aniseikonia

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aniseikonia

 [an″is-i-ko´ne-ah]
inequality of the retinal images of the two eyes.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

an·is·ei·ko·ni·a

(an'ĭ-sī-kō'nē-ă),
An ocular condition in which the image of an object in one eye differs in size or shape from the image of the same object in the other eye.
[G. anisos, unequal, + eikōn, an image]
Farlex Partner Medical Dictionary © Farlex 2012

aniseikonia

(ăn-ī′sī-kō′nē-ə)
n.
A condition in which the shape and size of the ocular image differ in each eye.

an·i′sei·kon′ic (-kŏn′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

an·is·ei·ko·ni·a

(an'ī-sī-kō'nē-ă)
An ocular condition in which the image of an object in one eye differs in size or shape from the image of the same object in the fellow eye.
[G. anisos, unequal, + eikōn, an image]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

aniseikonia

An ocular defect in which the size or shape of the retinal images are different in the two eyes. This is often the result of ANISOMETROPIA. From the Greek an , not iso , equal and eicon , an image.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

aniseikonia 

A difference in size and/or shape of the visual images of the two eyes. This may be due either to unequal axial lengths of the two eyes, to an unequal distribution of the retinal elements or an inequality of the cortical representation of the two ocular images (basic or intrinsic aniseikonia). It is most frequently induced by lenses of different power used in the correction of anisometropia (refractive aniseikonia). Symptoms include visual discomfort, visual distortion of space and sometimes difficulty in achieving binocular vision, as for example in spectacle corrected unilateral aphakia. Aniseikonia is measured with an eikonometer, although a simple test consists of separating the retinal images of a large target (e.g. a test chart) with prisms and comparing them: placing size lenses in front of one eye until the images appear equal will give an indication of the amount of aniseikonia. See aniseikonic lens; shape magnification; New Aniseikonia test; Turville infinity balance test.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann