Bland-Altman plot of subfoveal choroidal thickness (SFChT) and choroidal volume. (a) Bland-Altman plot of SFChT measurements taken by two independent retina specialists. No substantial bias was found between the two sets of measurements. The 95% limit of agreement for the SFChT ranged from −14.40 to 13.93. (b) Bland-Altman plot of choroidal volume measurements showing no substantial bias between the two sets of measurements. The 95% limit of agreement for the choroidal volume measurement ranged from −0.186 to 0.165.