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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