Methods, devices, and usage for changing the size of a therapeutic light source spot

Abstract

This invention relates to the field of medical and health care equipment technology, and discloses a method for changing the size of a therapeutic light source spot. The method includes a light source unit for emitting light; and an optical element. The light emitted by the light source unit is deflected by the optical element so that the exit angle of the emitted light is greater than the incident angle, and the light emitted by the light source unit is diverged by the optical element to form a larger area light spot. This method for changing the size of the therapeutic light source spot, based on the scattering effect of a concave lens, scatters the light onto the projection surface at a certain angle, thereby increasing the overall spot size. This increases the area of ​​laser irradiation, making it suitable for different users. Simultaneously, the distance between the eyeball and the concave lens can be controlled to change the size of the light spot irradiating the eye, thereby increasing the overall area of ​​laser irradiation on the user's eye and improving the training effect.

Description

Technical Field

[0001] This invention relates to the field of medical and health care equipment technology, specifically to a method, apparatus, and usage method for changing the size of a therapeutic light source spot. Background Technology

[0002] Myopia, hyperopia, and astigmatism are all eye diseases caused by refractive errors that result in blurred vision without glasses. In addition, high myopia (more than -600 degrees) makes the retina thinner and more brittle, which can easily lead to retinal detachment and blindness. The common treatments are wearing glasses and laser therapy.

[0003] Chinese Patent Publication No. CN100417366C discloses a "laser vision correction device," which is a device-readable medium for controlling a laser vision correction system. The technical solution uses laser to treat and correct vision, and achieves the overall technical solution by irradiating the user's eyes with a laser.

[0004] During the conceptualization process, the applicant discovered that the laser beam irradiation on the user's eyes is always of a fixed size, making it impossible to adjust the laser irradiation area according to the individual. For example, each user's eye size is different; while the eye size tends to be the same, the degree to which the eyes are open varies. Therefore, when a fixed laser area is irradiated on a user's eyes, if the user's open eyes are small but the laser spot is large, the amount of laser light irradiating the user's fundus will be relatively reduced, thus decreasing the effectiveness of laser training. Therefore, the applicant proposed a method to change the size of the treatment light source spot to solve the aforementioned problems. Summary of the Invention

[0005] Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a method for changing the size of the light spot in a treatment light source, which solves the problem that the fixed light spot of laser irradiation cannot be applied to different eye opening states.

[0007] Technical solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A method for changing the size of a therapeutic light source spot, comprising a light source unit for emitting light;

[0010] The optical element deflects the light emitted by the light source unit, making the exit angle of the light emitted by the light source unit greater than the incident angle, and causing the light emitted by the light source unit to diverge after being dispersed by the optical element, forming a large area of ​​light spot.

[0011] Preferably, the focal length of the optical element, the initial emitted spot size of the light source unit, and the reference size radius or length and width are determined, and then the distance between the projection surface and the optical element that needs to be set is calculated according to the following formula;

[0012]

[0013] L = arctan(r²) - f;

[0014] α is the emission angle, r1 is the initial emission spot radius, f is the focal length of the optical element, r2 is the actual spot radius irradiated onto the projection surface, and L is the distance that needs to be set between the projection surface and the optical element.

[0015] Preferably, the focal length of the optical element, the initial emitted spot size of the light source unit, and the distance between the projection surface and the optical element are determined, and then the radius of the spot that illuminates the projection surface after divergence is calculated according to the following formula;

[0016]

[0017] r2 = (L + f)tanα;

[0018] α is the emission angle, r1 is the initial emission spot radius, f is the focal length of the optical element, and r2 is the actual spot radius irradiated onto the projection surface.

[0019] Preferably, the actual radius of the light spot illuminating the projection surface, the initial size of the emitted light spot of the light source unit, and the distance between the projection surface and the optical element are determined, and then the focal length of the optical element is calculated according to the following formula:

[0020]

[0021]

[0022] α is the emission angle, r1 is the initial emission spot radius, L is the distance between the projection surface and the optical element that needs to be set, r2 is the actual spot radius irradiated onto the projection surface, and f is the focal length of the optical element.

[0023] A vision training device, applied to the aforementioned method for changing the size of the therapeutic light source spot, further includes:

[0024] The control module allows the user to control the operation of the light source unit;

[0025] The contact module is used to contact the user's eye area;

[0026] The connection module is used to connect the light source unit and optical components.

[0027] Preferably, the optical element is a concave lens;

[0028] The light source unit is a laser, the control module is a circuit board, the laser is mounted on the circuit board, the circuit board is mounted on the housing, and an aperture is provided in the optical path of the laser;

[0029] The contact module is a cover;

[0030] The connecting module is a lens barrel;

[0031] One end of the lens tube is connected to the housing, and the other end of the lens tube is connected to the cover. The laser is located on one side of the lens tube, and the concave lens is located on the other side of the lens tube or inside the lens tube.

[0032] The laser emits parallel light rays inside the lens barrel, which pass through a concave lens and then illuminate the pupil of the user's eye.

[0033] A method of using a vision training device, applicable to any of the vision training devices described above, further includes the following steps:

[0034] Step 1: Select a concave lens with a fixed focal length, and measure the initial spot radius emitted by the laser and the spot area that needs to be illuminated on the projection surface;

[0035] Step 2: Calculate the distance from the user's eye to the concave lens;

[0036] Step 3: Adjust the distance between the projection surface and the concave lens to be the same as the distance calculated in Step 2;

[0037] Step 4: The laser emits light.

[0038] Preferably, the following steps are also included:

[0039] Step 5: Determine the distance between the projection surface and the concave lens;

[0040] Step 6: Measure the initial spot radius emitted by the laser, the spot area to be illuminated on the projection surface, and the distance from the projection surface to the concave lens;

[0041] Step 7: Calculate the required focal length of the concave lens;

[0042] Step 8: Select the concave lens with the focal length calculated in Step 6, and place the concave lens with that focal length at the distance position determined in Step 1.

[0043] Step 9: The laser emits light.

[0044] Preferably, the usage steps include the following:

[0045] Step 10: Select a concave lens with a fixed focal length and place it in the device.

[0046] Step 11: Adjust the distance between the projection surface and the concave lens until the distance is determined;

[0047] Step 12: Measure the area of ​​the light spot that needs to be illuminated on the projection surface, and check the focal length of the concave lens;

[0048] Step 13: Calculate the initial spot radius that the laser needs to emit;

[0049] Step Fourteen: Adjust the initial spot radius emitted by the laser to be consistent with the spot radius calculated in Step Thirteen;

[0050] Step 15: The laser emits light.

[0051] Beneficial effects

[0052] Compared with the prior art, the present invention provides a method for changing the spot size of a therapeutic light source, which has the following beneficial effects:

[0053] This method for changing the size of the laser spot in a treatment light source uses a concave lens to scatter the light emitted by the laser. Based on the scattering effect of the concave lens, the light is scattered at a certain angle onto the projection surface, i.e., the user's eyes, thus increasing the overall spot size. This increases the area illuminated by the laser, making it suitable for different users. The spot size can be adjusted by changing different curved concave lenses, and the distance between the eyeball and the concave lens can also be controlled to change the size of the spot illuminating the eye, thereby increasing the overall area of ​​laser illumination on the user's eyes and improving the training effect. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the overall structure of a method for changing the size of a therapeutic light source spot proposed in this invention;

[0055] Figure 2 This is a partial cross-sectional schematic diagram of a method for changing the size of a therapeutic light source spot proposed in this invention;

[0056] Figure 3 This is a schematic diagram showing the connection between the lens barrel and the concave lens in a method for changing the size of a therapeutic light source according to the present invention.

[0057] Figure 4 This is a schematic diagram of the light deflection angle of a method for changing the size of a therapeutic light source according to the present invention;

[0058] Figure 5 This is a schematic diagram of light deflection in a method for changing the size of a therapeutic light source according to the present invention;

[0059] Figure 6This is a schematic diagram illustrating a method for changing the size of a therapeutic light source spot according to the present invention, where the light spot illuminates the eye. Detailed Implementation

[0060] 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.

[0061] Example 1: A method for changing the size of the light spot in a treatment light source (Part 1)

[0062] This embodiment adjusts the distance between the user's eye and the concave lens to change the size of the light spot area illuminating the light source.

[0063] During implementation, the light source unit first emits a laser beam of a certain area. The user can power on the device using the control buttons to initiate laser emission. Upon receiving the power-on signal, laser 1 will emit a laser beam with a specific wavelength range. The emitted beam is red light, with a wavelength range of 622nm-760nm. Using 650nm red light can improve microcirculation in the fundus, promote dopamine secretion from retinal cells, and effectively inhibit abnormal axial elongation. Simultaneously, the 650nm red light acts on the choroid, thickening the thinned choroid, improving blood and oxygen supply to the sclera, restoring elasticity through elastic fibers, remodeling the sclera, reducing axial length, and decreasing refractive error.

[0064] Secondly, the light beam passes through the aperture 5, which cuts the light into a small area of ​​parallel light. This is because some astigmatism may occur during laser emission. The aperture 5 is placed in the optical path to cut off the standard initial area beam, preventing excess light from diverging and causing unevenness or astigmatism in the final beam. In this embodiment, the aperture 5 has a circular structure; however, this technical solution is not limited to the shape of the aperture 5, as long as it can produce a beam of a certain area that illuminates the user's eye.

[0065] Secondly, when several small-area parallel light rays pass through a concave lens, the lens deflects them, causing the exit angle to be greater than the incident angle. Because of this characteristic of concave lenses, they can directly deflect and diverge the light rays at a specific angle, thus exhibiting a diverging effect. Parallel light rays are deflected by a concave spherical lens, causing them to diverge and directly increasing the area illuminated by the light.

[0066] Finally, the light rays, after being deflected by the concave lens, form a suitable light spot that illuminates the projection surface. The deflected light then directly shines into the user's eyes. Because the area of ​​the eye illuminated by different users may vary, there are three adjustment methods: first, controlling the distance between the user's eyes and the concave lens; second, replacing the aperture stop 5 with a different size; and third, replacing the concave lens with a different concave curvature. This embodiment provides a method of controlling the distance between the user's eyes and the concave lens. The following example illustrates how controlling the distance between the eyes and the concave lens can control the appropriate size of the light spot. First, the focal length of the selected concave lens and the initial radius of the emitted light spot from the light source unit are determined.

[0067] The focal length of a concave lens is determined during manufacturing, so it is a known parameter. The initial size of the emitted light spot from the light source unit can be measured using the following method:

[0068] Step C1: The light source unit directly emits light onto the projection surface 4; and in this embodiment, the projection surface 4 is the user's eye or pupil.

[0069] Step C2: Measure the radius of the pattern on the projection surface and use this radius as the initial emission spot radius.

[0070] Because the light source unit is also equipped with an aperture 5, when the light source unit emits light, it will capture a fixed area of ​​light spot after passing through the interception device. Therefore, the light emitted directly from the light source unit will hit the projection surface as the circle of the initial light spot, that is, the radius of the initial emitted light spot is obtained.

[0071] The distance L between the eye and the concave lens is calculated using the following formula, and the desired cross-sectional area of ​​the light spot is obtained: When the focal length f of the concave lens is 15mm, the r1 of the aperture stop 5 is 10mm, and the required projection area radius r2 is 100mm, the maximum exit angle α can be calculated using the following formula:

[0072]

[0073] Therefore, the maximum angle of light emission is 26°.

[0074]

[0075] The final result is L = 135mm. Therefore, to obtain a suitable light spot with a radius of 100mm, the distance between the eye and the concave lens needs to be set at 135mm.

[0076] Example 2: A method for changing the size of the treatment light source spot (II)

[0077] In this embodiment, concave lenses with different focal lengths are used to change the size of the light spot area illuminating the user's eye.

[0078] Specifically, this can be achieved through the following steps:

[0079] During implementation, the light source unit first emits a laser beam of a certain area. After receiving the power-on signal, the laser 1 will emit laser light. The laser wavelength emitted by the laser 1 is within a certain range, and the beam emitted by the laser 1 is red light, with a wavelength range of 622nm-760nm.

[0080] Secondly, the light passes through the aperture 5, which cuts the light into a small area of ​​parallel light. This is because there may be some scattering during the emission of the laser 1. The aperture 5 is set in its optical path to cut the standard initial area beam and avoid the excess light from diverging, which would cause the final light spot to be uneven and have scattering.

[0081] Secondly, several small-area parallel light rays pass through a concave lens, and the lens deflects the light rays so that the exit angle is greater than the incident angle.

[0082] Since the focal length of a concave lens is determined during manufacturing, it is a known parameter. This embodiment uses concave lenses with different focal lengths. The initial size of the emitted light spot of the light source unit can be measured using the following method:

[0083] Step C1: Directly emit light from the light source unit onto the projection surface;

[0084] Step C2: Measure the radius of the pattern on the projection surface and use this radius as the initial emission spot radius.

[0085] After passing through the interception device, a fixed area of ​​light spot will be intercepted. The interception device is aperture 5. Therefore, the light emitted directly from the light source unit will hit the projection surface and form the circle of the initial light spot, that is, the radius of the initial emitted light spot is obtained.

[0086] When the device distance between the eyepiece and the concave lens is determined, that is, the distance L between the user's eye and the concave lens, the desired cross-sectional area of ​​the light spot is as follows: If the distance L between the user's eye and the concave lens is determined to be 80mm, and the aperture 5 has a radius r1 of 10mm, and the required projection area radius r2 is 100mm, the maximum emission angle α can be calculated using the following formula:

[0087]

[0088] The calculated α = 51°. The focal length f of the concave lens is then calculated using the following formula.

[0089]

[0090]

[0091] The final calculated f value is 8.9mm. Therefore, when the distance between the user's eye and the concave lens is L = 80mm, the radius r1 of the aperture 5 is 10mm, and the desired spot radius is r2 = 100mm, the maximum divergence angle of the concave lens is 51°. Thus, a concave lens with a focal length of 8.9mm needs to be selected.

[0092] Example 3: A method for changing the size of the treatment light source spot (Part 3)

[0093] In this embodiment, a radius aperture 5 is selected to change the size of the light spot area illuminating the user's eyes.

[0094] Specifically, this can be achieved through the following steps:

[0095] During implementation, after receiving the power-on signal, laser 1 will emit laser light. The wavelength of the laser emitted by laser 1 is within a certain range, and the beam emitted by laser 1 is red light, with a wavelength range of 622nm-760nm.

[0096] Secondly, the light passes through the aperture 5, which cuts the light into a small area of ​​parallel light. This is because there may be some scattering during the laser's emission process. The aperture 5 is set in its optical path to cut off the standard initial area beam and avoid the excess light from diverging, which would cause the final light spot to be uneven and have scattering.

[0097] Secondly, several small-area parallel light rays pass through a concave lens, and the lens deflects the light rays so that the exit angle is greater than the incident angle.

[0098] Since the focal length of a concave lens is determined during manufacturing, it is a known parameter. This embodiment uses concave lenses with different focal lengths. The initial size of the emitted light spot of the light source unit can be measured using the following method:

[0099] Step C1: Directly emit light from the light source unit onto the projection surface;

[0100] Step C2: Measure the radius of the pattern on the projection surface and use this radius as the initial emission spot radius.

[0101] After passing through the interception device, a fixed area of ​​light spot will be intercepted. The interception device is aperture 5. Therefore, the light emitted directly from the light source unit will hit the projection surface and form the circle of the initial light spot, that is, the radius of the initial emitted light spot is obtained.

[0102] When the device distance between the eye mask and the concave lens is determined, that is, the distance L between the user's eye and the concave lens, the desired cross-sectional area of ​​the light spot is as follows: If the distance L between the user's eye and the concave lens is determined to be 80mm, and the focal length of the concave lens is 12mm, and the required projection area radius r2 is 100mm, the maximum emission angle α can be calculated using the following formula:

[0103]

[0104] The calculation yields α = 51°. The radius r1 of the required aperture 5 is then calculated using the following formula.

[0105]

[0106]

[0107] The final calculation yields r1 = 13mm, and the focal length of the concave lens is 12mm. Therefore, when the distance between the user's eye and the concave lens is L = 80mm, and the desired spot radius is r2 = 100mm, the maximum divergence angle of the concave lens is 51°, and an aperture stop 5 with a radius of 13mm needs to be selected.

[0108] in conclusion

[0109] Through the above three embodiments, the area of ​​the light emitted by the laser 1 that is finally irradiated onto the user's eye after passing through the concave lens can be directly changed to adapt to the training needs of users with different eyes. The light spot is completely irradiated onto the user's eye without any omissions or uneven irradiation, thereby improving the training effect and allowing the existing equipment to break through the limitations of the equipment itself to amplify the light spot used for training.

[0110] Example 4: A vision training device

[0111] The present invention provides a vision training device disclosed in one embodiment, such as Figure 1-3 The figure includes

[0112] A light source unit emits light over a certain area.

[0113] The light source unit is a laser 1, which emits approximately parallel light rays. Since the laser 1 is itself a light source and emits a nearly parallel laser beam, the cross-sectional area of ​​the emitted light beam is uncertain or may exhibit astigmatism. Therefore, an aperture 5 is provided to intercept the shape and area of ​​the laser beam, ensuring that the desired or required cross-sectional area of ​​the light beam is emitted, ultimately obtaining the magnified cross-sectional area of ​​the light beam. The main function of the aperture 5 is to intercept the cross-sectional area of ​​the light emitted by the laser 1. When the laser 1 emits parallel light rays with a radius of 6mm, the size of the aperture 5 determines how much of the light beam is intercepted. If the radius of the aperture 5 is 3mm, it will directly intercept the emitted laser light beam into parallel light rays with a radius of 3mm. In this embodiment, the interception device is not limited to an aperture 5; it can also be a baffle-like structure with a through-hole in the middle to allow light to pass through, capable of intercepting a certain area of ​​the laser light emitted by the laser. The outer surface of the laser is provided with a sleeve, and the aperture 5 is disposed on the end face of the sleeve and located in the output optical path of the laser 1. The sleeve prevents external natural light from being introduced when the laser 1 emits light, thus avoiding interference with the emitted light and reducing the intensity of the laser light emitted by the laser 1. This protects the laser light emission from being affected. The aperture 5 can be circular or square, because the shape of the aperture 5 determines the shape of the illuminated spot pattern. Since the light is to be irradiated onto the user's eyes, the shape presented to the user's eyes is not fixed, as long as it can cover the user's eyes. In this embodiment, the preferred solution is that the aperture 5 is circular. Other shapes, such as square or equilateral, are also acceptable, and this shape can be changed according to actual needs. Furthermore, the aperture 5 refers to a physical entity in an optical system that plays a role in limiting the beam. It can be the edge of a lens, a frame, or a specially designed perforated screen. Its function can be twofold: limiting the beam or limiting the size of the field of view (imaging range). In this embodiment, the purpose is to limit the range of the light beam. After the laser 1 emits approximately parallel light, the aperture 5 intercepts a certain area of ​​light and then illuminates the concave lens, which deflects and disperses the light into a large area of ​​light spot.

[0114] Optical element 2, please refer to Figure 3 The light emitted by the light source unit is deflected by the optical element, resulting in an exit angle greater than the incident angle. This also causes the light emitted by the light source unit to diverge after passing through the optical element, forming a large-area light spot. The area of ​​the light spot can generally be measured using the following method: Using the end face of laser 1 as a reference plane, a projection surface (such as a white plane) is set away from this reference plane. During testing, the projection surface is a white plane. In actual use, the projection surface is the area where the user's eyes are positioned. Please refer to [link to relevant documentation]. Figure 4After laser 1 is activated, the light spot projected onto the standard template is deflected by concave lens 31. This projection surface is as parallel as possible to the reference plane.

[0115] The optical element is a concave lens. In this embodiment, the concave lens 31 is thinner in the center and thicker at the edges, and the side closest to the laser 1 is curved, exhibiting a certain degree of curvature. However, this embodiment does not limit the structural shape of the concave lens. There are three possible designs for the concave lens 31: the contact surface of the treatment light is concave; the concave lens 31 is thick enough that both sides are concave, with the concave surface being the emission surface. Because the concave lens 31 has a certain diverging effect, it can magnify the light spot regardless of which side the concave surface is on. The concave lens 31 can be replaced according to different concave curvatures to change and adjust the area of ​​the light spot. This is one adjustment method. Alternatively, the size of the projected light spot can be adjusted according to the user's distance from the concave lens. This method is more direct and convenient than simply replacing the concave lens, and the user can choose different methods based on the actual situation.

[0116] A lens tube 32 is provided between the housing 3 and the light source unit to isolate external light interference. One end of the lens tube 32 is detachably connected to the housing, and the other end of the lens tube 32 is detachably connected to the housing 3. The laser 1 is located on one side of the lens tube 32, and the concave lens 31 is located on the other side of the lens tube 32. The laser 1 emits parallel light rays inside the lens tube 32, which pass through the concave lens 31 and then illuminate the pupil of the user's eye.

[0117] The working principle is as follows: A laser beam emitted by laser 1 is converted into a small area of ​​parallel light rays after passing through aperture 5. Aperture 5 is a physical entity in an optical system that limits the beam of light. It can be the edge of a lens, a frame, or a specially designed perforated screen. Its function can be twofold: limiting the beam or limiting the field of view (imaging range). When parallel light rays strike the concave lens, they are diverged by the lens and converted into a large area of ​​light spot, which then shines into the user's eye. When the parallel light ray has an incident angle of 0°, the concave lens deflects the outgoing light rays to a certain angle. This angle is determined by the different curvature and position of the concave lens. Because of the irregularity of the concave lens's curvature, the exit angle at each point will be different, but there is a uniform pattern. The closer to the center of the concave lens, the smaller the exit angle becomes. It is during this uniform divergence process that a large area of ​​light spot is formed. Compared to the incident light spot, the area of ​​the light will be larger, and the extent of this increase is determined by several parameters. The first is the distance between the eye and the concave lens. Since the light is scattered at an angle, the farther the projection surface is, the larger the area will be. Therefore, the first parameter is the distance between the projection surface and the concave lens. The second parameter is the curvature of the concave surface of the lens itself. The third factor is the size of the aperture 5. Since the aperture 5 intercepts part of the light from the laser 1, when the area of ​​the incident light is small, the resulting divergence area will be relatively small. However, the overall area of ​​the diverged light spot will be larger than the area of ​​the incident light spot.

[0118] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for changing the size of a therapeutic light source spot, characterized in that: include The light source unit is used to emit light; The optical element deflects the light emitted by the light source unit, making the exit angle of the light emitted by the light source unit greater than the incident angle, and causing the light emitted by the light source unit to diverge after being dispersed by the optical element, forming a large area of ​​light spot. Determine the focal length of the optical element, the initial emitted spot size of the light source unit, and the distance between the projection surface and the optical element. Then, calculate the radius of the spot that illuminates the projection surface after divergence using the following formula: α=tan -1 ( ); r2 = (L + f)tanα; α is the emission angle, r1 is the initial emitted light spot radius, f is the focal length of the optical element, and r2 is the actual light spot radius illuminating the projection surface; Alternatively, determine the actual radius of the light spot illuminating the projection surface, the initial size of the emitted light spot from the light source unit, and the distance between the projection surface and the optical element, then calculate the focal length of the optical element using the following formula: α=tan -1 ( ); f= -L; α is the emission angle, r1 is the initial emission spot radius, L is the distance between the projection surface and the optical element that needs to be set, r2 is the actual spot radius irradiated onto the projection surface, and f is the focal length of the optical element.

2. A vision training device, characterized in that: The method for changing the spot size of a therapeutic light source as described in claim 1 further includes: The control module allows the user to control the operation of the light source unit; The contact module is used to contact the user's eye area; The connection module is used to connect the light source unit and optical components.

3. A vision training device according to claim 2, characterized in that: The optical element is a concave lens; The light source unit is a laser, the control module is a circuit board, the laser is mounted on the circuit board, the circuit board is mounted on the housing, and an aperture is provided in the optical path of the laser; The contact module is a cover; The connecting module is a lens barrel; One end of the lens tube is connected to the housing, and the other end of the lens tube is connected to the cover. The laser is located on one side of the lens tube, and the concave lens is located on the other side of the lens tube or inside the lens tube. The laser emits parallel light rays inside the lens barrel, which pass through a concave lens and then illuminate the pupil of the user's eye.

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