Visual training device and equipment
By introducing optical elements such as light-diffusing plates and aperture stops into vision training devices, the problem of excessive laser beam focusing is solved, achieving uniform beam distribution in the fundus and improving safety, thus ensuring stable vision training results.
Patent Information
- Application Number
- CN202422582009.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-10-25
AI Technical Summary
In existing vision training devices, laser beams are prone to over-focusing, resulting in excessively high local power density, which increases the risk of retinal damage. Furthermore, the uneven distribution of spot size and power density affects the stability of treatment effects.
Optical elements such as homogenizers and aperture stops are used to control the uniformity and power density of the beam. The beam transmission direction and aperture are adjusted by the field stop to ensure that the beam forms a uniform spot on the fundus and reduce the local power density.
It improves the safety and effectiveness of vision training, reduces the risk of retinal damage, ensures uniform distribution of the light beam in the fundus, and enhances the stability and consistency of treatment effects.
Smart Images
Figure CN223474078U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vision training, and in particular to a vision training device and equipment, specifically including a device that controls a light beam to enter the eye through optical elements. It is a vision training device suitable for improving blood circulation in the fundus and preventing and alleviating myopia, and belongs to the field of optical therapy instruments. Background Art
[0002] With the widespread use of electronic products and increased usage time, the myopia rate among teenagers and adults is rising year by year, making the treatment and prevention of myopia a hot research topic in the field of medical devices. In recent years, many studies have shown that light of specific wavelengths has significant therapeutic effects on improving retinal blood circulation and controlling myopia. In particular, retinal irradiation with low-power lasers or LEDs can effectively promote the recovery of lesions and help alleviate further deterioration of myopia.
[0003] Eye diseases such as high myopia, glaucoma, optic neuropathy, retinal detachment, and macular degeneration can all lead to fundus lesions. Other systemic diseases such as hypertension, hyperlipidemia, kidney disease, diabetes, and central nervous system diseases can also cause fundus lesions. Once fundus lesions occur, without timely intervention and treatment, they can lead to decreased vision, visual field defects, distorted vision, and in severe cases, blindness. Fundus lesions caused by the above-mentioned factors are showing an increasing trend year by year. Current treatment methods include fundus photocoagulation, drug therapy, and surgical treatment.
[0004] Most fundus diseases lead to atrophy of the choroidal vessels and reduced blood flow to the fundus. This product proposes a novel physical therapy that uses low-intensity 650nm red light to irradiate the fundus, inducing a photochemical reaction in the retina. This reaction includes increasing cytochrome C oxidase activity, altering gene expression to regulate the mitochondrial respiratory chain, and increasing the biological activity of nitric oxide. Through these mechanisms, the 650nm red light increases the choroidal metabolic rate, improves fundus microcirculation, and enhances fundus blood flow, thus improving fundus diseases related to fundus blood flow.
[0005] Existing eye treatment devices, especially those used for myopia control, typically employ semiconductor laser diodes to emit laser beams. These devices utilize the unidirectional and highly focused nature of lasers to create an extremely small spot on the fundus after the beam passes through the eye's refractive system. However, due to the extremely small size of the emitting surface of the semiconductor laser, over-focusing of the beam can easily occur, resulting in excessively high local power density in the fundus and increasing the risk of retinal damage. Although some devices mitigate this risk by controlling the power entering the eye, current technology still falls short in ensuring the uniformity of the fundus spot size and precise control of power density distribution, potentially leading to unstable treatment outcomes.
[0006] To address the aforementioned issues, this product employs optical components such as a beam homogenizer to achieve a more uniform intensity distribution of the laser beam and reduce localized power density. Furthermore, by incorporating an aperture stop and a field stop, this product can precisely adjust the beam aperture and field of view entering the eye, thereby controlling the consistency of beam transmission direction. This ensures that most of the light passes through the pupil and enters the fundus, while reducing the amount of light reaching the sclera around the pupil, thus lowering the risks to eye health from long-term exposure and further guaranteeing treatment effectiveness and safety. Utility Model Content
[0007] The purpose of this invention is to provide a vision training device that improves the safety and effectiveness of training by precisely controlling the uniformity and power density of the light beam.
[0008] A vision training device, the device comprising:
[0009] A light source generating component used to emit a training beam;
[0010] A lens is used to focus a beam of light;
[0011] as well as
[0012] An aperture stop, located at the front of the lens, is used to adjust the aperture of the beam entering the viewing tube.
[0013] Furthermore, the light source generating component is a laser, and it also includes a light homogenizer disposed between the laser and the lens.
[0014] Furthermore, it also includes a field stop, which is set at the front end of the light homogenizer.
[0015] Furthermore, the laser, the homogenizer, the field stop, and the lens are all coaxially arranged along the optical axis of the device to ensure that the beam transmission direction is consistent.
[0016] Furthermore, the diameter of the light beam irradiated onto the cornea after the aperture stop is adjusted is 3mm to 5mm, and the light radiation power is no greater than 0.39mW.
[0017] Furthermore, it also includes a light source holder, which is used to mount the cylinder and the aperture stop, and a viewing tube is provided at one end of the light source holder.
[0018] Furthermore, the diameter of the aperture aperture of the aperture stop is not less than 0.15 mm.
[0019] Furthermore, the light source generating component is an LED emitter.
[0020] Furthermore, the diameter of the light spot formed when the light beam after the aperture stop is adjusted and illuminates the macula of the fundus is not less than 0.1 mm.
[0021] A device that applies any of the above-mentioned vision training devices, the device including an eye mask, wherein the diameter of the light beam at the light-emitting position of the eye mask is 3mm to 5mm and the light radiation power is not more than 0.39mW.
[0022] Beneficial effects
[0023] The beneficial effects of this invention are as follows: By introducing an aperture stop, the safety and effectiveness of the vision training device are significantly improved. The aperture stop allows for precise control of the beam size entering the eye, ensuring that the beam forms a uniform and suitable spot on the fundus after passing through the eye's refractive system. This avoids excessive local power density caused by over-focusing of the beam, reducing the risk of retinal damage. Furthermore, the aperture stop in this invention can be flexibly adjusted according to the user's vision, ensuring the stability of beam transmission during training, thereby improving the safety and consistency of the training effect.
[0024] Compared to traditional equipment, this invention not only reduces the potential safety hazards associated with laser devices, but also further optimizes the uniformity of the laser beam through a beam homogenizer, allowing the laser beam to be distributed more evenly across the fundus region. This effectively controls the size and power density of the laser spot, ensuring the effectiveness of vision training while reducing the probability of damage to fundus tissues.
[0025] In summary, this invention achieves a dual improvement in the safety and effectiveness of the vision training device by precisely controlling the transmission process of the light beam, especially by utilizing the setting of the aperture stop. It overcomes the shortcomings of the prior art and provides a more efficient and safer vision training solution. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the vision training device of this utility model.
[0027] Figure 2 This is a schematic diagram of the vision training device of this utility model.
[0028] Figure 3 This is a schematic diagram showing the relationship between the aperture diameter and the fundus spot size in this utility model.
[0029] Figure 4 This is a schematic diagram of the simplified eyeball as an optical system in this utility model.
[0030] Figure 5 This is a schematic diagram of the aperture stop in this utility model. DETAILED DESCRIPTION
[0031] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0032] Example 1: A vision training device, such as Figure 1-5 As shown, it includes the following components: laser 1, light homogenizer 2, field stop 3, lens 4, aperture stop 5, light source holder 6, and viewing tube 9.
[0033] Laser 1 is mounted at the rear end of light source base 6 and is used to emit a training beam. A 650nm laser diode is preferably used to provide a stable beam output. The laser is fixedly connected to light source base 6 by screws or other fasteners to ensure stable positioning and accurate beam transmission direction.
[0034] A beam homogenizer 2 is positioned in front of the laser 1 and coaxially aligned with it. It homogenizes the laser beam, converting it into a uniform beam with a Lambertian distribution. This reduces the potential harm to the user's eyes caused by excessively high local beam intensity. The beam homogenizer is fixed within the light source holder 6 via a connector, ensuring its stable position and alignment with the beam transmission path.
[0035] The field stop 3 is located immediately behind the homogenizer 2 and in the middle of the light source base 6. It is used to limit the field of view of the light beam, reduce unnecessary scattered light interference to the user's eyes, and improve the effectiveness and safety of vision training. The field stop is connected to the homogenizer 2 by a fixing component to ensure its accurate position and coaxiality with the direction of the light beam.
[0036] Lens 4 is positioned in front of the field stop 3 and installed within the aperture stop 5. Its function is to focus the light beam for effective vision training. Lens 4 is coaxially arranged with laser 1, beam homogenizer 2, and field stop 3. By adjusting the focal length, it can adapt to the eye characteristics of different users to achieve the best training effect. The lens is fixed within the light source mount 6 by a lens mount to ensure the accuracy of its relative position.
[0037] The cylindrical body 7 is a separate part from the visual tube in the vision training device. Its main function is to house and support the beam homogenizer 2, ensuring the stability of the beam homogenizer along the beam transmission path. The cylindrical body has a hollow cylindrical structure, and its inner diameter and length are precisely calculated to ensure that the correct position of the beam homogenizer is aligned coaxially with the beam, thereby achieving beam homogenization. The cylindrical body is connected to other optical components through its connector to the light source base 6, ensuring the optical axis consistency and beam transmission accuracy of the entire system.
[0038] Aperture stop 5 is mounted in front of lens 4. In the optical system consisting of aperture stop 5, the user's pupil, the user's refractive system, and the user's retina, aperture stop 5 and the user's retina are conjugate. Therefore, adjusting the size of aperture stop 5 can change the size of the light spot on the user's retina. The aperture stop is integrally formed with lens 4 or connected via a fixed connector to ensure stable and adjustable position. Aperture adjustment can be achieved by replacing aperture stops of different sizes to meet the personalized needs of different users, improving the safety and effectiveness of vision training.
[0039] The sight tube 9 is located at the front end of the light source base 6 and is connected to the light source base 6 via a threaded connection, ensuring stable beam transmission to the user's eye. The inner surface of the sight tube is treated with anti-reflection coating to reduce beam reflection loss on the inner wall and maintain beam power intensity. The length and diameter of the sight tube are precisely calculated to ensure that no significant scattering or diffraction occurs when the beam passes through, guaranteeing focusing effect and beam stability.
[0040] All components of the optical system are coaxially arranged along the optical axis. The light source mount 6 is used to fix the above components. The structural design ensures the precise alignment of each optical component, ensuring the stability and consistency of the beam during transmission and focusing. The light source mount is made of lightweight, high-strength material, which has strong vibration resistance and avoids optical axis misalignment caused by slight movement of the device.
[0041] In use, the light beam is emitted from laser 1, homogenized by homogenizer 2, passes through field stop 3, and reaches lens 4. The beam is focused by lens 4, adjusted by aperture stop 5, and finally enters the viewing tube 9, passes through the user's pupil, and is projected onto the user's retina by the user's eye optical system. By adjusting aperture stop 5, the size of the light spot on the retina can be precisely controlled, allowing for personalized vision training according to the user's needs. Specifically, lens 4 is positioned within the aperture stop, with aperture stop 8 located at the front of lens 4, used to adjust the size of the light beam entering the user's fundus, thereby controlling the size of the light spot on the retina.
[0042] The innovation of this device lies in the placement of an aperture stop 5 at the front end of lens 4, enabling the Lambertian light source, field stop 3, lens 4, aperture stop 5, user pupil, user refractive system, and user retina to form a Kohler illumination system. The structure of aperture stop 5 is as follows: Figure 5 As shown, the aperture is adjusted by replacing aperture stops of different sizes. Depending on the treatment or training needs, the user can replace the aperture stops with those of different opening diameters to adjust the beam size. Replacing the aperture stop is a simple and effective way to precisely control the beam's illumination range, improving the effectiveness and safety of treatment or training. In this system, the aperture stop 5 and the user's retina are in a conjugate position, allowing the size of the light spot on the user's retina to be changed by limiting the size of the aperture stop 8, while also making the light spot on the user's retina more uniform. Furthermore, the Lambertian light source in the Kohler illumination system described above is simulated by a combination of laser 1 and a homogenizer 2, ensuring the effectiveness of the equipment while also improving the safety of vision training.
[0043] Furthermore, this embodiment also provides a solution using an LED light source instead of a laser. The LED light source itself is a Lambertian light source, emitting a beam with good uniformity, providing a uniform light spot without the need for an additional homogenizer. The device using an LED light source eliminates the homogenizer 2, simplifying the optical system. After passing through the field stop 3, the LED light source is focused by the lens 4, adjusted by the aperture stop 5, and finally enters the viewing tube 9 and passes through the user's pupil. It is then projected onto the user's retina by the user's eye optical system, forming a stable light spot size. This solution reduces manufacturing costs while maintaining good optical performance.
[0044] In summary, the vision training device of this embodiment has a compact structure and reasonable design, and can adapt to the needs of different users. By adjusting the aperture stop, it provides personalized vision training programs, effectively improving the safety and effectiveness of training.
[0045] In this embodiment, the size of the light spot on the retina after aperture diaphragm adjustment is calculated in detail to verify the rationality and effectiveness of the optical design. According to ANSI Z80.36-2021 (full name: American National Standard: Protection Against Light Hazards from Ophthalmic Instruments, approved by the American National Standards Institute (ANSI) on April 9, 2021, and published by the Vision Council on July 14, 2021), the size of the retinal light spot can be obtained through parametric measurement techniques, specifically as follows: Figure 4 The eyeball is considered a complex optical system, primarily composed of the cornea, anterior chamber, lens, and vitreous humor. Their combined action forms the refractive system, focusing light onto the retina. In a simplified model, the eye's refractive system can be represented by a nodal distance of 7.08 mm from the corneal anterior end and 17.05 mm from the retina. The nodal point is considered the optical center, and any light ray passing through it is not refracted. This simplified model is used to approximate optical imaging to understand how the beam forms an image in the fundus and to adjust the size of the training spot. The relationship between the spot size and the aperture stop diameter can be calculated using similar triangles. Assuming AB is the diameter of the anterior aperture stop, and N is the optical center of the simplified eye model's optical system, where light rays passing through this point are not refracted, the light reflected from the diameter AB of the anterior aperture stop forms an inverted image on the retina at the nodal point, similar to the imaging of a convex lens. Based on the proportional relationship of corresponding sides of similar triangles, we can obtain:
[0046] BN = L + 7.08
[0047] Nb = 17.05
[0048]
[0049] The above formula shows that the size of the fundus light spot is directly proportional to the aperture stop diameter. Where L is the distance from the aperture stop to the retina; d is the diameter of the aperture stop in front of the lens; D is the diameter of the fundus retinal imaging spot; BN is the distance from the aperture stop to the eye's refractive system node; and BN is the distance from the eye's refractive system node to the retinal image.
[0050] In this embodiment, the size of the retinal imaging spot can be controlled by adjusting the position of the aperture stop, i.e., the BN value, and the aperture stop size d.
[0051] Parameter setting and calculation: Different distances from the aperture to the front of the eye were set in the experiment, and the corresponding spot sizes were calculated. Table 1 lists the calculated parameters and results.
[0052]
[0053]
[0054] Table 1
[0055] The calculations above show that as the distance between the aperture stop and the eye increases, the diameter of the light spot also gradually increases. This change is because the distance between the aperture stop and the eye's refractive system directly affects the divergence of the light beam entering the retina. Specifically:
[0056] In practice, the BN value (i.e., the position of the aperture stop) can be determined first based on the actual situation. Then, the size of the fundus spot can be determined by selecting the aperture stop size (i.e., the aperture size). If multiple aperture stops of different sizes are not available, the size of the fundus spot can also be determined by adjusting the position of the only available aperture stop (i.e., adjusting the BN value).
[0057] Through this embodiment, users can conveniently conduct vision training at home or in a clinic. The device has good operability and adaptability, and can meet the vision training needs of different users and in different usage environments. This embodiment significantly improves the effect of vision training by precisely controlling the size of the light spot and the uniformity of the light beam, providing users with a safe and effective vision improvement solution.
[0058] In this embodiment, the laser, a homogenizer, a field stop, a lens, an aperture stop, a light source mount, and an eyepiece are all coaxially arranged along the optical axis. In use, the light beam is emitted from the laser, homogenized by the homogenizer, passes through the field stop, reaches the lens, is focused by the lens, and after adjustment by the aperture stop, finally enters the eyepiece and is projected onto the retina. By adjusting the aperture stop, the size of the light spot can be varied within a wide range to accommodate the vision training needs of different patients.
[0059] Example 2: A device for vision training, such as... Figure 2 As shown, when using this device for vision training, the eye mask 10 is first aligned with the user's eyes, and the laser beam is activated. The beam is first homogenized by a beam homogenizer, then its field of view is limited by a field stop, and finally focused by a lens. As the beam passes through the aperture stop, the aperture stop precisely adjusts the beam's aperture, thereby controlling the size of the final spot of light illuminating the fundus. The adjustment process can be flexibly adjusted according to the user's specific needs to achieve personalized vision training.
[0060] In this embodiment, to verify the beam power and diameter at the light-emitting point of the device's eyecup 10, and to ensure that the beam enters the fundus through the pupil as much as possible while avoiding excess light illuminating the scleral area around the pupil, the following testing methods and optimized designs were adopted:
[0061] Methods for testing beam power and diameter:
[0062] First, a piece of white paper is placed at the light-emitting point of the goggles to capture the light spot formed after passing through the light source and lens system. When the light beam shines on the white paper, the resulting light spot is the diameter of the light beam at the emission point. By measuring the diameter of this light spot, the size range of the light beam can be directly obtained, thus confirming whether it is within the designed 3 mm to 5 mm range. Furthermore, by combining this with an optical power meter, the power density of the light beam can be measured to ensure that the beam power is within a safe and effective range.
[0063] This testing method is simple and intuitive, effectively reflecting the actual size and power of the light beam at the light source of the eye mask, providing an accurate reference for adjusting the optical system of the device. By adjusting the parameters of the light source or lens system, the diameter and power density of the beam can be further optimized to ensure that it meets the expected design requirements and achieves the desired therapeutic or training efficacy.
[0064] An optimized design allows the light beam to enter the fundus through the pupil:
[0065] To ensure that as much light beam as possible enters the fundus through the pupil and to minimize excess light reaching the sclera to avoid potential lesion risks, the device has undergone the following optimized design in terms of beam power and size at the light exit point:
[0066] Precise adjustment of beam diameter and power: By adjusting the power output of the light source and the optical parameters of the lens, the beam diameter is matched as closely as possible to the pupil size, while the power remains within a safe range. This ensures that most of the beam effectively passes through the pupil and reduces scattered light from reaching the sclera around the pupil, thereby reducing the risk of eye health problems caused by prolonged light exposure.
[0067] Optimized design of optical components: By introducing aperture stops and field stops, the divergence angle and illumination range of the light beam can be controlled. Precise adjustment of these components ensures a consistent beam transmission direction, reducing unnecessary light dispersion into the scleral area and thus lowering the risk of scleral irritation or lesions caused by light exposure.
[0068] Optimization of beam uniformity and intensity distribution: To ensure that the beam entering the fundus achieves effective treatment or training without causing excessive strain on the eyes, the device has specifically optimized the beam power distribution. By controlling the uniformity and intensity of the beam at the output point, the irradiation effect of the beam in different areas can be effectively balanced, ensuring the safety and comfort of the user when using the device.
[0069] Through these measures, the optimized design of the light-emitting part of the eye mask in this embodiment not only ensures centralized control of beam power and diameter, but also minimizes the impact on eye health, especially in the case of long-term use, effectively preventing potential lesions caused by light shining on the sclera area.
Claims
1. A vision training device, characterized in that, The device includes: A light source generating component used to emit a training beam; A lens is used to focus a beam of light; as well as An aperture stop, located at the front of the lens, is used to adjust the aperture of the beam entering the viewing tube.
2. The vision training device according to claim 1, characterized in that, The light source generating component is a laser, and it also includes a light homogenizer disposed between the laser and the lens.
3. The vision training device according to claim 2, characterized in that, It also includes a field stop, which is set at the front of the light homogenizer.
4. The vision training device according to claim 3, characterized in that, The laser, homogenizer, field stop, and lens are all coaxially arranged along the optical axis of the device to ensure that the beam transmission direction is consistent.
5. The vision training device according to claim 1, characterized in that, The aperture stop is integrally formed with the lens or fixed by a fixing connector.
6. The vision training device according to claim 1, characterized in that, It also includes a light source holder, which is used to mount the cylinder and the aperture stop, and a sight tube is provided at one end of the light source holder.
7. The vision training device according to claim 1, characterized in that, The diameter of the aperture aperture of the aperture stop is not less than 0.15 mm.
8. The vision training device according to claim 1, characterized in that, The light source generating component is an LED emitter.
9. The vision training device according to claim 1, characterized in that, The diameter of the light spot formed when the light beam after the aperture stop is adjusted and illuminates the macula of the fundus is not less than 0.1 mm.
10. A device, employing the vision training device according to any one of claims 1-9, characterized in that, The device includes an eye mask, and the diameter of the light beam at the light-emitting position of the eye mask is 3mm to 5mm, and the light radiation power is no greater than 0.39mW.