Figure 5: 51-year-old female patient. (a) Preoperatively: severe active TAO with DON (visual acuity OD 0.6; OS 0.4), no diplopia. (b) Six months after combined medial and lateral wall decompression: visual acuity improved to OD 0.8 and OS 0.6; esotropia was induced leading to double vision in all directions of gaze. (c) Postoperatively: CT scan demonstrates definite movement of the rectus muscles into the newly created space in the paranasal sinuses and temporal fossa.