These fractures are usually caused by blunt-force injury to the malar eminence of the body of the zygoma. The fractures essentially pass through or near the zygoma's sutures with adjacent bones, including the frontozygomatic, zygomatico-maxillary, and the zygomatico-temporal. Fractures typically affecting the orbit include wall, floor and roof blowout or trapdoor fractures, Le Fort types II and III fractures and zygomaticomaxillary fractures (formerly known as tripod fractures). within the space bounded by the cone formed by the extraocular muscles, or whether it is located within the conal or extraconal space? We will first describe the anatomic spaces of the. Traumatic optic neuropathy (TON) can cause acute vision loss after head trauma, either due to indirect shearing forces or direct trauma, i., by a bony fragment of an optic canal fracture (OCF). 2); and (2) orbital floor with the linear weak infraorbital canal ( Fig. These should be. The clinical diagnosis of indirect optic nerve injury rests on an ophthalmologic examination that excludes globe injury and can demonstrate an afferent pupillary defect.