Dong Jing, Yao Jinhan, Chang Shuimiao, Kanclerz Piotr, Khoramnia Ramin, Wang Xiaogang
Department of Ophthalmology, The First Hospital of Shanxi Medical University, Taiyuan 030001, China.
Department of Cataract, Shanxi Eye Hospital Affiliated to Shanxi Medical University, Taiyuan 030002, China.
Diagnostics (Basel). 2022 Mar 19;12(3):754. doi: 10.3390/diagnostics12030754.
This study aims to investigate differences in the mean corneal power of annular zones (corneal power measured over the inner annular zone of difference diameters) and rings (corneal power measured over a ring of different diameters) centered on the corneal apex using the swept-source optical coherence tomography technique. The mean anterior axial curvature (AAC), posterior axial curvature (PAC), and total corneal power (TCP) centered on the corneal apex with the annular rings (0−2 mm, 2−4 mm, 4−6 mm, and 6−8 mm) and zones were assessed using the ANTERION device. The paired-sample t-test was used for data comparison. For the 0−2 mm comparison, the AAC, PAC, and TCP values of rings and zones were interchangeable. For the 2−4 mm comparison, the AAC of the rings was lower than that of the zones (p = 0.004), and the TCP values of the rings were higher than that of the zones (p < 0.001). For the 4−6 mm comparison, the AAC of the rings was lower than that of the zones (p < 0.001), and the PAC and TCP values of the rings were higher than that of the zones (both p < 0.001). For the 6−8 mm comparison, the AAC of the rings was lower than that of the zones (p < 0.001), and the PAC and TCP values of the rings were higher than that of the zones (both p < 0.001). Comparisons between AAC and TCP in each sub-region showed significant differences both in the rings (p < 0.001) and the zones (p < 0.008). Differences in the AAC, PAC, and TCP measured at different diameters (2−4 mm, 4−6 mm, and 6−8 mm) of the rings and zones, centered on the corneal apex, should be noticed in clinical practice. As the diameter increases, the difference between the rings and the zones in terms of AAC, PAC, and TCP increase as well. Clinicians should also pay attention to differences between AAC and TCP for the rings and the zones within the same annular region.
本研究旨在利用扫频光学相干断层扫描技术，研究以角膜顶点为中心的环形区域（在不同直径的内部环形区域测量的角膜屈光力）和环形带（在不同直径的环上测量的角膜屈光力）的平均角膜屈光力差异。使用ANTERION设备评估以角膜顶点为中心、带有环形环（0−2毫米、2−4毫米、4−6毫米和6−8毫米）和区域的平均前表面轴向曲率（AAC）、后表面轴向曲率（PAC）和总角膜屈光力（TCP）。采用配对样本t检验进行数据比较。对于0−2毫米的比较，环形环和区域的AAC、PAC和TCP值可互换。对于2−4毫米的比较，环形环的AAC低于区域的AAC（p = 0.004），环形环的TCP值高于区域的TCP值（p < 0.001）。对于4−6毫米的比较，环形环的AAC低于区域的AAC（p < 0.001），环形环的PAC和TCP值高于区域的PAC和TCP值（均p < 0.001）。对于6−8毫米的比较，环形环的AAC低于区域的AAC（p < 0.001），环形环的PAC和TCP值高于区域的PAC和TCP值（均p < 0.001）。每个子区域中AAC和TCP之间的比较在环形环（p < 0.001）和区域（p < 0.008）中均显示出显著差异。在临床实践中应注意以角膜顶点为中心的环形环和区域在不同直径（2−4毫米、4−6毫米和6−8毫米）处测量的AAC、PAC和TCP的差异。随着直径增加，环形环和区域在AAC、PAC和TCP方面的差异也会增加。临床医生还应注意同一环形区域内环形环和区域的AAC与TCP之间的差异。
