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首页> 外文期刊>Journal of Optometry >Multi-aspheric description of the myopic cornea after different refractive treatments and its correlation with corneal higher order aberrations
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Multi-aspheric description of the myopic cornea after different refractive treatments and its correlation with corneal higher order aberrations

机译：近视眼角膜在不同屈光度治疗后的多非球面描述及其与角膜高阶像差的关系

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Background: To analyse the asphericity of the anterior corneal surface (ACS) for different diameters, and correlate those values with corneal higher order aberrations (cHOA) before and after myopic treatments with corneal refractive therapy (CRT) for orthokeratology and customized (CL) and standard laser (SL) assisted in situ keratomileusis (LASIK). Setting: Clinica Oftalmologica NovoVision, Madrid, Spain. Methods: The right eyes of 81 patients (27 in each treatment group), with a mean age of 29.94+/-7.5 years, were analysed. Corneal videokeratographic data were used to obtain corneal asphericity (Q) for different corneal diameters from 3 to 8mm and cHOA root mean square (RMS) obtained from Zernike polynomials for a pupil diameter of 6mm. Results: There were statistically significant differences in asphericity values calculated at different corneal diameters for different refractive treatments and their changes. The difference between asphericity at 3 and 8mm reference diameters showed statistically significant correlations with spherical-like cHOA that was also significantly increased after all procedures. Conclusions: The shift in corneal asphericity and the differences among different treatment techniques are more evident for the smaller reference diameters. These differences can be much reduced or even masked for a peripheral reference point at 4mm from centre, which is used by some corneal topographers.
机译：背景：分析不同直径的角膜前表面（ACS）的非球面度，并将这些值与角膜屈光疗法（CRT）进行角膜塑形术和定制（CL）的近视治疗前后的角膜高阶像差（cHOA）相关联标准激光（SL）辅助原位角膜磨镶术（LASIK）。地点：西班牙马德里临床临床中心。方法：分析81例患者的右眼（每个治疗组27例），平均年龄为29.94 +/- 7.5岁。角膜角膜地形图数据用于获得3mm至8mm不同角膜直径的角膜非球面度（Q），以及从Zernike多项式获得的cHOA均方根（RMS）瞳孔直径为6mm。结果：对于不同的屈光治疗及其变化，在不同角膜直径下计算出的非球面度值存在统计学差异。在3mm和8mm参考直径处的非球面性差异显示出与球形cHOA的统计学显着相关性，在所有程序后该相关性也显着增加。结论：对于较小的参考直径，角膜非球面性的变化以及不同治疗技术之间的差异更加明显。这些差异可以大大减小，甚至对于距中心4mm的周围参考点也可以掩盖，某些角膜地形图师使用此参考点。

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