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Table 1 Intraobserver repeatability outcomes for anterior corneal aberrations

From: Repeatability and reproducibility of corneal higher-order aberrations measurements after small incision lenticule extraction using the Scheimpflug-Placido topographer

Parameter Operator Mean ± SD (μm) Sw (μm) TRT (μm) ICC (95% CI)
Total RMS 1st 1.27 ± 0.42 0.05 0.14 0.985 (0.979–0.990)
2nd 1.29 ± 0.42 0.07 0.19 0.973 (0.961–0.982)
Higher-order RMS 1st 0.63 ± 0.18 0.03 0.10 0.964 (0.948–0.976)
2nd 0.64 ± 0.18 0.04 0.10 0.960 (0.942–0.973)
Coma Z (3, ± 1) 1st 0.36 ± 0.20 0.04 0.10 0.967 (0.952–0.978)
2nd 0.36 ± 0.20 0.04 0.10 0.967 (0.952–0.978)
Trefoil Z (3, ± 3) 1st 0.17 ± 0.08 0.04 0.12 0.768 (0.682–0.838)
2nd 0.19 ± 0.09 0.05 0.13 0.763 (0.676–0.834)
SA Z (4, 0) 1st 0.40 ± 0.12 0.02 0.06 0.969 (0.955–0.980)
2nd 0.40 ± 0.12 0.02 0.06 0.967 (0.953–0.978)
Ast II Z (4, ± 2) 1st 0.13 ± 0.09 0.02 0.06 0.951 (0.929–0.967)
2nd 0.14 ± 0.09 0.02 0.07 0.931 (0.900–0.953)
  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