Hi, my name is Peter Dekker, im working as an ophthalmologyst in Switzerland

Together with Professor Yves Robert, University-Eye-Clinic in Zurich, we are developping a new Device to measure the Intraocular pressure continuously during examination of the fundus.

SMARTLENS

NEWEST INFORMATIONS: www.odc.ch

Fig.1: The  prototype. The size is about the same as the Goldmann-3-Mirror-Lens

Fig. 2.: Functional Diagramm

Fig.3.: Correlation between Contact-Lens-Tonometer and direct measured IOP (Statham)

Abstract:

It is a tonometer built into a contactlens, which allows to measure the eye-pressure and to perform ophthalmoscopy at the same time. Artificially induced changes of the eye-pressure and their influence on the visible fundus can now be checked simultanously.

The contact-lens-tonometer (CGT) also is able to record continuously the pulse-curve, which can indicate any circulatory problem. So, the device is expected to give us additional diagnostic criteria of early glaucoma. Each ophthalmologyst in the field will be able to preform with this device a oculodynamometry in an easy way. By this it is possible to estimate the pressure-tolerance of the optic disk from glaucoma-patients.

We have taken some measurements on enucleated human eyes, comparing our device with a Statham-transducer in the vitreous. We found a good correlation. In a second step, we made measurements (65) on healthy volunteers, comparing the device with Perkins-Tonometry:

We found a correlation (R=0.58). The error of the measurements was about +/- 3 mmHg. Considering both, the deviation of the Perkins-Tonometer with which our results were compared, and the fact of a good correlation (R=0.999) in the study with the enucleated human eyes, we found that the contact-lens-tonometer measures the intraocular pressure exactly.

In future studies, we want to analyze the dynamic component of the measurements.

Further Information:     www.odc.ch

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