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Table 4 Interobserver reproducibility of the HOAs obtained by iTrace

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 0.176 ± 0.088 0.090 0.251 0.472 (0.200-0.651)
 SA 0.023 ± 0.044 0.040 0.111 0.589 (0.377-0.728)
 Coma 0.097 ± 0.054 0.044 0.122 0.661 (0.489-0.776)
 Second Astig 0.035 ± 0.021 0.024 0.066 0.353 (0.237-0.572)
 Trefoil 0.081 ± 0.050 0.038 0.104 0.622 (0.428-0.750)
Cornea
 tHOA 0.131 ± 0.046 0.051 0.140 0.398 (0.096-0.428)
 SA 0.046 ± 0.020 0.017 0.047 0.441 (0.155-0.631)
 Coma 0.087 ± 0.036 0.039 0.109 0.393 (0.080-0.599)
 Second Astig 0.031 ± 0.019 0.024 0.066 0.216(−0.182-0.481)
 Trefoil 0.084 ± 0.044 0.047 0.130 0.439 (0.149-0.630)
Internal
 tHOA 0.140 ± 0.048 0.036 0.100 0.716 (0.570-0.812)
 SA −0.014 ± 0.055 0.048 0.134 0.617 (0.424-0.746)
 Coma 0.077 ± 0.033 0.041 0.114 0.238(−0.147-0.495)
 Second Astig 0.043 ± 0.028 0.031 0.085 0.416 (0.116-0.614)
 Trefoil 0.077 ± 0.042 0.037 0.102 0.615 (0.418-0.746)
  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