The treatment of ocular motility disorders, which occur in paralytic strabismus, presents a therapeutic challenge. The goal of treatment is to create an area of single binocular vision that is centered around the primary-gaze position. Careful analysis of the ocular motility deficit is crucial in selecting the appropriate surgical procedure. Paralytic strabismus is difficult to treat because of the incomitance of the deviation depending on the direction of gaze, respectively an increase of the deviation in the gaze with limited motility. Moreover, the possibility that horizontal and vertical components may be present, like in third nerve palsies, is another obstacle. Finally, in patients with long-stand paralysis, the ocular motility defect may have a restrictive component due to contracture of the antagonist muscle. Recognition of this phenomenon is important because any planned surgical procedure must deal with the induced restriction.
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