Photono Oy

Tiolat Oy

Icare Finland Oy

Injeq Oy

Antti Kontiola

Ari Salmi

Heikki Juhani Nieminen

Edward Haeggström

Edward Häggström

Timo Rauhala

Edward Hæggström

Ivan Kassamakov

Jari Hyttinen

Kai Kronström

Petri Ahonen

Kalle Hanhijärvi

Risto Montonen

Katja Paassilta

A system for detecting a wave occurring in/on a membrane includes a source for directing an excitation signal obliquely to the membrane and a receiver for measuring interference between a first part of the excitation signal reflected off a front surface of the membrane and a second part of the excitation signal reflected off a rear surface of the membrane. The system includes a processing device for detecting the wave based on a change in the measured interference. The detection of the wave is based on changes caused by the wave in the optical length of a V-shaped part of a propagation path of the second part of the excitation signal, where the V-shaped part of the propagation path is inside the membrane.

System and method for detecting a wave occurring in/on a membrane

An intraocular pressure measurement arrangement is disclosed for measuring pressure of an eye of a patient. The arrangement can include at least one source for producing mechanical waves of several frequencies from a distance to the eye of the patient to generate at least one surface wave to the eye, a detector for detecting at least one surface wave from a distance from the eye to extract surface wave information, and a device for determining pressure information of the eye based on the surface wave information.

Method and arrangement for eye pressure measurements

An intraocular pressure measurement arrangement is disclosed for measuring pressure of an eye of a patient. The arrangement can detect at least one of acoustic reflectivity, optical reflectivity, optical path difference, positioning of intraocular pressure measurement arrangement with respect to the eye, orientation of intraocular pressure measurement arrangement with respect to the eye, shape of cornea and corneal thickness. At least one source can produce acoustic, nonlinear acoustic, mechanical or a nonlinear mechanical wave from a distance, coupling to the eye to generate at least one surface wave. Upon triggering data acquisition, at least one surface wave from a distance from the eye can be detected to extract surface wave information with pressure information of the eye being based on the surface wave information.

Method and arrangement for eye measurements

A method is disclosed for measuring pressure under a flexible cover by utilizing electromagnetic waves. Laser radiation is directed to the cover from a distance to generate vibration or a mechanical wave at the cover at at least one generation location of the cover on the basis of photoacoustic phenomena. Based on the electromagnetic waves, cover vibrations are detected due to the mechanical wave, and recorded to detect the mechanical wave at at least one recording location and to form mechanical wave information. Pressure information of pressure under the flexible cover is detected based on at least one recorded signal.

Measurement method and arrangement utilizing electromagnetic waves

The arrangement in a tonometer has a probe that is brought into contact with the surface of the eye and the intraocular pressure in the eye is derived from the variations in the velocity of the probe. The probe is formed of a piece of a non-magnetic substance. The arrangement includes a holder located in the tubular component and attached to a shaft providing the force for the measurement, in which holder there is a guiding means for guiding a movement of the probe along an internal surface of the tubular component.

Arrangement in a tonometer

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Helsinki, Finland

Antti Kontiola