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Corneal Topographical Changes After Müller's Muscle-conjunctival Resection Surgery.

PURPOSE
To evaluate corneal refractive and topographical changes after Müller's muscle conjunctival resection surgery on patients with mild ptosis.


METHODS
A total of 28 eyes of 28 patients with mild ptosis underwent Müller's muscle conjunctival resection. Visual acuity, margin reflex distance, and cycloplegic refraction were analyzed preoperatively and at first, third, and sixth months postoperatively. Change in corneal topography was analyzed with Sirius System using parameters including corneal astigmatism (CYL), average simulated keratometry value (simK), apical keratometry front (AKf), symmetry index front (SIf), and central corneal thickness (CCT) at the same intervals.


RESULTS
Best-corrected visual acuity and cycloplegic refraction did not change significantly at all controls postoperatively. The mean change in corneal astigmatism, simK, SIf, and CCT did not show significant differences. Apical keratometry front showed a significant decrease at 3 and 6 months.


CONCLUSION
The pressure of upper eyelid in patients with ptosis appeared to have resulted in steepening of the superior cornea along this axis. The surgical correction of ptosis induces flattening of superior cornea as shown by significant decrease in apical keratometry front value postoperatively and restores corneal topography to a more regular state.