Table 1 Comparison of keratometry of anterior and posterior corneal surfaces between Sirius (Costruzione Strumenti Oftalmici, Italy) and Scansys (MediWorks, Shanghai, China)
From: A comparison of Scansys and Sirius tomography in healthy eyes
Device | Minimum | Maximum | Mean ± SD | Correlation | ICC | Difference of mean ± SD* | 95% CI of differences of means | P-value** | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
r | P-value | Lower | Upper | ||||||||||
Anterior | Flat K (D) | Sirius | 38.50 | 46.15 | 43.18 ± 1.59 | 0.979 | < 0.001 | 0.985 | 0.14 ± 0.36 | 0.02 | 0.25 | 0.026 | |
Scansys | 39.92 | 45.85 | 43.04 ± 1.40 | ||||||||||
Steep K (D) | Sirius | 41.24 | 47.59 | 44.35 ± 1.48 | 0.964 | < 0.001 | 0.980 | 0.09 ± 0.39 | -0.04 | 0.22 | 0.156 | ||
Scansys | 40.78 | 47.53 | 44.26 ± 1.36 | ||||||||||
Astigmatism | J0 | Sirius | -0.61 | 2.23 | 0.48 ± 0.58 | 0.957 | < 0.001 | 0.978 | 0.00 ± 0.17 | -0.06 | 0.05 | 0.965 | |
Scansys | -0.58 | 2.27 | 0.48 ± 0.56 | ||||||||||
J45 | Sirius | -0.32 | 0.41 | 0.04 ± 0.18 | 0.855 | < 0.001 | 0.902 | -0.04 ± 0.13 | -0.08 | 0.00 | 0.069 | ||
Scansys | -0.41 | 0.63 | 0.08 ± 0.24 | ||||||||||
Posterior | Flat K (D) | Sirius | -5.67 | -6.47 | -6.06 ± 0.19 | 0.956 | < 0.001 | 0.977 | -0.14 ± 0.06 | -0.16 | -0.12 | < 0.001 | |
Scansys | -6.28 | -5.59 | -5.92 ± 0.20 | ||||||||||
Steep K (D) | Sirius | -6.05 | -6.97 | -6.46 ± 0.22 | 0.971 | < 0.001 | 0.985 | -0.21 ± 0.05 | -0.22 | -0.19 | < 0.001 | ||
Scansys | -6.73 | -5.84 | -6.25 ± 0.22 | ||||||||||
Astigmatism | J0 | Sirius | -0.45 | 0.05 | -0.19 ± 0.10 | 0.973 | < 0.001 | 0.984 | -0.03 ± 0.02 | -0.04 | -0.02 | < 0.001 | |
Scansys | -0.42 | 0.02 | -0.16 ± 0.09 | ||||||||||
J45 | Sirius | -0.14 | 0.07 | -0.03 ± 0.05 | 0.578 | < 0.001 | 0.732 | -0.03 ± 0.04 | -0.05 | -0.02 | < 0.001 | ||
Scansys | -0.08 | 0.12 | 0.01 ± 0.04 | ||||||||||