准分子激光屈光性角膜手术后角膜知觉的改变

目的观察和分析准分子激光屈光性角膜切削术（ｐｈｏｔｏｒｅｆｒａｃｔｉｖｅｋｅｒａｔｅｃｔｏｍｙ，ＰＲＫ）和准分子激光原位角膜磨镶术（ｌａｓｅｒｉｎ－ｓｉｔｕｋｅｒａｔｏｍｉｌｅｕｓｉｓ，ＬＡＳＩＫ）治疗近视后角膜知觉的变化。方法对２３１例（３８７只眼）近视患者施行ＰＲＫ，对４８２例（７９６只眼）施行ＬＡＳＩＫ进行治疗。对术后角膜知觉不同时期的变化进行检查、分析。结果ＰＲＫ和ＬＡＳＩＫ术后早期角膜知觉均明显下降，尤以ＰＲＫ明显。ＰＲＫ术后角膜知觉在术后６个月才能恢复，ＬＡＳＩＫ术后角膜知觉约在术后１个月即恢复。结论ＰＲＫ术后角膜知觉的恢复比ＬＡＳＩＫ慢。

Changes in corneal sensitivity after excimer laser corneal refractive surgeries

Objective To observe and compare the changes in corneal sensitivity after photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) for myopia. Methods PRK was performed on 387 eyes of 231 patients and LASIK was performed on 796 eyes of 482 patients with myopia. Corneal sensitivity was examined preoperatively and 1 week, 1, 3 and 6 months postoperatively. Results Corneal sensitivity was reduced at the early postoperative stage of both PRK and LASIK. The eyes after PRK showed greater reduction. Corneal sensitivity returned to the baseline levels at 6 months after PRK and 1 month after LASIK. Conclusion The recovery of corneal sensitivity after PRK is slower than that following LASIK.