The Changes Of Corneal Configuration After Phacoemulsification

Objective:To evaluate changes of corneal configuration after phacoemulsification with different corneal incisions through using anterior segment optical coherence tomography(AS-OCT)and Pentacam Scheimp imaging systemMethods:76 patients(eyes)diagnosed with age-related cataract in the ophthalmology clinic of Yanbian University Affiliated Hospital from May 2017 to July 2017 were divided into 2 groups:2.2 mm clear corneal incision group(n=37)and 1.8 mm clear corneal incision group(n=39).Phacoemulsification and intraocular lens implantation were performed in all cases.Patients were examined before surgery and 1 day,1 week and 1 month after surgery.The corneal incision structure and corneal thickness were measured by AS-OCT.The corneal volume in the central corneal diameters of 3.0 mm and 10.0 mm was measured using a Pentacam.Results:1.There were no significant differences in age,gender,preoperative intraocular pressure,and nuclear hardness between the two groups.2.There was no significant difference in corneal endothelial cell counts between the two groups before surgery and 1 month after surgery.(P=0.515,P=0.195)3.The central corneal thickness increased significantly on the first day after operation,and the central corneal thickness gradually recovered over time.The central corneal thickness was not statistically significant between preoperarion and 1 month after operation.(P>0.05)4.0n the first day after operation,the incidence of incision and endothelial dislocation in the 1.8 mm group was higher than that in the 2.2 mm group,and these gradually recovered over time.5.Corneal volume at 3.0 mm(CV3)was significantly increased on the first day after surgery in both groups,and there was a statistically significant difference compared with preoperative(2.2 mm group:P=0.001;1.8 mm group:P=0.002),CV3 was higher in the 1.8 mm group than in the 2.2 mm group on the first day after surgery,but there was no significant difference(P=0.094).The CV3 gradually returned to the preoperative level over time,and the two groups were no significant difference in CV3 one month after operation(P=0.701)..The thickness of the posterior corneal incision and corneal volume at 10.0 mm(CV10)was significantly higher than that on the first day after surgery.The differences between the two groups disappeared over timeConclusion:1.The incidence of elastic layer detachment and endothelial dislocation of 1.8 mm incision group after phacoemulsification was relatively higher.2.The corneal edema in the 1,8 mm group was significantly higher than that in the 2.2 mm group on the first day after surgery.3.The corneal morphology and postoperative corneal damage were more clearly observed using AS-OCT,and the Pentacam system contribute to the assessment and quantification of corneal edema.