Medical goggle lens and method of designing the same

Abstract

The application discloses a medical goggle lens and a design method thereof, and belongs to the field of goggle lenses. According to the corresponding curves x(lambda), y(lambda) and z(lambda) of three cone cells of a human eye to a visible spectrum, three stimulus values are obtained by using a standard observer response function, the three stimulus values are normalized, the chroma is less than 0.1, the value range of x, y and z is 0.32-0.34, the laser wavelength to be cut off is obtained, the transmittance of other wavelengths is adjusted, corresponding x, y and z design values are obtained, the film system of an optical film is designed according to the x, y and z design values, and the corresponding film system is obtained. Through the above steps, the laser wavelength used in surgery is cut off in a specific wavelength range, the radiation of laser light is prevented from causing harm to the human eye, the transmittance is high, the chromatic aberration is small, the color of the film layer is close to colorless, and the color of the protective lens is reduced to interfere with medical staff.

Description

Technical Field

[0001] This invention relates to the field of optical fibers, and in particular to a medical protective lens and its design method. Background Technology

[0002] Protective eyeglass lenses are a type of filter lens. Their main function in application is to block certain wavelengths of light, thereby preventing radiation from damaging the eyes, while allowing other wavelengths of light to pass through, thus increasing the light transmittance of the lens.

[0003] Currently, protective goggles are mainly divided into two categories: absorptive and reflective. Absorptive lenses, while blocking light of the corresponding wavelength of radiation, also absorb other wavelengths of visible light, thus reducing visibility. Reflective lenses, on the other hand, only block the intensity of light of their corresponding wavelength of radiation, allowing other wavelengths of light to pass through. This results in light appearing with a certain color after passing through the lens, meaning the color displayed is the color of the transmitted light. Due to this color difference, it can easily lead to visual errors for medical personnel, affecting their working performance. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a design method for medical protective lenses with high transmittance, small color difference, and transmittance light color close to white light.

[0005] In order to overcome the shortcomings of the prior art, the second objective of this invention is to provide a medical protective lens with high transmittance, small color difference, and transmittance light color close to white light.

[0006] One of the objectives of this invention is achieved through the following technical solution:

[0007] A method for designing medical protective lenses includes the following steps:

[0008] Based on the response curves x(λ), y(λ), and z(λ) of the three cone cells in the human eye to the visible spectrum, the standard observer response functions for the three stimulus values ​​are obtained. The formulas for the response functions for the three stimulus values ​​are as follows:

[0009]

[0010] Where S(λ) is the spectrum of natural light after passing through the goggles; x(λ) is the response curve of the red cone cells of the simulated human eye to the visible spectrum; y(λ) is the response curve of the green cone cells of the simulated human eye to the visible spectrum; z(λ) is the response curve of the blue cone cells of the simulated human eye to the visible spectrum; X is the stimulus value of red obtained using the standard observer response function; Y is the stimulus value of green obtained using the standard observer response function; and Z is the stimulus value of blue obtained using the standard observer response function.

[0011] Normalizing the three stimulus values ​​yields:

[0012]

[0013]

[0014] x is the color coordinate corresponding to red in colorimetry, y is the color coordinate corresponding to green in colorimetry, and z is the color coordinate corresponding to blue in colorimetry. The chromaticity is set to be less than 0.1, so the values ​​of x, y, and z are in the range of 0.32-0.34. The laser wavelength that needs to be cut off is obtained, and the transmittance of other wavelengths is adjusted to obtain the corresponding x, y, and z design values.

[0015] Based on the design values ​​of x, y, and z, the film system of the optical thin film is designed to obtain the corresponding film system;

[0016] Based on the designed membrane system, the actual values ​​of x, y, and z, as well as the final chromaticity value, are obtained.

[0017] Furthermore, the laser wavelength that needs to be cut off is 525-545nm.

[0018] Furthermore, the film system is a film system formed by alternating stacking of multiple high-refractive-index film layers H and low-refractive-index film layers L.

[0019] Furthermore, the high refractive index film material includes at least one of Ta2O5, Nb2O5, and TiO2.

[0020] Furthermore, the low-refractive-index film material includes at least one of SiO2, Al2O3, and MgF2.

[0021] The second objective of this invention is achieved by the following technical solution:

[0022] A medical protective lens, manufactured using any of the above-mentioned medical protective lens design methods, the medical protective lens includes a substrate, the substrate having a film system formed by alternating stacks of multiple high refractive index film layers H and low refractive index film layers L.

[0023] Furthermore, the substrate is made of silicon dioxide material.

[0024] Furthermore, the high refractive index film material includes at least one of Ta2O5, Nb2O5, and TiO2.

[0025] Furthermore, the low-refractive-index film material includes at least one of SiO2, Al2O3, and MgF2.

[0026] Compared to existing technologies, the medical goggle lens design method of this invention obtains three stimulus values ​​based on the corresponding curves x(λ), y(λ), and z(λ) of the three cone cells of the human eye to the visible spectrum. These three stimulus values ​​are then normalized using a standard observer response function, with a chromaticity set to be less than 0.1. Therefore, the range of x, y, and z values ​​is 0.32-0.34. The laser wavelength that needs to be cut off is then obtained, and the transmittance of other wavelengths is adjusted to obtain the corresponding x, y, and z design values. Based on these x, y, and z design values, an optical thin film system is designed to obtain the corresponding film system. Through these steps, a cutoff is achieved within a specific wavelength range, preventing damage to the human eye from laser radiation. The system also features high transmittance, low chromatic aberration, and a near-colorless film, reducing interference from the color of the protective goggle lens on medical personnel. Attached Figure Description

[0027] Figure 1 This is a standard three-primary-color chromatogram.

[0028] Figure 2 A schematic diagram comparing a standard three-primary-color chromatogram with a negative filter for a 532nm laser wavelength;

[0029] Figure 3 The transmitted three primary color spectrum of a negative filter with a laser wavelength of 532nm;

[0030] Figure 4 This is a schematic diagram comparing a standard three-primary-color chromatogram with a colorless filter using a 532nm laser wavelength;

[0031] Figure 5 The transmitted three primary color spectrum of a colorless lens with a laser wavelength of 532nm;

[0032] Figure 6 This is a schematic diagram comparing the target curve of the colorless lens with the actual sample using a 532nm laser wavelength. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figure 1 The present invention discloses a method for designing medical protective lenses, comprising the following steps:

[0036] Based on the response curves x(λ), y(λ), and z(λ) of the three cone cells in the human eye to the visible spectrum, the standard observer response functions for the three stimulus values ​​are obtained. The formulas for the response functions for the three stimulus values ​​are as follows:

[0037]

[0038] Where S(λ) represents the power spectrum of a certain color of light, which can be considered as the spectrum of natural light after passing through the goggles; x(λ) is the response curve of the red cone cells of the human eye to the visible spectrum; y(λ) is the response curve of the green cone cells of the human eye to the visible spectrum; z(λ) is the response curve of the blue cone cells of the human eye to the visible spectrum; X is the stimulus value of red obtained using the standard observer response function; Y is the stimulus value of green obtained using the standard observer response function; Z is the stimulus value of blue obtained using the standard observer response function.

[0039] Normalizing the three stimulus values ​​yields:

[0040]

[0041] x is the color coordinate corresponding to red in colorimetry, y is the color coordinate corresponding to green in colorimetry, and z is the color coordinate corresponding to blue in colorimetry. The chromaticity is set to be less than 0.1, so the values ​​of x, y, and z are in the range of 0.32-0.34. The laser wavelength that needs to be cut off is obtained, and the transmittance of other wavelengths is adjusted to obtain the corresponding x, y, and z design values.

[0042] Based on the design values ​​of x, y, and z, the film system of the optical thin film is designed to obtain the corresponding film system;

[0043] Based on the designed membrane system, the actual values ​​of x, y, and z, as well as the final chromaticity value, are obtained.

[0044] Specifically, the corresponding curves x(λ), y(λ), and z(λ) of the three cone cells for the visible spectrum are as follows: Figure 1 As shown.

[0045] The required laser wavelength for cutoff is 525-545 nm. The film system is composed of multiple alternating layers of high-refractive-index films (H) and low-refractive-index films (L). The high-refractive-index film material includes at least one of Ta₂O₅, Nb₂O₅, and TiO₂. The low-refractive-index film material includes at least one of SiO₂, Al₂O₃, and MgF₂.

[0046] The specific design process for 532nm lasers is as follows:

[0047] The laser wavelength range of 525-545nm is selected for cutoff, while other wavelengths are allowed to pass through, such as... Figure 2 , Figure 2 The target is a negative filter used as the spectrum of the goggles. The tristimulus color spectrum of the lens's transmission spectrum is obtained, such as... Figure 3 Based on the tristimulus color spectrum, x = 0.34686, y = 0.289333, and z = 1 - xy = 0.363807 were calculated. By adjusting the transmittance of other wavelengths to make the values ​​of x and y close to 0.33, a comparison chart of the transmittance spectrum of the standard tristimulus contrast lens was obtained, as shown below. Figure 4 , Figure 4 The curves when the target values ​​for x, y, and z are all 0.33; and the transmittance spectrum of the lens, such as... Figure 5 The corresponding values ​​x = 0.338719, y = 0.323657, and z = 0.337624 were obtained. The film system was then optimized using the obtained target spectral curves, resulting in the corresponding film system, as shown in Table 1. Ta₂O₅ and SiO₂ were used as the high and low refractive index materials in the processing technology. Ta₂O₅ has a refractive index of 2.22861 near 550 nm, while SiO₂ has a refractive index of 1.47464 near 550 nm.

[0048] Table 1

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057] Based on the designed membrane system, x = 0.337391, y = 0.324086, z = 0.338523 were obtained, and the final colorimetric value was 0.07.

[0058] The medical protective eyewear lens provided in this embodiment for 532nm lasers achieves 532nm laser wavelength channel cutoff, with a chromaticity <0.1, resulting in a colorless lens. It employs a hard dielectric coating deposited by sputtering or ion beam assisted deposition and meets reliability requirements for abrasion resistance, high temperature and humidity resistance. Its performance is described in [link to performance details]. Figure 6 Performance diagram.

[0059] This application also discloses a medical protective lens, manufactured using the aforementioned medical protective lens design method. The medical protective lens includes a substrate, on which a film system consisting of multiple layers of alternating high-refractive-index films H and low-refractive-index films L is formed. The substrate is made of silicon dioxide material, such as D263T, BK7, FS, or other glass materials with high visible light transmittance.

[0060] High refractive index film materials include at least one of Ta2O5, Nb2O5, and TiO2. Low refractive index film materials include at least one of SiO2, Al2O3, and MgF2. Protective eyeglass lenses have an isolation greater than OD2 at the required cutoff laser wavelength and a color saturation less than 0.1 in a White environment under CIE-1931 standards.

[0061] Compared to existing technologies, the medical goggle lens design method of this invention obtains three stimulus values ​​based on the corresponding curves x(λ), y(λ), and z(λ) of the three cone cells of the human eye to the visible spectrum. These three stimulus values ​​are then normalized using a standard observer response function, with a chromaticity set to be less than 0.1. Therefore, the range of x, y, and z values ​​is 0.32-0.34. The laser wavelength that needs to be cut off is then obtained, and the transmittance of other wavelengths is adjusted to obtain the corresponding x, y, and z design values. Based on these x, y, and z design values, an optical thin film system is designed to obtain the corresponding film system. Through these steps, a cutoff is achieved within a specific wavelength range, preventing damage to the human eye from laser radiation. The system also features high transmittance, low chromatic aberration, and a near-colorless film, reducing interference from the color of the protective goggle lens on medical personnel.

[0062] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A method for designing medical protective lenses, characterized in that, Includes the following steps: Based on the response curves x(λ), y(λ), and z(λ) of the three cone cells in the human eye to the visible spectrum, the standard observer response functions for the three stimulus values ​​are obtained. The formulas for the response functions for the three stimulus values ​​are as follows: Where S(λ) is the spectrum of natural light after passing through the goggles; x(λ) is the response curve of the red cone cells of the simulated human eye to the visible spectrum; y(λ) is the response curve of the green cone cells of the simulated human eye to the visible spectrum; z(λ) is the response curve of the blue cone cells of the simulated human eye to the visible spectrum; X is the stimulus value of red obtained using the standard observer response function; Y is the stimulus value of green obtained using the standard observer response function; and Z is the stimulus value of blue obtained using the standard observer response function. Normalizing the three stimulus values ​​yields: x is the color coordinate corresponding to red in colorimetry, y is the color coordinate corresponding to green in colorimetry, and z is the color coordinate corresponding to blue in colorimetry. The chromaticity is set to be less than 0.1, so the values ​​of x, y, and z are in the range of 0.32-0.

34. The laser wavelength that needs to be cut off is obtained, and the transmittance of other wavelengths is adjusted to obtain the corresponding x, y, and z design values. The optical thin film system is designed based on the x, y, and z design values ​​to obtain the corresponding film system. The film system is a film system formed by alternating stacking of multiple high refractive index film layers H and low refractive index film layers L. The high refractive index film layer material includes at least one of Ta2O5, Nb2O5, and TiO2, and the low refractive index film layer material includes at least one of SiO2, Al2O3, and MgF2. Based on the designed membrane system, the actual values ​​of x, y, and z, as well as the final chromaticity value, are obtained.

2. The medical goggle lens design method according to claim 1, characterized in that: The laser wavelength that needs to be cut off is 525-545nm.

3. A medical protective lens, manufactured using the medical protective lens design method as described in any one of claims 1-2, wherein the medical protective lens includes a substrate, characterized in that: The substrate has a film system consisting of multiple layers of high refractive index film H and low refractive index film L stacked alternately.

4. The medical protective lens according to claim 3, characterized in that: The substrate is made of silicon dioxide.

5. The medical protective lens according to claim 3, characterized in that: The high refractive index film material includes at least one of Ta2O5, Nb2O5, and TiO2.

6. The medical protective lens according to claim 3, characterized in that: The low-refractive-index film material includes at least one of SiO2, Al2O3, and MgF2.

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