Bandlitz Stefan, Bäumer Joachim, Conrad Uwe, Wolffsohn James
Höhere Fachschule für Augenoptik Köln (Cologne School of Optometry), Cologne, Germany; Ophthalmic Research Group, Life and Health Sciences, Aston University, Birmingham, UK.
Höhere Fachschule für Augenoptik Köln (Cologne School of Optometry), Cologne, Germany.
Cont Lens Anterior Eye. 2017 Aug;40(4):242-247. doi: 10.1016/j.clae.2017.04.006. Epub 2017 May 8.
A detailed evaluation of the corneo-scleral-profile (CSP) is of particular relevance in soft and scleral lenses fitting. The aim of this study was to use optical coherence tomography (OCT) to analyse the profile of the limbal sclera and to evaluate the relationship between central corneal radii, corneal eccentricity and scleral radii.
Using OCT (Optos OCT/SLO; Dunfermline, Scotland, UK) the limbal scleral radii (SR) of 30 subjects (11M, 19F; mean age 23.8±2.0SD years) were measured in eight meridians 45° apart. Central corneal radii (CR) and corneal eccentricity (CE) were evaluated using the Oculus Keratograph 4 (Oculus, Wetzlar, Germany). Differences between SR in the meridians and the associations between SR and corneal topography were assessed.
Median SR measured along 45° (58.0; interquartile range, 46.8-84.8mm) was significantly (p<0.001) flatter than along 0° (30.7; 24.5-44.3mm), 135° (28.4; 24.9-30.9mm), 180° (23.40; 21.3-25.4mm), 225° (25.8; 22.4-32.4mm), 270° (28.8; 25.3-33.1mm), 315° (30.0; 25.0-36.9mm), and 90° (37.1; 29.1-43.4mm). In addition, the nasal SR along 0° were significant flatter than the temporal SR along 180° (p<0.001). Central corneal radius in the flat meridian (7.83±0.26mm) and in the steep meridian (7.65±0.26mm) did not correlate with SR (p=0.186 to 0.998). There was no statistically significant correlation between corneal eccentricity and scleral radii in each meridian (p=0.422).
With the OCT device used in this study it was possible to measure scleral radii in eight different meridians. Scleral radii are independent of corneal topography and may provide additional data useful in fitting soft and scleral contact lenses.
在软性和巩膜接触镜验配中，详细评估角膜 - 巩膜轮廓（CSP）具有特别重要的意义。本研究的目的是使用光学相干断层扫描（OCT）分析角膜缘巩膜的轮廓，并评估中央角膜半径、角膜偏心度和巩膜半径之间的关系。
使用OCT（Optos OCT/SLO；英国苏格兰邓弗姆林）在30名受试者（11名男性，19名女性；平均年龄23.8±2.0标准差岁）中，于相隔45°的八个子午线上测量角膜缘巩膜半径（SR）。使用Oculus Keratograph 4（德国韦茨拉尔的Oculus）评估中央角膜半径（CR）和角膜偏心度（CE）。评估子午线上SR的差异以及SR与角膜地形图之间的关联。
沿45°测量的SR中位数（58.0；四分位间距，46.8 - 84.8mm）明显（p<0.001）比沿0°（30.7；24.5 - 44.3mm）、135°（28.4；24.9 - 30.9mm）、180°（23.40；21.3 - 25.4mm）、225°（25.8；22.4 - 32.4mm）、270°（28.8；25.3 - 33.1mm）、315°（30.0；25.0 - 36.9mm）和90°（37.1；29.1 - 43.4mm）测量的更平坦。此外，沿0°的鼻侧SR明显比沿180°的颞侧SR更平坦（p<0.001）。平坦子午线（7.83±0.26mm）和陡峭子午线（7.65±0.26mm）的中央角膜半径与SR均无相关性（p = 0.186至0.998）。各子午线的角膜偏心度与巩膜半径之间无统计学显著相关性（p = 0.422）。
使用本研究中所用的OCT设备，可以在八个不同子午线上测量巩膜半径。巩膜半径与角膜地形图无关，可能为软性和巩膜接触镜验配提供有用的额外数据。
