Aniseikonia

With aniseikonia ( altgr. of aniso, equal to ' and eikon, image ') refers to a difference in size of the two images that are projected in vision on the retina of the right and left eye. In contrast, a Resolution equality is called Iseikonie.

Different image sizes arise firstly by lateral differences in appearance ( anisometropia ). We call this condition as a dioptric aniseikonia. Secondly, it can be an expression of a so-called functional aniseikonia caused by different distribution of sensory elements in the retina and visual cortex. A physiological aniseikonia is triggered by an object is fixed laterally from both eyes, the object close eye has a larger retinal image when the object distance.

Since must be made ​​to coincide in vision to achieve a spatial ( stereoscopic ) visual impression both retinal images, pronounced Aniseikonien lead to disturbances of binocular vision with appropriate complaints that can not be compensated for by means of sensory fusion.