准分子激光术后近视回退和欠矫原因分析

目的：探讨准分子激光近视治疗术后屈光回退和欠矫的原因，为临床提供理论依据。方法：将我院近视中心准分子激光术后发生屈光回退并行二次手术的45例70眼，按〈-6．00D为Ⅰ组，〉-6．00D度为Ⅱ组，将两组患者两次治疗前后屈光度、术后不同时间的视力、术式、切削光斑直径、角膜切削量及残留厚度等相关资料进行了对比分析。结果：两组未手术时屈光度差别显著（P〈0．05）。屈光回退后两组屈光度差别无意义（P〉0．05）。Ⅰ，Ⅱ两组首次激光术后6mo内，不同时间点裸眼视力与术前矫正视力有明显差别（P〈0．05）。二次手术后，1wk内裸眼视力与矫正视力差别明显（P〈0．05），1～3mo无差别（P〉0．05）；Ⅰ组于6mo时裸眼视力与矫正视力出现差别（P〈0．05），Ⅱ组差别不显著（P〉0．05）；两组激光切削光斑的直径及角膜切削量有明显差别（P〈0．05）。结论：准分子激光近视治疗术后，屈光度回退程度与术前屈光状态无关。不同屈光度屈光回退程度相同。高度近视、LASIK多区切削和切削光斑直径小是发生屈光回退和欠矫的主要原因。

Analysis on the causes of myopia regression after laser surgery

AIM: To analyze the causes of regression after excimer laser photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK).METHODS: Forty cases (70 eyes) were retreated for the regression after PRK and LASIK. They were divided into 2 groups by their myopia diopter. The data on the patients and the operation at the first and second surgeries were recorded and compared statistically.RESULTS: The naked eye's visual acuities in the 2 groups were not significantly different after myopia regression (P>0.05). There were differences in the primary diopters and the ablation bed's sizes at the first treatment (P<0.01).CONCLUSION: There is no relationship between the regression diopter and original myopia diopier. The main causes may be high myopia, LASIK's multi-beds ablation and size of ablation.