Fig. 1From: Precision and agreement of higher order aberrations measured with ray tracing and Hartmann-Shack aberrometersBland-Altman plots present the mean plotted against the differences in values of ocular tHOA (a), SA (b), Coma (c), Second Astig (d) and Trefoil (e) for a comparison between the Topcon KR-1 W and iTrace methods. The solid line indicates the mean difference. The interval between upper and lower lines represents the 95% LoABack to article page