Intraocular Pressure and Blood Flow Through the Uvea

Abstract

There is evidence for interrelationships between uveal blood flow, aqueous formation, intraocular pressure, and venous pressure counteracting aqueous drainage. It can therefore be expected that the relationship between intraocular pressure and blood flow through the uvea should be complicated. The purpose of the present investigation was to study part of the latter relationship, namely, the changes in uveal blood flow produced by changes in intraocular pressure. This problem was studied earlier by Sondermann,³⁰and other investigators have reported about the influence of the intraocular pressure on the blood flow through the choroid. The findings were rather conflicting. Sondermann,³⁰working with rabbits, found no constant relationship between the intraocular pressure and the flow from an opened vortex vein but reported that as a rule an increase in intraocular pressure gave a decrease in blood flow. Bornschein and Zwieauer,¹²using a dye injection technique in rabbits, found evidence for