Point-of-care ultrasonography for detecting raised intracranial pressure through optic nerve sheath diameter in non-traumatic headache patients

Figure 2 Ultrasonographic technique for measuring optic nerve sheath diameter using point-of-care ultrasound. A: Proper ultrasound probe placement over the closed eyelid for optic nerve sheath diameter measurement; B: Sonographic image of the optic nerve sheath diameter with calipers placed 3 mm posterior to the retina. ONSD: Optic nerve sheath diameter.