Department of Ophthalmology, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Department Ophthalmology, Uijeongbu St. Mary Hospital, College of Medicine, The Catholic University of Korea, Uijeongbu, Korea.
Sci Rep. 2020 Apr 15;10(1):6445. doi: 10.1038/s41598-020-63594-4.
The purpose of this study is to investigate the relationships between corneal asphericity and Haigis-L formula prediction errors in routine cataract surgery after refractive surgery for myopic correction. This retrospective study included 102 patients (102 eyes) with a history of previous PRK or LASIK and cataract surgery. Axial length, anterior chamber depth, and central corneal power were measured using the optical biometer. On the anterior corneal surface, Q-value, spherical aberration, and ecentricity at 6.0 and 8.0 mm were measured using a rotating Scheimpflug camera. The postoperative refractive outcome at 6 months, mean error, and mean absolute error were determined. Correlation tests were performed to determine the associations between pre-cataract surgery data and the prediction error. The Q-values for 6.0 and 8.0 mm corneal diameter were 1.57 ± 0.70 (range: 0.033.44), and 0.82 ± 0.5 (range: -0.10-2.66). The spherical aberration for 6.0 and 8.0 mm diameter was 1.16 ± 0.39 µm (range: 0.242.08 µm), and 3.69 ± 0.87 µm (range: 0.915.91 µm). eccentricity for 6.0 and 8.0 mm diameter was -1.22 ± 0.31 (range: -1.85 to -0.17), and -0.82 ± 0.39 (range: -1.63 to 0.32). The spherical aberration for 8.0 mm cornea diameter showed the highest correlations with the predicion error (r = 0.750; p < 0.001). When the modified Haigis-L formula considering spherical aberration for 8.0 mm produced smaller values in standard deviation of mean error (0.45D versus 0.68D), mean absolute error (0.35D versus 0.55D), and median absolute error (0.31D versus 0.51D) than the Haigis formula. Corneal asphericity influences the predictive accuracy of the Haigis-L formula. The accuracy was enhanced by taking into consideration the corneal spherical aberration for the 8.0 mm zone at pre-cataract surgery state.
本研究旨在探讨屈光手术后白内障手术中角膜非球面性与 Haigis-L 公式预测误差的关系。本回顾性研究纳入了 102 例（102 眼）既往行 PRK 或 LASIK 并接受白内障手术的患者。使用光学生物测量仪测量眼轴长度、前房深度和中央角膜曲率。在角膜前表面，使用旋转 Scheimpflug 相机测量 6.0 和 8.0mm 处的 Q 值、球差和偏心度。术后 6 个月时测量屈光结果，确定平均误差和平均绝对误差。进行相关检验以确定白内障术前数据与预测误差之间的相关性。6.0 和 8.0mm 角膜直径的 Q 值分别为 1.57±0.70（范围：0.033.44）和 0.82±0.5（范围：-0.10-2.66）。6.0 和 8.0mm 直径的球差分别为 1.16±0.39μm（范围：0.242.08μm）和 3.69±0.87μm（范围：0.915.91μm）。6.0 和 8.0mm 直径的偏心度分别为-1.22±0.31（范围：-1.85 至-0.17）和-0.82±0.39（范围：-1.63 至 0.32）。8.0mm 角膜直径的球差与预测误差相关性最高（r=0.750；p<0.001）。当考虑到 8.0mm 角膜的球差时，改良的 Haigis-L 公式产生的平均误差标准差（0.45D 对 0.68D）、平均绝对误差（0.35D 对 0.55D）和中位绝对误差（0.31D 对 0.51D）均小于 Haigis 公式。角膜非球面性影响 Haigis-L 公式的预测准确性。通过在白内障术前状态下考虑 8.0mm 区域的角膜球差，可以提高准确性。
