Optic nerve sheath dissection decompression is a direct transorbital procedure that exposes the intraorbital segment of the optic nerve and dissects the intraorbital segment of the optic nerve sheath thereby draining cerebrospinal fluid into the orbital tissue and reducing intracranial pressure. This procedure is much less risky than optic canal decompression. The procedure is currently used abroad mainly for vision loss and visual field defects due to Idiopathic Intracranial Hypertension (IIH), but also in patients with persistent intracranial hypertensive compression of the optic nerve from any cause (e.g., cryptococcal meningitis), and in patients with post-traumatic subarachnoid hemorrhage of the optic nerve. studies suggest that it may be useful in patients with non-arteritic ischemic optic neuropathy.