Red light diffraction out-of-focus lens and glasses

Abstract

The utility model relates to the technical field of ophthalmic medical instruments, and discloses a red light diffraction defocus lens and glasses, one side surface of the red light diffraction defocus lens is provided with a plurality of defocus micro lenses, the farther the defocus micro lenses are from the center of the red light diffraction defocus lens, the larger the refractive power is, and the larger the refractive power is. A diffraction grating is arranged on the other side face of the red light diffraction defocus lens, and the farther the diffraction grating is from the center of the red light diffraction defocus lens, the shorter the period of the diffraction grating is, and the diffraction grating is used for transmitting light beams of a preset red light wave band. The red light diffraction out-of-focus lens and the pair of glasses can realize an out-of-focus effect and a red light treatment effect through the same lens.

Description

Technical Field

[0001] This utility model relates to the field of ophthalmic medical device technology, specifically to a red light diffraction defocusing lens and eyeglasses. Background Technology

[0002] Red light, as a novel eye-aiding treatment, illuminates the retina with light of a specific wavelength, causing the central choroid of the macula to thicken, providing more oxygen supply, improving scleral hypoxia, controlling axial elongation, and thus having a certain effect on relieving eye fatigue and improving vision.

[0003] Conventional defocus glasses typically only provide a defocusing effect, meaning the image point at the center of the retina falls precisely on the retina, while the image point at the periphery falls in front of the retina, ensuring clear vision while stimulating a reduction in axial length. Conventional red light therapy, on the other hand, usually uses a laser or LED light source to emit a beam of light, employing multiple optical devices for homogenization to obtain the desired uniform light spot. However, due to the lack of stability and safety of the light source, and the large space required for its use, it is inconvenient.

[0004] Therefore, there is a lack of solutions that can achieve both defocusing and red light therapy functions on the same lens, thereby improving vision, relieving eye strain, and providing adjunctive ophthalmic therapy. Utility Model Content

[0005] In view of this, the present invention provides a red light diffraction defocusing lens and glasses, which can overcome the technical problem that the prior art lacks a solution to achieve defocusing function and red light therapy function on the same lens.

[0006] The first aspect of this utility model provides a red light diffraction defocusing lens. A plurality of defocusing microlenses are provided on one side of the red light diffraction defocusing lens. The farther the defocusing microlenses are from the center of the red light diffraction defocusing lens, the greater the refractive power. A diffraction grating is provided on the other side of the red light diffraction defocusing lens. The farther the diffraction grating is from the center of the red light diffraction defocusing lens, the smaller the period of the diffraction grating, so as to transmit a beam of light in a preset red light band.

[0007] This invention relates to a red light diffraction defocusing lens. It utilizes several defocusing microlenses on one side of the lens. The farther the defocusing microlenses are from the center of the lens, the greater their refractive power, thus achieving a defocusing effect. Simultaneously, a diffraction grating is provided on the other side of the lens. The farther the diffraction grating is from the center, the smaller its period, used to transmit beams of light in a preset red wavelength band. The lens can collect red wavelength light through the diffraction grating, allowing for use in natural environments without the need for laser or LED light sources. This significantly reduces the safety issues associated with the stability of various laser or LED light sources. By achieving defocusing on the same lens while receiving more red light, it improves vision, relieves eye strain, and provides adjunctive ophthalmic therapy.

[0008] Optionally, the red light diffraction defocusing lens includes a central light-transmitting region and a defocusing diffraction region surrounding the central light-transmitting region, with a defocusing microlens and a diffraction grating disposed in the defocusing diffraction region.

[0009] In this approach, by placing the defocused microlens and diffraction grating in the defocused diffraction region, a light-transmitting area is retained in the center of the lens. This allows for adjustment of the peripheral field of vision without affecting the central field of vision, which may help reduce the accommodation burden on the eye.

[0010] Optionally, the defocus microlens and the diffraction grating are staggered, or the diffraction grating covers the defocus microlens.

[0011] In this method, the defocused microlens and diffraction grating are staggered, which can reduce the interference of the light beam when passing through the lens and improve the transmission efficiency and imaging quality of the light beam.

[0012] Optionally, the diffraction grating includes transparent and opaque portions spaced apart, and the period of the diffraction grating, the width of the transparent portion, and the width of the opaque portion satisfy the following requirements:

[0013] dsinθ=(a+b)sinθ=kλ

[0014] Where d is the period of the diffraction grating, a is the width of the transparent part, b is the width of the opaque part, θ represents the angle between the beam and the normal after passing through the diffraction grating, k is the diffraction order, and λ is the center wavelength of the preset red light band.

[0015] In this method, selective diffraction of a preset red light band can be achieved by precisely controlling the period of the diffraction grating and the width of the transparent and opaque parts.

[0016] Optionally, the defocused microlenses are arranged in an array.

[0017] In this approach, the defocused microlenses are arranged in an array, which helps to achieve a smoother visual transition and more precise defocus control.

[0018] Optionally, the period of the defocused microlens is 1μm-10cm.

[0019] In this method, the period of the microlens can be adjusted according to different application requirements.

[0020] Optionally, the ratio of the total area of ​​each defocused microlens to the area of ​​the red light diffraction defocusing lens is 40%-99%.

[0021] In this method, by controlling the ratio of the total area of ​​the defocusing microlens to the total area of ​​the lens, the ratio of the defocused beam can be optimized to achieve a better visual effect.

[0022] Optionally, the wavelength of the preset red light band transmitted by the diffraction grating is 620nm-750nm.

[0023] In this method, the preset red light band wavelength range covers the area of ​​the human eye that is sensitive to red light, which helps to improve the effect of adjunctive treatment.

[0024] Optionally, the defocused diffraction region includes several layers of annular regions concentrically arranged with the central light-transmitting region, wherein the diffraction gratings in each annular region have the same period, and the defocused microlenses in each annular region have the same period.

[0025] Alternatively, the defocused diffraction region can be divided into several sub-regions based on the defocused microlens. A diffraction grating is set in each sub-region, and the period of the diffraction grating is the same as that of the red light diffraction defocused lens, and the period of the defocused microlens is the same as that of the red light diffraction defocused lens.

[0026] In this approach, the defocused diffraction region consists of concentric annular regions, with the diffraction gratings and defocused microlenses in each annular region having the same period. This design provides continuous and uniform beam control, which helps to achieve finer optical adjustments and visual effects.

[0027] Optionally, the defocusing microlens and the diffraction grating are integrally formed on the red light diffraction defocusing lens, or the defocusing microlens is disposed on the first thin film and the diffraction grating is disposed on the second thin film, with the first thin film and the second thin film respectively disposed on the two sides of the red light diffraction defocusing lens.

[0028] In this approach, the one-piece molding structure can reduce the size of the device, while the method of setting the first and second thin films can be added using existing lenses, and the method of adding defocus microlenses and diffraction gratings can be flexibly set.

[0029] The second aspect of this utility model provides a red light diffraction defocusing eyeglass, including a red light diffraction defocusing lens as described in any of the first aspects. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a front view of the red light diffraction defocusing lens according to an embodiment of the present invention;

[0032] Figure 2 This is a rear view of the red light diffraction defocusing lens according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a red light diffraction defocusing lens according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of another red light diffraction defocusing lens according to an embodiment of the present invention;

[0035] Figure 5 This is an optical path diagram of the red light diffraction defocusing lens according to an embodiment of the present invention;

[0036] Figure 6 This is a front view of the red light diffraction defocus glasses according to an embodiment of the present invention;

[0037] Figure 7 This is a top view of the red light diffraction defocus glasses according to an embodiment of the present invention;

[0038] Explanation of reference numerals in the attached figures:

[0039] 1-Defocused diffraction area; 2-Defocused microlens; 3-Central light-transmitting area; 4-Diffraction grating; 5-Transparent part; 6-Opaque part; 7-Incident beam; 8-Retina; 9-Imaging point; 10-Preset red light band beam; 11-Frame; 12-Template. Detailed Implementation

[0040] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0044] Currently, defocusing effects in lenses are achieved through microlens arrays. A microlens array refers to an array of microlenses of different sizes, periods, and shapes fabricated on the lens surface. Its basic principle is to focus light of different wavelengths by deflecting light through microlenses at different positions, thereby achieving a defocusing effect.

[0045] Diffraction gratings have significant applications in various fields such as lighting, biomedicine, and observation. They have already been used in optical instruments to achieve diffraction of beams of specific wavelengths, and thus diffraction technology has gradually gained popularity.

[0046] In the field of red light-assisted therapy, there is a lack of solutions that can achieve both defocusing and red light therapy functions on the same lens, thereby improving vision, relieving eye strain, and providing optometric therapy.

[0047] In view of this, this utility model embodiment combines microlens array technology and diffraction grating technology to propose a red light diffraction defocus lens, which plays a certain role in suppressing the increase of visual acuity and improving eye vision.

[0048] This invention presents a red light diffraction defocusing lens, which is used to improve vision, relieve eye fatigue, and assist in improving eye health.

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 4 andFigure 5 As shown, a plurality of defocus microlenses 2 are provided on one side of the red light diffraction defocus lens. The farther the defocus microlenses 2 are from the center of the red light diffraction defocus lens, the greater the refractive power. A diffraction grating 4 is provided on the other side of the red light diffraction defocus lens. The farther the diffraction grating 4 is from the center of the red light diffraction defocus lens, the smaller the period of the diffraction grating 4, which is used to transmit a beam 10 of a preset red light band.

[0050] Specifically, refractive power refers to the ability of a lens to refract light. The stronger the refractive power, the greater the degree of refraction of the light beam after passing through the lens.

[0051] The material of a red light diffraction defocusing lens can be a light-transmitting material such as quartz glass or resin. The overall shape of a red light diffraction defocusing lens can be varied, such as circular, elliptical, or rectangular.

[0052] In one example, the red light diffraction defocusing lens is a circular glass lens.

[0053] The shape of a single defocusing microlens 2 can be arbitrary, such as circular, square, hexagonal, etc. The arrangement of the defocusing microlenses 2 can be arbitrary, such as square arrangement, hexagonal arrangement, chirped arrangement, random arrangement, etc. The type of defocusing microlens 2 can also be concave or convex.

[0054] The period of the defocused microlens 2 is 1μm-10cm. The period of the microlens can be adjusted according to different application requirements. As the distance from the center of the lens increases, the period decreases.

[0055] The period of the defocus microlens 2 is equal to the aperture of a single defocus microlens 2 sub-unit.

[0056] In one example, by setting the defocus microlens 2 as a convex lens or a meniscus lens, it can have a certain refractive power. The farther away from the center of the red light diffraction defocus lens, the greater the refractive power. This can achieve the defocus function, that is, the imaging point 9 at the center of the retina 8 falls exactly on the retina 8, while the imaging points 9 around the retina 8 fall in front of the retina 8. This ensures that the image can be seen clearly while stimulating the retina 8 to reduce the axial length of the eye.

[0057] The diffraction pattern of the diffraction grating 4 can be selected in various ways, such as stepped or sawtooth patterns.

[0058] The diffraction grating 4 can be set as an integral ring grating, or the surface can be divided into blocks to form a modular grating.

[0059] Furthermore, both the defocusing microlens 2 and the diffraction grating 3 are integrally formed on the red light diffraction defocusing lens, or the defocusing microlens 2 is disposed on the first thin film, and the diffraction grating 3 is disposed on the second thin film, with the first and second thin films respectively disposed on the two side surfaces of the red light diffraction defocusing lens. That is, the diffraction grating 4 and the defocusing microlens 2 can be directly fabricated on the red light diffraction defocusing lens, or they can be made into separate thin films and then attached to the front and back surfaces of the red light diffraction defocusing lens by adhesive bonding or other methods. The integrally formed structure can reduce the size of the device, while the method of setting the first and second thin films can utilize existing lenses for addition, thus allowing for flexible settings of the addition method of the defocusing microlens 2 and the diffraction grating 3.

[0060] Specifically, the red light diffraction defocusing lens of this invention needs to be worn in front of the eyes during use. The diffraction grating 4 can be set on the side of the red light diffraction defocusing lens that is close to the eyes, or it can be set on the side of the red light diffraction defocusing lens that is far away from the eyes.

[0061] In one example, the diffraction grating 4 is positioned on the side of the red light diffraction defocusing lens closer to the eye, and correspondingly, the defocusing microlens 2 is positioned on the side of the red light diffraction defocusing lens farther from the eye.

[0062] The working principle of the red light diffraction defocusing lens is as follows:

[0063] An incident light beam 7 illuminates a red light diffraction defocusing lens. The incident light beam 7 can be natural light such as sunlight or bioluminescence, or a beam of light produced by an artificial light source such as an incandescent lamp. Multiple defocusing microlenses 2 are arranged on one side of the red light diffraction defocusing lens. The farther the defocusing microlenses 2 are from the center of the red light diffraction defocusing lens, the greater their refractive power. This ensures that the imaging point 9 at the center of the retina 8 falls exactly on the retina 8, while the imaging points 9 around the periphery of the retina 8 fall in front of the retina 8. A diffraction grating 4 on the other side of the red light diffraction defocusing lens is used to direct red light into the retina 8 region. The closer the diffraction grating 4 is to the center of the red light diffraction defocusing lens, the larger its circumference. This ensures that only light beams 10 with a preset red light band can enter the eye, while light beams of other wavelengths will be deflected from the eye region.

[0064] This invention relates to a red light diffraction defocusing lens. It comprises several defocusing microlenses 2 on one side of the lens. The farther the defocusing microlenses 2 are from the center of the lens, the greater their refractive power, thus achieving a defocusing effect. Simultaneously, a diffraction grating 4 is provided on the other side of the lens. The farther the diffraction grating 4 is from the center, the smaller its period, used to transmit a beam 10 of a preset red light band. The lens can collect red wavelength light through the diffraction grating 4, allowing it to be used in natural environments without the need for laser or LED light sources. This significantly reduces the safety issues caused by the instability of various laser or LED light sources. By achieving defocusing on the same lens while receiving more red light, it improves vision, relieves eye strain, and provides adjunctive ophthalmic therapy.

[0065] The red light diffraction defocus lens can be used in natural light and can be worn daily, achieving the effect of a regular defocus lens. In addition, it uses diffraction grating 4 to focus red light as much as possible, continuously providing nutrients to the eyes.

[0066] The red light diffraction defocusing lens of this invention can be designed as everyday glasses, which can effectively reduce the size of glasses.

[0067] In some alternative embodiments, the red light diffraction defocusing lens includes a central light-transmitting region 3 and a defocusing diffraction region 1 surrounding the central light-transmitting region 3, with a defocusing microlens 2 and a diffraction grating 4 disposed in the defocusing diffraction region 1.

[0068] In this method, by setting the defocus microlens 2 and the diffraction grating 4 in the defocus diffraction region 1, a light-transmitting area is retained in the center of the lens. This allows for adjustment of the peripheral field of vision without affecting the central field of vision, which may help reduce the accommodation burden on the eye.

[0069] Furthermore, the defocused diffraction region 1 includes several layers of annular regions concentrically arranged with the central light-transmitting region 3. The diffraction gratings 4 in each annular region have the same period, and the defocused microlenses 2 in each annular region have the same period.

[0070] Specifically, the central light-transmitting area 3 is located at the center of the red light diffraction defocusing lens and is made of light-transmitting quartz glass material. It is preferably a circular area, but it can also be a rectangular, elliptical, or other areas.

[0071] There is no limit to the number of layers in the diffraction defocusing region; it can be set according to actual needs, such as 2, 3, or 4 layers.

[0072] The defocused diffraction region 1 can be of any shape, such as a circle or a square. The size of the defocused diffraction region 1 is also arbitrary and can be set as needed. The number of diffraction gratings 4 and defocused microlenses 2 contained in each layer of defocused diffraction region can be determined according to the area of ​​each layer of defocused diffraction region, the area of ​​the diffraction grating 4, and the area of ​​the defocused microlens 2.

[0073] In this approach, the defocused diffraction region 1 is composed of concentric annular regions, and the diffraction grating 4 and the defocused microlens 2 in each annular region have the same period. This design can provide continuous and uniform beam control, which helps to achieve finer optical adjustments and visual effects.

[0074] In some embodiments, the defocused diffraction region 1 is divided into several sub-regions based on the defocused microlens 2. A diffraction grating 4 is correspondingly set in each sub-region. The diffraction grating 4 with the same center distance as the red light diffraction defocusing lens has the same period as the defocused microlens 2 with the same center distance as the red light diffraction defocusing lens. This allows the defocused microlens 2 to be divided into multiple parts, with a diffraction grating 4 correspondingly set in each part, achieving flexible configuration.

[0075] like Figure 3 As shown, in some embodiments, the defocused microlens 2 and the diffraction grating 4 are staggered.

[0076] In this method, the defocused microlens 2 and the diffraction grating 4 are staggered, which can reduce the interference of the light beam when passing through the lens and improve the transmission efficiency and imaging quality of the light beam.

[0077] like Figure 4 As shown, in some embodiments, the diffraction grating 4 covers the defocusing microlens 2, and the diffraction grating is uniformly distributed on the back of the red light diffraction defocusing lens.

[0078] Specifically, the ratio of the total area of ​​each defocusing microlens 2 to the area of ​​the red light diffraction defocusing lens is 40%-99%.

[0079] For example, the ratio of the total area of ​​each defocused microlens 2 to the area of ​​the red light diffraction defocused lens is 40%, 80%, 99%, etc.

[0080] Among them, when the ratio of the total area of ​​the defocus microlens 2 to the area of ​​the red light diffraction defocus lens is 75%, it has a good red light therapy effect and defocus correction effect.

[0081] In this method, by controlling the ratio of the total area of ​​the defocus microlens 2 to the total area of ​​the lens, the ratio of the defocused beam can be optimized to balance the red light therapy effect and the defocus correction effect.

[0082] Furthermore, the defocused microlenses 2 are arranged in an array.

[0083] For example, a two-layer ring or square array of defocus microlenses, arranged in an array, helps to achieve a smoother visual transition and more precise defocus control.

[0084] In some embodiments, the diffraction grating 4 includes transparent portions 5 and opaque portions 6 spaced apart, and the period of the diffraction grating 4, the width of the transparent portions 5, and the width of the opaque portions 6 meet the following requirements:

[0085] disnθ=(a+b)sinθ=kλ

[0086] Where d is the period of the diffraction grating 4, a is the width of the transparent part 5, b is the width of the opaque part 6, θ represents the angle between the beam and the normal after passing through the diffraction grating 4, k is the diffraction order, and λ is the center wavelength of the preset red light band.

[0087] Specifically, the wavelength of the preset red light band transmitted by the diffraction grating 4 is 620nm-750nm, and the diffraction order is ±1 order.

[0088] Preferably, the center wavelength λ of the preset red light band is 650nm, but it can also include light in the 620nm to 750nm band. In related technologies, filter devices are used to obtain red light in the 620nm to 750nm band to achieve the auxiliary therapeutic effect and fatigue relief function of red light. Among them, red light with a center wavelength of 650nm has a stronger auxiliary therapeutic effect on relieving eye fatigue and vision problems than red light of other wavelengths. Therefore, this embodiment of the invention can improve the fatigue relief and auxiliary therapeutic effect by diffracting and converging red light in the 650nm region.

[0089] In one specific embodiment, the red light diffraction defocusing lens used is a circular glass lens, with two annular diffraction defocusing regions outside the central light-transmitting region 3. The diffraction defocusing regions are annular regions concentrically arranged with the central light-transmitting region 3.

[0090] A defocusing microlens 2 with the same period is set on one side of the defocusing region of each layer, and a diffraction grating 4 that is staggered from the defocusing microlens 2 is set on the other side. The diffraction grating 4 in the same layer of the defocusing region has the same period, and the period of the diffraction grating 4 is larger the closer it is to the center of the red light diffraction defocusing lens.

[0091] Assume that the red light diffraction defocus glasses are worn on the eyes, and the distance between the retina 8 and the eye is 5cm, the distance between the inner diffraction defocus area and the center is 1cm, and the distance between the outer diffraction defocus area and the center is 2cm.

[0092] Since the diffraction defocus region is a ring-shaped region concentric with the central light-transmitting region 3, the distance of the diffraction grating 4 from the center of the lens in each layer of the diffraction defocus region is equal, so the period of each layer of the diffraction grating 4 is the same.

[0093] The inner diffraction grating 4 has a period of d1, with the transparent portion 5 having a width of a1 and the opaque portion 6 having a width of b1. The outer diffraction grating 4 has a period of d2, with the transparent portion 5 having a width of a2 and the opaque portion 6 having a width of b2.

[0094] In this embodiment, ±1 order is used, that is, the secondary order is large. When the red light wavelength is selected as 650nm, according to the formula dsinθ=(a+b)sinθ=kλ of the diffraction grating 4, the period d1 of the inner diffraction grating 4 is calculated to be 3.3μm and the period d2 of the outer diffraction grating 4 is 1.8μm.

[0095] In this embodiment, by precisely controlling the period of the diffraction grating 4 and the widths of the transparent portion 5 and the opaque portion 6, selective diffraction of a preset red light band can be achieved, so that as long as the red light wavelength can enter the eye, light of other wavelengths will be deflected from the eye area.

[0096] This invention also provides a red light diffraction defocusing eyeglass, including the red light diffraction defocusing lens as described in the above embodiments.

[0097] Specifically, such as Figure 6 and Figure 7 As shown, the red light diffraction defocus glasses include temples 12 and frames 11. The temples 12 are used to fix the frames 11 to the wearer's eyes. The frames 11 are provided with red light diffraction defocus lenses as described in the above embodiment.

[0098] While embodiments of the present invention have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A red light diffraction defocusing lens, characterized in that: The red light diffraction defocusing lens has several defocusing microlenses on one side surface. The farther the defocusing microlenses are from the center of the red light diffraction defocusing lens, the greater the refractive power. A diffraction grating is provided on the other side of the red light diffraction defocusing lens. The farther the diffraction grating is from the center of the red light diffraction defocusing lens, the smaller the period of the diffraction grating, so as to transmit a beam of light in a preset red light band.

2. The red light diffraction defocusing lens according to claim 1, characterized in that: The red light diffraction defocusing lens includes a central light-transmitting region and a defocusing diffraction region surrounding the central light-transmitting region, and the defocusing microlens and the diffraction grating are disposed in the defocusing diffraction region.

3. The red light diffraction defocusing lens according to claim 1, characterized in that: The defocus microlens and the diffraction grating are staggered, or the diffraction grating covers the defocus microlens.

4. The red light diffraction defocusing lens according to claim 1, characterized in that: The diffraction grating includes transparent and opaque portions spaced apart. The period of the diffraction grating, the width of the transparent portion, and the width of the opaque portion satisfy the following requirements: dsinθ=(a+b)sinθ=kλ Where d is the period of the diffraction grating, a is the width of the transparent part, b is the width of the opaque part, θ represents the angle between the beam and the normal after passing through the diffraction grating, k is the diffraction order, and λ is the center wavelength of the preset red light band.

5. The red light diffraction defocusing lens according to claim 1, characterized in that: The defocused microlenses are arranged in an array.

6. The red light diffraction defocusing lens according to claim 1, characterized in that: The period of the defocused microlens is 1μm-10cm.

7. The red light diffraction defocusing lens according to claim 1, characterized in that: The ratio of the total area of ​​each of the defocused microlenses to the area of ​​the red light diffraction defocusing lens is 40%-99%.

8. The red light diffraction defocusing lens according to claim 1, characterized in that: The wavelength of the preset red light band transmitted by the diffraction grating is 620nm-750nm.

9. The red light diffraction defocusing lens according to claim 2, characterized in that: The defocused diffraction region includes several layers of annular regions concentrically arranged with the central light-transmitting region. The diffraction gratings in each layer of the annular region have the same period, and the defocused microlenses in each layer of the annular region have the same period. Alternatively, the defocused diffraction region can be divided into several sub-regions based on the defocused microlens. The diffraction grating is set in each sub-region, and the period of the diffraction grating is the same as that of the red light diffraction defocused lens, and the period of the defocused microlens is the same as that of the red light diffraction defocused lens.

10. The red light diffraction defocusing lens according to claim 1, characterized in that: The defocus microlens and the diffraction grating are integrally formed on the red light diffraction defocus lens, or the defocus microlens is disposed on the first thin film and the diffraction grating is disposed on the second thin film, with the first thin film and the second thin film respectively disposed on both sides of the red light diffraction defocus lens.

11. A red light diffraction defocusing glasses, characterized in that: Including the red light diffraction defocusing lens as described in any one of claims 1 to 10.

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