DIOPTER REGRESSION ANALYSIS OF LASER IN SITU KERATOMILEUSIS IN THE TREATMENT OF MYOPIA

摘要

Objective:To evaluate the relevant factors of regression phenomenon of laser in situ kerato-mileusis(LASIK)for treatment of myopia.Methods:We studied 408 eyes of 250 myopic patients who re-ceived LASIK.Patients were divided into 2 groups according to preoperative diopters(-6.00D--10.00D,194eyes;-10.10D--15.00D,214eyes).Mean period of follow-up were 12 months and the results were statisti-cally analyzed.Results:12 months after surgery,in the first group(-6.00D--10.00D)the regression equal to or beyond-1.0Dwere 21 eyes(10.8%),range from -1.0Dto -3.0D.The average regression was -1.33D.In the second group(-10.10D--15.00D) regression equal to or beyond-1.0Dwere 78 eyes (36.5%),range from -1.0D to -5.50D.The average regression was -1.99D--15.00D effectively with minimal re-gression within 12 months.Preoperative thin corneas with intraoperative small ablation zone could induce re-gression.Some modification of the surgical algorithms and laser nomogram will help to improve predictability and reduce regression.