Soft tissue structures were measured by computed tomography (CT) at the axial section of a 58-year-old female dysthyroid optic neuropathy (DON) patient. The axial section at the midglobe level showed the interzygomatic line (IZ) (labeled line a) and maximum horizontal diameters of the right lateral rectus muscle (labeled line b and the length was 9.11 mm) and the medial rectus muscle (labeled line c and the length was 10.48 mm). The distance from the midpoint of the maximum muscular diameter of the lateral rectus muscle (labeled line d and the length was 17.47 mm) and medial rectus muscle (labeled line e and the length was 13.88 mm) to the IZ was recorded. Proptosis of the right eyeball was measured from the center of the anterior cornea to the IZ (labeled line f and the length was 24.66 mm). The optic nerve stretch of the left eyeball was measured from the retrobulbar optic nerve to the orbital apex point (labeled line g and the length was 36.21 mm). Intracranial fat prolapse was present in the right eye (labeled h), and the red line connected the most inner border of the sphenoid wing and the most anterior border of the sphenoid body groove.