The Effects of Fixation Device and Holder on Clinical Result of LASIK

Kim, Chul Woo; Kim, Eung Kweon; Joo, Choun Ki

Abstract

Many devices using in LASIK and PRK remake to minimize side effect. Fixation devices(EK-Fixation devices:Sejong Medical, Korea)and Holder(Global Fixation ring multiple teeth 13 mm diameter:Katena, USA; below holder)are made to minimize side effect called Ablation Decentration. Our study aims at evaulating the effect of using Fixation devices and Holder after LASIK. Corneal topography was used to anaylze centration in groups of patients:15 had LASIK using Fixation devices, 23 had LASIK using Holder, 20 had LASIK not using Fixation devices and Holder. Mean amount of decentration in topography of group of LASIK using Fixation devices was statistically significantly decreased in pre-operation(0.220+/-0.158)compared with 0.083+/-0.055 in post operation(P=0.017). In LASIK using Holder, mean amonut of decentration in topography in pre-operation(0.214 +/-0.124)was statistically significantly decreased compared with 0.146+/-0.071 in pre-peration, too(P=0.044). But mean amount of decentration in topography in LASIK not using Fixation devices and Holder, 0.156+/-0.100 in pre-operation was not statistically significantly different from 0.200+/-0.178 in post-operation. In LASIK groups using Fixation devices, mean amount of decentration in topography was significantly decreased comparing with other groups(P=0.010). And then, mean amount of decentration in topography from preoperative cornea center to postoperative cornea center using Fixation devices was 0.243+/-0.109, using Holder was 0.248+/-0.154 compared to control group(0.267+/-0.163). Groups using Fixation devices and Holder was significantly decreased comparing with other groups (P=0.010). In conclusion, Fixation devices and Holder are made to minimize side effect called Ablation Decentration in our study.