Figure 2.

Bar graphs for regional variability in rim area. Top row = normal eyes, standard reference plane (ref plane); middle row = normal eyes, 320 μm reference plane; bottom row = glaucoma eyes, standard and 320 μm reference plane. Intraop intravis = intraoperator-intravisit agreement, interop intravis = interoperator-intravisit agreement, intraop intervis = intraoperator-intervisit agreement, interop intervis = interoperator-intervisit agreement. Each bar = 95% agreement interval for a 30° sector of rim area. Sectors located on ONH circumference (0–360°), with 0° = temporal, 90° = superior, 180° = nasal, 270° = inferior. Schematic diagrams show sectors in which variability increased significantly (normal eyes, p<0.05) with testing by different operators or in different visits. A = standard reference plane, B = 320 μm reference plane; both left eye aspects. Shaded regions = 30° sectors with significantly greater (p<0.05) intraoperator-intervisit, interoperator-intravisit, or interoperator-intervisit variability compared with intraoperator-intravisit variability. 0° = temporal, 90° = superior, 180° = nasal, 270° = inferior.