An increased intraocular pressure (IOP) is the most important risk factor for glaucoma. For purposes of diagnostics and monitoring of the disease, ophthalmologists usually measure and follow-up on the development of IOP by applying tonometry. As the pressure varies in the course of the day, a reliable measurement requires recording a circadian pressure profile. As yet, this can only be done in a hospital.
The Bremen Institute for Metrology, Automation and Quality Science(BIMAQ) of the University of Bremen developed a noncontact tonometer to measure the IOP reliably and with high precision, which does not injure the cornea. Patients can even carry out the measurement themselves, by using the self-tonometer SelTon. To this end, the appliance is positioned like an airtight measurement chamber around the eye, to which it emits a pressure wave (see Figure). This results in a brief deformation of the eyeball, the manifestation of which permits the determination of the IOP.
The measurement technique has already been explored in great detail and analyzed in comprehensive tests on porcine and human eyes. The fundamental suitability of the measurement method for patients has thus been confirmed.
Intraarticular pressure, self-measurement, glaucoma diagnosis
DE 10 2006 033 035 B4
University of Bremen, BIMAQ