Havlíková I, Kvasnicka J, Rozsíval P, Peregrin J, Lorencová V
Ocní klinika FN, Hradec Králové.
Cesk Slov Oftalmol. 2003 Jun;59(3):188-95.
Fourier analysis is a powerful method of evaluating the surface of the cornea. In 50 patients after photorefractive keratectomy included in our study we measured spherical equivalent, regular astigmatism, irregular astigmatism and decentration retrospectively acquired by Fourier series analysis of corneal topography data 1, 3, 6 and 12 months after operation. Postoperative decentration increased significantly from a mean preoperative value. The preoperative and postoperative values are not significantly different. The Fourier spherical equivalent and the values of keratometric spherical (equivalent) are highly correlated. Correlation among decentration, irregular astigmatism and best corrected visual acuity is important for clinical practice. Due to Fourier analysis we obtain information, which could explain worse results of some surgeries.
傅里叶分析是评估角膜表面的一种强大方法。在我们研究纳入的50例接受准分子激光原位角膜磨镶术（PRK）的患者中，我们通过对术后1、3、6和12个月的角膜地形图数据进行傅里叶级数分析，回顾性测量了等效球镜度、规则散光、不规则散光和偏心度。术后偏心度较术前平均水平显著增加。术前和术后值无显著差异。傅里叶等效球镜度与角膜曲率计测量的球镜（等效）值高度相关。偏心度、不规则散光与最佳矫正视力之间的相关性对临床实践很重要。通过傅里叶分析，我们获得了一些信息，这些信息可以解释某些手术效果较差的原因。
