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Bland-Altman plot comparing the mean retinal nerve fiber layer (RNFL) thickness measurements obtained with spectral domain (SD)-optical coherence tomography (OCT) and time domain (TD)-OCT. The difference between both measurements is plotted against the average of both measurements (slope = -0.233, p < 0.001). Mean difference ± standard deviation: SD-OCT minus TD-OCT, -5.67 ± 7.11 µm; 95% confidence interval, -6.44 to -4.89; limits of agreement, -19.6 to 8.3 µm.
