Anisometropia is an imbalance in the prescription between one eye and the other. 

Most eyes will be slightly different, but when that difference is more pronounced it can lead to difficulties for spectacle wearers whose lenses magnify the images they produce on the retina by different amounts. The brain fuses the two retinal images together to form a single picture of the world. Whilst it can cope with small differences between the two images, when they become too great, the brain cannot fuse them together and the patient experiences double-vision. This spectacle magnification, as it is called, is caused by the fact that the spectacle lenses sit some distance from the eye. Contact lenses, which sit on the eye, minimise this effect and are the best remedy for this problem. Any type of lens will work.

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