An integrated image measurement system and method for the anterior and posterior segments of the eye

Abstract

The application discloses an integrated image measuring system and method for an anterior segment and a posterior segment of an eye, a sweep frequency light source is used for emitting near infrared light, a coupler is used for proportionally dividing the received near infrared light into two light beams, a first light beam is transported to a reference arm, and a second light beam is transported to a sample arm, the sample arm is used for obtaining a Bessel light beam after the second light beam passes through a diffractive optical element, and the Bessel light beam is focused on the eye after entering a first 4f combined lens and a second 4f combined lens to generate a backscattering light beam, a balanced detector is used for interfering the backscattering light beam with a light beam output by the reference arm, and converting the interfered light beam into an electric signal, a data acquisition card is used for converting the electric signal into a digital signal, and a computer is used for obtaining an integrated image of the anterior segment and the posterior segment of the eye based on the digital signal. The application enables the anterior segment and the posterior segment of the eye to be clearly imaged in the same time period interval in a large focal depth range.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and to, but is not limited to, an integrated image measurement system and method for the anterior and posterior segments of the eye. Background Technology

[0002] Eye screening optometry instruments and ophthalmic biometric analyzers are indispensable equipment in ophthalmic examinations and diagnoses, used to assess multiple parameters such as anterior segment refractive power, corneal curvature, anterior segment structure, and posterior segment tissue structure. These parameters are crucial for the accurate diagnosis of eye diseases such as myopia, hyperopia, astigmatism, cataracts, glaucoma, macular degeneration, and retinal detachment.

[0003] In related technologies, FLIP Mirrors are switched on and off by adjusting a switching switch, with each state representing an imaging position. For example, FLIP Mirrors can achieve fundus focusing imaging when not in use, and anterior segment imaging when in use, or simultaneous scanning source optical coherence tomography (OCT) for coherent imaging of the anterior segment and retina, with anterior and posterior imaging achieved through the beam splitting effect of the PBS. However, multi-path systems require rapid switching of optical paths to achieve imaging at different positions of the eye. If the switching mechanism (such as a flip mirror) is not fast enough, imaging efficiency will decrease, making it unsuitable for applications requiring high frame rates. Furthermore, these components may require maintenance or replacement after prolonged use. Secondly, the system uses optical paths, scanners, and multiple high-precision optical components, resulting in high overall manufacturing costs, limiting its applicability in low-cost applications. The presence of multiple moving components increases mechanical complexity and the likelihood of failure. In such a complex optical path, phase stability may be difficult to maintain; slight mechanical vibrations or temperature changes can lead to changes in optical path and phase, thus affecting the quality of the interference signal.

[0004] Therefore, how to achieve rapid and clear imaging of the anterior and posterior segments within the same time interval within a large focal depth range has become an urgent problem to be solved. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide an integrated image measurement system for the anterior and posterior segments of the eye, which at least solves the problem that related technologies cannot efficiently and clearly image the integrated image of the anterior and posterior segments of the eye.

[0006] According to a first aspect of the present invention, an integrated image measurement system for the anterior and posterior segments of the eye is provided, comprising: a swept frequency light source, a balanced detector, a data acquisition card, a coupler, a reference arm, a sample arm, and a computer, wherein the sample arm comprises a first 4f combined lens, a second 4f combined lens, and a diffractive optical element;

[0007] The frequency-sweeping light source is used to emit near-infrared light;

[0008] The coupler is used to split the received near-infrared light into two beams according to a ratio. The first beam is sent to the reference arm, and the second beam is sent to the sample arm.

[0009] The sample arm is used to obtain a Bessel beam after the second beam passes through the diffractive optical element, and to focus the Bessel beam onto the eye to generate a backscattered beam after the Bessel beam enters the first 4f combined lens and the second 4f combined lens.

[0010] The balanced detector is used to interfere with the backscattered beam and the beam output from the reference arm, and to convert the interfered beam into an electrical signal.

[0011] The data acquisition card is used to convert the electrical signal into a digital signal;

[0012] The computer is used to acquire an integrated image of the anterior and posterior segments of the eye based on the digital signal.

[0013] In a second aspect, embodiments of the present invention provide an integrated image measurement method for the anterior and posterior segments of the eye, applied to an integrated image measurement system for the anterior and posterior segments of the eye as described in the first aspect, comprising:

[0014] The acquired near-infrared light is divided into a first beam and a second beam according to a certain ratio;

[0015] The first beam is passed through the reference arm in the integrated image measurement system to obtain the output beam, and the second beam is passed through the diffractive optical element in the integrated image measurement system to obtain the Bessel beam.

[0016] The Bessel beam is focused onto the eye after passing through the first 4f combined lens and the second 4f combined lens in the integrated image measurement system to produce a backscattered beam.

[0017] The output beam and the backscattered beam are interfered to obtain an interfered beam, and the speed of light after interference is converted into an electrical signal;

[0018] The electrical signal is converted into a digital signal, and an integrated image of the anterior and posterior segments of the eye is obtained based on the digital signal.

[0019] The embodiment of this invention provides an integrated image measurement system for the anterior and posterior segments of the eye, comprising a swept-frequency light source, a balanced detector, a data acquisition card, a coupler, a reference arm, a sample arm, and a computer. The sample arm includes a first 4f combined lens, a second 4f combined lens, and a diffractive optical element. The swept-frequency light source emits near-infrared light. The coupler splits the received near-infrared light into two beams proportionally; the first beam is sent to the reference arm, and the second beam is sent to the sample arm. The sample arm generates a Bessel beam after the second beam passes through the diffractive optical element, and focuses the Bessel beam onto the eye after it enters the first and second 4f combined lenses, generating a backscattered beam. The balanced detector interferes with the backscattered beam and the beam output from the reference arm, converting the interfered beam into an electrical signal. The data acquisition card converts the electrical signal into a digital signal. The computer acquires an integrated image of the anterior and posterior segments of the eye based on the digital signal. This integrated image measurement system for the anterior and posterior segments has a simple structure and requires few components. Beam shaping using diffractive optical elements enables clear focusing and imaging over long focal depths, and phase adjustment further extends the desired depth of focus. Within a large depth of focus, lateral imaging resolution is significantly improved compared to traditional Gaussian beam imaging systems. This extended depth of focus allows imaging of the anterior and posterior segments within the same time interval. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 1 ;

[0022] Figure 2 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 2 ;

[0023] Figure 3 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 3 ;

[0024] Figure 4 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 4 ;

[0025] Figure 5A flowchart illustrating an integrated image measurement method for the anterior and posterior segments of the eye, provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram illustrating the effect of a diffractive optical element provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0029] It should be noted that the terms "first, second, and third" used in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, and third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which these embodiments of the invention pertain. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] like Figure 1 As shown, Figure 1 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 1The integrated image measurement system 100 includes a swept-frequency light source 1, a balanced detector 2, a data acquisition card 3, a coupler 4, a reference arm 5, a sample arm 6, and a computer 7. The sample arm 6 includes a first 4f combined lens 8, a second 4f combined lens 9, and a diffractive optical element 10. The swept-frequency light source 1 emits near-infrared light with a wavelength of 1310 nm, a bandwidth of 100 nm, and an incident spot diameter of 3.0 mm.

[0032] Coupler 4 is used to split the received near-infrared light into two beams according to a ratio. The first beam is sent to the reference arm 5 and the second beam is sent to the sample arm.

[0033] Sample arm 6 is used to obtain a Bessel beam after the second beam passes through the diffractive optical element 10, and to focus the Bessel beam on the eye to generate a backscattered beam after the Bessel beam enters the first 4f combined lens 8 and the second 4f combined lens 9.

[0034] Balanced detector 2 is used to interfere with the backscattered beam and the beam output from the reference arm, and to convert the interfered beam into an electrical signal;

[0035] Data acquisition card 3 is used to convert electrical signals into digital signals;

[0036] Computer 7 is used to acquire integrated images of the anterior and posterior segments of the eye based on digital signals.

[0037] Furthermore, the grating period of the diffraction optical element is d = 8 μm, and the equation of the diffraction grating is formula (1):

[0038]

[0039] In the above formula, λ is the wavelength of the first beam of light, d is the grating constant, that is, the distance between two adjacent gratings, m is the diffraction order (usually the first order, m = 1), and θ is the diffraction angle.

[0040] The depth of focus (non-diffraction distance) DoF of a Bessel beam is given by formula (2):

[0041]

[0042] When the approximation for small angles is tanθ≈sinθ, formula (3) is obtained from formulas (1) and (2):

[0043]

[0044] Among them, the incident light spot radius Therefore, the focal depth of the Bessel beam is given by formula (4):

[0045]

[0046] In equation (4) above, D is the diameter of the incident light spot, which determines the size of the incident light beam.

[0047] Furthermore, the first and second 4f combined lenses alter the size and divergence angle of the second beam. For a linear optical system, the magnification M of the first and second 4f combined lenses can be defined as:

[0048]

[0049] In equation (5) above, f1 and f2 are the focal lengths of the first 4f combined lens and the second 4f combined lens, respectively.

[0050] After the incident light spot diameter D in formula (4) is magnified, D' = M·D, and the diffraction angle changes as follows: Approximate formulas (5) and (6) for small angles:

[0051]

[0052] For small angles, θ≈mλ / d, then the new focal depth of the Bessel beam can be expressed by formula (7):

[0053]

[0054] The final depth of focus of the Bessel beam is obtained by formulas (5) and (7) as formula (8):

[0055]

[0056] For example, to achieve a depth of focus DoF' = 24 mm under the conditions of λ = 1310 nm, m = 1, and D = 3 mm, appropriate parameters need to be selected, including the magnification M, the grating period d, and the lens focal length. With period d = 8 μm, M ≈ 1.619, f1 = 50 mm, f2 = M × f1 = 1.619 × 50 mm ≈ 80.95 mm, and θ = arcsin(0.16375) ≈ 9.43, we obtain DoF' ≈ 24 mm. Since the grating period d, DoF', and f1 are known, substituting them into the above formula yields the values ​​of f2 and θ.

[0057] It is understood that, in the embodiments of the present invention, the integrated image measurement system for the anterior and posterior segments of the eye includes a swept-frequency light source, a balanced detector, a data acquisition card, a coupler, a reference arm, a sample arm, and a computer. The sample arm includes a first 4f combined lens, a second 4f combined lens, and a diffractive optical element. The swept-frequency light source is used to emit near-infrared light. The coupler is used to split the received near-infrared light into two beams proportionally, with the first beam being sent to the reference arm and the second beam being sent to the sample arm. The sample arm is used to obtain a Bessel beam after the second beam passes through the diffractive optical element, and to focus the Bessel beam onto the eye after it enters the first and second 4f combined lenses to generate a backscattered beam. The balanced detector is used to interfere with the backscattered beam and the beam output from the reference arm, and to convert the interfered beam into an electrical signal. The data acquisition card is used to convert the electrical signal into a digital signal. The computer is used to acquire an integrated image of the anterior and posterior segments of the eye based on the digital signal. This integrated image measurement system for the anterior and posterior segments of the eye has a simple structure and requires few components. Beam shaping using diffractive optical elements enables clear focusing and imaging over long focal depths, and phase adjustment further extends the desired depth of focus. Within a large depth of focus, lateral imaging resolution is significantly improved compared to traditional Gaussian beam imaging systems. This extended depth of focus allows imaging of the anterior and posterior segments within the same time interval.

[0058] In some embodiments of the present invention, such as Figure 2 As shown, Figure 2 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 2 ,exist Figure 2 In the reference arm 5, there are a first collimating lens 51, a rotating prism 52 and a reflecting mirror 53. The first beam of light passes through the first collimating lens 51, the rotating prism 52 and the reflecting mirror 53 of the reference arm 5 in sequence. The light emitted from the reflecting mirror 53 then passes through the rotating prism 52 and the first collimating lens 51 in sequence to the coupler 4.

[0059] In some embodiments of the present invention, such as Figure 3 As shown, Figure 3 An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 3 .exist Figure 3 In the sample arm 6, a second collimating lens 61 is also included. The second beam is collimated by the second collimating lens 61. Then, the parallel light enters the diffractive optical element 10 to generate a diffractive beam. The diffractive beam is shaped to obtain a Bessel beam.

[0060] In some embodiments of the present invention, such as Figure 4 As shown, Figure 4An architecture of an integrated image measurement system for the anterior and posterior segments of the eye provided in this embodiment of the invention. Figure 4 .exist Figure 4 In the sample arm 6, there are also a deflectable mirror 62 and an imaging objective lens 63 (L6 in the figure). The first 4f combined lens 8 is composed of a first lens 81 (L3 in the figure) and a second lens 82 (L4 in the figure). The second 4f combined lens 9 is composed of a second lens 82 and a third lens 91 (L5 in the figure). After the Bessel beam enters the first lens 81 and the second lens 82, a specific beam is generated at the focal plane. The specific beam enters the third lens 91, the deflectable mirror 62 and the imaging objective lens 63 in sequence and is focused on the eye (the sample in the figure) to generate a backscattered beam. The backscattered beam enters the imaging objective lens 63, the deflectable mirror 62, the third lens 91, the second lens 82 and the first lens 81, the diffractive optical element 10, the second collimating lens 61 (L2 in the figure) and the coupler 4 again. The coupler 4 transmits the received backscattered beam and the beam output from the reference arm 5 to the balanced detector 2, where L1 is the first collimating lens 51.

[0061] In embodiments of the present invention, such as Figure 5 As shown, Figure 5 This is a schematic flowchart illustrating an integrated image measurement method for the anterior and posterior segments of the eye, provided as an embodiment of the present invention. This integrated image measurement method for the anterior and posterior segments can be applied to the aforementioned integrated image measurement system for the anterior and posterior segments, and will be explained through the following steps.

[0062] S101. The acquired near-infrared light is divided into a first beam and a second beam according to a certain ratio.

[0063] S102. The first beam is passed through the reference arm in the integrated image measurement system to obtain the output beam, and the second beam is passed through the diffractive optical element in the integrated image measurement system to obtain the Bessel beam.

[0064] In an embodiment of the present invention, near-infrared light with a wavelength of 1310 nm, a bandwidth of 100 nm, and an incident spot diameter of 3.0 mm emitted by a swept-frequency light source in an integrated image measurement system is acquired. The acquired near-infrared light is split into a first beam and a second beam proportionally using a coupler. The first beam is passed through a reference arm in the integrated image measurement system to obtain the output beam. The second beam is collimated by a second collimating lens, and then the parallel beam is passed through a diffractive optical element to generate a diffracted beam. The diffracted beam is then shaped to obtain a Bessel beam.

[0065] S103. The Bessel beam is focused onto the eye after passing through the first 4f combined lens and the second 4f combined lens in the integrated image measurement system to generate a backscattered beam.

[0066] In an embodiment of the present invention, the first lens and the second lens form a first 4f combined lens, and the second lens and the third lens form a second 4f combined lens. The Bessel beam is focused onto the eye after passing through the first lens, the second lens, and the third lens in the integrated image measurement system, and then through a deflectable mirror and an imaging objective lens to generate a backscattered beam.

[0067] S104. Interfere the output beam and the backscattered beam to obtain the interferometric beam, and convert the interferometric beam into an electrical signal.

[0068] In an embodiment of the present invention, the output beam and the backscattered beam interfere in the balanced detector of the integrated image measurement system to obtain the interfered beam, which is then further converted into an electrical signal by the balanced detector.

[0069] S105. Convert the electrical signal into a digital signal, and acquire an integrated image of the anterior and posterior segments of the eye based on the digital signal.

[0070] In an embodiment of the invention, the output beam and the backscattered beam interfere in the balanced detector of the integrated image measurement system to obtain an interfered beam. The balanced detector further converts the interfered beam into an electrical signal. The data acquisition card in the integrated image measurement system converts the electrical signal into a digital signal and outputs it to a computer. The computer performs subsequent algorithm calculations to obtain an integrated image of the anterior and posterior segments of the eye.

[0071] Understandably, in the embodiments of the present invention, the acquired near-infrared light is divided into a first beam and a second beam according to a ratio. The first beam is passed through a reference arm in an integrated image measurement system to obtain an output beam, and the second beam is passed through a diffractive optical element in the integrated image measurement system to obtain a Bessel beam. The Bessel beam is then focused onto the eye through a first 4f combined lens and a second 4f combined lens in the integrated image measurement system to generate a backscattered beam. The output beam and the backscattered beam are interfered with to obtain an interference beam, which is then converted into an electrical signal. The electrical signal is further converted into a digital signal, and an integrated image of the anterior and posterior segments of the eye is obtained based on the digital signal. In this method, the desired extended depth of focus is achieved through the introduction of phase adjustment. Within a large depth of focus range, the lateral imaging resolution is significantly improved compared to traditional Gaussian beam imaging systems. Within the extended depth of focus range, imaging of the anterior and posterior segments can be achieved within the same time period. Using a novel phase modulation method and a beam shaping method using diffractive optical elements, clear focusing imaging can be achieved within a long depth of focus range.

[0072] In some embodiments of the present invention, S10 to S11 are included before S102, as described by the following steps.

[0073] S10. Calculate the phase distribution based on the preset target light field and the light field distribution formula at the preset focal plane, and obtain the design results of the microstructure on the surface of the initial diffractive optical element based on the phase distribution.

[0074] In some embodiments of the present invention, the preset target light field is a specific light field distribution obtained on the focal plane (e.g., uniform distribution, specific pattern, etc.). The light field at the focal plane refers to the light intensity and phase distribution formed on the focal plane after light passes through an optical system (such as a lens, lens group, or other focusing element). Simply put, it describes the light characteristics at each point on the focal plane, including brightness (or energy density), color (wavelength), and phase information of the light wave. The phase distribution is calculated by using the preset target light field and the formula for the light field distribution at the preset focal plane. After designing the phase distribution of the initial diffractive optical element, the design result of the microstructure on the surface of the initial diffractive optical element is obtained. The formula for the light field distribution at the preset focal plane is as follows: Formula (9):

[0075]

[0076] In the above formula, t is the transmittance of the diffractive optical element, f is the energy distribution of the incident light field, ρ is the radial coordinate at the back focal plane of the focusing lens, J0 is the zero-order Bessel function, f0 is the focal length of the focusing lens, λ0 is the center wavelength of the incident light, E is the electric field distribution, γ is the position of a point on the diffractive optical element, and r is the radius of the diffractive optical element.

[0077] S11. Coat the base material of the initial diffractive optical element with photoresist, etch the photoresist according to the design results, and remove the photoresist or clean the surface after etching to obtain a diffractive optical element with a microstructure.

[0078] In some embodiments of the present invention, photoresist is coated on the base material (such as glass or quartz) of the initial diffractive optical element, and etching is performed using processes such as photolithography or electron beam etching according to the design results to form the required microstructure. After etching is completed, the photoresist is removed or the surface is cleaned to obtain a diffractive optical element with a microstructure.

[0079] In this process, when a Gaussian beam or collimated beam passes through a pre-designed diffractive optical element, the phase of the beam is modulated to the distribution required for a Bessel beam. Thus, through diffraction and interference, a ring-shaped light field distribution is formed in the far field of the diffractive optical element, generating a Bessel beam with long focal depth and self-reconstruction characteristics.

[0080] In some embodiments of the present invention, such as Figure 6 As shown, Figure 6 This is a schematic diagram illustrating the effect of a diffractive optical element provided in an embodiment of the present invention. Figure 6 In the middle, rx r y Here, r0 represents the rectangular coordinates in the x and y directions, and T represents the spacing between the black and white circles.

[0081] It should be noted that, in the embodiments of the present invention, if the above-described integrated image measurement method for the anterior and posterior segments of the eye is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of the present invention, or the part that contributes to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a magnetic disk, or an optical disk. Thus, the embodiments of the present invention are not limited to any specific hardware and software combination.

[0082] Correspondingly, embodiments of the present invention provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps in the integrated image measurement method for the anterior and posterior segments of the eye as described in any of the above embodiments. Correspondingly, embodiments of the present invention also provide a computer program product, which, when executed by a processor of an electronic device, is used to implement the steps in the integrated image measurement method for the anterior and posterior segments of the eye as described in any of the above embodiments.

[0083] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of the invention, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the invention. The sequence numbers of the above-described embodiments of the invention are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0084] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0085] In the several embodiments provided by this invention, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0086] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0087] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0088] The methods disclosed in the several method embodiments provided by this invention can be arbitrarily combined without conflict to obtain new method embodiments.

[0089] The features disclosed in the several method or device embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0090] The above description is merely an embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated image measurement system for the anterior and posterior segments of the eye, characterized in that, The system includes a swept frequency light source, a balanced detector, a data acquisition card, a coupler, a reference arm, a sample arm, and a computer. The sample arm includes a first 4f combined lens, a second 4f combined lens, a diffractive optical element, a second collimating lens, a deflectable mirror, and an imaging objective lens. The first 4f combined lens is composed of a first lens and a second lens, and the second 4f combined lens is composed of a second lens and a third lens. The frequency-sweeping light source is used to emit near-infrared light; The coupler is used to split the received near-infrared light into two beams according to a ratio. The first beam is sent to the reference arm, and the second beam is sent to the sample arm. The sample arm is used to generate a diffracted beam after the second beam passes through the second collimating lens and the diffractive optical element, and to shape the diffracted beam into a Bessel beam. After the Bessel beam enters the first lens and the second lens, a specific beam is generated at the focal plane. This specific beam then sequentially enters the third lens, the deflectable mirror, and the imaging objective lens, and is focused onto the eye to generate a backscattered beam. The backscattered beam then re-enters the imaging objective lens, the deflectable mirror, the third lens, the second lens, the first lens, the diffractive optical element, the second collimating lens, and the coupler. The coupler is also used to deliver the backscattered beam and the beam output from the reference arm to the balanced detector; The balanced detector is used to interfere with the backscattered beam and the beam output from the reference arm, and to convert the interfered beam into an electrical signal. The data acquisition card is used to convert the electrical signal into a digital signal; The computer is used to acquire an integrated image of the anterior and posterior segments of the eye based on the digital signal.

2. The integrated image measurement system according to claim 1, characterized in that, The frequency sweep light source is used to emit near-infrared light with a wavelength of 1310 nanometers, a bandwidth of 100 nanometers, and an incident spot diameter of 3.0 millimeters.

3. The integrated image measurement system according to claim 1, characterized in that, The sample arm also includes a second collimating lens. The second beam of light passes through the second collimating lens and the diffractive optical element to generate a diffracted beam, and the diffracted beam is shaped to obtain the Bessel beam.

4. A method for integrated image measurement of the anterior and posterior segments of the eye, characterized in that, The method, applied to an integrated image measurement system for the anterior and posterior segments of the eye as described in any one of claims 1 to 3, comprises: The acquired near-infrared light is divided into a first beam and a second beam according to a certain ratio; The first beam of light is passed through the reference arm in the integrated image measurement system to obtain the output beam, and the second beam of light is passed through the second collimating lens and the diffractive optical element to generate a diffractive beam, and the diffractive beam is shaped to obtain the Bessel beam. The Bessel beam is passed through the back focal planes of the first and second lenses to generate a specific beam. The specific beam then sequentially enters the third lens, the deflectable mirror, and the imaging objective lens before being focused onto the eye to generate the backscattered beam. The backscattered beam then re-enters the imaging objective lens, the deflectable mirror, the third lens, the second lens, the first lens, the diffractive optical element, the second collimating lens, and the coupler. The output light beam and the backscattered light beam are transmitted to the balanced detector through the coupler to interfere, resulting in an interfered light beam, and the speed of light after interference is converted into an electrical signal. The electrical signal is converted into a digital signal, and an integrated image of the anterior and posterior segments of the eye is obtained based on the digital signal.

5. The method according to claim 4, characterized in that, Before passing the first beam of light through the reference arm of the integrated image measurement system to obtain the output beam, and passing the second beam of light through the diffractive optical element of the integrated image measurement system to obtain the Bessel beam, the method further includes: The phase distribution is calculated based on the preset target light field and the light field distribution formula at the preset focal plane, and the design results of the microstructure on the surface of the initial diffractive optical element are obtained based on the phase distribution. Photoresist is coated on the base material of the initial diffractive optical element, and etching is performed on the photoresist according to the design results. After etching, the photoresist is removed or the surface is cleaned to obtain the diffractive optical element with a microstructure.

Images