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Article
November 1941

TONOMETRIC STANDARDIZATION: A METHOD OF INCREASING THE ACCURACY OF TONOMETRY

Author Affiliations

SAN FRANCISCO
From the Division of Ophthalmology, Department of Surgery, University of California Medical School.

Arch Ophthalmol. 1941;26(5):859-885. doi:10.1001/archopht.1941.00870170151012
Abstract

There are two ways whereby the intraocular pressure may be measured : manometry and tonometry. Of the two the former alone attains any degree of scientific accuracy.

Manometry, however, being a clinically inapplicable method, suitable only for the laboratory, it has been necessary to devise an instrument for estimating the intraocular pressure by interpretation of measurements taken of the impressibility of the globe. This is the method of impression tonometry.

It cannot be too strongly emphasized that the tonometer is not an instrument of accuracy in recording an absolute measure of the intraocular pressure. The tension of an eye is in part due to the pressure of its contents, but it is not identical with this pressure nor does it vary absolutely with it. Actually it is the impressibility of the eyeball which is measured by the tonometer. From this measure is deduced the tension of the eye, and the absolute

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