Analysis of Corneal Topographic Optical Zone and Decentration after Myopic Refractive Surgery

PURPOSE: To identify factors influencing the ablation center and to evaluate the size of ablation zone after PRK and LASIK using Technolas 217 C. METHODS: This study comprised 69 eyes ; PRK was done on 31 eyes and LASIK on 38 eyes. The ablation zone and the degree of decentration were determined through corneal topography. We divide the eyes with the degree of decentration. Lesser than 0.5mm were classified as the first group, from 0.5 to 1.0mm were classified as the second group. The ablation zone diameter in topography was compared with preoperative programmed optical zone. RESULTS: The only factor influencing ablation center in PRK group was preoperative spherical equivalent(p=0.016), while there was no factor influencing ablation zone in LASIK group. In PRK and LASIK group, the long axis of the ablation zone was longer than that of the programmed optical zone(p=0.003), while the short axis was shorter(p=0.001). CONCLUSIONS: After refractive surgery using Technolas 217 C Eximer laser with eye tracking system, there was no clinically significant decentration. The greater preoperative spherical equivalent, the more decentered ablation were noted in PRK group. The topographical long axis of ablation zone was longer than that of the programmed ablation zone, while the short axis of ablation zone was shorter. We should be aware of the possibility that the short axis of the postoperative ablation zone could be shorter than that of the programmed preoperative optical zone.

Author dc:creator

• 최, 중혁

Contributors dc:contributor

• 유, 호민
• 대학원 의학과
• 200324292

• 중심이탈
• 술 전 구면렌즈대응치
• 연마부의 크기
• Ablation center decentration
• Ablation zone diameter
• Spherical equivalent

Language dc:language

ko

Identifier

http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000000203
000000000203

OAI identifier oai:identifier

oai:repository.ajou.ac.kr:201003/2316