The effect of vascular responses in the eye on the regulation of intraocular pressure (IOP) has been of continuing interest. A few of the early studies on animals by Adamük,1 Lullies,5 Leber,4 Weiss,10-11 and Bartels2 were followed later by studies by Duke-Elder3 and Seidel.8-9 In some of the studies, no attempt was made to measure eye venous pressure (VP), but merely to determine the effect of occlusion of these vessels on the intraocular pressure. In others, venous pressure and intraocular pressure were measured, but not simultaneously; thus Seidel measured IOP tonometrically before and after his determinations of venous pressure, in which he used the occlusion techniques. He assumed that the procedure of measuring venous pressure had no effect on the IOP at the moment when these pressure measurements were made, since the eye appeared normal after the procedure and the IOP was unchanged.
MACRI FJ. Interdependence of Venous and Eye Pressure. Arch Ophthalmol. 1961;65(3):442-449. doi:10.1001/archopht.1961.01840020444021