Background Congenital ptosis is a drooping of one or both eyelids at birth, o en due to poor development of the levator palpebrae superioris muscle. This can result in amblyopia, astigmatism, and ocular torticollis and therefore may necessitate surgical intervention in early childhood if visual development is compromised. Patients may have varied levels of levator function. Those with moderate to good function may elect to first attempt ptosis repair with external levator advancement or mullerectomy/Fasanella-Servat procedures. For those with poor function, those procedures are less likely to be e ective, so they may undergo frontalis sling surgery, in which the tarsal plate is coupled to the frontalis muscle, so that movement of the brow and forehead result in movement of the eyelid. The optimal material to use in this surgery is unknown. Objectives To evaluate the comparative e ectiveness and safety of various materials used in frontalis sling surgery for congenital ptosis. Search methods We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (which contains the Cochrane Eyes and Vision Trials Register)