准分子激光屈光性角膜切削术的角膜地形图分析

Corneal topographic analysis of excimer laser photorefractice keratectomy in myopic eyes.

目的 了解准分子激光角膜切削术后角膜地形图的形态变化。方法 采用角膜地形图对 6 8例 (118眼 )术后进行检测分析。结果 角膜的切削形态在 1、3、6月中 ,均质型逐渐增加 ,半月形、钥匙孔型及中央岛型百分比逐渐减少 ,4种切削类型中 ,中央岛型对视力影响最大 ,偏中心距离越大 ,术后最佳矫正视力下降越明显。结论 角膜地形图是了解角膜屈光状态的一种有效的定量分析手段。

To evaluate the morphologic change of corneal toporaphy after PRK. Methods The postoperative corneal topography of 118 eyes of 68 cases were analized by using corneal topographic analytical system. Results The homogeneous corneal surface morphology following excimer laser ablation increased postoperatively in the 1 st month, 3 rd month and 6 th month while percentage of semilunar、 key-hole and central island ablating surface decreased gradually. The central island cerneal ablating surface had a great influence upon visual acuity. Postoperatively, its best corrected visual acuity doclined significantly with eccentricity. Conclusion Corneal topographic analytical system is a useful fool to evaluate the morphology of the corneal ablating surface.