Figure 2: Bland and Altman Graph presenting the difference between logMAR acuity measured with CVA at 50% Michelson contrast (white letter on a black background) and the visual acuity measured with the ETDRS chart of the same contrast (black letter on a white background) calculated by total letter count (TLC) plotted against the average of the two measurements. Horizontal lines represent the 95% confidence limits (logMAR). Total number of eyes measured 481.