Wei Rui Hua, Lim Li, Chan Wing Kwong, Tan Donald T H
Singapore National Eye Center, Singapore.
Ophthalmology. 2006 Feb;113(2):177-83. doi: 10.1016/j.ophtha.2005.11.004.
To evaluate Orbscan II (Bausch & Lomb, Orbtek Inc., Salt Lake City, UT) corneal topography in individuals with myopia.
Retrospective, observational, consecutive, clinical case series.
One hundred forty eyes of 70 persons with myopia.
Manifest refraction results and the Orbscan II corneal topographic maps were reviewed retrospectively.
Refractive powers and the following test indices produced by Orbscan II were analyzed: anterior elevation best-fit sphere (BFS), posterior elevation BFS, maximum posterior elevation (Max PE), radius of Max PE, maximum keratometry, minimum keratometry, astigmatism, 3-mm irregularity, 3-mm mean power, 3-mm astigmatism, 5-mm irregularity, 5-mm mean power, 5-mm astigmatism, corneal diameter, pupil diameter, thinnest pachymetry, and anterior chamber depth. The correlations between right eyes and left eyes and between indices were explored.
Of the 140 eyes, the mean manifest refraction was -5.27+/-2.19 diopters (D; range, -10.50 to 0.00 D), the mean Max PE was 28+/-7 mum, and the mean maximum keratometry was 44.5+/-1.5 D. Correlation coefficient analyses of Orbscan II quantitative indices combined with pattern recognition showed that there were high degrees of correlations between the right and left eyes of each individual patient. Maximum posterior elevation, corneal irregularity, and thinnest pachymetry did not vary with the degree of maximum keratometry.
This article provides a detailed description and analysis of Orbscan II corneal topography of a normal population with myopia. This helps in establishing normal standards in Orbscan II corneal topography that will aid in preoperative assessment in refractive surgery.
评估Orbscan II（博士伦公司，Orbtek公司，犹他州盐湖城）在近视患者中的角膜地形图。
回顾性、观察性、连续性临床病例系列。
70名近视患者的140只眼睛。
回顾性分析显验光结果和Orbscan II角膜地形图。
分析Orbscan II产生的屈光力和以下测试指标：前表面高度最佳拟合球面（BFS）、后表面高度BFS、最大后表面高度（Max PE）、Max PE半径、最大角膜曲率、最小角膜曲率、散光、3毫米不规则度、3毫米平均屈光力、3毫米散光、5毫米不规则度、5毫米平均屈光力、5毫米散光、角膜直径、瞳孔直径、最薄角膜厚度和前房深度。探讨右眼和左眼之间以及各指标之间的相关性。
在140只眼中，平均显验光为-5.27±2.19屈光度（D；范围，-10.50至0.00 D），平均Max PE为28±7μm，平均最大角膜曲率为44.5±1.5 D。Orbscan II定量指标与模式识别相结合的相关系数分析表明，每个患者的右眼和左眼之间存在高度相关性。最大后表面高度、角膜不规则度和最薄角膜厚度不随最大角膜曲率程度而变化。
本文详细描述和分析了正常近视人群的Orbscan II角膜地形图。这有助于建立Orbscan II角膜地形图的正常标准，以辅助屈光手术的术前评估。
