 Botulinum toxin has also been used postoperatively for improving the alignment in patients with over- or undercorrection after strabismus surgery, leading to rapid elimination of postoperative diplopia but possibly requiring repeated injections or reoperation later on.It is considered particularly useful for patients who have the potential for binocular vision; success rates are higher for treating postoperative esotropia than for treating postoperative exotropia.It has also been employed in combination with strabismus surgery in cases in which there is a large horizontal eye deviation and eye muscle surgery on "both" eyes (binocular surgery) is not an option for other reasons.