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)	S_w (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)

SD = standard deviation; S_w = within-subject standard deviation; TRT = test-retest repeatability (2.77 S_w); ICC = intraclass correlation coefficient; RMS = root mean square; SA = spherical aberration; Ast = astigmatism

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