Refraction detection system

Abstract

The invention discloses a refraction detection system, relates to the field of optical systems, and is used for solving the problem of simultaneously realizing wide-area retina diopter topographic map measurement and retina imaging contrast evaluation. The refraction detection system comprises a light source module used for emitting a plurality of parallel detection light beams and enabling the plurality of detection light beams to be transmitted to a light transmission module in a parallel mode; the light transmission module is used for enabling the plurality of detection light beams to respectively enter a target eye and respectively enter different positions of the fundus of the target eye, acquiring a plurality of return light beams from the target eye and enabling the plurality of return light beams to be transmitted to the imaging module in a parallel form; and the imaging module is used for acquiring the plurality of return light beams and generating a light spot array image based on the plurality of return light beams. According to the invention, the images formed by light beam irradiation at different positions on the retina can be obtained at the same time, and therefore, wide-area retina diopter topographic map measurement and retina imaging contrast evaluation can be realized at the same time.

Description

Technical Field

[0001] The present invention relates to the field of optical systems, and in particular to a refraction detection system. Background Art

[0002] Retinal optical defocus is the mainstream theory of myopia prevention and control. This theory holds that the retina has the characteristic of focusing and growing. For example, when the imaging focus of the peripheral retina is in front of the retina, it is called relative myopic defocus, which has a myopia control effect. Conversely, it is called relative hyperopic defocus, which has the effect of promoting the development of myopia. A large number of animal experiments and clinical studies have confirmed the effectiveness of changing the optical defocus of the peripheral retina for myopia control. Recent studies have shown that the optical defocus of the upper retina of emmetropic children can even predict the rate of myopia development within the next two years.

[0003] However, the recent emergence of point diffusion technology lenses (DOT lenses) has impacted the optical defocus theory: this lens changes the contrast of light on the retina through diffraction technology rather than the optical defocus state, but it also has a significant myopia control effect, which is inconsistent with the optical defocus theory. In order to understand the difference between optical defocus and contrast regulation in the myopia control mechanism, it is hoped to develop a device that can simultaneously achieve wide-area retinal diopter topography measurement and retinal imaging contrast evaluation. Summary of the invention

[0004] The purpose of the present invention is to provide a refractive detection system that can simultaneously obtain images formed by light beams at different positions on the retina, based on which wide-area retinal refractive power topography measurement and retinal imaging contrast evaluation can be simultaneously achieved.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A refraction detection system, comprising:

[0007] A light source module, comprising at least a light source and a first diffractive optical element, wherein the first diffractive optical element is arranged at the light output side of the light source, and is used to separate the original light beam emitted by the light source into a plurality of detection light beams, so that the light source module emits a plurality of parallel detection light beams, and the plurality of detection light beams are transmitted to the light transmission module in a parallel form;

[0008] The optical transmission module is used to make the multiple detection light beams incident on the target eye and incident on different positions of the fundus of the target eye respectively, so that the different positions of the fundus of the target eye generate return light beams respectively, and obtain the multiple return light beams from the target eye and transmit the multiple return light beams to the imaging module in parallel;

[0009] The imaging module is used to acquire the multiple return light beams and generate a light spot array image based on the multiple return light beams.

[0010] In some embodiments, the light source module further comprises:

[0011] The second diffractive optical element is arranged on the light-emitting side of the first diffractive optical element, and is used to make the multiple detection light beams emit in parallel after passing through the second diffractive optical element.

[0012] In some embodiments, the optical transmission module includes:

[0013] A third diffractive optical element is arranged at one end of the optical transmission module close to the target eye, and is used to allow the multiple detection light beams incident on the third diffractive optical element in a parallel form to enter the target eye from the pupil of the target eye after passing through the third diffractive optical element, and further enter different positions of the fundus of the target eye respectively.

[0014] In some embodiments, the optical transmission module includes:

[0015] A first lens array, comprising a plurality of first lenses arranged in parallel, wherein the first lenses of the plurality of first lenses correspond one-to-one to the plurality of return light beams, so that the return light beams pass through the corresponding first lenses;

[0016] A second lens array includes a plurality of second lenses arranged in parallel, wherein the second lenses of the plurality of second lenses correspond one-to-one to the first lenses of the plurality of first lenses, so that the return light beams from the first lenses are emitted after passing through the corresponding second lenses;

[0017] The distance between the first lens and the corresponding second lens along the optical path can be changed, so that the convergence of the return light beam after passing through the corresponding first lens and second lens can be changed, so that the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be changed.

[0018] In some embodiments, the optical transmission module further includes a first fixed reflective element, a first movable reflective element, a second movable reflective element, and a second fixed reflective element, wherein the first fixed reflective element, the first movable reflective element, the second movable reflective element, and the second fixed reflective element are sequentially arranged along an optical path from the first lens array to the second lens array, so that the multiple return light beams from the first lens array pass through the first fixed reflective element, the first movable reflective element, the second movable reflective element, and the second fixed reflective element in sequence;

[0019] The first movable reflective element and the second movable reflective element are respectively movable along an optical path, so that a distance between the first lens and the corresponding second lens along the optical path can be changed.

[0020] In some embodiments, the optical transmission module also includes a lens assembly, and the second lens array and the first lens array are sequentially arranged between the light source module and the lens assembly, and the second lenses of the multiple second lenses correspond one-to-one to the multiple detection beams, so that the detection beam passes through the corresponding second lens, and the detection beam from the second lens passes through the corresponding first lens and then emerges, and further enters the lens assembly, and the lens assembly is used to image the multiple detection beams from the first lens array on the target eye, respectively, and to image the multiple return beams from the target eye on the first lens array, respectively.

[0021] In some embodiments, the optical transmission module also includes a lens assembly, and the first lens array and the second lens array are sequentially arranged between the lens assembly and the imaging module, and the lens assembly is used to image the multiple detection light beams from the light source module on the target eye respectively, and to image the multiple return light beams from the target eye respectively.

[0022] In some embodiments, the optical transmission module includes:

[0023] A third lens array is arranged at one end of the light transmission module close to the target eye, and includes a plurality of third lenses arranged in parallel, so that the detection light beam is incident on the target eye after passing through the third lenses, and the return light beam is transmitted after passing through the third lenses, and the third lens is used to correct the defocus difference introduced by the optical path difference between the plurality of detection light beams and / or the defocus difference introduced by the optical path difference between the plurality of return light beams;

[0024] Alternatively, the optical transmission module comprises:

[0025] A third diffractive optical element is arranged at one end of the optical transmission module close to the target eye, and is used to make the multiple detection light beams incident on the third diffractive optical element in a parallel form enter the target eye from the pupil of the target eye respectively after passing through the third diffractive optical element, and further enter different positions of the fundus of the target eye respectively, and is used to correct the defocus difference introduced by the optical path difference between the multiple detection light beams.

[0026] In some embodiments, it further comprises:

[0027] The light blocking member is used to block the detection light beam propagating along the optical axis of the light transmission module, so that the multiple detection light beams emitted from the light transmission module form a dark area at the optical axis of the light transmission module.

[0028] In some embodiments, the optical transmission module includes:

[0029] A focusing assembly, used to allow the multiple return light beams to pass through the focusing assembly respectively, and the diopter of the focusing assembly is adjustable to adjust the vergence of the return light beams after passing through the focusing assembly, so that the size of the light spot formed by the imaging when the return light beams are incident on the imaging module can be changed;

[0030] The imaging module is used for acquiring the multiple return light beams when the focusing assembly is at any diopter, and generating the light spot array image corresponding to the current diopter based on the multiple return light beams;

[0031] The refraction detection system also includes:

[0032] A data processing module is connected to the imaging module and is used to obtain the refractive power information of the position corresponding to the light spot on the retina of the target eye for any light spot in the light spot array image according to the change of the light spot in the light spot array image corresponding to different refractive powers.

[0033] It can be seen from the above technical scheme that a refractive detection system provided by the present invention includes: a light source module, at least including a light source and a first diffractive optical element, the first diffractive optical element is arranged on the light output side of the light source, and is used to split the original light beam emitted by the light source into multiple detection light beams, so that the light source module emits multiple parallel detection light beams, and the multiple detection light beams are transmitted to the light transmission module in a parallel form; the light transmission module is used to make the multiple detection light beams respectively incident on the target eye and respectively incident on different positions of the fundus of the target eye, so that different positions of the fundus of the target eye respectively generate return light beams, and obtain multiple return light beams from the target eye and transmit the multiple return light beams in a parallel form to the imaging module; the imaging module is used to obtain the multiple return light beams and generate a spot array image based on the multiple return light beams.

[0034] The beneficial effect of the present invention is that the refractive detection system allows multiple parallel detection light beams to be incident on the target eye respectively, and respectively incident on different positions of the fundus of the target eye, and obtains the return light beams generated by different positions of the fundus of the target eye and generates a spot array image based on the return light beams. Therefore, the refractive detection system can simultaneously obtain the images formed by the light beams at different positions on the retina, and based on this, it can simultaneously realize the measurement of wide-area retinal refractive power topography and the evaluation of retinal imaging contrast. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of a refraction detection system provided by a first embodiment of the present invention;

[0037] Figure 2 A schematic diagram of a refraction detection system provided in accordance with a second embodiment of the present invention.

[0038] The reference numerals in the drawings of the specification include:

[0039] 1-light source, 2-first diffractive optical element, 3-second diffractive optical element, 4-first spectroscopic element, 5-first lens array, 6-second lens array, 7-first fixed reflecting element, 8-second fixed reflecting element, 9-first movable reflecting element, 10-second movable reflecting element, 11-fourth lens group, 12-fifth lens group, 13-third diffractive optical element, 14-third lens array, 15-second spectroscopic element, 16-sixth lens group, 17-imaging surface, 18-detection unit, 20-target eye, 21-light source module, 22-focusing assembly, 23-lens assembly. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] This embodiment provides a refraction detection system, including:

[0042] A light source module, comprising at least a light source and a first diffractive optical element, wherein the first diffractive optical element is arranged at the light output side of the light source, and is used to separate the original light beam emitted by the light source into a plurality of detection light beams, so that the light source module emits a plurality of parallel detection light beams, and the plurality of detection light beams are transmitted to the light transmission module in a parallel form;

[0043] The optical transmission module is used to make the multiple detection light beams incident on the target eye and incident on different positions of the fundus of the target eye respectively, so that the different positions of the fundus of the target eye generate return light beams respectively, and obtain the multiple return light beams from the target eye and transmit the multiple return light beams to the imaging module in parallel;

[0044] The imaging module is used to acquire the multiple return light beams and generate a light spot array image based on the multiple return light beams.

[0045] The light source emits an original light beam, which is incident on the first diffractive optical element. The first diffractive optical element divides the original light beam emitted by the light source into multiple detection light beams, so that the light source module can emit multiple parallel detection light beams, so that the multiple detection light beams are transmitted to the light transmission module in a parallel form. The light transmission module makes the multiple detection light beams respectively enter the target eye and respectively enter different positions of the fundus of the target eye, and the different positions of the fundus of the target eye respectively generate return light beams. The light transmission module obtains multiple return light beams from the target eye, and transmits the multiple return light beams to the imaging module in a parallel form. The imaging module obtains the multiple return light beams and generates a light spot array image based on the multiple return light beams. The light spot array image refers to an image including multiple light spots arranged in an array, and any light spot is an image formed by a return light beam generated by a corresponding position of the fundus of the target eye.

[0046] Therefore, the refractive detection system of this embodiment can simultaneously obtain images formed by light beams at different positions on the retina, and based on this, it can simultaneously realize wide-area retinal refractive power topography measurement and retinal imaging contrast evaluation.

[0047] The first diffractive optical element splits the original light beam emitted by the light source in two dimensions to produce a plurality of detection light beams. In some embodiments, the first diffractive optical element can split the original light beam into a plurality of detection light beams with equal intensity. In other embodiments, the first diffractive optical element can also split the original light beam into a plurality of detection light beams with unequal intensity, which can be set according to measurement requirements. In this embodiment, there is no limitation on the number of the plurality of detection light beams, and there is no limitation on the arrangement form of the plurality of detection light beams. In practical applications, it can be set according to the measurement requirements of different positions on the retina of the target eye. After determining the number of the plurality of detection light beams and the arrangement form of the plurality of detection light beams, a suitable first diffractive optical element can be selected to implement it.

[0048] In some embodiments, the light source module further includes: a collimating assembly, which is arranged on the light-emitting side of the first diffractive optical element, and is used to make the multiple detection light beams pass through the collimating assembly and then be emitted in parallel. The multiple detection light beams emitted by the first diffractive optical element are respectively incident on the collimating assembly, and the multiple detection light beams pass through the collimating assembly and then be emitted in parallel. The collimating assembly can make the multiple detection light beams emit in a parallel and parallel form. In some embodiments, the collimating assembly includes at least one lens, including but not limited to a convex lens or a concave lens.

[0049] In some embodiments, the collimation component may include a second diffractive optical element. Specifically, the light source module further includes: a second diffractive optical element, which is arranged on the light-emitting side of the first diffractive optical element, and is used to make the multiple detection light beams pass through the second diffractive optical element and then be emitted in parallel. The multiple detection light beams are respectively incident on different positions of the second diffractive optical element, and the multiple detection light beams pass through the second diffractive optical element and then be emitted in parallel. The second diffractive optical element can make the multiple detection light beams be emitted in parallel and parallel form. The second diffractive optical element changes the propagation direction of the light beam without changing the optical properties of the light beam. If the collimation component included in the light source module only uses a lens, in order to make the multiple detection light beams pass through and then be emitted in parallel, a larger number of lenses will need to be used. In comparison, the light source module uses a second diffractive optical element to make the multiple detection light beams pass through and then be emitted in parallel, so that the number of elements used can be reduced.

[0050] For example, reference may be made to Figure 1 or Figure 2 , Figure 1 A schematic diagram of a refraction detection system provided in the first embodiment, Figure 2 FIG. 1 is a schematic diagram of a refraction detection system provided in the second embodiment. Figure 1 or Figure 2 As shown, the first diffractive optical element 2 and the second diffractive optical element 3 are sequentially arranged on the light path of the light source 1, and the first diffractive optical element 2 performs two-dimensional beam splitting on the original light beam emitted by the light source 1 to separate multiple detection beams. The multiple detection beams are respectively incident on different positions of the second diffractive optical element 3, and the second diffractive optical element 3 causes the multiple detection beams to be emitted in parallel.

[0051] In some embodiments, the optical transmission module includes: a focusing component 22, which is used to make the multiple return light beams pass through the focusing component 22 respectively, and the diopter of the focusing component 22 is adjustable to adjust the convergence of the return light beam after passing through the focusing component 22, so that the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be changed. In this embodiment, the convergence of the return light beam after passing through the focusing component 22 can be adjusted by the focusing component 22, and the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be adjusted accordingly, so that the light spot array images can be obtained respectively when the return light beam is imaged as a light spot of different sizes. That is, the light spot array images of different spot sizes can be obtained as the diopter of the focusing component 22 changes. In this embodiment, the structure of the focusing component 22 is not limited, as long as the convergence of the return light beam can be changed, so that the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be changed.

[0052] In some embodiments, the optical transmission module may include:

[0053] A focusing assembly 22, used to allow the multiple return light beams to pass through the focusing assembly 22 respectively, and the diopter of the focusing assembly 22 is adjustable to adjust the vergence of the return light beams after passing through the focusing assembly 22, so that the size of the light spot formed by the imaging when the return light beams are incident on the imaging module can be changed;

[0054] The lens assembly 23 and the focusing assembly 22 are arranged between the light source module 21 and the lens assembly 23, and the lens assembly 23 is used to image the multiple detection light beams from the focusing assembly 22 respectively on the target eye 20, and is also used to image the multiple return light beams from the target eye 20 respectively on the focusing assembly 22.

[0055] The lens assembly 23 includes at least two lenses. Specifically, the lens assembly 23 can image the multiple detection light beams from the focusing assembly 22 onto the pupils of the target eye 20 respectively.

[0056] In some embodiments, the optical transmission module may further include: a first beam splitter element 4, which is disposed at the intersection of the light output path of the light source module 21 and the light input path of the imaging module, and the first beam splitter element 4 is used to separate the multiple return beams from the optical transmission module from the multiple detection beams emitted by the light source module 21, so that the multiple detection beams emitted by the light source module 21 are transmitted to the optical transmission module, and the multiple return beams from the optical transmission module are transmitted to the imaging module. For example, reference may be made to Figure 1As shown, the multiple detection beams from the light source module 21 are transmitted to the first beam splitter element 4, the first beam splitter element 4 reflects the multiple detection beams to the focusing component 22 respectively, and the first beam splitter element 4 allows the multiple return beams from the light transmission module to pass through and be transmitted to the imaging surface 17. The light transmission module includes a focusing component 22 and a lens component 23, the multiple detection beams from the light source module 21 pass through the focusing component 22 respectively and are transmitted to the lens component 23, the lens component 23 allows the multiple detection beams from the focusing component 22 to be imaged on the target eye 20 respectively, and also allows the multiple return beams from the target eye 20 to be transmitted to the focusing component 22 respectively.

[0057] In some embodiments, the optical transmission module may include:

[0058] A first lens array 5, comprising a plurality of first lenses arranged in parallel, wherein the first lenses of the plurality of first lenses correspond one-to-one to the plurality of return light beams, so that the return light beams pass through the corresponding first lenses;

[0059] A second lens array 6, comprising a plurality of second lenses arranged in parallel, wherein the second lenses of the plurality of second lenses correspond one-to-one to the first lenses of the plurality of first lenses, so that the return light beams from the first lenses are emitted after passing through the corresponding second lenses;

[0060] The distance between the first lens and the corresponding second lens along the optical path can be changed, so that the convergence of the return light beam after passing through the corresponding first lens and second lens can be changed, so that the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be changed.

[0061] The distance between the first lens and the corresponding second lens along the optical path changes, which can change the relative position between the back focus of the first lens and the front focus of the corresponding second lens, thereby changing the vergence of the return light beam after passing through the corresponding first lens and second lens. The first lens array 5 and the second lens array 6 constitute a focusing assembly 22.

[0062] By simultaneously changing the distances between the multiple first lenses and the multiple second lenses along the optical path, the size of the light spots formed when the multiple return light beams are incident on the imaging module can be adjusted simultaneously. In addition, the first lens and the second lens correspond to the return light beams one by one, which can ensure that the convergence of each return light beam is adjusted by the corresponding first lens and the second lens, respectively, and the offset and overlap between the return light beams can be reduced. Using two sets of conjugated lens arrays, each lens corresponds to a field of view, which can avoid the problems of cross-interference of light rays, changes in imaging magnification, and the problem of being unable to perform independent optical analysis on each field of view.

[0063] In some embodiments, the optical transmission module may further include a first fixed reflective element 7, a first movable reflective element 9, a second movable reflective element 10, and a second fixed reflective element 8, wherein the first fixed reflective element 7, the first movable reflective element 9, the second movable reflective element 10, and the second fixed reflective element 8 are sequentially arranged along the optical path from the first lens array 5 to the second lens array 6, so that the multiple return light beams from the first lens array 5 pass through the first fixed reflective element 7, the first movable reflective element 9, the second movable reflective element 10, and the second fixed reflective element 8 in sequence; the first movable reflective element 9 and the second movable reflective element 10 can be moved along the optical path respectively, so that the distance between the first lens and the corresponding second lens along the optical path can be changed. Among them, the first movable reflective element 9 and the second movable reflective element 10 can be moved along the optical path respectively, so that the distance between the first lens array 5 and the second lens array 6 along the optical path can be changed, so that the distance between the first lens and the corresponding second lens along the optical path can be changed.

[0064] For example, reference may be made to Figure 1 As shown, a first fixed reflective element 7, a first movable reflective element 9, a second movable reflective element 10 and a second fixed reflective element 8 are sequentially arranged along the optical path from the first lens array 5 to the second lens array 6. A plurality of return light beams from the first lens array 5 are sequentially reflected by the first fixed reflective element 7, the first movable reflective element 9, the second movable reflective element 10 and the second fixed reflective element 8 and transmitted to the second lens array 6. The first movable reflective element 9 and the second movable reflective element 10 can be respectively moved vertically, that is, the relative position between the back focus of any first lens of the first lens array 5 and the front focus of the corresponding second lens in the second lens array 6 can be adjusted, that is, the vergence of any return light beam after passing through the corresponding first lens and second lens can be adjusted.

[0065] The first fixed reflective element 7 , the first movable reflective element 9 , the second movable reflective element 10 and the second fixed reflective element 8 may be reflective mirrors, respectively.

[0066] In some embodiments, the second lens array 6 and the first lens array 5 are sequentially arranged between the light source module 21 and the lens assembly 23, and the second lenses of the plurality of second lenses correspond to the plurality of detection beams one by one, so that the detection beams pass through the corresponding second lenses, and the detection beams from the second lenses are emitted after passing through the corresponding first lenses, and further incident on the lens assembly 23, and the lens assembly 23 is used to image the plurality of detection beams from the first lens array 5 respectively on the target eye 20, and to image the plurality of return beams from the target eye 20 respectively on the first lens array 5. For example, reference may be made to Figure 1 As shown, the multiple detection beams from the light source module 21 sequentially pass through the second lens array 6, the second fixed reflective element 8, the second movable reflective element 10, the first movable reflective element 9, the first fixed reflective element 7 and the first lens array 5 and then emerge. The lens assembly 23 can specifically image the multiple detection beams from the first lens array 5 on the pupil of the target eye 20 respectively. The lens assembly 23 can make the front focus of the first lens of the first lens array 5 (that is, the focus of the first lens on the side close to the lens assembly 23) conjugate with the pupil of the target eye 20, so that the detection beam from the first lens of the first lens array 5 is imaged on the pupil of the target eye 20. The lens assembly 23 also images the multiple return beams from the target eye 20 on the first lens array 5.

[0067] In some embodiments, the lens assembly 23 may include a fourth lens group 11 and a fifth lens group 12, the fourth lens group 11 is used to converge the multiple detection beams from the first lens array 5 and further enter the fifth lens group 12, the fifth lens group 12 is used to make the multiple detection beams emerge in parallel, the fourth lens group 11 and the fifth lens group 12 may constitute a 4f system, the fourth lens group 11 and the fifth lens group 12 are a pair of conjugate lens groups. The fourth lens group 11 includes at least one lens, and the fifth lens group 12 includes at least one lens.

[0068] In some embodiments, the optical transmission module may include:

[0069] A focusing assembly 22, used to allow the multiple return light beams to pass through the focusing assembly 22 respectively, and the diopter of the focusing assembly 22 is adjustable to adjust the vergence of the return light beams after passing through the focusing assembly 22, so that the size of the light spot formed by the imaging when the return light beams are incident on the imaging module can be changed;

[0070] The lens assembly 23 and the focusing assembly 22 are arranged between the lens assembly 23 and the imaging module. The lens assembly 23 is used to image the multiple detection light beams from the light source module 21 on the target eye 20 respectively, and is also used to image the multiple return light beams from the target eye 20 on the focusing assembly 22 respectively.

[0071] The lens assembly 23 includes at least two lenses. Specifically, the lens assembly 23 can image the multiple detection light beams from the light source module 21 onto the pupils of the target eye 20 respectively.

[0072] In this embodiment, if the focusing assembly 22 includes a first lens array 5 and a second lens array 6, the first lens array 5 and the second lens array 6 are sequentially arranged between the lens assembly 23 and the imaging module, and the lens assembly 23 is used to make the multiple return light beams from the target eye 20 be imaged on the first lens array 5 respectively.

[0073] In some embodiments, the lens assembly 23 may include a fourth lens group 11, a fifth lens group 12, and a sixth lens group 16; the optical transmission module may further include a second beam splitter 15, which is disposed between the fourth lens group 11 and the fifth lens group 12 and between the fifth lens group 12 and the sixth lens group 16, and the second beam splitter 15 is used to transmit the multiple detection beams from the fourth lens group 11 to the fifth lens group 12, and to transmit the multiple return beams from the fifth lens group 12 to the sixth lens group 16. The fourth lens group 11 and the fifth lens group 12 are used to image the multiple detection beams from the light source module 21 on the target eye 20, and the fifth lens group 12 and the sixth lens group 16 are used to image the multiple return beams from the target eye 20 on the focusing assembly 22. In this way, the multiple return beams from the target eye 20 are separated from the multiple detection beams from the light source module 21.

[0074] The fourth lens group 11 includes at least one lens, the fifth lens group 12 includes at least one lens, and the sixth lens group 16 includes at least one lens.

[0075] In some embodiments, the fourth lens group 11 is used to converge the multiple detection light beams from the light source module 21, the second spectroscopic element 15 can be set at the rear focus of the fourth lens group 11, and the fifth lens group 12 is used to make the multiple detection light beams emerge in a parallel form. The fourth lens group 11 and the fifth lens group 12 can constitute a 4f system, and the fourth lens group 11 and the fifth lens group 12 are a pair of conjugate lens groups.

[0076] The fifth lens group 12 is used to converge the multiple return light beams from the target eye 20, the second beam splitter 15 can be arranged at the front focus of the fifth lens group 12, and the sixth lens group 16 is used to make the multiple return light beams emerge in parallel and further transmit to the focusing assembly 22. The fifth lens group 12 and the sixth lens group 16 can form a 4f system, and the fifth lens group 12 and the sixth lens group 16 are a pair of conjugate lens groups.

[0077] For example, reference may be made to Figure 2As shown, the multiple detection beams from the light source module 21 are transmitted to the fourth lens group 11, and then transmitted to the second beam splitter 15 after passing through the fourth lens group 11. The second beam splitter 15 allows the multiple detection beams to pass through and transmit to the fifth lens group 12, so as to further image the target eye 20. The multiple return beams from the target eye 20 are transmitted to the fifth lens group 12, and then transmitted to the second beam splitter 15 after passing through the fifth lens group 12. The second beam splitter 15 reflects the multiple return beams to the sixth lens group 16, so that the multiple return beams are respectively imaged on the first lens array 5. The first movable reflective element 9 and the second movable reflective element 10 can be respectively moved in the lateral direction, that is, the relative position between the rear focus of any first lens of the first lens array 5 and the front focus of the corresponding second lens in the second lens array 6 can be adjusted, that is, the convergence of any return beam after passing through the corresponding first lens and second lens can be adjusted, and the size of the light spot formed when the return beam is incident on the imaging module can be adjusted.

[0078] In some embodiments, the optical transmission module may include: a converging component, which is disposed at one end of the optical transmission module close to the target eye 20, and is used to converge the multiple detection light beams incident on the converging component in parallel, so that the multiple detection light beams enter the target eye 20 from the pupil of the target eye 20 and further respectively enter different positions of the fundus of the target eye 20. The multiple parallel detection light beams converge after passing through the converging component, and all enter the target eye 20 from the pupil of the target eye 20. After entering the target eye 20, the multiple detection light beams are respectively incident on different positions of the fundus of the target eye 20. In some embodiments, the converging component may include at least one lens, including but not limited to a convex lens or a concave lens.

[0079] In some embodiments, the converging assembly may include a third diffractive optical element, and specifically, the optical transmission module may include: a third diffractive optical element 13, which is disposed at one end of the optical transmission module close to the target eye 20, and is used to allow the multiple detection light beams incident on the third diffractive optical element 13 in a parallel form to enter the target eye 20 from the pupil of the target eye 20 respectively after passing through the third diffractive optical element 13, and further respectively enter different positions of the fundus of the target eye 20. The third diffractive optical element 13 changes the transmission direction of the multiple detection light beams transmitted in a parallel form, so that the multiple detection light beams transmitted in a parallel form can all be incident on the pupil of the target eye 20, and can all be incident on the target eye 20 from the pupil of the target eye 20. The third diffractive optical element 13 changes the propagation direction of the light beam without changing the optical characteristics of the light beam. If the converging component uses a lens, in order to make the multiple detection light beams enter the pupil of the target eye 20, a larger number of lenses may be needed. In comparison, the optical transmission module uses a third diffraction optical element to make the multiple detection light beams enter from the pupil of the target eye 20 and enter the target eye 20 and respectively enter different positions of the fundus, which can reduce the number of elements used.

[0080] In some embodiments, the optical transmission module may include: a third lens array 14, which is disposed at one end of the optical transmission module close to the target eye 20, including a plurality of third lenses arranged in parallel, so that the detection light beam is incident on the target eye 20 after passing through the third lens and the return light beam is transmitted after passing through the third lens, and the third lens is used to correct the defocus difference introduced by the optical path difference between the plurality of detection light beams or / and the defocus difference introduced by the optical path difference between the plurality of return light beams. Since the optical path of the light beam passing through the periphery of the optical element and the center of the optical element will be different, this will cause the light beam to arrive at the retina of the target eye 20 or arrive at the imaging surface 17 of the refractive detection system. For example, the optical path of the light beam passing through the periphery of the optical element is greater than the optical path of the light beam passing through the center of the optical element. Then, the defocus difference introduced by the optical path difference between the plurality of detection light beams or / and the defocus difference introduced by the optical path difference between the plurality of return light beams are corrected by each lens of the third lens array 14.

[0081] In some embodiments, the optical transmission module may include: a third diffractive optical element, which is disposed at one end of the optical transmission module close to the target eye 20, and is used to allow the multiple detection light beams incident on the third diffractive optical element in a parallel form to enter the target eye 20 from the pupil of the target eye 20 respectively after passing through the third diffractive optical element, and further respectively enter different positions of the fundus of the target eye 20, and to correct the defocus difference introduced by the optical path difference between the multiple detection light beams or / and the defocus difference introduced by the optical path difference between the multiple return light beams. The third diffractive optical element is used to change the transmission direction of the multiple detection light beams transmitted in a parallel form, so that the multiple detection light beams transmitted in a parallel form can all be incident on the pupil of the target eye 20, and can all be incident on the target eye 20 from the pupil of the target eye 20. Furthermore, since the optical path lengths of the light beams passing through the periphery of the optical element and the center of the optical element are different, this will cause a defocus difference when the light beams reach the retina of the target eye 20 or the imaging surface 17 of the refractive detection system. For example, the optical path length of the light beams passing through the periphery of the optical element is greater than the optical path length of the light beams passing through the center of the optical element. Then, the defocus difference introduced by the optical path length difference between the multiple light beams is corrected by the third diffractive optical element. In this embodiment, the third diffractive optical element not only plays a role in changing the propagation direction of the light beam, but also plays a role in modulating the light beam.

[0082] In some embodiments, the refractive detection system may further include: a light blocking member for blocking the detection light beam propagating along the optical axis of the optical transmission module, so that the multiple detection light beams emitted from the optical transmission module form a dark area at the optical axis of the optical transmission module. In order to facilitate the target eye 20 to fix the gaze position, the visual axis of the target eye 20 is made to coincide with the optical axis of the refractive detection system, and the light beam propagation at the optical axis can be closed, forming a situation where the peripheral field of view is filled with light spots, while the central field of view is dark. The central field of view can be a field of view with a radius of ≤5°. In some embodiments, the light blocking member can be arranged on one side of the second diffractive optical element 3, and the light blocking member can be but not limited to a spiral phase plate, or other optical components that change the intensity distribution of the light beam, converting the light beam into a light ring with a central dark hole, so as to facilitate the subject to fix the viewing angle. The spiral phase plate can be embedded in the center / front / back of the diffractive lens.

[0083] In some embodiments, the imaging module may include: an imaging surface 17 for receiving the multiple return light beams; and a detection unit 18 for acquiring an image of the imaging surface 17 to obtain a spot array image. In some embodiments, the imaging surface 17 is used to allow the return light beam incident on the imaging surface 17 to at least partially pass through the imaging surface 17, so that the light beam passing through the imaging surface 17 is incident on the detection unit 18. The imaging surface 17 may be a semi-transparent film, a semi-mirror, a scale plate, or a pinhole array plate with diffuse reflection performance. In some embodiments, the imaging surface 17 is used to reflect the return light beam incident on the imaging surface 17, and the imaging module further includes a third spectroscopic element for projecting the image formed by the reflection of the imaging surface 17 to the detection unit 18. The imaging surface 17 may be an opaque diffuse reflection surface, and an additional spectroscopic element is introduced so that the image formed by the diffuse reflection surface is observed by the detection unit 18. The third spectroscopic element may be a beam splitter.

[0084] In some embodiments, the refractive detection system may further include: a data processing module connected to the imaging module, for obtaining the refractive power information of multiple positions of the retina of the target eye 20 according to each light spot in the light spot array image.

[0085] In some embodiments, the optical transmission module may include: a focusing component 22, which is used to make the multiple return light beams pass through the focusing component 22 respectively, and the diopter of the focusing component 22 is adjustable to adjust the convergence of the return light beam after passing through the focusing component 22, so that the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be changed. The imaging module is used to obtain the multiple return light beams when the focusing component 22 is at any diopter, and generate the light spot array image corresponding to the current diopter based on the multiple return light beams; the data processing module is used to obtain the diopter information of the position corresponding to the light spot on the retina of the target eye 20 for any light spot in the light spot array image according to the change of the light spot in the light spot array image corresponding to different diopters.

[0086] The data processing module is used to obtain the diopter information of the position corresponding to the light spot on the retina of the target eye 20 for any light spot in the light spot array image according to the imaging contrast and / or the change of the strongest pixel value of the light spot in the light spot array image corresponding to different diopters. Thus, a wide-area retinal diopter topography of the target eye 20 can be obtained.

[0087] In some embodiments, the refractive detection system may further include: a data processing module connected to the imaging module, for obtaining, for any light spot in the light spot array image, an imaging contrast of a position corresponding to the light spot on the retina of the target eye 20 according to the light spot. Any light spot in the light spot array image may reflect the point spread characteristics of the return light beam generated at the position corresponding to the light spot on the retina of the target eye 20, for example, the point spread characteristics may be characterized by a point spread function, based on which relevant information of the retinal imaging contrast of the position corresponding to the light spot on the retina of the target eye 20 may be obtained.

[0088] In some embodiments, the data processing module is also used to obtain, for any light spot in the light spot array image, the imaging contrast of the position corresponding to the light spot in the light spot array image at different refractive powers on the retina of the target eye 20, that is, for any measurement position on the retina of the target eye 20, relevant information on the retinal imaging contrast of the measurement position at different refractive powers can be obtained.

[0089] The light source may be a laser. The detection unit 18 may be a detector. The first light splitting element 4 may be a beam splitter, and the second light splitting element 15 may be a beam splitter.

[0090] for Figure 1 In the structure shown, the light source is placed in front of the focusing assembly 22, so that the light incident on the target eye 20 has the optical characteristics assigned by the focusing assembly 22. In this way, when there is refractive error in the target eye 20, the target eye 20 can observe the focusing and divergence process of the light during the focusing process, and at a certain moment, a well-focused light spot can be observed in the central or peripheral visual field of the subject. This characteristic can be used for scientific research related to the visual field. The disadvantage of this structure is that the light flux entering the eye is easily limited by the lens size of the lens array in the focusing assembly 22, and light beams from different fields of view may enter the lenses belonging to adjacent fields of view, interfering with the measurement results.

[0091] for Figure 2 In the structure shown, the first path (i.e., the light path from the light source to the target eye 20) does not pass through the focusing assembly 22, so the light incident on the target eye 20 will always be 0D collimated light. The advantage is that the light flux entering the eye is higher. The disadvantage is that for subjects with moderate to severe myopia, due to the defocusing of the light, a "continuous diffuse light curtain phenomenon" will be formed in the full field of view, which may interfere with the subject's maintenance of the gaze angle.

[0092] The refraction detection system of this embodiment has the following advantages:

[0093] 1. Fast measurement speed: The measurement speed is not affected by the number of selected retinal sites and the size of the field of view, but depends on the speed of adjusting the diopter;

[0094] 2. Accurate measurement results: ① Through the specially designed optical path, the light beams obtained from different fields of view are less affected by the optical distortion (aberration) of the lens inside the system, and the calibration is simple; ② Due to the introduction of diffraction elements, the total number of lenses required for the system is reduced, thereby reducing the multiple mirror reflections inside the system, and the inspection results are more reliable;

[0095] 3. It can complete the retinal imaging contrast evaluation: Since what is detected is the point spread function (PSF) of the retina, the retinal imaging contrast of different sites on the retina under different optical focusing states can be directly calculated, which is conducive to promoting related myopia research based on optical defocus and contrast theory.

[0096] The above is a detailed introduction to a refractive detection system provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A refraction detection system, characterized in that: include: A light source module, comprising at least a light source and a first diffractive optical element, wherein the first diffractive optical element is arranged at the light output side of the light source, and is used to separate the original light beam emitted by the light source into a plurality of detection light beams, so that the light source module emits a plurality of parallel detection light beams, and the plurality of detection light beams are transmitted to the light transmission module in a parallel form; The optical transmission module is used to make the multiple detection light beams incident on the target eye and incident on different positions of the fundus of the target eye respectively, so that the different positions of the fundus of the target eye generate return light beams respectively, and obtain the multiple return light beams from the target eye and transmit the multiple return light beams to the imaging module in parallel; The imaging module is used to acquire the multiple return light beams and generate a light spot array image based on the multiple return light beams.

2. The refraction detection system according to claim 1, characterized in that: The light source module further includes: The second diffractive optical element is arranged on the light-emitting side of the first diffractive optical element, and is used to make the multiple detection light beams emit in parallel after passing through the second diffractive optical element.

3. The refraction detection system according to claim 1, characterized in that: The optical transmission module comprises: A third diffractive optical element is arranged at one end of the optical transmission module close to the target eye, and is used to allow the multiple detection light beams incident on the third diffractive optical element in a parallel form to enter the target eye from the pupil of the target eye after passing through the third diffractive optical element, and further enter different positions of the fundus of the target eye respectively.

4. The refraction detection system according to claim 1, characterized in that: The optical transmission module comprises: A first lens array, comprising a plurality of first lenses arranged in parallel, wherein the first lenses of the plurality of first lenses correspond one-to-one to the plurality of return light beams, so that the return light beams pass through the corresponding first lenses; A second lens array includes a plurality of second lenses arranged in parallel, wherein the second lenses of the plurality of second lenses correspond one-to-one to the first lenses of the plurality of first lenses, so that the return light beams from the first lenses are emitted after passing through the corresponding second lenses; The distance between the first lens and the corresponding second lens along the optical path can be changed, so that the convergence of the return light beam after passing through the corresponding first lens and second lens can be changed, so that the size of the light spot formed by the imaging when the return light beam is incident on the imaging module can be changed.

5. The refraction detection system according to claim 4, characterized in that: The optical transmission module further comprises a first fixed reflecting element, a first movable reflecting element, a second movable reflecting element, and a second fixed reflecting element, wherein the first fixed reflecting element, the first movable reflecting element, the second movable reflecting element, and the second fixed reflecting element are sequentially arranged along an optical path from the first lens array to the second lens array, so that the plurality of return light beams from the first lens array sequentially pass through the first fixed reflecting element, the first movable reflecting element, the second movable reflecting element, and the second fixed reflecting element; The first movable reflective element and the second movable reflective element are respectively movable along an optical path, so that a distance between the first lens and the corresponding second lens along the optical path can be changed.

6. The refraction detection system according to claim 4, characterized in that: The optical transmission module also includes a lens assembly, the second lens array and the first lens array are sequentially arranged between the light source module and the lens assembly, the second lenses of the multiple second lenses correspond one-to-one to the multiple detection light beams, so that the detection light beam passes through the corresponding second lens, and the detection light beam from the second lens is emitted after passing through the corresponding first lens, and further incident on the lens assembly, and the lens assembly is used to make the multiple detection light beams from the first lens array be imaged on the target eye respectively, and make the multiple return light beams from the target eye be imaged on the first lens array respectively.

7. The refraction detection system according to claim 4, characterized in that: The optical transmission module also includes a lens assembly, wherein the first lens array and the second lens array are sequentially arranged between the lens assembly and the imaging module, and the lens assembly is used to image the multiple detection light beams from the light source module onto the target eye respectively, and to image the multiple return light beams from the target eye onto the first lens array respectively.

8. The refraction detection system according to claim 1, characterized in that: The optical transmission module comprises: A third lens array is arranged at one end of the light transmission module close to the target eye, and includes a plurality of third lenses arranged in parallel, so that the detection light beam is incident on the target eye after passing through the third lenses, and the return light beam is transmitted after passing through the third lenses, and the third lens is used to correct the defocus difference introduced by the optical path difference between the plurality of detection light beams and / or the defocus difference introduced by the optical path difference between the plurality of return light beams; Alternatively, the optical transmission module comprises: A third diffractive optical element is arranged at one end of the optical transmission module close to the target eye, and is used to make the multiple detection light beams incident on the third diffractive optical element in a parallel form enter the target eye from the pupil of the target eye respectively after passing through the third diffractive optical element, and further enter different positions of the fundus of the target eye respectively, and is used to correct the defocus difference introduced by the optical path difference between the multiple detection light beams and / or the defocus difference introduced by the optical path difference between the multiple return light beams.

9. The refraction detection system according to claim 1, characterized in that: Also includes: The light blocking member is used to block the detection light beam propagating along the optical axis of the light transmission module, so that the multiple detection light beams emitted from the light transmission module form a dark area at the optical axis of the light transmission module.

10. The refraction detection system according to claim 1, characterized in that: The optical transmission module comprises: A focusing assembly, used to allow the multiple return light beams to pass through the focusing assembly respectively, and the diopter of the focusing assembly is adjustable to adjust the vergence of the return light beams after passing through the focusing assembly, so that the size of the light spot formed by the imaging when the return light beams are incident on the imaging module can be changed; The imaging module is used for acquiring the multiple return light beams when the focusing assembly is at any diopter, and generating the light spot array image corresponding to the current diopter based on the multiple return light beams; The refraction detection system also includes: A data processing module is connected to the imaging module and is used to obtain the refractive power information of the position corresponding to the light spot on the retina of the target eye for any light spot in the light spot array image according to the change of the light spot in the light spot array image corresponding to different refractive powers.

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