Abstract

SA.01.07

Evaluation of IOP measuring quality of the newly configured self-tonometer Ocuton S* compared to the former Ocuton S and the Goldmann tonometer

Clemens Jürgens, Elena Lanfermann, Rico Großjohann, Susanna Antal, Frank Tost
Universitäts-Augenklinik Greifswald

Objective
The newly configured self-tonometer Ocuton S* automatically analyses the corneal shape on the measuring prism. As a result the patient is no longer responsible to control the shape himself. To evaluate the measuring quality of the newly configured Ocuton S*, we compared IOP-values derived from the new Ocuton S*, the former Ocuton S and the Goldmann tonometer (GAT).
Methods
101 glaucoma patients performed self-measurements using the old Ocuton S (four measurements per eye) and the new Ocuton S* (four measurements per eye). In addition two measurements per eye of each patient were taken with the GAT as a reference. The three series of measurements were performed in random order.
Results
The mean IOP measured with the old Ocuton S was 18.3 ± 4.2 mmHg and 17.5 ± 3.6 mmHg with the new Ocuton S*. The mean IOP measured with GAT was 15.1 ± 3.4 mmHg. The mean difference between the old Ocuton S and GAT was 3.2 ± 3.5 mmHg, between the new Ocuton S* and GAT 2.4 ± 3.3 mmHg and between old and new Ocuton S 0.9 ± 2.9 mmHg (p<0.01).
Conclusions
The newly configured Ocuton S* leads to a significant improvement in the measuring accuracy compared to the former Ocuton S. The automatic analysis of the coneal shape increases the usability of the self-tonometer.

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