Contact tonometer

Abstract

The invention relates to a contact applanation tonometer. The contact tonometer comprises a probe, a light source, a first image sensor, a convex lens, a strain gauge, a microprocessor and a display memory. The probe is in a circular truncated cone shape with small bottom and large top, and is made from a transparent optical material; an inclined plane is arranged at the lateral surface of the probe; the width d of the inclined plane is 3-10 millimeters; an elastic beam is fixedly installed at the upper end of the probe; the external end of the elastic beam is fixedly connected with the lower end of a housing; the strain gauge is installed on the elastic beam; the light beams emitted by the light source are perpendicularly incident to the upper end of the probe after being collimated to be parallel beams by the convex lens; and after sequentially going through the total reflection on the lateral surface and the lower bottom surface of the probe, and the reflection on the inclined plane of the probe, the light beams directly enter the first image sensor. The contact tonometer can continuously and dynamically detect multiple intraocular tension values during measurement of the intraocular tension.

Description

technical field [0001] The invention relates to an intraocular pressure measuring device, in particular to a contact-type applanation intraocular pressure measuring instrument. Background technique [0002] Intraocular pressure is the pressure per unit volume of the eyeball wall (aqueous humor, lens, vitreous body, blood) acting on the eyeball wall. Long-term elevated intraocular pressure will lead to optic nerve ischemia, lower tolerance at the same intraocular pressure level, and cause neurodegeneration. Irreversible visual field defect. In ophthalmology, it is a common examination to determine the intraocular pressure of a patient's eye. It is used in particular for the (early) diagnosis and monitoring of glaucoma disease. Various methods and corresponding devices are known for determining intraocular pressure. For example, there is an implantable approach where a suitable pressure sensor is inserted directly into the eye. Although the implantable type can directly m...

AI Technical Summary

Problems solved by technology

Chinese patent CN 202161301U discloses an applanation tonometer, but this tonometer is a Goldman-type tonometer. When using this method for measurement, it can only measure the intraocular pressure of a specific applanation area, that is, only When the intraocular pressure is measured once, when the measurer is not skilled and the measuring device shakes, or the subject shakes due to nervousness, it may cause errors in the measurement results

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