A non-contacting tonometer

A - Human Necessities – 61 – B

Patent

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A61B 3/16 (2006.01)

Patent

CA 2479493

Apparatus and method for measuring Internal Ocular Pressure (IOP) comprises applying a perturbing vibration into an eye over a range of frequencies. A vibrational response of the surface of the eye is measured such as by using a laser velocimeter, the vibrational response including velocity and rate of change of the phase lag. Further, geometric properties such as volume of the eye are measured such as by using a laser interferometer to measure characteristics such as the eye's axial length and cornea thickness. Use of multiple characteristics normalizes the effect of an eye's mechanical and geometric properties and thereby more accurately determines the IOP.

La présente invention concerne un appareil et un procédé destinés à mesurer la pression intraoculaire (PIO), procédé selon lequel on applique une vibration perturbatrice (2) à un oeil (1) sur une gamme de fréquences. On mesure une réponse vibrationnelle de la surface de l'oeil au moyen d'un vélocimètre à laser (6) par exemple, ladite réponse incluant la vitesse et le taux de variation du déphasage. On mesure en outre des propriétés géométriques telles que le volume de l'oeil au moyen d'un interféromètre à laser (13) afin de mesurer des caractéristiques telles que la longueur axiale de l'oeil et l'épaisseur de la cornée. L'utilisation de caractéristiques multiples permet de normaliser l'effet des propriétés mécaniques et géométriques d'un oeil et, par conséquent, de mesurer la PIO avec une plus grande précision.

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