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Table 3 Intraobserver repeatability outcomes for total corneal aberrations

From: Repeatability and reproducibility of corneal higher-order aberrations measurements after small incision lenticule extraction using the Scheimpflug-Placido topographer

Parameter Operator Mean ± SD (μm) Sw (μm) TRT (μm) ICC (95% CI)
Total RMS 1st 1.01 ± 0.33 0.05 0.14 0.979 (0.969–0.986)
2nd 1.03 ± 0.33 0.07 0.19 0.957 (0.937–0.971)
Higher-order RMS 1st 0.62 ± 0.18 0.03 0.10 0.964 (0.947–0.976)
2nd 0.63 ± 0.18 0.04 0.11 0.953 (0.932–0.968)
Coma Z (3, ± 1) 1st 0.35 ± 0.19 0.04 0.10 0.965 (0.949–0.977)
2nd 0.34 ± 0.20 0.04 0.12 0.955 (0.935–0.970)
Trefoil Z (3, ± 3) 1st 0.17 ± 0.09 0.05 0.14 0.722 (0.624–0.803)
2nd 0.19 ± 0.09 0.05 0.15 0.722 (0.625–0.803)
SA Z (4, 0) 1st 0.38 ± 0.12 0.02 0.06 0.967 (0.953–0.978)
2nd 0.38 ± 0.12 0.02 0.07 0.964 (0.948–0.976)
Ast II Z (4, ± 2) 1st 0.14 ± 0.09 0.02 0.06 0.944 (0.919–0.962)
2nd 0.14 ± 0.09 0.03 0.07 0.922 (0.888–0.947)
  1. SD = standard deviation; Sw = within-subject standard deviation; TRT = test-retest repeatability (2.77 Sw); ICC = intraclass correlation coefficient; RMS = root mean square; SA = spherical aberration; Ast = astigmatism