Fig. 3From: Ultrasonic optic nerve sheath diameter can be used as a diagnostic measure after accidental dural puncture during cesarean section: a case reportThe ONSD (yellow line) was measured 3 mm behind the eyeball and perpendicular to the linear axis of the optic nerve. The ONSD was 6.0 mm on the left and 6.2 mm on the right side. ONSD: optic nerve sheath diameterBack to article page