Fig. 2From: 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 corneal tHOA (a), SA (b), Coma (c), Second Astig (d) and Trefoil (e) for a comparison between the Topcon KR-1 W and iTrace. The solid line indicates the mean difference. The interval between the upper and lower lines represents the 95% LoABack to article page