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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