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)	S_w (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)

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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