Ng Alex L K, Chan Tommy C Y, Cheng Arthur C K
Department of Ophthalmology (A.L.K.N.), LKS Faculty of Medicine, The University of Hong Kong, Hong Kong; Department of Ophthalmology and Visual Sciences (T.C.Y.C.), The Chinese University of Hong Kong, Hong Kong; and Department of Ophthalmology (A.C.K.C.), Hong Kong Sanatorium and Hospital, Hong Kong.
Eye Contact Lens. 2018 Nov;44 Suppl 2:S370-S375. doi: 10.1097/ICL.0000000000000503.
To compare the various Pentacam-measured K-readings with the clinical history method (CHM) in eyes that have undergone myopic laser in situ keratomileusis (LASIK).
In this prospective study, Pentacam examination was performed in 71 eyes 1 month after myopic LASIK. The true net power (TNP) 4 mm, total corneal refractive power (TCRP) 4 mm, equivalent K-reading (EKR) 4.0 mm, and EKR 4.5 mm obtained from the same scan were compared with the K derived from CHM.
The average baseline spherical equivalence was -5.44±2.38 D. After LASIK, the mean KCHM was 37.67±2.13 D, TCRP4mm was 37.14±1.79 D, TNP4mm was 36.88±1.76 D, EKR4.0mm was 37.58±1.94 D, and EKR4.5mm was 37.51±1.94 D. TCRP4mm, TNP4mm, and EKR4.5mm showed a statistically significant deviation from the KCHM, with the mean error being 0.53 D, 0.79 D, and 0.16 D, respectively (P<0.05). Only the EKR4.0mm showed no statistically significant difference from the KCHM (mean error 0.09 D, P=0.23). The EKR4.0mm also had the narrowest 95% limits of agreement (LoA) (-1.10 to +1.28 D), whereas both TCRP4mm and TNP4mm had a wider LoA (-0.88 to +1.95 D and -0.62 to +2.20 D, respectively). All four Pentacam K-readings had a strong and statistically significant correlation with the KCHM.
Using the CHM as reference, the EKR4.0mm demonstrated the closest agreement when compared with the EKR4.5mm, TNP4mm, and TCRP4mm obtained from the same scan.
比较在接受准分子原位角膜磨镶术（LASIK）的眼中，Pentacam测量的各种角膜曲率读数与临床病史法（CHM）的结果。
在这项前瞻性研究中，对71只眼在近视LASIK术后1个月进行Pentacam检查。将同一扫描获得的4mm处真实净屈光力（TNP）、4mm处总角膜屈光力（TCRP）、4.0mm等效角膜曲率读数（EKR）和4.5mm EKR与CHM得出的角膜曲率（K）进行比较。
平均基线球镜等效度为-5.44±2.38D。LASIK术后，平均KCHM为37.67±2.13D，TCRP4mm为37.14±1.79D，TNP4mm为36.88±1.76D，EKR4.0mm为37.58±1.94D，EKR4.5mm为37.51±1.94D。TCRP4mm、TNP4mm和EKR4.5mm与KCHM相比有统计学显著偏差，平均误差分别为0.53D、0.79D和0.16D（P<0.05）。只有EKR4.0mm与KCHM相比无统计学显著差异（平均误差0.09D，P=0.23）。EKR4.0mm的95%一致性界限（LoA）也最窄（-1.10至+1.28D），而TCRP4mm和TNP4mm的LoA更宽（分别为-0.88至+1.95D和-0.62至+2.20D）。所有四个Pentacam角膜曲率读数与KCHM均有强且统计学显著的相关性。
以CHM为参考，与同一扫描获得的EKR4.5mm、TNP4mm和TCRP4mm相比，EKR4.0mm显示出最接近的一致性。
