Comparative Study Of Ultra-thin Flap LASIK And LASEK For The Treatment Of High Myopia With Relative Thin Cornea

Objective To compare the subjective symptom,curative effect,efficacy,safety, and the change of corneal topography and wavefront aberration of the ultra-thin flap LASIK using Moria-M2-90-mikrokeratome and LASEK for the treatment of high mypia with relative thin corneal.Methods 100 eyes of 50 cases with high mypia with relative thin cornea were divided into two groups. 50 eyes of 25 cases received ultra-thin flap LASIK were included in group A. 50 eyes of 25 cases received LASEK were included in group B. The mean preoperative spherical equivalent was -7.18D(range from -6.00～-10.0D) and -7.15D(range from -6.00～-10.0D) respectively. The subject symptom,degree of satisfaction,uncorrected visual acuity, best corrected visual acuity, spherical equ ivalent , intraocular pressure ,complications ,the change of corneal topography and wavefront aberration were observed and compared during after surgery.Results The average flap thickness was 96.76士5.54um.Postoperative visual acuity of group A recovered faster with less steroid use than of group B.The degree of satisfaction of guoup A is bettet than group B. There were no threatening complications for vision in both group.The main complications were haze and regression in group B. Postoperative reaction was mild in group A patients, who showed a quick recovery in UCVA. There were no threatening complications for vision during surgery. The major complications of group B are haze and refrective rollback. The values of the intraocular pressure and the descent of BCVA none showed statistic significant difference .The corneal topographies were mainly smooth figure after 6 months Postoperatively.The SimK value difference and SimK equivalent value at 1 week Postoperatively showed statistic significant difference compared with preoperation,but none showed statistic significant difference compared with each postoperative period.The value of SRI and SAI are none showed statistic significant difference compared with preoperative and each postoperative period.RMS of each and total high order aberration in group A and group B were all increased at 1 week after operation. RMS of each and total high order aberration in group B was increased at 1 week after operation than group A ,and 3,5,6,7 order showed statistic significant difference . At 1,3,6,12 months postoperatively, RMS of each and total high order aberration in group B was decreased than group A , but no showed statistic significant difference.Conclusion Ultra-thincorneal flaps LASIK using Moria-M2-90-mikrokeratome none showed apparent difference compared with LASEK at the safety,the corneal topography and wavefront aberration. Ultra-thin corneal flaps LASIK is better than LASEK at stablitily, the speed of recovery and degree of comfort. Moria-M2-90-mikrokeratome can be used in a wilder region,it is the best selection for doctor.