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Aponeurotic blepharoptosis may be safely and effectively corrected by resection of Müller΄s muscle. This surgery is thought to raise the upper lid by advancement of the levator muscle and aponeurosis. A particular feature of the technique is a consistently good postoperative eyelid contour, achieved through high placement of sutures on the tarsal plate. The open-sky technique offers advantages over other ptosis surgeries, including direct visualization of Müller΄s muscle, opportunity for adjustment of lid height, the potential for preservation of conjunctival tissue, and efficacy in patients who do not demonstrate a positive phenylephrine test. [ABSTRACT FROM AUTHOR]