Figure 4

Diagram describing methodology of LC curvature measurement. (A) BMO points (blue dots) with 17 yellow dots delineating the anterior surface of the LC are shown. The yellow dots were interpolated with the cardinal spline curve-fitting method (blue curve). The blue curve was separated into 17 points at regular intervals (red points). The circumcenter of the triplet of adjacent red points along the blue curve was calculated as the curvature index (green arrow). The average of the nasal side is presented as the nasal LC curvature, and the average of the temporal side is presented as the temporal LC curvature. (B) The right column provides a schematic version of each corresponding left-column image.