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Table 5 Intersession reproducibility of the HOAs obtained by Topcon KR-1 W

From: Precision and agreement of higher order aberrations measured with ray tracing and Hartmann-Shack aberrometers

Aberrations Mean ± SD (um) Sw (um) 2.77Sw (um) ICC
Ocular
 tHOA 0.127 ± 0.057 0.032 0.089 0.736 (0.600-0.825)
 SA 0.025 ± 0.032 0.013 0.037 0.912 (0.869-0.943)
 Coma 0.073 ± 0.036 0.024 0.066 0.770 (0.653-0.848)
 Second Astig 0.023 ± 0.011 0.010 0.028 0.571 (0.353-0.715)
 Trefoil 0.068 ± 0.032 0.022 0.061 0.761 (0.639-0.842)
 Tetrafoil 0.028 ± 0.014 0.012 0.032 0.653 (0.476-0.771)
Cornea
 tHOA 0.129 ± 0.040 0.032 0.088 0.682 (0.521-0.789)
 SA 0.054 ± 0.020 0.015 0.042 0.689 (0.532-0.794)
 Coma 0.073 ± 0.034 0.032 0.088 0.581 (0.365-0.723)
 Second Astig 0.025 ± 0.012 0.013 0.036 0.401 (0.091-0.605)
 Trefoil 0.071 ± 0.037 0.026 0.073 0.751 (0.624-0.835)
 Tetrafoil 0.029 ± 0.013 0.014 0.039 0.435 (0.143-0.627)
Internal
 tHOA 0.096 ± 0.026 0.022 0.062 0.638 (0.453-0.761)
 SA −0.029 ± 0.028 0.014 0.038 0.878 (0.816-0.919)
 Coma 0.053 ± 0.024 0.021 0.059 0.628 (0.436-0.754)
 Second Astig 0.053 ± 0.024 0.021 0.059 0.628 (0.436-0.754)
 Trefoil 0.047 ± 0.019 0.021 0.057 0.422 (0.123-0.618)
 Tetrafoil 0.029 ± 0.012 0.016 0.045 0.107 (0.008-0.219)
  1. Note: tHOA Total high order aberration, SA Spherical aberration, Second Astig Second astigmatism, SD Standard deviation, Sw Within-subject standard deviation, ICC Intraclass correlation coefficient