Optic Nerve Sheath Diameter (ONSD) on ultrasound has been used to identify patients with high intracranial pressure. ONSD threshold measurements for high ICP range from 5 to 6mm. Unfortunately there´s not really been any reference values. A study in Journal of Critical Care measures on ONSD in healthy volunteers,reporting a mean ONSD of 3.68 mm. (95% confidence interval [CI], 2.85-4.40). There wa s a significant difference between men and women at  3.78 mm and  3.60 mm, respectively.

Study lives here.

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