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Table 5 Interobserver reproducibility for posterior 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 0.36 ± 0.11 0.02 0.05 0.976 (0.962–0.985)
Higher-order RMS 0.11 ± 0.03 0.01 0.04 0.845 (0.766–0.899)
Coma Z (3, ± 1) 0.03 ± 0.02 0.00 0.01 0.967 (0.948–0.979)
Trefoil Z (3, ± 3) 0.06 ± 0.03 0.02 0.05 0.686 (0.544–0.789)
SA Z (4, 0) 0.02 ± 0.02 0.01 0.01 0.886 (0.826–0.926)
Ast II Z (4, ± 2) 0.02 ± 0.01 0.00 0.01 0.819 (0.728–0.882)
  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