The Clinic Study Of Excimer Laser Corneal Refractive Surgery For Presbyopes

Section1An initial observation of multifocal LASIK to correct presbyopia1、Objectives:To observe efficacy and safety of multifocal LASIK for presbyopia.2、Methods:The myopia group included26eyes of13patients, baseline mean spherical equivalent refraction was-1.75～-7.75(-4.69±2.07) D, near addition was+0.75-+2.75(+1.88～0.51) D. The hyperopia group included16eyes of8patients, baseline mean spherical equivalent refraction was+1.25-+3.25(+2.08±0.71) D, near addition was+1.25～+2.5(+2.06±0.41) D. Multifocal LASIK was performed on all eyes using a Nidek EC-5000CⅫ excimer laser. Pseudo-accommodative cornea (PAC) software was used to calculate the multistep ablation profile.3、Results:6～12months after surgery, in the myopia group, postoperative mean spherical equivalent refraction was-1.75～+0.5(-0.56±0.64) D, with57.7%eyes within±0.50D,69%eyes achieved uncorrected distance visual acuity (UDVA) of0.8or better and85%achieved0.5or better,42%eyes achieved uncorrected near visual acuity (UNVA) of0.8or better and100%achieved0.5or better. In the hyperopia group, postoperative mean spherical equivalent refraction was-1.25-+0.5(-0.47±0.61) D, with56.3%eyes within±0.50D,56%eyes achieved uncorrected distance visual acuity (UDVA) of0.8or better and100%achieved0.5or better,19%eyes achieved uncorrected near visual acuity (UNVA) of0.8or better and81%achieved0.5or better,1eye lost1line of BSCVA. There were no serious complications after surgery.4、Conclusion:Multifocal LASIK for presbyopia using the Nidek EC-5000CⅫexcimer laser and PAC software was safe and effective. Section2Mini-monovision Peripheral PresbyLASIK for Presbyopic Myopes1、Objectives:To evaluate the outcomes of mini-monovision peripheral presbyLASIK in presbyopic myopes.2、Methods:Twenty-eight subjects (56eyes) were included in this prospective study. The mean age of the cohort was51years (range,45years to62years). Mean spherical equivalent refraction (SE) of the dominant eyes was-7.00±2.04D (range,-11.00D to-4.00D), and-7.11±1.99D (range,-11.13D to-4.25D) for non-dominant eyes. Mini-monovision peripheral presbyLASIK was performed with the dominant eye corrected for distance vision and the non-dominant eye for near vision using the NIDEK EC-5000CⅫ excimer laser. The target refraction was-0.25D for the dominant eyes and-0.75D for the non-dominant eyes. Data are reported for the last postoperative visit (6months or later).3、Results:The mean postoperative SE was-0.58±0.45D (range,-1.38D to+0.50D), with71%within±0.50D of the intended SE for the dominant eyes. In the non-dominant eyes, Mean postoperative SE was-1.00±0.44D (range,-1.75D to OD), with71%within±0.50D of the intended SE. All subjects achieved binocular uncorrected distance visual acuity (UDVA) of0.8or better,82%achieved binocular uncorrected near visual acuity (UNVA) of0.8or better and93%achieved0.5or better. No eyes lost more than one line of BCVA, and there were no serious complications after surgery.4、Conclusion:Mini-monovision peripheral presbyLASIK was safe, effective and highly predictable for myopic presbyopes.