Skip to main content

Table 2 Intraobserver repeatability of the HOAs obtained by iTrace

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 0.180 ± 0.115 0.026 0.073 0.825 (0.752-0.879)
  2nd 0.171 ± 0.103 0.026 0.071 0.979 (0.971-0.986)
 SA 1st 0.022 ± 0.038 0.006 0.016 0.992 (0.988-0.994)
  2nd 0.024 ± 0.033 0.007 0.019 0.995 (0.993-0.997)
 Coma 1st 0.093 ± 0.057 0.011 0.031 0.989 (0.984-0.992)
  2nd 0.100 ± 0.068 0.009 0.027 0.992 (0.988-0.994)
 Second Astig 1st 0.033 ± 0.024 0.009 0.027 0.947 (0.920-0.965)
  2nd 0.037 ± 0.029 0.011 0.032 0.946 (0.923-0.963)
 Trefoil 1st 0.085 ± 0.052 0.011 0.029 0.863 (0.807-0.905)
  2nd 0.081 ± 0.050 0.010 0.027 0.984 (0.976-0.990)
Cornea
 tHOA 1st 0.138 ± 0.051 0.038 0.105 0.813 (0.737-0.871)
  2nd 0.127 ± 0.065 0.023 0.064 0.956 (0.935-0.970)
 SA 1st 0.045 ± 0.019 0.016 0.043 0.832 (0.763-0.884)
  2nd 0.047 ± 0.021 0.015 0.041 0.821 (0.745-0.876)
 Coma 1st 0.085 ± 0.045 0.027 0.074 0.863 (0.806-0.905)
  2nd 0.088 ± 0.046 0.052 0.144 0.558 (0.377-0.694)
 Second Astig 1st 0.033 ± 0.024 0.024 0.066 0.661 (0.520-0.765)
  2nd 0.028 ± 0.026 0.020 0.054 0.805 (0.721-0.867)
 Trefoil 1st 0.083 ± 0.048 0.026 0.071 0.903 (0.864-0.933)
  2nd 0.086 ± 0.043 0.022 0.062 0.908 (0.870-0.936)
Internal
 tHOA 1st 0.139 ± 0.050 0.036 0.101 0.820 (0.745-0.875)
  2nd 0.140 ± 0.058 0.035 0.096 0.881 (0.832-0.918)
 SA 1st −0.020 ± 0.057 0.038 0.105 0.851 (0.789-0.897)
  2nd −0.009 ± 0.072 0.038 0.105 0.906 (0.867-0.935)
 Coma 1st 0.081 ± 0.052 0.052 0.143 0.610 (0.448-0.730)
  2nd 0.073 ± 0.041 0.048 0.133 0.426 (0.143-0.618)
 Second Astig 1st 0.042 ± 0.038 0.028 0.078 0.816 (0.739-0.872)
  2nd 0.045 ± 0.033 0.028 0.076 0.758 (0.658-0.833)
 Trefoil 1st 0.076 ± 0.045 0.026 0.073 0.886 (0.839-0.921)
  2nd 0.078 ± 0.053 0.022 0.062 0.940 (0.914-0.959)
  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