Touzeau O, Borderie V, Chastang P, Scheer S, Allouch C, Laroche L
Service d'Ophtalmologie, Hôpital Saint-Antoine, Paris.
J Fr Ophtalmol. 1999 Nov;22(9):936-42.
To compare the accuracy and reproducibility of the Eye Sys videokeratoscope algorithms for analyzing idiopathic and surgery-induced astigmatism analysis.
Refractive astigmatism, videokeratoscopy (axial, tangential and refractive power), autorefractometry, autokeratometry, and keratometry were recorded in 20 patients with idiopathic astigmatism, 40 patients who had undergone cataract surgery and 40 patients who had undergone penetrating keratoplasty. For each eye, 2 successive videokeratoscopy were recorded.
Both cylinder and axis provided by the tangential algorithm are significantly less reproducible than the cylinder and axis provided by the axial and refractive algorithms (P < 0.001). Cylinders provided by the axial and refractive algorithms showed a stronger correlation with subjective cylinder (rs > 0.89; p < 0.001) than the cylinder provided by the tangential algorithm (rs = 0.66; p < 0.001). Both keratometric axis and autokeratometric axis showed the strongest correlation with subjective axis (rs > 0.92; p < 0.001). The accuracy and reproducibility were higher for the topographic "bow tie" patterns than for the other topographic patterns.
The axial and refractive algorithms of the Eye Sys videokeratoscope are more accurate and reproducible than the tangential algorithm for analyzing idiopathic or surgery-induced astigmatism.
比较Eye Sys角膜地形图仪算法在分析特发性散光和手术引起的散光方面的准确性和可重复性。
记录了20例特发性散光患者、40例接受白内障手术的患者和40例接受穿透性角膜移植术的患者的屈光性散光、角膜地形图（轴向、切向和屈光力）、自动验光、自动角膜曲率测量和角膜曲率测量结果。对每只眼睛记录了连续2次角膜地形图检查结果。
切向算法提供的柱镜度数和轴位的可重复性明显低于轴向和屈光算法提供的柱镜度数和轴位（P < 0.001）。轴向和屈光算法提供的柱镜度数与主观柱镜度数的相关性（rs > 0.89；p < 0.001）比切向算法提供的柱镜度数（rs = 0.66；p < 0.001）更强。角膜曲率轴位和自动角膜曲率测量轴位与主观轴位的相关性最强（rs > 0.92；p < 0.001）。地形学上的“领结样”模式比其他地形学模式的准确性和可重复性更高。
在分析特发性或手术引起的散光方面，Eye Sys角膜地形图仪的轴向和屈光算法比切向算法更准确且可重复性更好。
