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Article
May 1957

Modification of the Friedenwald-Kinsey Formula of Intraocular Pressure

AMA Arch Ophthalmol. 1957;57(5):687-688. doi:10.1001/archopht.1957.00930050699008
Abstract

The formula of the intraocular pressure proposed by Friedenwald and Kinsey is the following: IOP=k(Cap P+OPAq—OPp1) where

The values kin and kout are the effectiveness with which the osmotic and hydrostatic forces are converted into intraocular pressure.1 The pressure of the episcleral veins has to be considered in outflow only, but not in expressing the intraocular pressure itself.2

It seems that the effectiveness with which the osmotic and hydrostatic forces are converted into intraocular pressure is based upon their influence on inflow and outflow. The formula of the intraocular pressure can be regarded as derived from an equation of inflow and outflow, where kin and kout are coefficients of flow. The terms kin and kout are the volumes of water transferred within one minute by a pressure of 1 mm. Hg through the blood-aqueous barrier or through

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