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准分子激光屈光性角膜切削术可以成功地矫治近视及散光［１～３］。然而，这种技术并非无并发症，其中之一即准分子激光切除后角膜组织的愈合反应有时不可预测。这就可能导致包括屈光回退（ｒｅｇｒｅｓ－ｓｉｏｎ）、过矫及角膜上皮下雾状混浊（ｈａｚｅ）等并发症的发生［４?
Excimer laser refractive keratectomy can successfully correct myopia and astigmatism [1-3]. However, this technique is not without complications, one of which is the unpredictable healing of corneal tissue after excimer laser ablation. This can lead to complications including regres-sion, overcorrection and corneal haze [4?