Measuring head and non-contact tonometer calibrating device and method

Abstract

The invention discloses a measuring head and a non-contact tonometer calibrating device and method. The measuring head comprises a shell substrate, and an air inlet, a light guide column, a pressure sensor, a light-emitting device and a reflector which are arranged on the shell substrate; an air path is arranged in the air inlet and connected with the pressure sensor in a sealed mode, and the pressure sensor is used for detecting an air pressure signal of airflow sprayed by the non-contact tonometer; the light guide column is installed in the center of the air inlet and used for guiding light,and the curvature radius of the front end surface of the light guide column is matched with the curvature radius of the front surface of a real human cornea; the light-emitting device is installed onthe inner side of the light guide column and connected with the light guide column in the air inlet direction, light beams emitted by the light-emitting device are conducted out through the light guide column and received by the tonometer, and the light beam emitting time is related to the numerical value of an air pressure signal; and the reflector is arranged on the side edge of the air inlet and used for assisting in adjusting the angle of the measuring head. Good consistency of performance of the calibrating device is guaranteed, and long-term stability and accuracy of the calibrating device are improved.

Description

technical field [0001] The embodiments of the present disclosure relate to medical technology, in particular to a measuring head, a non-contact tonometer verification device and method. Background technique [0002] Intraocular pressure, also known as intraocular pressure, is the balanced pressure exerted by the contents of the eyeball on the inner wall of the eyeball. The intraocular pressure of normal people is stable within a certain range to maintain the normal shape of the eyeball and maintain a good refractive state at the interface of each refractive medium. The intraocular pressure range of most people is usually 10-21mmHg. If the intraocular pressure is too high for a long time, it will cause damage to the optic nerve and cause glaucoma; if the intraocular pressure is too low for a long time, it will also cause damage to eyeball tissue and function, and even lead to eyeball atrophy and blindness. Therefore, intraocular pressure measurement is one of the important m...

AI Technical Summary

Problems solved by technology

[0004] Because it involves the health and safety of human eyes, it is necessary to use a verification device for routine verification of non-contact tonometers. Currently known verification devices generally use rubber simulation eyes to simulate actual human eyes. In order to realize the simulation of different intraocular pressure values, rubber The internal pressure of the simulated eye can be adjusted, but the pressure will lead to volume changes. Since only the front surface of the rubber simulated eye is a non-rigid material, the effect is that the surface curvature radius and surface thickness of the rubber simulated eye will change with the internal pressure. There is a change, beyond the range of the radius of curvature of the normal human cornea, causing it to be inconsistent with the radius of curvature of the front surface of the real human cornea

In addition, after repeated measurements or a period of use, due to the impact of the airflow, the simulated intraocular pressure value gradually decreases, and the value cannot be stabilized

Moreover, the performance of the rubber simulated eye is only calibrated by the pressure sensor inside the cavity, but the internal pressure of the simulated eye cavity does not represent the intraocular pressure, resulting in a significant difference between the displayed pressure in the cavity and the measured value of the tonometer

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