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A non-contact tear film breakup time measuring device and method

A burst time, non-contact technology, applied in the fields of eye testing equipment, medical science, diagnosis, etc., can solve the problems of poor consistency and repeatability of measurement results, discomfort of the examinee, and poor objectivity of measurement results, etc., to achieve measurement The results are objective and accurate, with good repeatability and the effect of reducing discomfort

Inactive Publication Date: 2016-02-10
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This measurement method has the following three deficiencies: (1) after sodium fluorescein is injected into the tear film, it affects the stability of the tear film, causing the tear film to be different from the tear film in the natural state, and the concentration of the dripped sodium fluorescein Different degrees of tear film stability will affect the tear film stability, making the measurement results less objective; (2) The doctor uses a stopwatch to time the measurement, and the results obtained by different doctors will be slightly different. poor consistency and repeatability; (3) invasive diagnosis can easily bring discomfort to the examinee

Method used

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  • A non-contact tear film breakup time measuring device and method
  • A non-contact tear film breakup time measuring device and method
  • A non-contact tear film breakup time measuring device and method

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Embodiment 1

[0037] Combine the following Figure 1-6 This embodiment will be described.

[0038] Such as figure 1As shown, the device of the present invention is provided with a structured light projection unit 1, a first beam splitter 2, a center positioning unit 3, a second beam splitter 4, a focusing unit 5, an imaging unit 6, a housing 7, a base 8, a three-dimensional movement Taiwan 9, motion controller and host computer. The three-dimensional motion table 9 is arranged on the base 8, the housing 7 is arranged on the three-dimensional motion table 9, and the motion controller is connected with the three-dimensional motion table 9 and the upper computer. A detection window is provided on the side of the casing 7, and a chin rest 81 is provided on the base 8 to support the head of the person to be detected. The structured light projection unit 1, the first beamsplitter 2, and the second beamsplitter 4 are sequentially placed at intervals along the horizontal direction, and the secon...

Embodiment 2

[0044] Combine the following Figure 7 , Figure 8 Describe this embodiment

[0045] Such as Figure 7 As shown, the main technical features of the present invention are the same as those of Embodiment 1, except for the following four parts: lighting unit 11 , beam modulator 13 , centrally positioned light source 31 , and focusing light source 51 . In this embodiment, the illumination unit 11 includes an illumination source 111 and a beam expander 112. The illumination source 111 is a near-infrared laser with an emission wavelength of 808 nm. After the laser beam is expanded by the beam expander 112, it passes through the first polarizer 12. It becomes linearly polarized light and provides background illumination for the beam modulator 13 . The beam modulator 13 is a programmable spatial light modulator, which can control the liquid crystal orientation of each liquid crystal pixel through programming, so as to control whether light can pass through the liquid crystal pixel ...

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Abstract

The invention relates to a noncontact-type tear film breakup time measuring device and method. The noncontact-type tear film breakup time measuring device comprises a structured light projection unit, a first light splitter, a central positioning unit, a second light splitter, a focusing unit, an imaging unit, a shell, a base and a three-dimensional moving platform, the structured light projection unit projects structured light patterns of a certain mode to the surface of a tear film, structured light images modulated by the surface of the tear film are collected by the imaging unit, and whether the structured light patterns in the collected images are distorted or broken or not is detected through upper computer software so as to judge thinning and breaking conditions of the tear film. Tear film breakup time is measured by adopting a method of structured light detection, so that stability of the tear film is unaffected due to a noncontact measuring mode; the device can automatically recognize starting point and finishing point of tear film breakup time measuring to automatically complete the whole measuring process, thereby being objective and accurate in measuring result.

Description

technical field [0001] The invention relates to a medical optical measuring device and a measuring method, in particular to a non-contact tear film breakup time measuring device and method. Background technique [0002] The surface of the normal human eye is covered by a layer of tear film. A stable tear film can maintain the health of the ocular surface, keep the ocular surface moist, and improve the refractive system of the eye. The tear film is the outermost barrier of the human eye and an important part of the ocular surface immune defense system. The instability of the tear film will destroy the integrity of the tear film barrier, and bacterial toxins and antigenic substances are easy to directly contact with the corneal epithelium , leading to immunopathological reactions and damage to the cornea. The human eye coats tears on the surface of the eyeball to form a tear film through the blinking action. After the tear film is formed, it begins to evaporate, resulting in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/15
Inventor 张陈涛张建寰颜黄苹刘婷婷陶金
Owner XIAMEN UNIV
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