Fig. 1

The Bland Altman plots for intra and inter-observer assessment of LLT using the interferometer. The difference between 2 measurements was plotted against the average of the measurements (nm). For the randomly selected eyes, the intra-observer repeatability (a), single scan, inter-observer repeatability (b) and averaged-3-scan inter-observer repeatability (c) plots are shown. +95 %SD and −95 %SD refer to the upper limit and lower limit of agreement respectively