Figure 2.

Visual representation of ocular biometrics. The 3D model of the orbit segmentation (pink) is overlaid on coronal and sagittal slices taken from a 3D reconstruction of the fetal head. (a) Binocular distance (BOD), the greatest distance between two voxels from opposite orbits; (b) interocular distance (IOD), the smallest distance between two voxels from opposite orbits; (c) ocular diameter* (OD), the greatest distance between two voxels from a single orbit. Volume* is calculated as the total number of voxels in the orbit segmentation multiplied by voxel volume.

*Average of left and right measurements.