Authors: Xu Lingxiao, Wei Yinjuan, Song Hui
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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.
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.
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).
Corneal biomechanical properties occur change in the early stage after phacoemulsification and return to normal in postoperative 1 month .