Optical remote continuous sensing of intraocular pressure variations

We present the first steps of a new measurement principle for high-precision non-contact remote and continuous monitoring of intra-ocular pressure. A photonic device involving a fast camera and a laser is presented and tested in rabbit's eyes for continuous remote monitoring of the intra-ocular pressure. The device is based on tracking the secondary speckle patterns trajectories produced by reflection of an illuminating laser beam from the iris or the sclera. The rabbit's eyes were stimulated with increasing and decreasing ramps of intra-ocular pressure. Data from the photonic device were correlated with the induced intra-ocular pressure as consequence of the infusion bag elevation variations. The measurements show a good correlation and sensitivity of the proposed device with intra-ocular pressure changes while providing a high precision measurement (5% estimated error) for the best experimental configuration.

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