aniseikonia

aniseikonia /an·is·ei·ko·nia/ (an″is-i-ko´ne-ah) inequality of the retinal images of the two eyes.

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an·i·sei·ko·ni·a (n-s-kn-)

n.

A condition in which the shape and size of the ocular image differ in each eye.

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aniseikonia

[an′īsīkō′nē·ə]

Etymology: Gk, anisos, unequal, eikon, image

an abnormal ocular condition in which each eye perceives the same image as being of a different form and size.

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aniseikonia

retinal images in each eye are different sizes.

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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.