All patients were examined preoperatively by the same physician who performed the surgery. We reviewed medical records and collected demographic data, such as age and sex, as well as examination findings and measurements, including preoperative margin reflex distance, levator function, lagophthalmos, and visual field testing results. Intraoperative data, such as operative time and complications, as well as postoperative information, including postoperative margin reflex distance, levator function, contour, symmetry, lagophthalmos, need for revision, and length of follow-up, were also collected. In patients with unilateral ptosis, preoperative assessment of the patient's dominant eye and determination of whether there was any alteration in the height of the contralateral eyelid with elevation of the affected eyelid was performed. These factors were used to evaluate the risk of postoperative contralateral ptosis. Photographs were obtained preoperatively and postoperatively (Figure 1). On the basis of the consensus of prior literature, satisfactory postoperative symmetry was defined as a difference in margin reflex distance–1 (MRD-1) of 1 mm or less compared with the other eye1,3- 8 and an MRD-1 of at least 2 mm.9,10 A paired t test was used to determine the statistical significance of the change in eyelid height postoperatively. For patients who underwent bilateral surgery, a masked observer used a coin-flip to randomly select whether the data from the right eye or left eye would be included in order to have only independent observations as opposed to 2 sets of data for some patients and 1 set of data for others. A 2-tailed t test for independent samples (unpaired) was used to evaluate the difference between time and outcomes in unilateral and bilateral procedures. For the time calculation, the average time was used for bilateral procedures in order to have 1 time measurement per patient.