Iseikonic lenses are custom-designed spectacle lenses that alter the magnification in one or both eyes by changing several lens parameters: front curvature, center thickness, vertex distance, and/or lens material. The perceptual disturbance caused by the image size difference between the two eyes are relieved by either magnification of the eye seeing through the smaller image or mignification of the eye seeing through the larger image.
Contact lenses may be helpful in certain subtypes of aniseikonia, especially if the image size difference is induced by a difference in the front curvature of the cornea.
Vision therapy is the training of the visual system to become effective and comfortable in handling visual stress of the environment. It is especially helpful in cases of aniseikonia that have associated binocular dysfunction (eye-teaming problems) and/or accommodative dysfunctions (eye-focusing problems).
Aniseikonia is a binocular phenomenon. In other words, it exists only when both eyes are viewing. When one eye is partially or fully occluded with a specially-prescribed occluder contact lens or eye-patch, the symptoms due to aniseikonia is expected to be eliminated.
Monovision correction, either in the form of spectacles or contact lens, consists of correction of one eye for distance and the other for near-viewing.
The final effect will be similar to a partial occlusion described above.
