Figure 2. Composite RetCam images (top panels) and the retinal arterioles as segmented by RISA (bottom panels). The images were obtained from a 50/10 model, a 75 model, and a control rat at P25–26. The posterior pole, defined as the region bounded by the vortex veins and concentric to the optic nerve head, is indicated (circles). The integrated curvatures (radians∙pixel⁻¹) corresponding to each segmented vessel are given. The mean tortuosity of the arterioles, T_A (radians∙pixel⁻¹), for each eye is given at the bottom of the figure.