Takehara Atsuko, Maeda Naoyuki, Ninomiya Sayuri, Fujikado Takashi, Hiroha Yoko, Mihashi Toshifumi
Department of Ophthalmology, Osaka University Medical School, Suita, Osaka, Japan.
Department of Applied Visual Science, Osaka University Medical School, Suita, Osaka, Japan.
Jpn J Ophthalmol. 2006 Jul-Aug;50(4):318-322. doi: 10.1007/s10384-005-0340-7.
To determine the effects of the reference axes used during the measurements of ocular and corneal higher-order aberrations (HOAs) in patients before and after laser in situ keratomileusis (LASIK).
Wavefront sensing and corneal topography were determined for 29 eyes of 15 patients before and after LASIK. Ocular and corneal HOAs were calculated for 4-mm- and 6-mm-diameter pupils with the instrument aligned with the line of sight (LOS) or with the vertex normal (VN).
For ocular HOAs after surgery, the spherical-like aberration was significantly larger when the VN axis rather than the LOS axis was used for pupils of both diameters. For corneal HOAs before surgery, in addition to the larger spherical-like aberration for VN, coma-like aberrations were significantly larger with LOS than with VN for both pupil diameters. For corneal HOAs after surgery, the spherical-like aberrations and total HOAs for 4-mm-diameter pupils with VN were significantly larger than those with LOS.
The HOAs were significantly different depending on the axes used and should be described on the basis of a common axis. These results suggest that the anterior surface of the normal or post-LASIK cornea is more rotationally symmetrical along the VN than along the LOS.
确定在准分子原位角膜磨镶术（LASIK）前后患者眼部和角膜高阶像差（HOA）测量过程中所使用的参考轴的影响。
对15例患者的29只眼在LASIK手术前后进行波前传感和角膜地形图检查。使用仪器与视线（LOS）或顶点法线（VN）对齐，计算直径为4毫米和6毫米瞳孔的眼部和角膜HOA。
对于术后眼部HOA，当使用VN轴而非LOS轴时，两种直径瞳孔的类球面像差均显著更大。对于术前角膜HOA，除了VN的类球面像差更大外，两种瞳孔直径下，LOS的类彗差均显著大于VN。对于术后角膜HOA，直径4毫米瞳孔的VN类球面像差和总HOA均显著大于LOS。
HOA因所使用的轴不同而有显著差异，应以共同轴为基础进行描述。这些结果表明，正常或LASIK术后角膜的前表面沿VN比沿LOS更具旋转对称性。
