Figure 3From: From line to dots: an improved computerised rod and frame system for testing subjective visual vertical and horizontalBland and Altman plots showing agreement between line and dots. Bland Altman plots of method agreement comparing the use of a line versus dots to test for subjective visual vertical (a) and horizontal (b) when the frame is tilted (n = 30). Solid line represents the mean difference of errors (d) while the dashed lines represent the upper and lower limits of agreement.Back to article page