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. 2016 Jul 13;57(9):OCT196–OCT203. doi: 10.1167/iovs.15-18886

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Relationship between asphericity (Q_xz) and spherical equivalent refractive error as measured by MRI (left) and OCT (center). The red lines are linear regressions with R² of 0.25, 0.07, and 0.0009 from left to right. Rather than an exact fitting of the data, the linear regressions show the general trend of less oblateness as myopia increases in both MRI and OCT measures of Q_xz. The right figure shows the paired differences between OCT measures of Q_xz by MRI and OCT as a function of refractive error. Refractive error did not appear to affect the differences between MRI and OCT (slope = −0.06).