Table 3.

Optic nerve sheath diameters in four patients who were observed longitudinally comparing the values obtained when the shunts were occluded and when they were patent

	ONSD at time of shunt revision			ONSD during intervening period
Patient	Range	Mean	SD	Range	Mean	SD
1	5.0–8.0 mm	6.2 mm	1.1	2.5–4.0 mm	3.3 mm	0.9
2	4.4–5.6 mm	5.0 mm	0.3	2.2–4.3 mm	3.1 mm	0.6
3	4.5–6.0 mm	5.6 mm	0.7	3.5–4.4 mm	3.9 mm	0.4
4	4.3–5.7 mm	4.8 mm	0.6	2.5–4.6 mm	3.4 mm	0.5