Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"

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Non Contact Measurement of Intraocular Pressure Using Ultrasonic Excitation an Interferometric Measurement of Vibrations of the Eye

Hey S., Eix I., Stork W.
Universität Karlsruhe, Institut für Technik der Informationsverarbeitung, Karlsruhe

Purpose: The measurement of intraocular pressure is one of the common ophthalmologic examination. The present methods for measuring the intraocular pressure have some disadvantages. The use of applanation tonometers requires a local anaesthetic, non-contact tonometers with air pulse are often described as unpleasant. For both methods there is a certain risk of infection. These disadvantages of the established devices could be overcomed by a new method without contact and stress for the patient.
Method: The intraocular pressure can be determined by measuring the oscillating behaviour of the elastic shell of the eye. The vibrations with an amplitude in the sub micron range are measured with an laserinterferometric vibrometer. The excitation of the eye is realised with amplitude-modulated air-borne ultrasound.
Results: A system to measure small vibrations of the cornea is introduced. Vibrations are induced by a specially developed ultrasonic system. The correlation between acoustic properties of the eye and the intraocular pressure is determined in extensive studies with several probands. The basic assumptions of the principle could be confirmed by the results.
Conclusions: The determination of intraocular pressure by measuring the vibration characteristics of the eye provides new opportunities in diagnosis of

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