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Bland-Altman plot of the retinal thickness for all measurements points with the Cirrus OCT and the Heidelberg OCT. The y-axis shows the difference in retinal thickness (μm) between measurements obtained using the Heidelberg OCT and Cirrus OCT, and the x-axis shows the mean sum of the two instruments. The mean difference of 1.85 μm is shown with a stippled line, and the mean ± 2SD is shown with solid lines
