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

BMC Ophthalmology

Table 5 Intersession reproducibility of the HOAs obtained by Topcon KR-1 W

Aberrations	Mean ± SD (um)	Sw (um)	2.77Sw (um)	ICC
Ocular
tHOA	0.127 ± 0.057	0.032	0.089	0.736 (0.600-0.825)
SA	0.025 ± 0.032	0.013	0.037	0.912 (0.869-0.943)
Coma	0.073 ± 0.036	0.024	0.066	0.770 (0.653-0.848)
Second Astig	0.023 ± 0.011	0.010	0.028	0.571 (0.353-0.715)
Trefoil	0.068 ± 0.032	0.022	0.061	0.761 (0.639-0.842)
Tetrafoil	0.028 ± 0.014	0.012	0.032	0.653 (0.476-0.771)
Cornea
tHOA	0.129 ± 0.040	0.032	0.088	0.682 (0.521-0.789)
SA	0.054 ± 0.020	0.015	0.042	0.689 (0.532-0.794)
Coma	0.073 ± 0.034	0.032	0.088	0.581 (0.365-0.723)
Second Astig	0.025 ± 0.012	0.013	0.036	0.401 (0.091-0.605)
Trefoil	0.071 ± 0.037	0.026	0.073	0.751 (0.624-0.835)
Tetrafoil	0.029 ± 0.013	0.014	0.039	0.435 (0.143-0.627)
Internal
tHOA	0.096 ± 0.026	0.022	0.062	0.638 (0.453-0.761)
SA	−0.029 ± 0.028	0.014	0.038	0.878 (0.816-0.919)
Coma	0.053 ± 0.024	0.021	0.059	0.628 (0.436-0.754)
Second Astig	0.053 ± 0.024	0.021	0.059	0.628 (0.436-0.754)
Trefoil	0.047 ± 0.019	0.021	0.057	0.422 (0.123-0.618)
Tetrafoil	0.029 ± 0.012	0.016	0.045	0.107 (0.008-0.219)

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