A standard 3-port pars plana vitrectomy was performed by a single surgeon using 23-gauge vitrectomy system, with a 1-step scleral tunnel incision. After posterior vitreous detachment was achieved, peeling of the ILM was performed by an end gripping forceps with the assistance of indocyanine green dye. The ILM was peeled in round shape with the radius of either 0.75-disc diameter or 1.5-disc diameter centering at the center of the MH according to the pre-assigned group. This was followed by a complete fluid-gas exchange, and all patients were encouraged to maintain a face-down position for at least 5 days postoperatively.