Comparison of curative effects between first time iris recognition guided LASIK and traditional LASIK for myopic astigmatism

Abstract

Objective To compare the clinical effects between first time iris recognition guided LASIK and traditional LASIK for myopic astigmatism.Methods In this prospective contrast study,209 patients (391 eyes) with myopic astigmatism were randomly divided into two groups:the experimental group (105 cases,196 eyes) accepted first time iris recognize-guided LASIK,and the control group (104 cases,195 eyes) accepted traditional LASIK.The naked visual acuity,the best-corrected visual acuity,the degree and axis of astigmatism were compared between two groups at postoperative 1 month,3 months and 6 months.Results In experimental group,static iris recognition detected that eye cyclotorsional misalignment was 2.74°±2.05°,dynamic iris recognition detected that the intraoperative cyclotorsional misalignment range was 0-6.5°.At 6 months postoperative,uncorrected visual acuity of two groups was 0.5 or better in 100％.No eye lost ≥ 1 line of best spectacle-corrected visual acuity.Six months after operation,the naked vision of 181 eyes (92.3％) in experimental group and 167 eyes (85.6％) surpassed the preoperative best-corrected visual acuity of each group (P ＜0.01); the degree of astigmatism in experimental group (-0.22±0.20)D was significantly lower than that in the control group (-0.34±0.35)D (P ＜0.05).In experimental group,79 eyes became non-astigmatism 6 months after and in control group 55 eyes.Oblique astigmatism increased from 16 to 25 eyes.Conclusions The first time iris recognition can compensate deviation from eye cyclotorsion,and more precise treatment for the degree and axis of astigmatism in LASIK. Key words: Iris recognition; Astigmatism; Eye cyclotorsion; Keratomileusis, Laser in situ