 Many different materials can be used for the surgery, though it is currently unclear which material has the highest success rate.The Levator Resection and Advancement surgery should only be considered for patients who are experiencing a levator function less than or equal to 5 mm.The levator function is a measurement of the distance that the eyelid travels starting with the downgaze moving to the upgaze without moving the frontalis muscle.Although this procedure can be completed through two different approaches, the internal and the external, the external approach allows the surgeons to obtain a better view of the surgical site during the procedure.