Fig. 6. The two halves of the muscle are separated into a Y configuration and reattached to the sclera. A. The inferior edge of the upper arm of the Y should be attached at the superior border of the original muscle insertion, and the superior edge of the inferior half of the muscle should be attached at the inferior border of the previous muscle insertion. B. If a recession is combined with the Y-splitting procedure, then these insertion points are relocated the desired amount posterior to the superior and inferior poles of the original insertion.