Diplopia

: The condition whereby a single object appears as two objects. Also called "double vision."

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The condition in which a single object is perceived as two objects. SYN: double vision. [diplo- + G. ops, eye]

- crossed d. d. in which the image seen by the right eye is to the left of the image seen by the left eye. SYN: heteronymous d..

- heteronymous d. SYN: crossed d..

- homonymous d. SYN: homonymous images, under image.

- monocular d. a double image or an extra ghost image produced in one eye, almost always by an aberration of the ocular media; for example, a corneal or lenticular irregularity, an uncorrected astigmatism or an irregularity of the vitreous or the retina. If a similar process occurs in both eyes (bilateral monocular d.), that is, the doubling is still present with either eye covered, the patient may still only see two images; seeing multiple images (polyopia) is rare.

- simple d. SYN: homonymous images, under image.

- uncrossed d. SYN: homonymous images, under image.

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dip·lo·pia dip-'lō-pē-ə n a disorder of vision in which two images of a single object are seen (as from unequal action of the eye muscles) called also double vision

dip·lo·pic -'lō-pik, -'läp-ik adj

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n.

double vision: the simultaneous awareness of two images of the one object. It is usually due to limitation of movement of one eye so that the two eyes cannot simultaneously look at the same object. This may be caused by a defect of the nerves or muscles controlling eye movement or a mechanical restriction of eyeball movement in the orbit. Double vision that does not disappear on covering one eye can be caused by early cataract (see also polyopia).

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di·plo·pia (dĭ-ploґpe-ə) [diplo- + -opia] the perception of two images of a single object; called also ambiopia, double vision, and binocular polyopia.