is associated with a variety of systemic conditions, including diabetes mellitus, hypertension, myasthenia gravis, herpes zoster, and aneurysm of the arteria communi-cans posterior. The local mechanical causes of diplopia binocularis include thyroid disease, orbit myositis, fracturing of the orbit wall, intraorbital tumour or haematoma, and Brown syndrome. Central causes of diplopia binocularis include mesencephalic lesions, pons lesions, increased intracranial pressure, and acute vitamin B1 deficiency (i.e. Wernicke's syndrome). Diplopia may be transferred to the content of * visual hallucinations, which then take the form of double images (also referred to as distorted hallucinations). The Scottish physicist David Brewster (1781-1868) is commonly credited with having been the first to demonstrate the mediation of distorted hallucinations experimentally. Whilst seeking to distinguish between sensory and hallucinatory visual images, he applied pressure to the eyeball of a test person, only to find that both types of percepts were doubled in the process. The term * pseudodiplopia is sometimes used to denote cases of *palinopsia, a condition which displays certain phenomenological similarities to diplopia.
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   Pelak, V.S. (2004). Evaluation of diplopia: An anatomic and systematic approach. Hospital Physician, 16-25.

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  • Diplopia — Di*plo pi*a, Diplopy Dip lo*py, n. [NL. diplopia, from Gr. ? double + the root of ? sight: cf. F. diplopie.] (Med.) The act or state of seeing double. [1913 Webster] Note: In crossed or heteronymous diplopia the image seen by the right eye is… …   The Collaborative International Dictionary of English

  • diplopia — s. f. Duplicação mórbida da imagem dos objetos na visão. = DIPLOPSIA …   Dicionário da Língua Portuguesa

  • diplopía — (Del gr. διπλόος, doble, y ὄψ, ὀπός, vista). f. Med. Fenómeno morboso que consiste en ver dobles los objetos …   Diccionario de la lengua española

  • diplopia — [dip lō′pē ə] n. [ModL < Gr diploos, double + ōps (gen. ōpos); akin to ops, EYE] a vision disorder in which a single object appears double; double vision diplopic [dipläp′ik] adj …   English World dictionary

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  • Diplopía — (Del gr. diploos, doble + ops, opos, vista.) ► sustantivo femenino MEDICINA Enfermedad ocular que consiste en ver dobles los objetos, provocada con frecuencia por una anomalía de los músculos del ojo. SINÓNIMO [visión doble] * * * diplopía (del… …   Enciclopedia Universal

  • diplopía — Eng. Diplopia Percepción de dos imágenes de un solo objeto. Vista doble. Visus duplicatus. Poliopía binocular. Diploscopia. Visión doble. Ambiopía …   Diccionario de oftalmología

  • diplopia — ż I, DCMs. diplopiapii, blm med. «widzenie podwójne, wywołane niesprawnością mięśni zewnętrznych gałki ocznej lub pasmowatym zmętnieniem soczewki» Diplopia jednooczna, obuoczna. ‹z gr.› …   Słownik języka polskiego

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