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[[Image:Stereogram_Tut_Eye_Convergence.png|thumb|120px|The two eyes converge to point to the same object]]
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When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. To look at an object closer by, the eyes rotate 'towards each other' ([[Convergence (eye)|convergence]]), while for an object farther away they rotate 'away from each other' ([[divergence (eye)|divergence]]). Exaggerated convergence is called ''cross eyed viewing'' (focussing on the nose for example) <!--, while exaggerated divergence is called [[?]] (which is a rare ability in humans-->. When looking into the distance, or when 'staring into nothingness', the eyes neither converge nor diverge.
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