A method for detecting the refractive power of human eyes and related products

Abstract

The present disclosure discloses a method for detecting the refractive power of the human eye and related products. The method uses a light-feeding device for detection, and the light-feeding device includes a red light source and a projection light path for projecting red light to the human eye. The method includes: using the projection light path including a diffraction optical element device and a conjugate mirror to form an intermediate image plane of the red light; adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point observed by the human eye in the projection light path; and determining the refractive power of the human eye according to the distance when the human eye clearly observes the fixation point. Using the scheme of the present disclosure, the detection of the refractive power of the human eye can be completed during the light-feeding operation, thereby improving the efficiency of the detection of the refractive power of the human eye.

Description

Technical Field

[0001] The present disclosure generally relates to the field of optical imaging technology. More specifically, the present disclosure relates to a method, apparatus, light-feeding device, and computer program product for detecting the refractive power of a human eye. Background Art

[0002] The number of myopic users is currently on the rise, and axial length growth has become one of the main factors contributing to myopia. To achieve proactive and effective myopia prevention and control, existing technologies propose irradiating the retina with red light. Specifically, existing technologies propose using a light-emitting device to irradiate the fundus with red light, thereby utilizing the warming effect of red light (e.g., 650 nanometers) to improve blood circulation in the fundus, thereby effectively inhibiting the progression of myopia. However, current light-emitting devices are relatively limited in functionality and do not provide any functions other than light-emitting. In particular, users of light-emitting devices cannot obtain any information about their eye's refractive power through the light-emitting device. Furthermore, current light-emitting devices themselves have various design flaws. For example, their use of a point light source results in intense visual stimulation of the human eye during light-emitting periods. Furthermore, during red light-emitting periods, the red light energy is more concentrated in the center of the macula, while the red light energy in the peripheral macula is very weak. This can also cause a warming effect and uneven stimulation on the choroid, ultimately affecting the actual effectiveness of red light irradiation in inhibiting axial length growth.

[0003] In view of this, it is urgent to provide a solution for detecting the diopter of the human eye so that the user can obtain information about the diopter of the eye while performing the light feeding operation. Furthermore, it is necessary to improve the structure of the existing light feeding equipment so as to provide an efficient light feeding operation. Summary of the Invention

[0004] In order to at least solve one or more of the technical problems mentioned above, the present disclosure proposes a solution for detecting the diopter of the human eye in multiple aspects. Using the solution of the present disclosure, it is possible to obtain the diopter information of the user's human eye during the light-feeding operation.

[0005] In a first aspect, the present disclosure provides a method for detecting the refractive power of a human eye, characterized in that the method uses a light-feeding device for detection, and the light-feeding device includes a red light source and a projection light path for projecting red light to the human eye, and the method includes: using the projection light path including a diffraction optical element device and a conjugate mirror to form an intermediate image plane of the red light; adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye; and determining the refractive power of the human eye based on the distance when the human eye clearly observes the fixation point.

[0006] In one embodiment, the diffractive optical element device is operated to deflect the red light in a direction so that the projection light path projects a light spot in a predetermined area of ​​the fundus of the user.

[0007] In another embodiment, the projection light path includes: a conjugate lens group, which is used to make the position where the diffraction optical element device causes the red light to deflect in the said direction form an optical conjugate with the user's pupil position.

[0008] In another embodiment, the conjugate lens group is arranged between the output end of the diffractive optical element and the fundus of the user, so that the position where the diffractive optical element causes the red light to deflect in the said direction is optically conjugated with the position of the user's pupil.

[0009] In one embodiment, the conjugate mirror group includes a first conjugate mirror and a second conjugate mirror, wherein the front focus of the first conjugate mirror is located at the diffraction optical element device, an intermediate image plane is formed at the back focus of the first conjugate mirror, and the back focus of the second conjugate mirror is located at the user's pupil, wherein adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye includes: moving the intermediate image plane with the front focus of the second conjugate mirror as a reference according to the clarity of the fixation point.

[0010] In another embodiment, the conjugate mirror group includes: a projection mirror arranged between the red light source and the diffractive optical element device, and the intermediate image plane is formed at the rear imaging surface of the projection mirror; and a third conjugate mirror arranged between the output end of the diffractive optical element device and the fundus of the user, and the rear focus of the third conjugate mirror is located at the user's pupil, wherein adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye includes: moving the intermediate image plane with the front focus of the third conjugate mirror as a reference according to the clarity of the fixation point.

[0011] In another embodiment, the light-feeding device further includes a driving mechanism, wherein adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye includes: utilizing the driving mechanism to drive the movement of the optical device in the projection light path for forming the intermediate image plane, so as to adjust the distance between the conjugate mirror and the intermediate image plane.

[0012] In a second aspect, the present disclosure provides an apparatus for detecting the refractive power of a human eye using a light-feeding device, comprising: a processor; and a memory storing computer program instructions for detecting the refractive power of a human eye using a light-feeding device. When the computer program instructions are executed by the processor, the method described in the above-mentioned first aspect and its multiple embodiments is implemented.

[0013] In a third aspect, the present disclosure provides a lighting device, comprising the apparatus according to the second aspect and configured to perform the method according to the first aspect and its embodiments.

[0014] In a fourth aspect, the present disclosure provides a computer-readable storage medium having stored thereon computer program instructions for detecting the refractive power of a human eye using a light-feeding device. When the computer program instructions are executed by a processor, the method according to the first aspect and its multiple embodiments is implemented.

[0015] Through the method, apparatus, light-feeding device, and computer-readable storage medium provided above, the disclosed embodiments can obtain information about the user's myopia level, i.e., the user's eye diopter, by adjusting the position of relevant optical components in the light-feeding device. Thus, the disclosed solution can detect the user's eye diopter during the light-feeding operation, thereby improving the efficiency of eye diopter detection.

[0016] Furthermore, in some embodiments, in order to overcome the defects of the prior art light-feeding devices, the disclosed solution also improves the light-feeding devices, thereby providing a red light illumination pattern that illuminates a predetermined area of ​​the fundus. Specifically, in order to achieve effective red light illumination, the disclosed light-feeding device introduces a diffractive optical element device so that the projection light path in the light-feeding device projects a light spot on a predetermined area of ​​the user's fundus. According to the different micro-nanostructure designs of the diffractive optical element ("DOE") device, different patterns of light spots can be achieved, and the different patterns cover different areas of the fundus (e.g., the macula). Therefore, when the light spot is circular, the fundus area can have a uniform red light energy distribution, thereby achieving a light-feeding effect with uniform energy distribution. Correspondingly, when the light spot is annular, the disclosed solution can make the light spot projected on the user's fundus form a red light annular energy distribution that avoids a specific peripheral macular area of ​​the fovea, and at the same time use optical conjugation technology to ensure the light-feeding power entering the eye to achieve efficient red light illumination, thereby effectively improving the light-feeding effect on the human eye. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 A simplified flow chart of a method for detecting the refractive power of a human eye according to an embodiment of the present disclosure is shown;

[0019] Figure 2 A simplified structural block diagram of a light-feeding device according to an embodiment of the present disclosure is shown;

[0020] Figure 3 An exemplary flow chart showing a method for detecting the refractive power of a human eye according to some embodiments of the present disclosure is shown;

[0021] Figure 4 shows a detailed optical structure block diagram of a light-feeding device according to some embodiments of the present disclosure;

[0022] Figure 5 Shows the use of Figure 4 An exemplary flow chart of a method for detecting the diopter of a human eye by a light-feeding device is shown;

[0023] Figure 6 A detailed optical structure diagram of a light-feeding device according to other embodiments of the present disclosure is shown;

[0024] Figure 7 Shows the use of Figure 6 An exemplary flow chart of a method for detecting the diopter of a human eye by a light-feeding device is shown;

[0025] Figure 8 A detailed optical structure diagram of a light-feeding device according to some embodiments of the present disclosure is shown;

[0026] Figure 9 A detailed optical structure diagram of a light-feeding device according to other embodiments of the present disclosure is shown;

[0027] Figure 10 A diagram showing energy distribution of an annular spot according to an embodiment of the present disclosure;

[0028] Figure 11 A schematic block diagram of a device for detecting the refractive power of a human eye according to the present disclosure is shown. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0030] It should be understood that the terms “include” and “comprising” used in the specification and claims of the present disclosure indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this disclosure is for the purpose of describing specific embodiments only and is not intended to limit the disclosure. As used in this disclosure and the claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should be further understood that the term "and / or" as used in this disclosure and the claims refers to any and all possible combinations of one or more of the associated listed items, including and including these combinations.

[0032] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0033] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0034] Example application scenarios

[0035] As mentioned above, the current light-feeding device has a relatively simple function and cannot provide other functions besides light-feeding. In addition, the current light-feeding device itself has design defects, which makes it impossible to provide a light-feeding operation with high light-feeding efficiency and good user experience. In view of this, the solution disclosed in the present invention proposes to use the projection light path in the light-feeding device to realize the detection of the refractive power of the user's human eye during the light-feeding operation. In this way, the user can obtain the refractive power information about his own eyes while using the light-feeding device for red light irradiation, so as to understand the severity of his myopia and take corresponding prevention and control measures. In addition, in order to realize the detection of refractive power and improve the light-feeding effect, the solution disclosed in the present invention also improves the optical path of the existing light-feeding device, such as introducing a diffraction optical element device and a conjugate mirror in the projection light path, so as to realize effective red light irradiation of the human eye.

[0036] Exemplary Refractive Power Detection Scheme

[0037] In view of this, the disclosed embodiment provides a solution for detecting the refractive power of the human eye, which adjusts the distance between the conjugate mirror and the intermediate image plane by observing the clarity of the fixation point in the projection light path by the human eye, thereby effectively obtaining the refractive power information of the human eye.

[0038] Figure 1A simplified flow chart of a method 100 for detecting the refractive power of a human eye according to an embodiment of the present disclosure is shown. Based on the following description, those skilled in the art will appreciate that the detection method herein can be performed by a lighting device of the present disclosure (e.g., a general-purpose processor or a dedicated processor in the lighting device), and that the lighting device can include a red light source and a projection light path for projecting red light toward the human eye.

[0039] As shown in the figure, in step S102, the projection light path including the diffractive optical element device and the conjugate mirror is used to form the intermediate image plane of the red light. In the context of the present disclosure, the diffractive optical element device ("DOE") here produces an angular deflection on the incident red light from the red light source while maintaining the directionality of its laser, so that a light spot is projected in a preset area of ​​the user's fundus. Thus, the scheme of the present disclosure can achieve precise and effective light-feeding operation. In some embodiments, the micro-nano structure of the DOE device can be changed according to the projection requirements, so that the present disclosure can provide a light spot with different preset patterns. Thus, the scheme of the present disclosure can provide a light spot with a customized pattern, which is extremely beneficial for providing personalized light-feeding. For example, when an annular light spot is formed, the light-feeding operation of the present disclosure can form a red light annular energy distribution in a specific peripheral macular area that avoids the fovea of ​​the macular area.

[0040] The conjugate mirror mentioned above can be a single lens or a multi-lens structure. This conjugate mirror can be used to optically conjugate the location where the DOE device deflects the red light with the user's pupil. This conjugate mirror can be implemented by combining multiple components, and its specific location in the projection light path can be set based on its specific structure. For example, in some embodiments, the conjugate mirror can be placed between the output end of the diffractive optical element and the user's fundus, so that the location where the diffractive optical element deflects the red light is optically conjugate with the user's pupil.

[0041] Returning to the process, at step S104, the distance between the conjugate mirror and the intermediate image plane is adjusted based on the clarity of the fixation point in the projection light path observed by the human eye. Depending on the implementation scenario, the fixation point here can be provided by the DOE device itself or by a separate fixation light source. In one application scenario, the adjustment here can be that the user actively adjusts the aforementioned distance based on the clarity of the fixation point when observing it, thereby actively adjusting the refractive compensation amount. Depending on the implementation method, the adjustment here can be manual and / or electric.

[0042] Finally, in step S106, the human eye's diopter is determined based on the distance when the human eye clearly observes the fixation point. That is, the present disclosure utilizes the correspondence between the aforementioned distance and the human eye's diopter to obtain the human eye's diopter.

[0043] Figure 2 FIG. 2 shows a simplified structural block diagram of a light-feeding device 201 according to an embodiment of the present disclosure. Figure 2 As shown, the projection light path device 201 may include a red light source 202 and a transmission light path 203. In an exemplary embodiment, the transmission light path 203 may include a front group of elements and a rear group of elements. As an example, the front group of elements schematically includes a DOE device 204 and the rear group of elements schematically includes a conjugate mirror 205. By reading the context, it can be understood that the projection light path of the present disclosure can add additional optical devices according to application requirements, build an optical path suitable for the innovative principles of the present disclosure, or change the exemplary optical path structure of the present disclosure, and these modifications still fall within the scope of protection of the present disclosure. In addition, in order to clearly illustrate the optical path principle of the projection light path device, Figure 2 The user's eye (or fundus) 206 is also schematically shown.

[0044] For ease of understanding, Figure 2 The fundus structure of the human eye is further exemplified. In particular, the figure shows the angular distribution of the macular area of ​​the fundus retina. For example, for the entire macular area, it has an angular distribution of 15 degrees; for the peripheral macular area, it has an angular distribution of 8 degrees; and for the fovea, it has an angular distribution close to 5 degrees. In view of such an angular distribution, the micro-nano structure of the DOE device can be customized accordingly, so that when it is introduced into the projection light path disclosed in the present invention, a light spot corresponding to the specific angular distribution area of ​​the aforementioned macular area is generated. Regarding the customized processing of the micro-nano structure of the DOE device, it falls within the scope of the prior art. In order to avoid unnecessary confusion of the solution disclosed in the present invention, this application does not describe it in detail.

[0045] Specifically, the aforementioned red light source 202 operates to generate red light for illuminating the user's fundus. In some implementations, the red light source 202 may be a laser diode or other electronic device capable of generating a coherent light source. It should be noted that this disclosure does not limit the specific type of red light source, and the type may be selected based on actual needs.

[0046] In application, the above-mentioned projection light path 203 can be operated to receive red light and project the red light to the fundus of the user. To this end, the projection light path disclosed herein can specifically include a front group of components including a DOE device 204. The front group of components can also optionally include a collimating lens and / or a projection lens. Correspondingly, the projection light path 203 can also include a rear group of components including a conjugate mirror 205. In one embodiment, based on the physical properties and functions of the DOE device 204, the solution disclosed herein can accurately operate to directional deflect the aforementioned red light, so that the projection light path can project a light spot in a predetermined area of ​​the user's fundus 206 (for example, a macular area divided by angle). To this end, for example, the micro-nano structure of the DOE can be processed according to specific requirements to obtain a specific directional deflection of the red light.

[0047] Figure 3 An exemplary flow chart of a method 300 for detecting the refractive power of a human eye according to some embodiments of the present disclosure is shown.

[0048] like Figure 3 As shown, in step S302, a projection light path including a DOE device and a conjugate mirror is used to form an intermediate image plane of red light. For an exemplary position of the intermediate image plane, please refer to Figure 4 and Figure 6 Then, at step S304, the user receives an adjustment instruction after observing the fixation point. Here, the fixation point can be a fixation point provided by a DOE device or a fixation point provided by a separate fixation light source (such as Figure 10 ), so as to guide the human eye to look at the red light, so that the red light pattern is distributed in a predetermined area of ​​the macular area. As mentioned above, the adjustment instruction here can be an adjustment instruction manually input by the user, for example, by pressing a related button or rotating a related knob. For example, when a myopic user observes the fixation point but finds that its clarity is poor, that is, the fixation point is not clear, an adjustment instruction can be issued by rotating the related knob. Then, at step S306, the distance between the conjugate mirror and the intermediate image plane is adjusted based on the adjustment instruction. Thereafter, at step S308, it can be determined after a predetermined time interval whether further adjustment instructions are received. If received, that is, step S308 is judged as "yes", the process returns to S304 and is repeated. Otherwise, if no further adjustment instructions are received, the process proceeds to step S310, where the refractive power of the human eye is determined based on the current distance.

[0049] Figure 4 Detailed structural block diagram of the light-feeding device according to some embodiments of the present disclosure is shown. Figure 4As shown in , the divergent red light generated by the red light source is collimated and output through a collimating mirror and irradiated on the DOE device. Thereafter, the red light is emitted from the DOE device and enters the 4F optical system composed of a first conjugate mirror and a second conjugate mirror, and the 4F optical system projects a light spot onto a predetermined area of ​​the fundus of the user. Specifically, in the 4F optical system, the front focus of the first conjugate mirror is located at the DOE device, the back focus of the first conjugate mirror coincides with the front focus of the second conjugate mirror, and the back focus of the second conjugate mirror is located at the user's pupil. In one implementation scenario, the front focus of the first conjugate mirror is located at the DOE device, that is, the position where the red light produces an angular distribution. Correspondingly, the back focus of the first conjugate mirror coincides with the front focus of the second conjugate mirror. At this time, the red light deflected by the DOE device produces a converging intermediate image plane at this focus, thereby obtaining an annular energy distribution (that is, the annular light spot disclosed herein). The purpose of this setting is to make the position where the DOE device produces angular deflection of red light optically conjugate with the position of the human eye pupil, so that all the light generated by the DOE can enter the human eye pupil, and to make the energy spatial distribution of the intermediate image plane optically conjugate with the fundus of the human eye, and to project the energy distribution of the specific pattern of the intermediate image plane onto the retina of the fundus.

[0050] It can be seen that the DOE device produces a characteristic circular deflection angle deflection on the incident red light while still maintaining its unique laser directionality. Combined with the subsequent 4F system, the disclosed solution can conjugate the light energy of all angles generated by the diffraction of the DOE device to the pupil and enter the human eye, thereby effectively ensuring the light power entering the eye and obtaining the myopia prevention and treatment effect that cannot be achieved by the light-feeding equipment in the existing technology.

[0051] As mentioned above, the solution disclosed herein can also achieve precise control of the light-feeding 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 spot diameter of the red light after collimation is set to D1, the maximum deflection half-angle that the DOE device can achieve is 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 of the human eye is D2, and the maximum angle between the red light entering the pupil and the optical axis is θ2. Based on such a setting, the conjugate magnification of the 4F system disclosed herein is M=f2 / f1, and thus there is such a corresponding relationship, namely D2 / D1=M, θ1 / θ2=M. Based on this, for the determined fundus illumination angle range θ2 and pupil diameter D2, the diffraction angle θ1 of the DOE device 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 divergence angles of red light sources (such as red laser diodes) and focal lengths of collimating lenses may be selected to achieve different collimated light spot diameters.

[0052] During actual use, when the human eye is in a normal refractive state (for example, the human eye is a normal human eye or a normal human eye that has been compensated by wearing glasses and corneal contact lenses), the above-mentioned light-feeding device disclosed herein does not need to be focused, and its position is relatively fixed. However, when the human eye is myopic / hyperopic, the light-feeding device disclosed herein can achieve clear focus by adjusting one of the groups of components, so that the human eye can see the fixation point clearly. From the principle of optical imaging, when the main red light in the light-feeding device passes through the projection light path, a real image plane will be generated at the intermediate image plane position. When the distance between the intermediate image plane and the front focus of the second conjugate mirror changes relatively, the convergence or divergence state of the red light output from the second conjugate mirror will change. If the human eye is in a myopic state (that is, there is a certain refractive power), the parallel light output by the second conjugate mirror will fall in front of the retina of the human eye.

[0053] In light of this, the disclosed solution proposes reducing the distance between the intermediate image plane and the front focal point of the second conjugate lens, causing the red light entering the human eye through the second conjugate lens to diverge, thereby allowing the red light to fall on the human retina. Consequently, compensation for human refractive error can be achieved by offsetting the intermediate image plane, where the red light and fixation point reside, from the front focal point of the second conjugate lens along the optical axis.

[0054] Based on the above description, Figure 4 In the embodiment shown, the present disclosure proposes that the axial difference between the front focus and the intermediate image plane of the second conjugate mirror (such as Figure 4 The basic refractive power information of the measured eye can be calculated by converting the axial spacing Δ shown in FIG. Here, the adjustment of the axial spacing can include active feedback adjustment as described above, for example, where the user actively adjusts the refractive compensation amount based on the clarity of the fixation point. For example, the user can adjust the refractive compensation amount manually or electrically.

[0055] In terms of the refractive power of the human eye, the corresponding relationship between the axial distance Δ (mm) between the intermediate image plane and the second conjugate lens front focus and the refractive power D of the human eye is:

[0056] D = 1000Δ / (f2*(f2+Δ)) (1)

[0057] The focal length of the second conjugate mirror is f2 (mm). It can be understood that when the intermediate image plane is based on the front focus of the second conjugate mirror and is far away from the second conjugate mirror, Δ is positive.

[0058] Figure 5 Shows the use of Figure 4 The exemplary flow chart of the method 500 for detecting the diopter of the human eye by the light-feeding device shown in FIG. Figure 5 As shown, at step S502, the light-feeding device (such as Figure 4) to form an intermediate image plane of red light. Specifically, by using the DOE device in conjunction with the first conjugate mirror and other optional lenses, an intermediate image plane can be formed at the back focus of the first conjugate mirror. In this case, the back focus of the second conjugate mirror is located at the user's pupil. Then, at step S504, an adjustment instruction made by the user regarding his observation fixation point is received. Thereafter, at step S506, the distance between the front focus of the second conjugate mirror and the intermediate image plane is adjusted based on the adjustment instruction. As an example, the light-feeding device disclosed in the present invention may also be provided with one or more driving mechanisms (such as stepping motors), which move the intermediate image plane based on the front focus of the second conjugate mirror according to the clarity of the user's observation fixation point. As an example, the movement here can drive the red light source, the collimating mirror and / or the DOE device to move.

[0059] Next, at step S508, a determination is made as to whether a further adjustment instruction has been received. If the determination is "yes," i.e., a further adjustment instruction has been received, the process returns to step S504 to repeat the spacing adjustment operation. If the determination is "no," the process proceeds to step S510, where the current axial difference between the front focus of the second conjugate mirror and the intermediate image plane, also referred to as the axial spacing Δ, is determined. Thereafter, at step S512, the user's diopter is determined based on the current axial difference.

[0060] Figure 6 Detailed optical structure diagram of the light-feeding device according to other embodiments of the present disclosure is shown. Figure 6 As shown in FIG, the light-feeding device may include a red light source, a projection mirror, a DOE device and a third conjugate mirror. Figure 4 The collimating mirror and the first conjugate mirror in the light-emitting device shown. The aforementioned red light source can generate red light for irradiating the fundus of the user. Furthermore, the projection light path formed by the projection mirror, the DOE device and the third conjugate mirror can receive red light and project the red light to the fundus of the user. Among them, the DOE device can be precisely operated to deflect the direction of the aforementioned red light so that the projection light path can project a ring-shaped light spot on the fundus of the user. In the projection light path, the projection mirror can be operated to project the red light emitted by the red light source to converge it into a focus at the front focal plane of the third conjugate mirror, and the rear focus of the conjugate mirror is located at the user's pupil. Thus, the conjugate mirror group formed by the projection mirror and the third conjugate mirror can make the position where the DOE device causes the red light to be deflected in the direction form an optical conjugate with the position of the user's pupil, thereby ensuring the light-emitting rate entering the human eye.

[0061] Further, if Figure 6As shown in , an intermediate image plane is formed at the rear imaging surface of the projection mirror. In this case, to detect the diopter, the intermediate image plane can be moved based on the clarity of the fixation point observed by the human eye, with the front focus of the third conjugate mirror as a reference, so as to obtain the distance between the conjugate mirror and the intermediate image plane when the fixation point is clearly observed. Thus, the diopter of the human eye can be obtained from this distance, for example, by calculating it using the aforementioned formula (1).

[0062] Figure 7 Shows the use of Figure 6 The exemplary flow chart of the method 700 for detecting the diopter of the human eye by the light-feeding device is shown. Figure 6 The descriptions made are similar and will not be described in detail below.

[0063] like Figure 7 As shown in FIG, at step S702, the light-feeding device (ie Figure 6 ) to form an intermediate image plane at the rear imaging surface of the projection mirror. Then, at step S704, an adjustment instruction made by the user regarding his observation fixation point is received. Thereafter, at step S706, the distance between the front focus of the third conjugate mirror and the intermediate image plane is adjusted based on the adjustment instruction. Taking into account that the adjustment may be multiple times, at step S708, it is determined whether further adjustment instructions are received. In response to receiving an adjustment instruction, the process returns to step S702, otherwise the process proceeds to step S710. At step S710, the current axial difference axis between the front focus of the third conjugate mirror and the intermediate image plane is determined, that is, Figure 6 Finally, at step S712 , the user's diopter is determined based on the current axial difference.

[0064] Figure 8 Detailed structural block diagram of the light-feeding device according to some embodiments of the present disclosure is shown. Figure 8 As shown, the light-feeding device includes a red light source and a projection light path. The projection light path includes a DOE device, a fixation light source, and a conjugate lens group. The conjugate lens group can be used to make the position where the DOE causes the red light to be deflected in the direction form an optical conjugate with the user's pupil position. The conjugate lens group can be realized by cooperating with multiple optical devices, and the specific position of the conjugate lens group in the projection light path can be set according to its specific structure. For example, in some embodiments, the conjugate lens group can be arranged between the output end of the diffractive optical element device and the fundus of the user, so that the position where the diffractive optical element device causes the red light to be deflected in the direction form an optical conjugate with the user's pupil position.

[0065] Specifically, if Figure 8As shown, the conjugate mirror assembly described above may include a first conjugate mirror and a second conjugate mirror, wherein the front focal point of the first conjugate mirror is located at the DOE device, the back focal point of the first conjugate mirror coincides with the front focal point of the second conjugate mirror, and the back focal point of the second conjugate mirror is located at the user's pupil. As previously mentioned, the first conjugate mirror and the second conjugate mirror may be a single-element or multi-element mirror assembly. Furthermore, the light-emitting device also includes a collimator lens disposed at the incident end of the DOE device, that is, the collimator lens is disposed between the red light source and the DOE device. Thus, based on the physical properties of the collimator lens, the red light emitted by the red light source can be converged and collimated.

[0066] In the light-feeding device shown in the figure, the point where the rear focus of the first conjugate mirror and the front focus of the second conjugate mirror overlap can form an intermediate image plane. Furthermore, the aforementioned projection light path can also include a beam splitter, which can be arranged between the first conjugate mirror and the intermediate image plane 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. In other embodiments, the position of the beam splitter can be adjusted according to design requirements. For example, Figure 8 As shown in , the spectroscope can be arranged between the aforementioned intermediate image plane and the second conjugate mirror to achieve optical conjugation between the fixation light source and the user's pupil position. As for the adjustment of the spacing between the intermediate image plane and the second conjugate mirror disclosed in the present invention, the present invention proposes that Figure 8 All the devices framed by the dotted frame move as a whole, so that the human eye can clearly observe the fixation point through such movement and focusing, and the refractive power of the human eye can be calculated by measuring the adjusted distance.

[0067] Figure 9 Detailed structural block diagram of the light-feeding device according to some other embodiments of the present disclosure is shown. Figure 9 The light feeding device shown is Figure 8 The structures shown are the same. However, there are obvious differences between the two in terms of adjusting the distance between the intermediate image plane and the second conjugate mirror. Specifically, different from Figure 8 The overall linkage of the front group of components (framed by the dotted box) shown in Figure 9 Only the rear group of elements is moved, that is, only the second conjugate mirror is moved and focused, so that the refractive power of the human eye can be determined by the final distance measurement.

[0068] For example, for Figure 8 The light-feeding device with the structure shown in the figure can be adjusted for diopter compensation by using the front group focusing method. Figure 8As shown, a drive mechanism can be used to drive the optical components related to the fixation light source and the red light projection to work in conjunction, so that the positions of the fixation light source and the intermediate image plane are consistent, and the intermediate image plane and the front focus of the conjugate mirror 2 are offset to achieve refractive compensation adjustment. Specifically, the red light source, the intermediate image projection mirror, the DOE, the fixation light source, and the beam splitter can be linked to achieve refractive compensation adjustment.

[0069] Figure 10 The energy distribution diagram of the annular light spot according to the embodiment of the present disclosure is shown. According to the description in the context, those skilled in the art can understand that the solution of the present disclosure can form different light spot patterns corresponding to predetermined areas of the fundus. The characteristics of the annular light spot are described here for the purpose of example only. Specifically, Figure 10 The energy distribution of an annular light spot with a fixation point is shown in the figure, wherein the fixation light source acts in the projection light path to form a light spot in the middle of the annular area (the middle of the fovea of ​​the macular area in the figure) to play a fixation function to guide the human eye to look, wherein curve 1 indicates the energy distribution at the fovea and curve 2 indicates the energy distribution in the peripheral area of ​​the macular area. It should be understood that when the user looks at the annular light spot (i.e., is illuminated), he can look at the center of the annular light spot under the guidance of the fixation light source. At this time, the annular light spot projected on the fundus of the user can avoid the fovea of ​​the macular area and be evenly distributed in the peripheral macular area. In this way, efficient red light irradiation can be achieved, and at the same time, energy can be avoided from being concentrated in the fovea to stimulate vision. In addition, the annular light spot with energy distributed all around can produce uniform lighting stimulation to the choroid of the macular area, thereby ensuring a more uniform warming effect and stimulation to the choroid, thereby achieving effective light therapy for the human eye.

[0070] Similar to the annular spot, by adjusting the micro-nanostructure of the DOE device, it can be made to generate a circular spot through the projection light path. For example, it can be projected over the entire peripheral macular area with an 8-degree angle distribution, thereby providing uniformly distributed red light to the peripheral macular area. It is understood that it is also possible to uniformly illuminate a specific area within the peripheral macular area (such as within a 7-degree range). Therefore, the disclosed solution is not limited to the fundus illumination range and can provide targeted illumination as needed.

[0071] Figure 11 FIG. 1 is a schematic block diagram of an apparatus 1100 for detecting the refractive power of a human eye according to the present disclosure. Figure 11As shown in , the apparatus 1100 of the present disclosure may include a processor 1101 and a memory 1102, wherein the processor 1101 and the memory 1102 communicate with each other via a bus 1103. The memory 1102 stores computer program instructions executable by the processor 1101. When the computer program instructions are executed by the processor 1101, the apparatus performs the method steps described above in conjunction with the accompanying drawings. In some application scenarios, the apparatus 1100 herein may be incorporated into Figure 2 、 4 , 6, 8 and 9 exemplarily illustrate the light-feeding devices, so as to realize the detection of the refractive power of the human eye by using the light-feeding devices.

[0072] Although a plurality of embodiments of the present 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. Those skilled in the art may conceive of many modifications, changes, and alternatives without departing from the ideas and spirit of the present disclosure. It should be understood that in practicing the present disclosure, various alternatives to the embodiments of the present disclosure described herein may be adopted. The appended claims are intended to define the scope of protection of the present disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A method for detecting the refractive power of a human eye, characterized in that: The method uses a light-feeding device for detection, and the light-feeding device includes a red light source and a projection light path for projecting red light toward a human eye. The method includes: forming an intermediate image plane of the red light by utilizing the projection optical path including a diffractive optical element device and a conjugate mirror; Adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye; and Determining the refractive power of the human eye according to the distance when the human eye clearly observes the fixation point; The projection light path includes a conjugate lens group, which is arranged between the output end of the diffractive optical element and the fundus of the user, so that the position where the diffractive optical element deflects the red light is optically conjugated with the position of the user's pupil.

2. The method according to claim 1, wherein Adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye comprises: receiving an adjustment instruction made by the user after observing the fixation point; and The distance between the conjugate mirror and the intermediate image plane is adjusted based on the adjustment instruction.

3. The method according to claim 1, characterized in that The conjugate mirror group includes a first conjugate mirror and a second conjugate mirror, wherein the front focus of the first conjugate mirror is located at the diffractive optical element device, the back focus of the first conjugate mirror forms an intermediate image plane, and the back focus of the second conjugate mirror is located at the user's pupil, wherein adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye includes: According to the clarity of the fixation point, the intermediate image plane is moved with the front focus of the second conjugate mirror as a reference.

4. The method according to claim 1, wherein The conjugate lens group includes: a projection lens arranged between the red light source and the diffractive optical element, the intermediate image plane being formed at the rear imaging surface of the projection lens; and a third conjugate lens arranged between the output end of the diffractive optical element and the fundus of the user, and the rear focus of the third conjugate lens is located at the user's pupil, wherein adjusting the distance between the conjugate lens and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye includes: According to the clarity of the fixation point, the intermediate image plane is moved with the front focus of the third conjugate mirror as a reference.

5. The method according to claim 4, characterized in that The light-feeding device further includes a driving mechanism, wherein adjusting the distance between the conjugate mirror and the intermediate image plane according to the clarity of the fixation point in the projection light path observed by the human eye comprises: The driving mechanism is used to drive the movement of the optical device used to form the intermediate image plane in the projection light path, so as to adjust the distance between the conjugate mirror and the intermediate image plane.

6. The method according to any one of claims 1 to 5, characterized in that The diffractive optical element device is operated to deflect the direction of the red light so that the projection light path projects a light spot in a predetermined area of ​​the fundus of the user.

7. A device for detecting the diopter of a human eye using a light-feeding device, characterized in that: include: processor; as well as A memory storing computer program instructions for detecting the refractive power of a human eye using a light-feeding device, wherein when the computer program instructions are executed by a processor, the method according to any one of claims 1 to 6 is implemented.

8. A lighting device comprising the apparatus according to claim 7 and configured to perform the method according to any one of claims 1-6.

9. A computer-readable storage medium storing computer program instructions for detecting the refractive power of a human eye using a light-feeding device, wherein when the computer program instructions are executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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