Corneal Biomechanical Properties of Keratoconic Eyes Following Penetrating Keratoplasty

Abstract

Objectives: To investigate the corneal biomechanical properties of keratoconic eyes following penetrating keratoplasty (PKP).Materials and Methods: Thirty-five patients (70 eyes) were enrolled to this prospective study. Operated and contralateral keratoconiceyes were defined as Group 1 and 2, respectively. All patients underwent ophthalmological examination and measurements of cornealbiomechanical properties by Ocular Response Analyzer (ORA), intraocular pressure (IOP) by Goldmann applanation tonometry,and central corneal thickness (CCT) by Pentacam. Shapiro-Wilk W test was performed to test normality of the data. The statisticalsignificance was evaluated with the paired t-test and Wilcoxon signed ranks test. Pearson correlation and Spearman rho tests were usedfor correlation analysis.Results: The average age and male/female ratio were 31.34±11.65 (15-60) years and 21/14, respectively. The mean values of the dataobtained from Group 1 and 2 respectively were: corneal hysteresis (CH): 9.35±1.66, 8.18±1.84 mmHg (p=0.013), corneal resistancefactor (CRF): 9.48±1.96, 7.14±2.05 mmHg (p