THE PURPOSE of this preliminary report is to describe a manner of utilizing the Schiøtz tonometer to obtain a measure of the patency of the channels of aqueous humor outflow and of the steady state net rate of aqueous humor flow. It is believed that the method described here provides a means of discerning in what measure changes in intraocular pressure are due to change in facility of outflow or to change in net rate of aqueous humor formation. A subsequent report will describe the alterations in these factors which are effected in normal and in glaucomatous eyes by various medical and surgical influences.
The electronic Schiøtz tonometer is electrically connected to an amplifier and recording galvanometer in such a manner that all measurements made by the tonometer are continuously and automatically recorded on a moving paper strip, such as is employed in electrocardiography. The apparatus is pictured in figure
GRANT WM. TONOGRAPHIC METHOD FOR MEASURING THE FACILITY AND RATE OF AQUEOUS FLOW IN HUMAN EYES. Arch Ophthalmol. 1950;44(2):204-214. doi:10.1001/archopht.1950.00910020209003