Change of corneal biomechanical properties caused by phacoemulsification using corneal visualization Scheimpflug technology / 中华实验眼科杂志

ABSTRACT

Objective To explore the corneal biomechanical characteristics change in cataractous eyes before and after phacoemulsification using corneal visualization Scheimpflug technology (Corvis ST) and evaluate the influence of 3 mm clear corneal incision on corneal biomechanics.Methods A self-control study was performed.Thirty-six eyes of 36 patients who received phacoemulsification were enrolled in Tianjin Eye Hospital from March to May 2015.The first/second applanation time,the first/second applanation length,the first/second applanation velocity,the highest concavity time,the highest concavity radius,peak distance (PD),deformation amplitude (DA),intraocular pressure,corrected intraocular pressure and central corneal thickness(CCT) were measured in preoperation,postoperative 1 week and postoperative 1 month.This study protocal was approved by Ethic Committee of Tianjin Eye Hospital,and written informed consent was obtained from each patient prior to any medical examination.Results The first/second applanation length,intraocular pressure,corrected intraocular pressure,PD,DA and CCT were significantly different among preoperation,postoperative 1 week and postoperative 1 month (F =3.42,5.24,4.21,3.82,3.91,4.03,3.62;all at P＜0.05).Compared with the preoperative parameters,the first applanation length value was increased,and the second applanation length was reduced;the intraocular pressure and corrected intraocular pressure were elevated,and PD and DA values were increased,and the CCT was thicked in 1 week postoperative,with significant differences between the two time points (all at P＜0.05).Compared with the postoperative 1 week,the first applanation length value was reduced,and the second applanation length value was increased;the intraocular pressure and corrected intraocular pressure were lowed,and PD and DA values were smaller,and the CCT was thinner in postoperative 1 month,showing significant differences between the two time points (all at P ＜ 0.05).The first applanation length,the second applanation length,the intraocular pressure,corrected intraocular pressure,PD,DA and CCT in postoperative 1 month returned to the preoperative levels (all at P ＞ 0.05).Conclusions Corneal biomechanical properties occur change in the early stage after phacoemulsification and return to normal in postoperative 1 month.