Aniseikonia is a binocular condition in which left and right images differ in size or shape. There are two types of aniseikonia – static and dynamic aniseikonia. The first type is the classical aniseikonia, denoting a perceived image size difference with a fixed gaze direction. Classic aniseikonia can occur naturally or be induced by refractive surgery.

The second type of aniseikonia is also called induced anisophoria and denotes a perceived image size difference due to unequal prism effects when looking through different parts of the two (anisometropic) spectacle lenses. Detailed Aniseikonia and Lasik Information