Jabbarvand Mahmoud, Askarizadeh Farshad, Sedaghat Mohamad Reza, Ghadimi Hadi, Khosravi Bahram, Amiri Mohammad Aghazadeh, Narooie-Noori Foroozan
Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.
J Ophthalmic Vis Res. 2017 Oct-Dec;12(4):374-379. doi: 10.4103/jovr.jovr_47_17.
The aim of this study was to determine the agreement between Pentacam HR (Scheimpflug imaging, Oculus) and Orbscan II (scanning slit topography, Bausch and Lomb) in measuring corneal parameters after photorefractive keratectomy (PRK) for hyperopia.
In this prospective cross-sectional study, 38 hyperopic eyes undergoing PRK were examined before refractive surgery and 8 to 10 months postoperatively using Pentacam HR and Orbscan II. Ultrasound (US) pachymetry was also used to measure central corneal thickness (CCT). The radius of anterior (A-) and posterior (P-) best-fit sphere size (BFS), central elevation (CE), and anterior maximum tangential power in 3 mm (TG3) and 3-5 mm (TG5) zones, anterior chamber depth (ACD), and central corneal thickness (CCT) were collected and used in the analyses. To study the agreement between the measurements made by the two devices, the method described by Bland and Altman was used and the 95% limits of agreement were calculated.
The 95% limits of agreement show reasonable agreement between the measurements by Pentacam HR and Orbscan II for A-BFS, P-BFS, A-TG3, and CCT, but not for A-CE, P-CE, A-TG5, or ACD. CCT values obtained by both Pentacam HR and Orbscan II correlated well with the values determined by US pachymetry.
Pentacam HR and Orbscan II after PRK for hyperopia show reasonable agreement for determining A-BFS, P-BFS, A-TG3, and CCT, but not for A-CE, P-CE, A-TG5, or ACD. CCT measurements with Pentacam HR have reasonable agreement with US pachymetry.
本研究旨在确定Pentacam HR（眼前节分析系统，Oculus公司）与Orbscan II（扫描裂隙角膜地形图仪，博士伦公司）在测量远视性准分子激光原位角膜磨镶术（PRK）后角膜参数方面的一致性。
在这项前瞻性横断面研究中，对38只接受PRK的远视眼在屈光手术前以及术后8至10个月使用Pentacam HR和Orbscan II进行检查。还使用超声（US）测厚法测量中央角膜厚度（CCT）。收集前（A-）和后（P-）最佳拟合球面尺寸（BFS）半径、中央高度（CE）、3mm（TG3）和3 - 5mm（TG5）区域的前表面最大切线屈光度、前房深度（ACD）以及中央角膜厚度（CCT）并用于分析。为研究两种设备测量结果之间的一致性，采用Bland和Altman描述的方法并计算95%一致性界限。
95%一致性界限显示，Pentacam HR和Orbscan II在测量A - BFS、P - BFS、A - TG3和CCT方面具有合理的一致性，但在测量A - CE、P - CE、A - TG5或ACD方面则不然。Pentacam HR和Orbscan II获得的CCT值与US测厚法确定的值相关性良好。
远视性PRK术后，Pentacam HR和Orbscan II在确定A - BFS、P - BFS、A - TG3和CCT方面显示出合理的一致性，但在A - CE、P - CE、A - TG5或ACD方面则不然。Pentacam HR测量的CCT与US测厚法具有合理的一致性。
