Light feeding device

Abstract

The present disclosure discloses a phototherapy device, comprising: a red light source operating to generate red light for irradiating a user's fundus; and a projection light path operating to receive the red light and project the red light to the user's fundus, wherein the projection light path comprises a diffractive optical element device and a fixation light source, wherein the diffractive optical element operates to directionally deflect the red light so that the projection light path projects a light spot at a predetermined area of the user's fundus; and the fixation light source operates to irradiate the projection light path for guiding the user to fixate the center of the light spot. Through the scheme of the present disclosure, personalized phototherapy can be provided and the user is advantageously guided to accurately fixate the center of the light spot, thereby achieving efficient red light irradiation and effectively inhibiting axial elongation.

Description

Technical Field

[0001] This disclosure generally relates to the fields of optical projection and imaging technology. More specifically, this disclosure relates to a light-emitting device. Background Technology

[0002] Axial length elongation is one of the main factors contributing to myopia, especially in adolescents who are in a period of rapid growth. Studies have shown that direct irradiation of the retina with 650 nanometers (nm) long-wavelength red light can effectively inhibit the growth of axial length. Therefore, irradiating the retina with red light has a positive impact on myopia prevention and control in adolescents.

[0003] Currently, there are several phototherapy devices on the market for myopia prevention. These devices typically employ a binocular structure, with each binocular corresponding to one eye. Through a mechanical design, the distance between the binoculars can be adjusted to fit the position of the eyes, thereby ensuring that the red light images seen by both eyes overlap. This is for illustrative purposes only. Figure 1 The basic optical path structure of this type of light-emitting device in the case of a single tube is shown. For example... Figure 1 As shown, red wavelength light, after being emitted from a red light source, passes through a light-transmitting element and enters the human eye, illuminating the retina. Regarding the selection and setting of the red light source, LED or laser light sources with wavelengths around 650nm are typically chosen. Furthermore, the light-transmitting element can be a transparent protective window plate or a light-transmitting lens to further converge or diverge the light beam emitted by the light source.

[0004] The working principle of the red light irradiation in the aforementioned phototherapy device lies in the strong penetrating power of red light in the 650nm wavelength band. After penetrating the retina, the red light simultaneously acts on the choroid. Due to the warming effect of 650nm red light, it opens the bottleneck-like narrowing at the opening of the arterioles in the choroidal lobules, increasing blood flow into the lobules and thus increasing microcirculatory blood volume. Because the choroid thickens while the sclera is not hypoxic, the thinned choroid can be restored to its normal thickness, providing sufficient oxygen to the sclera and improving blood circulation in the fundus, thereby preventing further progression of myopia. In addition, 650nm red light can stimulate the secretion of dopamine by retinal epithelial pigment cells, effectively inhibiting excessive axial elongation.

[0005] Although effective in myopia control, current phototherapy techniques have some significant drawbacks. Specifically, commonly used red light sources, whether LEDs or laser diodes, are essentially point light sources, resulting in a small luminous area. When looking directly at the light source or observing the image after it has been filtered through a lens, the human eye adjusts its fovea to face the light source itself, and sees a bright circular spot at the center. Figure 2As shown in the diagram, when the human eye adjusts to a position of clear vision to make the image of the light source clearer, the size of the central bright spot decreases, and the brightness of the bright spot further increases. This increases visual stimulation to the human eye and thus causes discomfort.

[0006] Besides the small size of the light source causing strong visual stimulation when viewed directly, this approach also has a negative impact. Specifically, when more red light energy is concentrated in the center of the macula, the red light energy in the surrounding macula is very weak. This results in uneven illumination stimulation of the choroid in the macula, leading to uneven heating and stimulation of the choroid, ultimately affecting the actual effect of red light irradiation in inhibiting axial elongation.

[0007] In view of this, there is an urgent need to provide a solution for light therapy of the human eye, so as to provide targeted or personalized red light irradiation to the fundus, thereby effectively inhibiting axial elongation. Summary of the Invention

[0008] In order to at least address one or more of the technical problems mentioned above, this disclosure proposes a light-enhancing scheme for myopia prevention and control in several embodiments to achieve efficient red light irradiation.

[0009] Specifically, this disclosure provides a light-adjusting device for myopia prevention and control, characterized in that it includes: a red light source, operable to generate red light for illuminating the fundus of a user; and a projection light path, operable to receive the red light and project the red light onto the fundus of the user, wherein the projection light path includes a diffractive optical element and a fixation light source, wherein the diffractive optical element is operable to deflect the red light so that the projection light path projects a light spot in a predetermined area of ​​the fundus of the user; and the fixation light source is operable to illuminate the projection light path to guide the user to fixate on the center of the light spot.

[0010] In one embodiment, the predetermined region of the user's fundus includes a predetermined region of the macula, wherein the predetermined region is divided according to the angle of the macula.

[0011] In one embodiment, the projection optical path includes a conjugate lens group arranged between the emitting end of the diffractive optical element and the user's fundus, such that the position where the diffractive optical element causes the red light to deflect in the direction forms an optical conjugate with the position of the user's pupil.

[0012] In another embodiment, the conjugate lens assembly includes a first conjugate lens and a second conjugate lens, wherein the front focal point of the first conjugate lens is located at the diffractive optical element device, the rear focal point of the first conjugate lens coincides with the front focal point of the second conjugate lens, and the rear focal point of the second conjugate lens is located at the user's pupil.

[0013] In another embodiment, the rear focal point of the first conjugate mirror and the front focal point of the second conjugate mirror coincide to form an intermediate image plane, and the projection optical path includes: a first beam splitter, which is arranged between the first conjugate mirror and the intermediate image plane, and is used to receive the light beam from the fixation light source to achieve optical conjugation between the fixation light source and the user's pupil position.

[0014] In one embodiment, the rear focal point of the first conjugate lens and the front focal point of the second conjugate lens coincide to form an intermediate image plane, and the projection optical path includes a second beam splitter, which is arranged between the intermediate image plane and the second conjugate lens and is used to receive the light beam from the fixation light source to achieve optical conjugation between the fixation light source and the user's pupil position.

[0015] In one embodiment, the light-gathering device further includes a collimating lens disposed between the red light source and the diffractive optical element device, which is used to converge and collimate the red light emitted by the red light source.

[0016] In another embodiment, the light-emitting device further includes a switching mechanism, which is operable to switch one of the diffractive optical elements with corresponding micro / nano structures into the projection optical path according to different projection requirements.

[0017] In yet another embodiment, the different projection requirements correspond to light spots with different preset patterns, and the light spots with different preset patterns are generated based on diffractive optical element devices with different micro / nano structures.

[0018] In one embodiment, the preset pattern includes a circular pattern or an annular pattern, wherein the annular pattern includes an annular pattern with uniform color, an annular pattern with color gradually lightening from the outside to the inside, an annular pattern composed of multiple concentric circles with different radii, an annular pattern composed of multiple line segments arranged radially around the same center, an annular pattern composed of a grid pattern, or an annular pattern composed of a dot matrix.

[0019] In one embodiment, the light-adjusting device further includes a drive mechanism operable to perform at least one of the following drives to achieve refractive compensation for the user's eye by focusing: driving the second conjugate mirror to move relative to an intermediate image plane formed at the front focal point of the second conjugate mirror; and driving the red light source, the first conjugate mirror, the diffractive optical element, the fixation light source, the first or second beam splitter, and / or the collimating mirror to move relative to an intermediate image plane formed at the front focal point of the second conjugate mirror.

[0020] In one embodiment, the light-emitting device further includes a fixed projection mirror, which is operated to project a light beam from the fixed light source onto the intermediate image plane in a lenticular manner, and the drive mechanism is operated to drive the first conjugate mirror and the diffractive optical element device to move relative to the intermediate image plane formed at the front focal point of the second conjugate mirror.

[0021] Using the aforementioned light-emitting device for myopia control, this disclosed embodiment utilizes a diffractive optical element (“DOE”) to deflect incident red light while maintaining its laser directionality, thereby projecting a light spot onto a predetermined area of ​​the user's retina. A fixation light source is then introduced to guide the user's gaze at the center of this light spot. Thus, the disclosed solution can guide the user to accurately focus on a personalized or customized light spot. When the personalized light spot is a ring pattern, i.e., when a ring-shaped light spot is formed, the disclosed solution facilitates the formation of a ring-shaped red light energy distribution on the user's retina that avoids a specific peripheral macula, achieving efficient red light irradiation and effectively suppressing axial elongation.

[0022] In some embodiments, by utilizing a conjugate lens group (the 4F system described later), the light energy from all angles generated by DOE diffraction can be conjugated (i.e., "projected") onto the pupil and enter the eye, thereby ensuring the power of the light entering the eye. Furthermore, by controlling the magnification of the relevant lens groups in the projection path and the design of the diffraction angle of the DOE device, the scheme disclosed herein can also achieve precise control of light entering specific areas of the eye.

[0023] Furthermore, in some embodiments, by utilizing a driving mechanism, the movement of relevant devices in the optical device disclosed herein can be driven, thereby achieving refractive compensation of the human eye and determination of the basic refractive power, which in turn helps in the detection of refractive power. Attached Figure Description

[0024] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0025] Figure 1 The optical path diagram of an existing light-emitting device is shown;

[0026] Figure 2 The visual effect and energy distribution of red light from existing light-emitting devices are shown.

[0027] Figure 3 The optical path diagram of the light-emitting device for myopia prevention disclosed herein is shown.

[0028] Figure 4 The red light visual effect and energy distribution diagram of the light-emitting device according to an embodiment of this disclosure are shown;

[0029] Figure 5 A schematic diagram showing the focal position of the light-emitting device according to an embodiment of this disclosure is provided.

[0030] Figure 6 A schematic diagram of the optical structure of a light-emitting device according to an embodiment of this disclosure is shown;

[0031] Figure 7 A schematic diagram of the optical structure of a light-emitting device according to another embodiment of this disclosure is shown;

[0032] Figure 8 A schematic diagram of the axial spacing of the light-emitting devices according to embodiments of this disclosure is shown;

[0033] Figure 9a A schematic diagram illustrating the adjustment of focus to achieve refractive power compensation of the human eye according to one embodiment of this disclosure is shown;

[0034] Figure 9b A schematic diagram illustrating the adjustment of focus to achieve refractive power compensation of the human eye, according to another embodiment of this disclosure, is shown;

[0035] Figure 9c A schematic diagram illustrating how adjusting the focus to achieve refractive power compensation of the human eye is shown in yet another embodiment of this disclosure;

[0036] Figure 10 A schematic diagram of the optical structure of a switchable DOE light-emitting device according to an embodiment of this disclosure is shown; and

[0037] Figure 11 Various exemplary diagrams of the annular light spots of embodiments of this disclosure are shown. Detailed Implementation

[0038] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0039] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0040] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0041] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0042] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings. Exemplary application scenarios

[0043] Existing phototherapy devices typically employ, for example Figure 1 The basic optical path structure shown does not provide ideal light-giving effect for the human eye. Through analysis and research, the inventors discovered that the key factor affecting the light-giving effect of existing phototherapy devices lies in the overly concentrated and uneven distribution of the light source energy in the human eye. As described in the background section, the light-emitting area of ​​the light source in phototherapy devices is relatively small. When looking directly at the light source or observing the image of the light source after it has been transformed by a lens, the human eye will adjust its fovea to face the light source itself, and thus see... Figure 2 The image shown is a bright circular spot with a high central brightness. When the human eye adjusts to a position of clear vision to make the image of the light source clearer, the size of the central bright spot decreases, and the brightness of the bright spot further increases, increasing visual stimulation and causing eye discomfort. Furthermore, the energy of the light source is more concentrated in the center of the macula of the human eye, while its distribution in the peripheral macula is weaker. Therefore, uneven illumination stimulation of the choroid in the macula leads to uneven heating and stimulation of the choroid, ultimately affecting the actual effect of red light irradiation on inhibiting axial elongation.

[0044] To this end, the inventors discovered through research that an innovative light-emitting device can be constructed that can project a light spot onto a predetermined area under the user's eye and make it easy for the user to correctly focus on the light spot, thereby achieving efficient red light irradiation and effectively inhibiting axial elongation.

[0045] Exemplary phototherapy device solution

[0046] In view of this, the present disclosure provides a light-emitting device that uses a DOE device to deflect incident red light at an angle while maintaining its laser directionality, thereby projecting a light spot onto a predetermined area of ​​the user's retina. A fixation light source is simultaneously introduced to guide the user's gaze at the center of the light spot. Specifically, in some embodiments, the micro / nano structure of the DOE device can be changed according to projection requirements, thus providing personalized light spots with different preset patterns. In other words, the present disclosure, through the innovative introduction of a DOE device, can achieve precise control of light-emitting operations in specific areas. To achieve flexible and varied light-emitting illumination, the present disclosure can also utilize the aforementioned switching mechanism to switch between multiple DOE devices, thereby quickly obtaining personalized light spots with preset patterns. In one implementation scenario, the present disclosure can use a DOE device to provide a ring-shaped light spot with a customized pattern. Thus, the present disclosure can achieve a ring-shaped energy distribution of red light in a specific peripheral macula that avoids the fovea centralis.

[0047] In scenarios where the personalized light spot is circular, the disclosed solution can provide uniform red light energy distribution to the entire macula. In scenarios where the personalized light spot is annular, the disclosed solution can guide the user to accurately focus on the annular light spot, facilitating the formation of a specific peripheral red light energy distribution around the macula that avoids the fovea, thereby achieving efficient red light illumination and effectively suppressing axial elongation. Furthermore, as described later, the fixation light source disclosed can be configured according to different application scenarios and / or user preferences. For example, it can be positioned at different points in the projection light path or set to emit different colors of light, thus enabling flexible light path arrangements and diverse user experiences.

[0048] Figure 3 A schematic diagram of the optical path of a light-adjusting device for myopia control, according to an embodiment of this disclosure, is shown. Figure 3 As shown, the light-giving device 301 may include a red light source 302 and a transmission light path, which schematically includes a DOE (Diffractive Optical Element) device 303 and a fixed light source 304. From the context, it will be understood that the projection light path disclosed herein can be modified by adding additional optical devices according to application requirements, constructing an optical path suitable for the innovative principles of this disclosure, or altering the exemplary optical path structure of this disclosure, and these modifications still fall within the protection scope of this disclosure. Furthermore, to clearly illustrate the optical path principle of the light-giving device, Figure 3 The image also schematically shows the user's eye (or fundus) 305.

[0049] For ease of understanding, Figure 3The diagram further exemplifies the structure of the human eye's fundus. Specifically, it shows the angular distribution of the macular region of the retina. For example, the entire macula has an angular distribution of 15 degrees; the peripheral macula has an angular distribution of 8 degrees; and the fovea has an angular distribution of approximately 5 degrees. Based on this angular distribution, the micro / nano structure of the DOE device can be customized to generate a light spot corresponding to the specific angular distribution region of the aforementioned macular region when introduced into the projection optical path disclosed herein. Customization of the DOE device's micro / nano structure falls within the scope of prior art. To avoid unnecessary confusion regarding the disclosed solution, this application will not describe it in detail.

[0050] During phototherapy, the aforementioned red light source 302 operates to generate red light for illuminating the user's fundus. In some implementation scenarios, the red light source 302 may employ a laser diode or other electronic devices capable of generating a coherent light source. It should be noted that this disclosure does not limit the specific type of red light source; it can be selected according to actual needs.

[0051] In application, the aforementioned projection optical path can be operated to receive red light and project it onto the user's retina. Specifically, the projection optical path disclosed herein may include a DOE device 303 and a fixation light source 304. In one embodiment, based on the physical characteristics and function of the DOE device 303, it can be precisely operated to deflect the aforementioned red light so that the projection optical path can project a ring-shaped light spot onto the user's retina 305. For this purpose, for example, a specific directional deflection of the red light can be obtained by processing the micro / nano structure of the DOE device to meet specific requirements. Furthermore, the shown fixation light source 304 can be operated to illuminate the projection optical path to guide the center of the fixation spot. Specifically, when the fixation light source 304 acts in the projection optical path, it can generate a fixation point at the center of the light spot to guide the human eye to focus on that fixation point. In some embodiments, the fixed-view light source 304 may be the same light source as the red light source 302, or it may be a light source of a different color than red light, such as green or blue, as described above, so that the human eye can more easily focus on the center of the ring-shaped light spot and obtain a user experience similar to its preference.

[0052] For illustrative purposes only, in Figure 4The diagram illustrates the energy distribution of a ring-shaped light spot with a fixation point. The fixation light source acts in the projection light path to form a light spot in the center of the ring area (the center of the fovea in the macula) for fixation function. Its energy cross-sectional distribution is shown as curve 401. It can be seen that when the user fixates on this ring-shaped light spot, they can focus on the center of the ring-shaped light spot under the guidance of the fixation light source. At this time, the ring-shaped light spot projected onto the user's fundus 305 can avoid the fovea and be evenly distributed in the peripheral macula, as shown by curve 402. Therefore, efficient red light illumination can be achieved, while avoiding energy concentration at the fovea that could stimulate vision. Furthermore, the ring-shaped light spot with its energy distribution around the periphery can provide uniform illumination stimulation to the macula, thus ensuring a more uniform heating effect and stimulation of the choroid, thereby achieving effective phototherapy for the human eye. It can be understood that a circular light spot can provide uniformly distributed red light energy illumination to the entire macula.

[0053] Figure 5 A schematic diagram showing the focal position of the light-emitting device according to an embodiment of this disclosure is provided.

[0054] In one exemplary application, diverging red light generated by a red light source (e.g., a red laser source) is collimated by a collimating lens and output, illuminating a DOE device. After exiting the DOE device, the red light enters a 4F optical system composed of a first conjugate mirror and a second conjugate mirror, and is projected by this 4F optical system onto a predetermined area of ​​the user's fundus (e.g., a specific angular distribution area in the macula). Specifically, as... Figure 5 As shown, in the 4F system, the front focal point of the first conjugate mirror is located at the diffractive optical element (DOE), and the rear focal point of the first conjugate mirror coincides with the front focal point of the second conjugate mirror, which is located at the user's pupil. The front focal point of the first conjugate mirror is located at the DOE, which is the position where the red light generates its angular distribution. Since the rear focal point of the first conjugate mirror coincides with the front focal point of the second conjugate mirror, the red light deflected by the DOE generates a converging intermediate image plane at this focal point, resulting in a predetermined pattern (such as a circle or ring) energy distribution. This arrangement aims to make the position where the DOE deflects the red light optically optically conjugate with the position of the human pupil, ensuring that all light generated by the DOE enters the pupil and that the energy spatial distribution of the intermediate image plane is optically conjugate with the fundus of the eye, projecting the energy distribution of the intermediate image plane onto the retina.

[0055] As can be seen, by using a DOE device to deflect incident red light at an angle corresponding to a predetermined area of ​​the fundus while maintaining the laser's unique directionality, and combined with the subsequent 4F system, the disclosed scheme can conjugate the light energy at all angles generated by the DOE device diffraction to the pupil and enter the human eye, thereby effectively ensuring the light power entering the eye and achieving myopia prevention and control effects that cannot be achieved by existing light-emitting devices.

[0056] As mentioned above, the disclosed solution can also achieve precise control over the illumination area of ​​the human eye by controlling the magnification of the 4F system and the design of the diffraction angle of the DOE device. To this end, in some embodiments, the diameter of the collimated red light spot is set to D1, the maximum deflection half-angle achievable by the DOE device is set to θ1, the focal length of the first conjugate mirror in the 4F system is f1, the focal length of the second conjugate mirror is f2, the pupil diameter is D2, and the maximum angle between the red light entering the pupil and the optical axis is θ2. Based on this setting, the conjugate magnification of the 4F system disclosed is M = f2 / f1, thus establishing the following correspondence: D2 / D1 = M, θ1 / θ2 = M. Based on this, for a given fundus illumination angle range θ2 and pupil diameter D2, the diffraction angle θ1 of the matching DOE and the diameter D1 of the collimated light spot can be selected according to the focal length ratio of the 4F system. At the same time, different collimated spot diameters can be achieved by selecting different divergence angles of red light sources (such as red laser diodes) and focal lengths of collimating lenses.

[0057] Figure 6 A schematic diagram of the optical structure of a light-emitting device according to an embodiment of this disclosure is shown. It will be understood that... Figure 6 yes Figure 3 This is a specific implementation of a central optical device. Therefore, the preceding text combines... Figure 3 The relevant detailed descriptions also apply to the following text.

[0058] In this embodiment, the light-giving device may include a red light source and a projection optical path. The projection optical path includes a DOE (Diffractive Optical Element) device, a fixation light source, and a conjugate lens assembly. This conjugate lens assembly is used to ensure that the position where the DOE device deflects the red light is optically conjugate to the user's pupil position. Depending on the application scenario, this conjugate lens assembly can be implemented using multiple optical devices, and its specific position in the projection optical path can be set according to its specific structure. For example, in some embodiments, the conjugate lens assembly can be arranged between the emitting end of the diffractive optical element and the user's fundus, so that the position where the diffractive optical element deflects the red light is optically conjugate to the user's pupil position.

[0059] Specifically, such as Figure 6As shown, the aforementioned conjugate lens assembly may include a first conjugate lens and a second conjugate lens. The front focal point of the first conjugate lens is located at the diffractive optical element, the rear focal point of the first conjugate lens coincides with the front focal point of the second conjugate lens, and the rear focal point of the second conjugate lens is located at the user's pupil. The first and second conjugate lenses may be single-element or multi-element lens assemblies. Furthermore, the light-adjusting device also includes a collimating lens, which can be positioned between the red light source and the diffractive optical element. Thus, the red light emitted from the red light source is converged and collimated based on the collimating lens.

[0060] exist Figure 6 In this configuration, the intermediate image plane is formed where the rear focal point of the first conjugate mirror coincides with the front focal point of the second conjugate mirror. Furthermore, the aforementioned projection optical path also includes a first beam splitter, a fixed-view projection mirror, and a fixed-view light source. As an example, the fixed-view light source is positioned above the first beam splitter, while the first beam splitter is positioned between the first conjugate mirror and the intermediate image plane to receive the light beam from the fixed-view projection mirror, thereby achieving optical conjugation between the fixed-view light source and the user's pupil position. In other embodiments, the position of the first beam splitter can be adjusted according to design requirements. For example, as... Figure 7 As shown, the second beam splitter (whose physical characteristics and functions are similar to those of the first beam splitter) can be arranged between the aforementioned intermediate image plane and the second conjugate mirror, and is used to receive the light beam from the fixation light source to achieve optical conjugation between the fixation light source and the user's pupil position.

[0061] It should be noted that, Figure 7 It can be understood as Figure 3 Another specific implementation of the Zhongbu optical device, and related to Figure 6 The working principle of the optical vision device is the same; the only difference lies in the position of the beam splitter and the fixation light source. For example, preferably, a point light source of a wavelength other than red light is used as the fixation light source, and a beam splitter is used to introduce it into the main optical path, through which it enters the human eye via a second conjugate mirror. The beam splitter's function is to allow red light to be transmitted through the main optical path and to reflect light from the fixation light source in one direction, thus achieving beam combining of the two beams. Secondly, the fixation light source is located at the front focal point of the second conjugate mirror, so that the fixation light source is optically conjugate with the fundus. In some implementation scenarios, the beam splitter may include a dichroic mirror that splits light by wavelength or a beam splitter that splits light by a certain energy ratio.

[0062] In practical use, when the human eye is in a normal refractive state (e.g., a normal human eye or a normal human eye that has been compensated for by wearing glasses or contact lenses), the aforementioned light-adjusting devices (e.g.) Figure 6 or Figure 7The optical elements in this device do not require focusing and their positions are relatively fixed. When the human eye is nearsighted or farsighted, the light-correcting device can achieve clear focus by adjusting one set of elements, allowing the human eye to clearly see the fixation point. From the perspective of optical imaging principles, when the main red light and the fixation light source in the light-correcting device pass through the projection light path, a real image plane is generated at the intermediate image plane. When the distance between the intermediate image plane and the focal point in front of the second conjugate mirror changes, it alters the convergence or divergence of the red light output from the second conjugate mirror. If the human eye is nearsighted (i.e., has a certain refractive error), the parallel light output from the second conjugate mirror will fall in front of the retina. Therefore, the disclosed solution proposes reducing the distance between the intermediate image plane and the focal point in front of the second conjugate mirror, so that the red light entering the human eye from the second conjugate mirror is in a divergent state, thereby allowing the red light to fall on the retina. Therefore, refractive compensation can be achieved by shifting the optical axis of the intermediate image plane containing the red light and the fixation point relative to the focal point in front of the second conjugate mirror.

[0063] Additionally or optionally, the axial difference between the front focal point of the second conjugate mirror and the intermediate image plane (e.g.) can also be used. Figure 8 The axial distance Δ shown is used to calculate the basic refractive power information of the tested eye. Here, adjustment of the axial distance can include active feedback adjustment, such as the user actively adjusting the refractive compensation amount based on the clarity of the fixation point. In this case, the user can adjust the refractive compensation amount manually or electrically.

[0064] In one embodiment, the relationship between the axial distance Δ (mm) between the aforementioned intermediate image plane and the front focal point of the second conjugate lens and the human eye's refractive power D is: D = 1000Δ / (f2*(f2+Δ)), where the focal length of the second conjugate lens is f2 (mm). It can be understood that Δ is positive when the intermediate image plane is referenced to the front focal point of the second conjugate lens and is far from the second conjugate lens.

[0065] Furthermore, the aforementioned methods for adjusting the refractive power of the human eye can be implemented through various means. Therefore, in some embodiments, the optical correction device disclosed herein may also be provided with one or more drive mechanisms (e.g., stepper motors) that drive the second conjugate mirror to move relative to the intermediate image plane formed at the front focal point of the second conjugate mirror, and / or drive the red light source, the first conjugate mirror, the DOE device, the fixation light source, the first beam splitter (or the second beam splitter), and / or the collimating lens to move relative to the intermediate image plane formed at the front focal point of the second conjugate mirror.

[0066] For example, for those who possess Figure 9a and Figure 9b The light-adjusting device shown in the diagram can use a front-group focusing method for refractive compensation adjustment. For example... Figure 9a and Figure 9bAs shown, a driving mechanism can be used to drive the related optical devices of the fixation light source and the red light source in tandem, so that the positions of the fixation light source and the intermediate image plane are kept consistent, and the intermediate image plane is shifted from the focal point in front of the second conjugate lens, thereby achieving refractive compensation adjustment. Specifically, the red light source, the first conjugate lens, the DOE device, the fixation light source, the beam splitter (i.e., the first or second beam splitter), and the collimating lens can be linked together to achieve refractive compensation adjustment.

[0067] Furthermore, such as Figure 9a As shown, the light-gathering device may also include a fixed-view projection lens. This fixed-view projection lens is operable to project the light beam from the fixed-view light source onto the intermediate image plane position via a lens projection. During refractive compensation adjustment using the front-group focusing method, the first conjugate mirror and the DOE device can be moved by using a drive mechanism relative to the intermediate image plane formed at the front focal point of the second conjugate mirror. Since the collimated red light alignment diameter is not sensitive to changes in the distance between the DOE device and the collimating lens, the collimating lens and the red light source do not need to be adjusted in this application scenario.

[0068] For example, refractive compensation can also be achieved using rear-group focusing. Specifically, the second conjugate lens can be moved by a drive mechanism relative to the intermediate image plane formed at the front focal point of the second conjugate lens. Figure 9c As shown, the axial position of the second conjugate mirror can be adjusted by the drive mechanism (moving left and right as shown in the figure) to achieve convergence and divergence of light entering the human eye, thereby compensating for the refractive power of the human eye.

[0069] Furthermore, in some embodiments, the light spot in this disclosed scheme can have different preset patterns according to different projection requirements, and each preset pattern corresponds to a micro / nano structured diffractive optical element device. For example... Figure 10 As shown, during use, a switching mechanism (such as a slot mechanism that supports the detachable installation of DOE devices) can be set in the optical feeding device, and based on the switching mechanism, one of the diffractive optical elements with corresponding micro-nano structures can be switched to the projection optical path according to the transmission requirements.

[0070] In some implementation scenarios, the aforementioned annular light spot can have a preset pattern, such as... Figure 11 As shown in the diagram. For example, the preset pattern may include a ring with uniform color, a ring whose color gradually lightens from the outside to the inside, a ring composed of multiple concentric circles of different radii, a ring composed of multiple line segments arranged radially around the same center, a ring composed of a grid pattern, or a ring composed of a dot matrix. It should be noted that... Figure 11 This is merely an illustrative example of some preset patterns, and the preset patterns that the annular light spot may have in this disclosure are not limited to these. For example, in some application scenarios, the annular light spot disclosed herein may also have... Figure 11The pattern shown is a variation, rotation, or combination of the pattern.

[0071] In summary, the disclosed solution enables red light illumination of specific areas of the fundus, reducing or equalizing the red light illuminance in the fovea, thereby avoiding strong visual stimulation. Simultaneously, it increases the red light energy distribution in the peripheral macula. Furthermore, it introduces a fixation light source to generate a fixation point to assist the user in aligning the light spot area to the center and provides a visual target for reading human eye refractive information. In addition, it allows for the acquisition of basic human eye refractive information through user-initiated feedback. It should be emphasized that the description of the projection optical path in this disclosure is merely exemplary and not restrictive. Those skilled in the art can modify the optical path based on the teachings of this disclosure to adapt to different application scenarios, and these modifications still fall within the scope of protection of this disclosure.

[0072] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A light-giving device, characterized in that, include: A red light source, which operates to generate red light for illuminating the user's fundus; as well as The projection light path operates to receive the red light and project the red light onto the user's fundus. The projection optical path includes diffractive optical elements, a fixed light source, and a conjugate mirror assembly. The diffractive optical element is operated to deflect the red light so that the projected light path projects a light spot with a preset pattern in a predetermined area of ​​the user's fundus, wherein the preset pattern includes a ring pattern. as well as The fixed-view light source is operated to illuminate the projection light path to guide the user to gaze at the center of the light spot; The conjugate lens group is arranged between the emitting end of the diffractive optical element and the user's fundus, so that the position where the diffractive optical element causes the red light to deflect in the specified direction is optically conjugate with the position of the user's pupil; the conjugate lens group includes a first conjugate lens and a second conjugate lens, wherein the front focal point of the first conjugate lens is located at the diffractive optical element, the rear focal point of the first conjugate lens coincides with the front focal point of the second conjugate lens, and the rear focal point of the second conjugate lens is located at the user's pupil.

2. The phototherapy device according to claim 1, characterized in that, The predetermined area of ​​the user's fundus includes a predetermined area of ​​the macula, which is divided according to the angle of the macula.

3. The phototherapy device according to claim 1, characterized in that, The intermediate image plane is formed at the point where the rear focal point of the first conjugate mirror coincides with the front focal point of the second conjugate mirror, and the projection optical path includes: A first beam splitter is arranged between the first conjugate mirror and the intermediate image plane and is used to receive a beam of light from the fixed light source to achieve optical conjugation between the fixed light source and the user's pupil position.

4. The phototherapy device according to claim 1, characterized in that, The intermediate image plane is formed at the point where the rear focal point of the first conjugate mirror coincides with the front focal point of the second conjugate mirror, and the projection optical path includes: The second beam splitter is arranged between the intermediate image plane and the second conjugate mirror and is used to receive the light beam from the fixation light source to achieve optical conjugation between the fixation light source and the user's pupil position.

5. The phototherapy device according to claim 1, characterized in that, Also includes: A collimating lens is arranged between the red light source and the diffractive optical element device, which is used to converge and collimate the red light emitted by the red light source.

6. The phototherapy device according to claim 1, characterized in that, Also includes: The switching mechanism is used to switch one of the diffractive optical elements with corresponding micro / nano structures into the projection optical path according to different projection requirements.

7. The phototherapy device according to claim 6, characterized in that, The different projection requirements correspond to light spots with different preset patterns, and the light spots with different preset patterns are generated based on diffractive optical elements with different micro-nano structures.

8. The phototherapy device according to claim 1, characterized in that, The preset pattern also includes a circular pattern, wherein the annular pattern includes a uniformly colored annular pattern, an annular pattern whose color gradually lightens from the outside to the inside, an annular pattern composed of multiple concentric circles of different radii, an annular pattern composed of multiple line segments arranged radially around the same center, an annular pattern composed of a grid pattern, or an annular pattern composed of a dot matrix.

9. The phototherapy device according to claim 5, characterized in that, It also includes a drive mechanism that operates to perform at least one of the following drives in order to achieve refractive compensation for the user's eye through focusing: The second conjugate mirror is moved relative to the intermediate image plane formed at the front focal point of the second conjugate mirror. as well as The red light source, the first conjugate mirror, the diffractive optical element, the fixed light source, the collimating mirror, and / or one of the first and second beam splitters are moved relative to the intermediate image plane formed at the front focal point of the second conjugate mirror.

10. The phototherapy device according to claim 9, characterized in that, It also includes a fixed projection lens, which is operated to project a beam of light from the fixed light source onto the intermediate image plane in a lenticular manner, and the drive mechanism is operated to drive the first conjugate mirror and the diffractive optical element device to move relative to the intermediate image plane formed at the front focal point of the second conjugate mirror.

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