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

BMC Ophthalmology

Table 3 Interobserver reproducibility of the HOAs obtained by Topcon KR-1 W

Aberrations	Mean ± SD (um)	Sw (um)	2.77Sw (um)	ICC
Ocular
tHOA	0.125 ± 0.055	0.027	0.076	0.772 (0.656-0.738)
SA	0.026 ± 0.032	0.013	0.036	0.920 (0.879-0.947)
Coma	0.070 ± 0.034	0.021	0.058	0.820 (0.728-0.881)
Second Astig	0.022 ± 0.011	0.009	0.025	0.644 (0.461-0.765)
Trefoil	0.067 ± 0.030	0.015	0.043	0.865 (0.796-0.910)
Tetrafoil	0.028 ± 0.015	0.011	0.031	0.721 (0.579-0.815)
Cornea
tHOA	0.133 ± 0.045	0.029	0.081	0.790 (0.682-0.861)
SA	0.055 ± 0.019	0.014	0.039	0.723 (0.581-0.817)
Coma	0.073 ± 0.037	0.021	0.058	0.842 (0.761-0.896)
Second Astig	0.025 ± 0.014	0.012	0.033	0.662 (0.489-0.777)
Trefoil	0.072 ± 0.040	0.025	0.069	0.804 (0.704-0.870)
Tetrafoil	0.029 ± 0.016	0.013	0.037	0.661 (0.487-0.776)
Internal
tHOA	0.097 ± 0.030	0.022	0.061	0.742 (0.609-0.829)
SA	−0.029 ± 0.029	0.015	0.042	0.862 (0.791-0.909)
Coma	0.053 ± 0.024	0.019	0.054	0.690 (0.530-0.795)
Second Astig	0.053 ± 0.025	0.019	0.053	0.696 (0.539-0.799)
Trefoil	0.045 ± 0.017	0.017	0.046	0.499 (0.243-0.669)
Tetrafoil	0.029 ± 0.012	0.013	0.037	0.364 (0.347-0.580)

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

ISSN: 1471-2415