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Table 1 Intraobserver repeatability of the HOAs obtained by Topcon KR-1W

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

Aberrations Observers Mean ± SD (um) Sw (um) 2.77Sw (um) ICC
Ocular
 tHOA 1st 0.127 ± 0.062 0.015 0.041 0.966 (0.952-0.977)
  2nd 0.123 ± 0.056 0.015 0.041 0.957 (0.940-0.970)
 SA 1st 0.026 ± 0.034 0.010 0.027 0.972 (0.960-0.980)
  2nd 0.026 ± 0.033 0.011 0.031 0.961 (0.945-0.973)
 Coma 1st 0.070 ± 0.037 0.015 0.042 0.945 (0.923-0.962)
  2nd 0.070 ± 0.038 0.017 0.047 0.931 (0.902-0.952)
 Second Astig 1st 0.022 ± 0.013 0.008 0.022 0.869 (0.814-0.909)
  2nd 0.021 ± 0.012 0.009 0.024 0.837 (0.770-0.887)
 Trefoil 1st 0.068 ± 0.032 0.015 0.043 0.923 (0.891-0.947)
  2nd 0.066 ± 0.032 0.013 0.036 0.944 (0.921-0.961)
 Tetrafoil 1st 0.029 ± 0.017 0.009 0.025 0.903 (0.863-0.933)
  2nd 0.027 ± 0.018 0.011 0.029 0.881 (0.832-0.918)
Cornea
 tHOA 1st 0.133 ± 0.051 0.020 0.055 0.948 (0.927-0.964)
  2nd 0.132 ± 0.049 0.023 0.063 0.926 (0.895-0.948)
 SA 1st 0.056 ± 0.022 0.009 0.025 0.939 (0.914-0.958)
  2nd 0.054 ± 0.021 0.012 0.035 0.880 (0.830-0.917)
 Coma 1st 0.073 ± 0.040 0.013 0.038 0.964 (0.949-0.975)
  2nd 0.074 ± 0.039 0.018 0.051 0.923 (0.893-0.948)
 Second Astig 1st 0.025 ± 0.015 0.009 0.024 0.889 (0.843-0.923)
  2nd 0.024 ± 0.018 0.011 0.030 0.876 (0.825-0.914)
 Trefoil 1st 0.074 ± 0.044 0.017 0.046 0.952 (0.933-0.967)
  2nd 0.071 ± 0.043 0.019 0.052 0.936 (0.910-0.956)
 Tetrafoil 1st 0.029 ± 0.018 0.011 0.032 0.867 (0.811-0.908)
  2nd 0.030 ± 0.019 0.017 0.047 0.740 (0.633-0.820)
Internal
 tHOA 1st 0.097 ± 0.032 0.029 0.079 0.728 (0.616-0.812)
  2nd 0.097 ± 0.036 0.026 0.071 0.834 (0.767-0.885)
 SA 1st −0.030 ± 0.031 0.012 0.033 0.951 (0.931-0.966)
  2nd −0.029 ± 0.031 0.020 0.056 0.855 (0.795-0.900)
 Coma 1st 0.053 ± 0.027 0.022 0.062 0.776 (0.683-0.845)
  2nd 0.053 ± 0.029 0.021 0.059 0.819 (0.744-0.875)
 Second Astig 1st 0.053 ± 0.027 0.022 0.062 0.776 (0.683-0.845)
  2nd 0.054 ± 0.029 0.022 0.062 0.802 (0.720-0.863)
 Trefoil 1st 0.046 ± 0.021 0.019 0.053 0.864 (0.808-0.906)
  2nd 0.044 ± 0.020 0.019 0.053 0.690 (0.561-0.785)
 Tetrafoil 1st 0.029 ± 0.019 0.012 0.033 0.770 (0.675-0.841)
  2nd 0.029 ± 0.016 0.013 0.037 0.761 (0.661-0.834)
  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