It has been recognized for many years that the intraocular pressure follows acute alterations in blood pressure.1,2 Thus, acute elevation of arterial pressure is associated with a rapid and unsustained rise of ocular pressure, while a fall in arterial pressure, such as follows ligation of the inferior vena cava, results in a transient fall in ocular pressure. Likewise, alterations in the venous pressure in the head and eye are associated with similar changes in the ocular pressure, as illustrated by the elevation of intraocular pressure when the jugular vein is compressed or the vortex or anterior ciliary veins are ligated.3,4 These alterations are most readily interpreted as resulting from changes in the intraocular blood volume. One would not expect changes in aqueous inflow or outflow or in rigidity of the ocular coats to result in such immediate changes.
The Valsalva maneuver, a procedure in which the intrathoracic pressure
ROSEN DA, JOHNSTON VC. Ocular Pressure Patterns in the Valsalva Maneuver. AMA Arch Ophthalmol. 1959;62(5):810-816. doi:10.1001/archopht.1959.04220050072012