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Table 4 Interobserver reproducibility for anterior 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 1.28 ± 0.42 0.04 0.12 0.989 (0.982–0.993)
Higher-order RMS 0.64 ± 0.18 0.02 0.07 0.983 (0.973–0.989)
Coma Z (3, ± 1) 0.36 ± 0.20 0.03 0.07 0.984 (0.974–0.990)
Trefoil Z (3, ± 3) 0.18 ± 0.08 0.03 0.08 0.875 (0.802–0.921)
SA Z (4, 0) 0.40 ± 0.12 0.01 0.03 0.989 (0.983–0.993)
Ast II Z (4, ± 2) 0.13 ± 0.09 0.01 0.04 0.974 (0.960–0.984)
  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