Outcomes After Müller Muscle Conjunctival Resection Versus External Levator Advancement in Severe Involutional Blepharoptosis.

[PURPOSE] To compare outcomes between Müller muscle conjunctival resection (MMCR) ptosis repair and external levator resection (ELR) in patients with severe involutional blepharoptosis.

[DESIGN] Retrospective, interventional, comparative case series.

[METHODS] A retrospective review was performed of patients who underwent ptosis repair between 2012 and 2019. Inclusion criteria were patients who underwent MMCR or ELR ptosis repair, patients with complete documentation of preoperative eyelid measurements, and patients with documentation of postoperative outcome. The main outcome measure was surgical failure, defined as patient-reported or physician-reported dissatisfaction with postoperative eyelid height or postoperative upper margin reflex distance (MRD1) of less than 2 mm. Severe ptosis was described as an MRD1 of 0 or worse. Outcome analysis was also performed after stratification for concomitant blepharoplasty performed at the time of ptosis repair.

[RESULTS] A total of 231 patients (372 eyelids) met the study criteria, of which 142 eyelids had severe ptosis. Comparing outcomes of MMCR vs ELR in patients with severe ptosis, there was a statistically significant higher rate of success after MMCR (P = .0143). The rate of ptosis repair success in eyelids that underwent MMCR was 97.2% and 90.9% in patients with severe ptosis and mild/moderate ptosis, respectively (P = .42). In eyelids that underwent ELR, the rate of ptosis repair success was 77.4% and 85% in eyelids with severe ptosis and mild/moderate ptosis, respectively (P = .15). Concomitant blepharoplasty did not affect ptosis repair outcomes in any group.

[CONCLUSIONS] MMCR ptosis repair is an effective approach in treating patients with severe ptosis, and it may offer superior outcomes to ELR. In patients with good responses to phenylephrine, MMCR may offer an efficient and highly efficacious surgery regardless of presenting MRD1.