眼科 ›› 2015, Vol. 24 ›› Issue (3): 164-166.doi: 10.13281/j.cnki.issn.1004-4469.2015.03.007

• 论著 • 上一篇    下一篇

VisxStarS4准分子激光机治疗近视眼实际切削深度与预计值差值的比较

齐颖 周跃华 张晶 张丽   

  1. 100730 首都医科大学附属北京同仁医院 北京同仁眼科中心 眼科学与视觉科学北京市重点实验室

  • 收稿日期:2014-09-24 出版日期:2015-05-25 发布日期:2015-06-04
  • 通讯作者: 周跃华,Email: yuehua0220@yahoo.com E-mail:yuehua0220@yahoo.com

Comparison of the difference between practical and predicted ablated depth in mypoia corrected by VisxStarS4 excimer laser

QI Ying, ZHOU Yue-hua, ZHANG Jing, ZHANG Li   

  1. Beijing Tongren Eye Center, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China

  • Received:2014-09-24 Online:2015-05-25 Published:2015-06-04
  • Contact: ZHOU Yue-hua, Email: yuehua0220@yahoo.com E-mail:yuehua0220@yahoo.com

摘要: 目的 通过VisxStarS4准分子激光机治疗不同屈光度近视角膜实际切削深度与机器预计值之间差值的比较,更好地预测术后角膜厚度。设计 回顾性病例系列。研究对象 北京同仁医院屈光中心治疗的近视患者共119例(234眼),按术前等效球镜屈光度将患眼分为低度近视(低于-3 D,63眼)、中度近视(-3~-6 D,93眼)和高度近视(高于-6 D,78眼)。方法 采用Zimmer飞秒激光制作角膜瓣,VisxStarS4准分子激光机切削角膜基质。术前和术后1周,采用相干光断层扫描(OCT)测量中央角膜厚度(CCT),计算实际切削深度,与激光机本身预计切削深度值相减得到差值,比较低度、中度和高度近视组的差值,以判断激光切削的精确性。主要指标 CCT值、实际切削深度与预计切削深度的差值。结果 低度、中度和高度近视三组术前CCT分别为(521.95±37.97) μm、(523.16±30.38) μm、(524.77±33.57) μm(F=0.125,P=0.882)。每组术前预计切削值分别为(41.83±8.53) μm、(69.15±12.72) μm、(96.23±11.46) μm,实际切削值分别为(46.13±9.78) μm、 (77.05±16.72) μm、 (107.78±14.27) μm),各组间预计切削与实际切削比较差异均有统计学意义(t=-2.63,-3.63,-5.57;P=0.01,< 0.001,< 0.001);三组实际切削深度与预计切削深度的差值分别为(6.40±4.44) μm、(8.89±6.84) μm、(11.81±8.72) μm(F=10.497,P<0.001),三组间差值的两两比较,差异均有统计学意义(P=0.030,0.007,<0.001)。结论 VisxStarS4准分子激光机治疗近视的实际切削深度比预计切削略深,对低、中度近视有较好的预测性。

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近视眼/外科学, 准分子激光原位角膜磨镶术, 飞秒激光, 切削深度

Abstract:  Objective To predict the residual corneal depth more accurately by comparing the difference between practical and predicted ablated depth in different mypoic diopter eyes corrected by VisxStarS4 excimer laser. Design Retrospective case series. Participants 119 cases (234 eyes) with myopia were corrected by VisxStarS4 excimer laser in Tongren Hospital. The patients were divided into group I (low myopia, >-3 D 63 eyes),group II (medium myopia, -3~-6 D 93 eyes) and group III(high myopia, <-6 D 78 eyes).Methods Corneal flap was made with Zimmer femtosecond laser. VisxStarS4 excimer laser ablated the corneal stroma. The central corneal thickness (CCT) was measured by optical coherence tomography (OCT) before operation and 1 week after operation, to obtain the difference values between practical ablation depth and the predicted ablation depth. Main Outcome Measures CCT, difference value between practical and predicted ablation depth. Results The average CCT before operation of the group I, II, and III groups was 521.95±37.97 μm, 523.16±30.38 μm, and 524.77 ± 33.57 μm respectively (F=0.125, P=0.882). The predicted ablation depth (41.83±8.53 μm, 69.15±12.72 μm, 96.23±11.46 μm) was significantly different from practical ablation depth (46.13±9.78 μm, 77.05±16.72 μm, 107.78±14.27 μm) in each group (t=-2.63, -3.63, -5.57; P=0.001, <0.001, <0.001, respectively. The average difference between practical and predicted ablated depth in three groups was 6.40±4.44 μm, 8.89±6.84 μm, 11.81 ± 8.72 μm, respectively (F=10.497, P<0.001). The average difference values was significant different from each other when compared between any two of the three groups (P=0.030, 0.007, 0.000, respectively). Conclusion VisxStarS4 excimer laser can accurately predict the corneal ablation depth particularly in low and moderate myopia. The practical ablated value is more than the predicted ablated value.

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myopia/surgery, laser in situ keratomileusis, femetosecond laser, ablation depth