CORNEAL TOPOGRAPHIC CHANGES AFTER EYELID PTOSIS SURGERIES MEASURED BY CORNEAL TOPOGRAPHY

Abstract

Background: The cornea is a complex structure which has a protective role, and responsible for about three-quarters of the optical power of the eye. Pressure from the eyelids has been implicated in a range of short- and long-term corneal topographical changes. Objective: To evaluate corneal topographic changes after eyelid ptosis surgeries measured by corneal topography by the Sirius system (CSO, Florence, Italy). Patients and Methods: A total of 50 eyes of patients were enrolled in the study to be examined before and 6 weeks after ptosis surgeries using corneal topography device at Al-Azhar University Hospitals in the period extending from December 2018 to December 2019. A complete ophthalmological examination included uncorrected visual acuity, best corrected visual acuity, full slit lamp examination and evaluation of eyelid. Examination was done by the Sirius system to evaluate corneal topographic changes. Results: Apical keratometry front (AKF) was changed from (44.63 ± 1.34D) to (44.06 ± 1.47D) with statistically significant (P value=0.002). Changes in central corneal thickness (CCT), corneal astigmatism (CYL), average simulated keratometry (average K), and symmetry index front (SIF) obtained from Sirius were not statistically significant. Conclusion: The pressure of upper eyelid in patients with ptosis appeared to inducing steepening of the superior cornea along this axis. The surgical correction of ptosis induces flattening of superior cornea as shown by significant decrease in AKF value postoperatively restoring corneal topography to a more regular state.