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

BMC Ophthalmology

Table 4 Interobserver reproducibility of the HOAs obtained by iTrace

Aberrations	Mean ± SD (um)	Sw (um)	2.77Sw (um)	ICC
Ocular
tHOA	0.176 ± 0.088	0.090	0.251	0.472 (0.200-0.651)
SA	0.023 ± 0.044	0.040	0.111	0.589 (0.377-0.728)
Coma	0.097 ± 0.054	0.044	0.122	0.661 (0.489-0.776)
Second Astig	0.035 ± 0.021	0.024	0.066	0.353 (0.237-0.572)
Trefoil	0.081 ± 0.050	0.038	0.104	0.622 (0.428-0.750)
Cornea
tHOA	0.131 ± 0.046	0.051	0.140	0.398 (0.096-0.428)
SA	0.046 ± 0.020	0.017	0.047	0.441 (0.155-0.631)
Coma	0.087 ± 0.036	0.039	0.109	0.393 (0.080-0.599)
Second Astig	0.031 ± 0.019	0.024	0.066	0.216(−0.182-0.481)
Trefoil	0.084 ± 0.044	0.047	0.130	0.439 (0.149-0.630)
Internal
tHOA	0.140 ± 0.048	0.036	0.100	0.716 (0.570-0.812)
SA	−0.014 ± 0.055	0.048	0.134	0.617 (0.424-0.746)
Coma	0.077 ± 0.033	0.041	0.114	0.238(−0.147-0.495)
Second Astig	0.043 ± 0.028	0.031	0.085	0.416 (0.116-0.614)
Trefoil	0.077 ± 0.042	0.037	0.102	0.615 (0.418-0.746)

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