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)	S_w (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)

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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