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Table 7 Comparison of the HOAs obtained by Topcon KR-1 W and iTrace

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

Aberrations Mean Difference ± SD 95% CI t P value*
Ocular
 tHOA −0.060 ± 0.118 −0.084 to − 0.036 −4.884 < 0.001
 SA 0.003 ± 0.049 −0.007 to 0.014 0.644 0.522
 Coma −0.023 ± 0.058 −0.035 to − 0.011 −3.767 < 0.001
 Second Astig − 0.010 ± 0.025 − 0.016 to − 0.005 −3.913 < 0.001
 Trefoil − 0.017 ± 0.046 −0.027 to − 0.008 −3.602 < 0.001
Cornea
 tHOA −0.047 ± 0.118 −0.071 to − 0.022 −3.801 < 0.001
 SA 0.033 ± 0.049 0.024 to 0.043 6.760 < 0.001
 Coma −0.013 ± 0.056 −0.024 to − 0.001 −2.179 0.032
 Second Astig −0.008 ± 0.027 − 0.013 to − 0.002 −2.748 0.007
 Trefoil − 0.009 ± 0.056 −0.021 to 0.002 −1.573 0.119
Internal
 tHOA −0.042 ± 0.053 −0.054 to − 0.031 −7.589 < 0.001
 SA − 0.010 ± 0.053 − 0.021 to 0.001 − 1.813 0.007
 Coma − 0.009 ± 0.064 − 0.022 to − 0.005 −1.285 0.202
 Second  Astig 0.012 ± 0.048 0.002 to − 0.022 2.343 0.021
 Trefoil −0.030 ± 0.046 −0.039 to − 0.020 −6.202 < 0.001
  1. Note: tHOA Total high order aberration, SA Spherical aberration, Second Astig Second astigmatism, SD Standard deviation, *two tailed probability