Raised intracranial pressure (ICP) is a frequent condition in neurosurgical care and is associated with poor neurological outcome. Invasive devices are the gold standard for continuous and reliable assessment of ICP. Invasive devices for monitoring ICP, however, require expertise and normal coagulation blood tests in order to be placed safely (1, 2). The optic nerve is surrounded by a dura mater sheath that is distensible when cerebrospinal fluid pressure rises. Measurement of the optic nerve sheath diameter (ONSD) using ocular sonography is a simple and noninvasive tool that can be performed at the patient’s bedside. This method predicts raised ICP in various settings, including traumatic brain injury (3) .