Changes of corneal biomechanical properties and central thickness after segment sclearal buckling surgery

Objective To investigate the characteristics of corneal biomechanical properties and central thickness changes after segment sclearal buckling surgery.Methods Prospectively selected 31 eyes of 31 patients diagnosed as rhegrnatogenous retinal detachment undergoing segment sclearal buckling surgery,26 normal eyes of 26 volunteers as control group.Corneal biomechanical properties,including cornea hysteresis (CH) and comea resistance factor (CRF),were measured by the Ocular Response Analyser (ORA) before and lweek,1 month,and 3 months postoperatively.Intraocular pressure (IOPg) and corneal compensated IOP (IOPcc) were also measured by the ORA,and the cornea central thickness was obtained via ultrasound pachymetry and GAT using Goldman topometry.Results There was no significant difference between the control and study group in biomechanical properties and cornea central thickness before surgery (P ＞0.05).CH of study group decreased from 10.48±1.17mmHg to 8.34±l.58mmHg,(P ＜0.005),increased to 9.28±0.97mmHg (P ＜0.05) 1 month and recovered to 10.12±0.77mmHg,(P =0.372) 3 months postoperatively.CCT increased from 544.74± 29.02μm to 561.52±34.01μm,(P ＜0.05) 1 week,decreased to 532.23±30.33μm,(P ＜0.05) 1 month,536.55 ± 29.03 μm 3 months postoperatively,(P ＜0.05),still less than preoperatively.CRF decreased from 9.40±1.47 mmHg to 8.77±1.51 mmHg (P--0.012),but recovered to normal 1 month postoperatively.Conclusions CH appears to decrease first and increase to normal after surgery,comea central thickness increase after surgery but decrease later,still less than preoperative until 3 months. Key words: Segment sclearal bucking;  Cornea central thickness;  Corneal biomechanical properties;  Ocular Response Analysis