Three-dimensional non-parametric method for limbus detection - Fig 4

Mean difference (δ) between the limbus contours and the white-to-white contours for right and left eyes. N, T, S & I stand for nasal, temporal, superior and inferior sides respectively. The red line is the angle at which the limbus contour recorded the maximum diversion from the white-to-white contour, while the green line is the angle of the minimum diversion.