Non-contact tonometer accuracy test calibration module

Abstract

The invention relates to a non-contact tonometer accuracy testing and calibrating module which comprises a simulated human eye. A hard flat plate of a metal frame is arranged at the rear of the simulated human eye, and a simulated sclera is fixedly connected with the hard flat plate; a liquid channel for simulating circulation of aqueous humor is arranged inside the metal frame, and a first valve is arranged at a liquid inlet in the top of the liquid channel; a liquid through hole and a sensor interface leading-in hole are respectively formed in the hard flat plate; the simulated human eye is communicated with a pressure sensor via the sensor interface leading-in hole, and the sensor interface leading-in hole is used for detecting the internal pressures of the simulated human eye; a piston liquid cylinder is transversely arranged on the lower portion of the metal frame, the simulated human eye is communicated with the piston liquid cylinder via the liquid through hole, a piston lead screw is arranged in the piston liquid cylinder, and a second valve is arranged at the front end of the piston liquid cylinder; aqueous humor of the simulated human eye can be injected from a liquid inlet of the first valve, and the piston lead screw can be operated to fittingly gradually backwardly move; after the aqueous humor of the simulated human eye is completely injected, the piston lead screw can be operated to forwardly move until requirements on simulated intraocular pressures are met by the pressure sensor, and the second valve can be closed.

Description

technical field [0001] The invention relates to a non-contact tonometer accuracy inspection and calibration module, which belongs to the technical field of non-contact tonometer accuracy inspection and calibration. Background technique [0002] Intraocular pressure is the pressure inside the eyeball, and its main function is to maintain the normal shape and physiology of the eyeball. Intraocular pressure outside the normal range is likely to be a symptom of many eye diseases such as retinal detachment, eyeball rupture, endophthalmitis, or eyeball atrophy. Therefore, the measurement of intraocular pressure is of great significance to the clinical diagnosis of ophthalmic diseases, especially glaucoma. [0003] The tonometer is a special measuring instrument for quantitatively measuring intraocular pressure, and it has been included in the detailed catalog of working measuring instruments for compulsory verification by the People's Republic of China. There are two main types ...

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Problems solved by technology

But this device has two obvious deficiencies. One is that the aqueous humor medium that simulates the human eye is filled with air instead of the real intraocular pressure, which leads to the essential difference between compressible fluid and incompressible fluid, because the same corneal deformation The aqueous humor medium makes the cornea more difficult to deform, that is, the intraocular pressure value measured by the simulated human eye of the air medium will be lower to a certain extent than that of the aqueous humor medium, and it is different from the actual use of the non-contact tonometer. The situation (for human eye detection) has a certain degree of deviation, resulting in the calibration point data when using the simulated human eye device to calibrate, which cannot be corrected by the actual application situation; the second is the internal cavity volume of the simulated human eye device and the real eyeball aqueous humor The difference in volume is large, because the real intraocular pressure is mainly caused by the aqueous humor in the anterior chamber and posterior chamber, which is only about 0.3ml in total, which is about the range from the corneal cavity to the maximum diameter of the anterior chamber

However, the intraocular pressure cavity of the human eye simulation device still has several times the space of the corneal cavity after the bionic cornea, which will cause the volume change rate of the entire intraocular pressure cavity to decrease greatly when the diameter of the cornea center is 3.6 mm. Cause the measured intraocular pressure value will be too small

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