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Table 6 Interobserver reproducibility for total corneal aberrations between the two observers

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

Parameter Mean ± SD (μm) Sw (μm) TRT (μm) ICC (95% CI)
Total RMS 1.02 ± 0.33 0.04 0.11 0.987 (0.978–0.992)
Higher-order RMS 0.62 ± 0.18 0.02 0.07 0.981 (0.970–0.988)
Coma Z (3, ± 1) 0.35 ± 0.20 0.03 0.08 0.979 (0.968–0.987)
Trefoil Z (3, ± 3) 0.18 ± 0.09 0.04 0.10 0.834 (0.744–0.893)
SA Z (4, 0) 0.38 ± 0.12 0.01 0.04 0.989 (0.983–0.993)
Ast II Z (4, ± 2) 0.14 ± 0.09 0.02 0.04 0.985 (0.954–0.982)
  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