Investigation Of Surgically Induced Astigmatism Of Femtosecond Laser-assisted Phacoemulsification Cataract Surgery Using 2.2mm Clear Corneal Incision

Objective:To evaluate the surgicallyinduced astigmatism(SIA)using femtosecond laser-assisted phacoemulsification cataract surgery with 2.2 mm clear corneal incision.Methods:A prospective,comparative analysis was performed in case series.A total of 105 eyes of 84 patients(No.1 cataract department of Shanxi Eye Hospital)underwent femtosecond laser-assisted phacoemulsification cataract surgery between March 2014 and April 2016 were enrolled for this study.The main outcomes were the surgically induced astigmatism(SIA),distant visual acuity,spherical refractive power preoperative and 1,3,and 6 months postoperatively.The distant visual acuity were recorded as log MAR.Based on follow-up time(1,3,6 months postoperatively),lens nucleus hardness(grade Ⅱ,Ⅲ,Ⅳ),corneal astigmatism types(with the rule,against the rule,oblique)and laterality(left,right),SIA were analyzed using Alphins vector analysis.Results:The mean preoperative log MAR visual acuity was 0.65±0.24,which is significantly different from postoperative log MAR visual acuity at 1 month(0.07±0.02),3 month(0.06±0.01),and 6 month(0.06±0.01).No significant log MAR visual acuity difference exsits among the three postoperative follow-up times.According to follow-up time(1,3,6months postoperatively),lens nucleus hardness(grade Ⅱ,Ⅲ,Ⅳ),corneal astigmatism types(with the rule,against the rule,oblique)and laterality(left,right),no statistical SIA difference was found between every two postoperative follow-up time.Conclusion:Femtosecond laser-assisted phacoemulsification cataract surgery using 2.2 mm clear corneal incision can provide stable SIA and better postoperative log MAR visual acuity.