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准分子激光角膜切削术前后的角膜地形图分析
引用本文:张绥中,王长刚.准分子激光角膜切削术前后的角膜地形图分析[J].中华眼科杂志,1997,33(1):19-21.
作者姓名:张绥中  王长刚
作者单位:天津环湖医院眼科
摘    要:了解准分子激光角膜切削术(photorefractivekeratectomy,PRK)前、后角膜表面形态变化并对切削区偏中心进行分析。方法应用计算机辅助的角膜地形图仪对80例(122只眼)PRK前、后角膜地形图进行检测和分析。结果术前角膜地形图的形态呈对称或非对称性蝴蝶结形者占75.4%;术后圆形或近似圆形者占63.9%。切削区偏离瞳孔中心的距离与术前屈光度无关。切削区偏中心距离越大,术后角膜散光增加及术后最佳矫正视力下降越明显。结论PRK前、后角膜地形图检查和分析能清楚地显示角膜表面形态变化及定量评估切削区偏中心问题。

关 键 词:近视,角膜地形图,准分子激光

Corneal topography analysis before and after photorefractive keratectomy]
S Zhang,C Wang,H Yang.Corneal topography analysis before and after photorefractive keratectomy][J].Chinese Journal of Ophthalmology,1997,33(1):19-21.
Authors:S Zhang  C Wang  H Yang
Institution:Department of Ophthalmology, Huanhu Hospital, Tianjin.
Abstract:OBJECTIVE: To study the change of corneal surface morphology before and after photorefractive keratectomy (PRK) and analyze the decentralization of the ablation. METHODS: Corneal topography was examined on 122 eyes of 80 cases with myopia by computer-assisted photokeratography before and after PRK. RESULTS: Before PRK, the corneal topography of most examined eyes (75.4%) was symmetric bow tie pattern or asymmetric bow tie pattern; after PRK, the corneal topography of the ablated regions was mainly round or approximately round (63.9%). There is no relationship between the distance of decentralization of the ablation site and preoperative refractive diopters. But the more is the distance of decentralization, the more is the increase of postoperative corneal astigmatism and also the more is the decrease of the best corrected visual acuity. CONCLUSION: Examination and analysis on the corneal topography before and after PRK can clearly display the changes of the corneal surface morphology, and also can quantitatively evaluate the decentralization.
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