Department of Ophthalmology, King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia. E-mail.
Saudi Med J. 2020 Feb;41(2):168-176. doi: 10.15537/smj.2020.2.24876.
To report the corneal elevation and thickness values for Saudi myopes and to evaluate the differences between these parameters in subgroups of this target population. Methods: Pentacam corneal topographic maps of the right eyes of patients visiting Al-Hokama Eye Clinic, Riyadh, Saudi Arabia, a tertiary eye center between January 2009 and December 2015 were retrospectively analyzed in this cross-sectional study. The patients were grouped into 3 categories based on their spherical readings: mild (-0.25 to -2.75D), moderate (-3.00 to -5.75D), and severe (≥-6.00D). Furthermore, patients with cylindrical readings of ≥-1.00 diopter were categorized as having myopic astigmatism, whereas those with less than -1.00 cylindrical diopter were categorized as having simple myopia. Results: Our sample was comprised of 1,276 patients; 838 (65.7%) had simple myopia and 438 (34.3%) had myopic astigmatism. The values for the whole myopic group were as follows: anterior corneal elevation (AE) at the apex= 2.60±1.48 (standard deviation), thinnest AE= 2.56±1.68, posterior elevation (PE) at the apex= 3.67±3.58, thinnest PE= 4.92±3.81, central pachymetry= 550.09±34.29, apical pachymetry=550.73±34.64, and thinnest pachymetry= 546.30±34.61. All of the measurements, except the apical PE and thinnest PE, were statistically significant across the simple and myopic astigmatism groups (p less than 0.05). Comparing the mild to moderate myopia groups revealed a significant difference in the apical AE (p=0.037). Moreover, the comparison between the mild and severe myopia groups revealed that the apical PE and the thinnest PE, as well as the central, apical, and thinnest pachymetry values were statistically significantly different (p less than 0.05). Conclusion: The corneal elevation indices and thicknesses specific to the Saudi myopes were found to be comparable to the international databases in terms of the elevation and thickness in some of the parameters.
报告沙特近视者的角膜隆起和厚度值，并评估这些参数在该目标人群亚组中的差异。方法：回顾性分析 2009 年 1 月至 2015 年 12 月期间在沙特阿拉伯利雅得的 Al-Hokama 眼科诊所就诊的右眼 Pentacam 角膜地形图。根据球镜读数，将患者分为 3 组：轻度（-0.25 至-2.75D）、中度（-3.00 至-5.75D）和重度（≥-6.00D）。此外，将圆柱镜读数≥-1.00 屈光度的患者归类为近视散光，而圆柱镜读数小于-1.00 屈光度的患者归类为单纯近视。结果：我们的样本包括 1276 名患者；838 名（65.7%）患有单纯性近视，438 名（34.3%）患有近视散光。整个近视组的数值如下：顶点前角膜隆起（AE）=2.60±1.48（标准差），最薄 AE=2.56±1.68，顶点后隆起（PE）=3.67±3.58，最薄 PE=4.92±3.81，中央角膜厚度=550.09±34.29，顶点角膜厚度=550.73±34.64，最薄角膜厚度=546.30±34.61。除顶点 PE 和最薄 PE 外，所有测量值在单纯性和近视散光组之间均有统计学意义（p<0.05）。比较轻度至中度近视组，发现顶点 AE 有显著差异（p=0.037）。此外，轻度和重度近视组之间的比较表明，顶点 PE 和最薄 PE 以及中央、顶点和最薄角膜厚度值有统计学意义上的差异（p<0.05）。结论：与国际数据库相比，沙特近视者的角膜隆起指数和厚度在某些参数方面具有可比性。
