Aims: We aimed to define the effects of blepharostat time and phacoemulsification parameters on the function of the upper eyelid elevators.Methods: This prospective, longitudinal study analyzed the eyes of patients who underwent uncomplicated phacoemulsification with intraocular lens implantation surgery. Margin reflex distance, palpebral fissure height, and the functions of the levator palpebrae superioris (LPS) and Müller's muscle were measured on the day before surgery, at one and six months postsurgery. Intraoperatively, blepharostat time, phaco time, and phaco power were recorded. The change in the preoperative and postoperative LPS and Müller's muscle functions was also estimated. Results: We included 64 eyes from 64 patients. Postoperative first- and sixth-month Müller's muscle function were significantly lower than preoperative values (p=0.011 and p=0.015, respectively). The decreases in postoperative first- and sixth-month Müller's muscle functions were related to the blepharostat time (Spearman’s rho: 0.357, p=0.021; Spearman’s rho: 0.292, p=0.042). Phaco time and power did not correlate with decreases in Müller's muscle function. No patient had a ptosis finding. Conclusion: Müller's muscle function decreased after uncomplicated phacoemulsification with intraocular lens implantation surgery and persisted throughout the six-month follow-up. Blepharostat time was identified as an associated factor for this decline.
Karabulut et al. (Tue,) studied this question.