作者：宋冰冰,刘汉强
作者单位：1中国辽宁省沈阳市,中国医科大学附属第一医院眼科; 2中国辽宁省鞍山市中心医院眼科
【摘要】 目的：研究LASIK术矫治1.00D的等效球镜度数时角膜前表面屈光力发生的变化。
方法：以角膜地形图所测得的角膜前表面屈光力（K值）为标准，角膜前表面屈光力变化量ΔK= K术前K术后，按矫治等效球镜度数（SE矫治）将患者分成低、中度近视（SE矫治≤ 6.00D）及高度近视（SE矫治＞ 6.00D）两组，计算ΔK/SE矫治，并与由经验公式推导出的0.8进行统计学分析。
结果:当矫治1.00D的等效球镜度数时，总体研究对象:低、中度近视组和高度近视组的角膜前表面屈光力分别变化0.89±0.24D，0.94±0.28D和0.83±0.18D；切削的角膜组织分别为11.46±0.76μm，11.87±0.65μm和11.08±0.65μm；角膜的切削量与矫治等效球镜度数呈负相关关系。
结论：LASIK术后低、中度近视的角膜前表面屈光力变化大于高度近视。
【关键词】 LASIK;角膜前表面屈光力;矫治等效球镜度数
Relationship between the change of anterior corneal refractive power and spherical equivalent degree after LASIK
BingBing Song1,2, HanQiang Liu1
1 Department of Ophthalmology, the First Hospital of China Medical University, Shenyang 110001, Liaoning Province, China; 2 Department of Ophthalmology, Anshan Central Hospital, Anshan 114001, Liaoning Province, China
AbstractAIM: To evaluate the change of anterior corneal refractive power as spherical equivalent degree (SE) changes 1D in LASIK.
METHODS: Anterior corneal refractive power (K value) was measured by corneal topography. The change of anterior corneal refractive power ΔK=KpreKpost. The patients were divided into two groups based on SE: low to moderate myopia group (SE≤ 6.00D) and high myopia group (SE＞ 6.00D). We calculated ΔK/SE and analyzed the difference between it and 0.8 which was conducted from empirical formula.
RESULTS: When spherical equivalent degree changes 1.00D, the change of anterior corneal refractive power of all, low to moderate myopia and high myopia were 0.89±0.24D, 0.94±0.28D and 0.83±0.18D, respectively. The cut corneal tissue of two groups was 11.46±0.76μm, 11.87±0.65μm and 11.08±0.65μm. There was a negative correlation between the quality of cut corneal tissue and spherical equivalent degree.
CONCLUSION: The anterior corneal refractive power changes more in low to moderate myopia than that in high myopia after LASIK.
KEYWORDS: LASIK; anterior corneal refractive power; spherical equivalent degree
Song BB, Liu HQ. Relationship between the change of anterior corneal refractive power and spherical equivalent degree after LASIK.
Int J Ophthalmol(Guoji Yanke Zazhi)2008;8(11):22762277
0引言
LASIK作为一种安全、有效、预测性强的手术，其术后效果是患者和手术医生非常关心的问题。有研究表明，术后角膜曲率是影响视觉质量及屈光稳定性的重要因素[13]，因此客观准确的预测术后角膜屈光力，可为手术设计及预测术后效果提供重要参考。本研究探讨角膜前表面屈光力变化与矫治等效球镜度数的关系，结果报告如下。
1对象和方法
1.1对象 随机选择2005 06/200710于中国医科大学附属第一医院近视眼治疗中心LASIK术后超过2mo的患者52例104眼，其中男18例36眼，女34例68眼，年龄17～46（平均25.31±6.82）岁，术前等效球镜度数为1.25～15.00D(平均 6.62±2.59D),手术矫治等效球镜度数(SE矫治)为1.50～13.25D（平均 6.56±2.07D）,术后裸眼视力均≥1.0，无屈光回退。按SE矫治将患者分为低、中度近视（SE矫治≤ 6.00D）组25例50眼及高度近视组（SE矫治＞ 6.00D）27例54眼。所有患者手术前后均无角膜活动性炎症，无翼状胬肉，术前均无其他屈光手术史。
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