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Abstract The earlier the treatment of IXT, the better the sensory outcome including binocular fusion and stereopsis. Unless there is definite evidence of existing defective binocular vision, surgery should be preceded by several months of observation since the disease does not progress in all patients. During this period over correcting minus lenses can be prescribed. Finally, over correcting minus lenses should be prescribed for IXT patients with the following criteria: High AC/A ratio Moderate to good control of exotropia, A temporizing measure for young patients waiting for surgery and sometimes for patients with undercorrection after surgery Overcorrection with minus lenses may improve the quality of fusion and occasionally may even decrease the angle of deviation so that surgery may be deferred. Glasses should be prescribed for IXT patients with the following criteria: Refractive error either astigmatism or myopia, Moderate to good control of exotropia, Small angle of deviation. Glasses may improve the quality of fusion and stereopsis. It occasionally may even decrease the angle of deviation. |