Background: Blepharoptosis surgery is a common oculoplastic procedure that aims at correcting ptosis to improve appearance, clear the visual axis to reduce amblyopia. Frontalis suspension is a standard procedure used in cases of poor levator function. Objectives: To compare anatomical and cosmetic outcomes in double triangle versus monotriangle upper eyelid frontalis fascia lata sling in cases of congenital ptosis with poor levator functions. Study design: Prospective comparative study conducted in Kasr El Aini Medical school and included 30 eyes of 20 patients suffering from congenital ptosis with poor levator function. Patients were allocated into two groups; Group A underwent fascia lata suspension using bitrangular configuration while group B underwent monotriangular configuration. Results: The sling configuration did not alter the surgical outcome with similar results and complications in both groups. However, in monotriangular method, the operation was shorter, easier with less sling material needed and fewer skin incisions produced.