OPD-ScanⅢ与Pentacam测量角膜屈光力和散光的一致性

doi:10.3760/cma.j.cn115909-20200612-00253

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Abstract Objective: To analyze the correlation and agreement of keratometry (K), corneal astigmatism (CA) and the axis measured by OPD-Scan III and Pentacam in patients with low or high CA. Methods: In this case series studies, 876 patients (1 072 eyes) with refractive errors, who were admitted to the Ideal Ophthalmology Hospital Affiliated to Soochow University, were recruited from June to December 2019. Patients were divided into low (301 patients) and high (771 patients) CA groups. Keratometry in the flattest axis (K1), keratometry in the steepest axis (K2), CA and axis, vector parameters J0 (the Jackson cross cylindrical values at 0° or 180°) and the Jackson cross cylindrical values at 45° (J45) were evaluated. The measurement results were analyzed, to show in which the axis was the median of the three successive measurements. A t-test or Wilcoxon test was used to assess differences. A Spearman correlation was used to assess correlations. The Bland-Altman method was used to assess agreement. Results: In the low CA group, the differences of K1, K2 and CA measured by OPD-Scan III and Pentacam were significant (t=4.991, P=0.001; Z=2.310, P=0.022; Z=-2.891, P=0.004). The 95% limits of agreement (LOA) of OPD-Scan III and Pentacam in measuring K1, K2, CA, axis, J0 and J45 were -0.31, 0.35 D, -0.32, 0.42 D, -0.32, 0.38 D, -27.86°, 27.96°, -0.19, 0.21 D and -0.18, 0.18 D, respectively. In the high CA group, the differences of K1, K2, CA, axis, J0 and J45 measured by OPD-Scan III and Pentacam were significant (t=-10.763, P<0.001; t=6.046, P<0.001; Z=-2.335, P=0.020; Z=-5.480, P<0.001; Z=-1.997, P=0.046; Z=-6.079, P<0.001). The 95%LOA of the OPD-Scan III and Pentacam in measuring K1, K2, CA, axis, J0 and J45 were -0.27, 0.39 D, -0.34, 0.44 D, -0.44, 0.42 D, -11.15°, 13.55°, -0.25, 0.23 D and -0.25, 0.33 D, respectively. There were significant correlations between the two devices in terms of K1, K2, CA and axis, J0 or J45 in both the low and high CA groups (all P<0.05). Conclusions: OPD-Scan III shows a high agreement with Pentacam in measuring keratometry and the axis in patients with high CA. However, its measurement of CA and the axis in patients with low CA has low agreement with Pentacam.

Key words： OPD-Scan III Pentacam keratometry corneal astigmatism axis of astigmatism agreement

Received: 12 June 2020

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Fund: Project of Nantong Health Committee (MB2019005)

Corresponding Authors: Ying Wu, Department of Ophthalmology, Second Affiliated Hospital of Nantong University (Nantong City No.1 People's Hospital ), Nantong 226001, China (Email: wuyingeye@126.com)

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