准分子激光原位角膜镶磨术术后角膜后表面曲率与视力的中远期观察

Observation of Cornea Posterior Surface Curvature and Naked Vision in Medium-and-Long Period after LASIK

目的:观察准分子激光原位角膜镶磨术(LASIK)术后角膜后表面曲率与视力的中远期状况,探讨术后角膜屈光状态的稳定性。方法:随机选择接受LASIK治疗近视的患者131例(247眼),分为A组(轻、中度近视)42例(75眼)、B组(高度近视)50例(94眼)、C组(超高度近视)39例(78眼)。观察各组在术前及术后6、12个月的角膜后表面曲率及裸眼视力状况。结果:A、B、C 3组术后6个月与本组术前比较,角膜后表面曲率明显增加、裸眼视力明显改善(P<0.05,P<0.01);C组术后12个月与术后6个月比较,角膜后表面曲率增加(P<0.05),裸眼视力减退(P<0.05),而A、B组上述指标在此阶段均无显著变化(P>0.05)。结论:超高度近视者在LASIK术后6～12个月(中远期)角膜前凸仍不同程度存在,视力可能有回退;轻、中度及高度近视者术后6个月角膜前凸基本稳定,视力稳定。

Objective：To investigate corneal dioptric stability in medium-and-long period after LASIK by observing cornea posterior surface curvature and naked vision . Methods： 131 patients （247 eyes）treated with LASIK were randomly selected and divided into group A （mild and moderate myopia,in 42 patients,75 eyes） ,group B （high myopia in 50 patients,94 eyes ）and group C （severe myopia in 39 patients ,78 eyes）. Cornea posterior surface curvature and naked vision in each group were observed 6 and 12 months before and after operation. Results：Cornea posterior surface curvature increased and naked vision in the three groups significantly improved （P 〈 0.05 ,P 〈 0. 01 ）, but cornea posterior surface in group C increased 12 months after operation when compared with that of 6 months after operation（P 〈0. 05）. but the naked vision decreased （ P 〈 0.05 ）. There was no obvious change in the above indexes in group A and B in the same period （ P 〉 0.05）. Conclusion：During postoperative 6-mon to 12-mon,cornea anterior protrusion instability and vision slip may still exist in severe myopia but not in mild and moderate myopia.