[Notes on clinical criteria for the evaluation of tonometers (author's transl)]

The limits of error existing hitherto in verifying the measuring force of applanation tonometers are to be extended in the IOP range above 4.0 kPa (10 mmHg). Relevant ISO proposals submitted by Japan and the Federal Republic of Germany are under discussion. The increase in the amplitudes of pulsations in the eye with increasing intraocular pressure i.e., about 10% per 1.33 kPa (10 mmHg), necessitates a restatement of the limits of error for deviations of individual values around the regression line in clinical control measurements with tonometers whose measuring process terminates in split seconds. Equations for parabolic limits of error are given.