Long-term safety of laser in situ keratomileusis in eyes with thin corneas： 5-year follow-up  

作　　者：Yao-Wen Song Rui He Jack X.Ma Douglas D.Koch Li Wang 

机构地区：[1]Beijing Tongren Eye Center, Beijing Tongren Hospital,Capital Medical University, Beijing Ophthalmology and VisualScience Key Laboratory, Beijing 100730, China [2]Shanxi Eye Hospital, Taiyuan 030002, Shanxi Province,China [3]Mc Govern Medical School, University of Texas Health Science Center at Houston, TX 75835, USA [4]Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, TX 75844, USA

出　　处：《International Journal of Ophthalmology(English edition)》2018年第7期1227-1233,共7页国际眼科杂志（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(No.11402161);the Programs for Science and Technique Development of Shanxi Province,China(No.20120313025-3);the Science and Technology Research Projects of the Shanxi Provincial Health Department,China(No.201201018);an unrestricted grant from Research to Prevent Blindness,New York,NY,USA

摘　　要：AIM： To investigate the long term（≥5 y） efficacy, predictability, and safety of laser in situ keratomileusis（LASIK） in eyes with thin corneas [central corneal thickness（CCT） 〈500 μm]. METHODS： A total of 339 patients met the criteria of this study. Finally, 175 eyes of 89 patients who had thin corneas and underwent LASIK≥5 y ago returned to our clinic and included in this study. Preoperative parameters recorded included uncorrected visual acuity（UCVA）, corrected distance visual acuity（CDVA）, manifest refraction, CCT and corneal topography. At returning visits, in addition to visual acuity and manifest refraction, ultrasound CCT and corneal topography were performed. Optical coherence tomography was used to measure the CCT, LASIK flap thickness, and residual stromal bed thickness（RSBT）. Safety index, efficacy index, percentage of eyes within ±0.5 D and ±1.0 D of refraction, percent tissue altered（PTA）, and percentage stromal bed thickness（PSBT） were calculated. RESULTS： The safety index was 1.09 and efficacy index was 0.99. The percentages of eyes within ±0.5 D and ±1.0 D were 71.2% and 87.7%, respectively. The mean PTA was 40%±6%（range 20% to 55%）; 76 eyes（43.4%） had PTA 〈40% and 99 eyes（56.6%） had PTA≥40%. The mean RSBT was 303±27 μm（range 240 to 390 μm）, and 2 eyes had RSBT〈250 μm. The mean PSBT was 61%±9%（range 51% to 85%）. No eyes developed ectasia. CONCLUSION： In this cohort with the PSBT of 50% or more, LASIK is safe with follow-up for at least 5 y.AIM： To investigate the long term（≥5 y） efficacy, predictability, and safety of laser in situ keratomileusis（LASIK） in eyes with thin corneas [central corneal thickness（CCT） 〈500 μm]. METHODS： A total of 339 patients met the criteria of this study. Finally, 175 eyes of 89 patients who had thin corneas and underwent LASIK≥5 y ago returned to our clinic and included in this study. Preoperative parameters recorded included uncorrected visual acuity（UCVA）, corrected distance visual acuity（CDVA）, manifest refraction, CCT and corneal topography. At returning visits, in addition to visual acuity and manifest refraction, ultrasound CCT and corneal topography were performed. Optical coherence tomography was used to measure the CCT, LASIK flap thickness, and residual stromal bed thickness（RSBT）. Safety index, efficacy index, percentage of eyes within ±0.5 D and ±1.0 D of refraction, percent tissue altered（PTA）, and percentage stromal bed thickness（PSBT） were calculated. RESULTS： The safety index was 1.09 and efficacy index was 0.99. The percentages of eyes within ±0.5 D and ±1.0 D were 71.2% and 87.7%, respectively. The mean PTA was 40%±6%（range 20% to 55%）; 76 eyes（43.4%） had PTA 〈40% and 99 eyes（56.6%） had PTA≥40%. The mean RSBT was 303±27 μm（range 240 to 390 μm）, and 2 eyes had RSBT〈250 μm. The mean PSBT was 61%±9%（range 51% to 85%）. No eyes developed ectasia. CONCLUSION： In this cohort with the PSBT of 50% or more, LASIK is safe with follow-up for at least 5 y.

关 键 词：LASIK thin cornea long-term safety percent tissue altered percentage stromal bed thickness 

分 类 号：R77[医药卫生—眼科]