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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