[Leydhecker tonography and Ulrich ocular pressure tonometry in probands with healthy eyes and glaucoma patients].

In the study presented here, we compared two methods of measuring the ocular drainage resistance in patients with primary open angle glaucoma and in healthy subjects: (1) 7-min tonography according to Leydhecker; (2) oculopression tonometry according to Ulrich. We examined 30 healthy subjects and 30 patients suffering from glaucoma. Seven-minute tonography according to Leydhecker and the oculopression tonometry according to Ulrich (OPT) were both performed in these two groups. By means of OPT, we determined the discrimination function D1, i.e. the difference between the intraocular pressure (IOP) before starting the test and the IOP after removing the cup. Using these function results, it was possible to differentiate sufficiently between healthy and glaucomatous eyes. Fifty-Five eyes (92%; 60 people examined) were correctly diagnosed, 3% were classified as false negative; 5% (3) as false positive. In comparison, tonography according to Leydhecker showed 10% (6) false negative and no false-positive cases. The results presented here did not show any significant differences between the two methods used. Therefore both methods are considered to be of equal value in clinical use.