Detection Method, Terminal Device and Medium for Free-Form Refractive Power Distribution of Ophthalmic Lenses

Abstract

The present invention discloses a method for detecting the refractive power distribution of a free-form surface of an ophthalmic lens, a terminal device, and a medium. The method includes: controlling an illumination module to emit uniform illumination light to illuminate the frosted bottom surface of an optical long glass body, using a focusing imaging module to image the frosted bottom surface, and obtaining an image sequence of the frosted bottom surface by adjusting the position of a focusing lens in the focusing imaging module; obtaining a curve of the clarity of images at different positions of the frosted bottom surface changing with the position of the focusing lens according to the image sequence of the frosted bottom surface; determining the refractive compensation differences at different positions of the frosted bottom surface according to the maximum value of the curve, and combining the position correspondence relationship between the to-be-tested free-form surface lens and the frosted bottom surface to obtain the refractive information of different regions of the to-be-tested free-form surface lens, where the refractive information includes spherical power, cylindrical power, and axis. The present invention can achieve accurate and efficient detection of free-form surface lenses.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic detection, and particularly to a method for detecting the refractive power distribution of a free-form surface of an eyeglass lens, a terminal device, and a computer-readable storage medium. Background Art

[0002] Due to its advantages such as an asymmetric surface shape, a flexible spatial layout, and a rich design freedom, free-form surface lenses have been widely developed and applied in the functional lens industry. Their special geometric shape and high-degree-of-freedom design space can also take into account very good imaging quality, providing infinite possibilities for the personalized customization design of lenses.

[0003] However, compared with traditional symmetric single-focus lenses, the high performance of free-form surface lenses depends on the double accuracy of the surface shape, optical power, and position, which poses more complex and demanding requirements for the optical design and manufacturing process of free-form surface lenses. And how to detect and evaluate the surface shape quality of free-form surface lenses is one of the key technologies to ensure and improve the optical function of free-form surface lenses.

[0004] Traditional detection methods for free-form surfaces include laser interferometry, coherent scanning interferometry, Shack-Hartmann wavefront measurement, and chromatic confocal method. However, the above methods have limited surface shape curvature detection ranges, low measurement accuracies, and long time consumption. Summary of the Invention

[0005] The main purpose of the present invention is to provide a method for detecting the refractive power distribution of a free-form surface of an eyeglass lens, a terminal device, and a computer-readable storage medium, aiming to achieve accurate and efficient lens detection.

[0006] To achieve the above purpose, the present invention provides a method for detecting the refractive power distribution of a free-form surface of an eyeglass lens. The detection method is based on the optical imaging principle and is applied to an eyeglass lens refractive power detection system. The eyeglass lens refractive power detection system includes: an illumination module, a test module, and a focusing and imaging module. The free-form surface lens to be tested is placed in the test module, and the position of the free-form surface lens to be tested corresponds to the frosted bottom surface of the optical long strip vitreous body in the test module;

[0007] The detection method includes:

[0008] Controlling the illumination module to emit uniform illumination light to illuminate the frosted bottom surface of the optical long strip vitreous body, using the focusing and imaging module to image the frosted bottom surface, and obtaining an image sequence of the frosted bottom surface by adjusting the position of the focusing lens in the focusing and imaging module;

[0009] According to the image sequence of the frosted bottom surface, obtaining a curve of the clarity of images at different positions of the frosted bottom surface changing with the position of the focusing lens;

[0010] Determine the refractive compensation differences at different positions of the frosted bottom surface according to the maximum value of the variation curve, and combine the positional correspondence between the free-form surface lens to be measured and the frosted bottom surface to obtain the refractive information of different regions of the free-form surface lens to be measured, where the refractive information includes spherical power, cylindrical power, and axis.

[0011] Optionally, the determining the refractive compensation differences at different positions of the frosted bottom surface according to the maximum value of the variation curve and combining the correspondence between the free-form surface lens to be measured and the target region of the frosted bottom surface to obtain the refractive information of different regions of the free-form surface lens to be measured includes:

[0012] For the clarity variation curve of the target region on the free-form surface lens to be measured, obtain the maximum clarity values in different imaging directions.

[0013] According to the maximum clarity values in multiple different imaging directions, obtain the refractive compensation sequences corresponding to the maximum clarity values in different directions.

[0014] Determine the maximum refractive compensation value and the minimum refractive compensation value of the refractive compensation sequence.

[0015] According to the maximum refractive compensation value and the minimum refractive compensation value, determine the refractive information of different regions on the free-form surface lens to be measured.

[0016] Optionally, the method for detecting the refractive power distribution of the free-form surface of the spectacle lens further includes:

[0017] Determine the refractive scanning region of the free-form surface lens to be measured, and the refractive power of the optical strip vitreous body matches the central refractive power of the free-form surface lens to be measured, and the difference between the central refractive power of the free-form surface lens to be measured and the refractive power of the optical strip vitreous body is less than a preset refractive power deviation threshold.

[0018] Optionally, the test module further includes: a multi-axis moving stage mounted at the bottom of the free-form surface lens to be measured;

[0019] The detection method further includes:

[0020] Control the multi-axis moving stage to drive the lens to be measured to be translated to a plurality of preset positions respectively, the illumination module emits uniform illumination light to illuminate the frosted bottom surface of the optical strip vitreous body in the test module, and use the focusing imaging module to perform optical imaging on the frosted bottom surface.

[0021] Optionally, before the step of controlling the multi-axis moving stage to drive the free-form surface lens to be measured to be translated to a plurality of preset positions respectively, it further includes:

[0022] Perform global mesh division on the free-form lens to be measured to obtain multiple lens mesh regions, so as to control the multi-axis moving stage to drive the free-form lens to be measured to be translated to the preset positions corresponding to the lens mesh regions respectively.

[0023] To achieve the above object, the present invention further provides a terminal device, which includes a memory, a processor, and a detection program for the refractive power distribution of the free-form surface of spectacle lenses stored on the memory and executable on the processor. When the detection program for the refractive power distribution of the free-form surface of spectacle lenses is executed by the processor, the steps of the above-mentioned detection method for the refractive power distribution of the free-form surface of spectacle lenses are realized.

[0024] In addition, to achieve the above object, the present invention further provides a computer-readable storage medium, on which a detection program for the refractive power distribution of the free-form surface of spectacle lenses is stored. When the detection program for the refractive power distribution of the free-form surface of spectacle lenses is executed by a processor, the steps of the above-mentioned detection method for the refractive power distribution of the free-form surface of spectacle lenses are realized.

[0025] To achieve the above object, the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the above-mentioned detection method for the refractive power distribution of the free-form surface of spectacle lenses are realized.

[0026] The present invention provides a detection method for the refractive power distribution of the free-form surface of spectacle lenses, a terminal device, a computer-readable storage medium, and a computer program product. By controlling the illumination module to emit uniform illumination light to illuminate the frosted bottom surface of the optical long strip vitreous body, using the focusing imaging module to image the frosted bottom surface, and by adjusting the position of the focusing lens in the focusing imaging module, an image sequence of the frosted bottom surface is obtained; according to the image sequence of the frosted bottom surface, a change curve of the sharpness of images at different positions of the frosted bottom surface with respect to the position of the focusing lens is obtained; according to the maximum value of the change curve, the refractive compensation differences at different positions of the frosted bottom surface are determined, and in combination with the corresponding relationship between the free-form lens to be measured and the target area of the frosted bottom surface, the refractive information of different regions of the free-form lens to be measured is obtained, where the refractive information includes spherical power, cylindrical power, and axis.

[0027] Compared with the free-form surface lens detection method in the prior art, in the present invention, the illumination module can be controlled to emit uniform light, which is sequentially subjected to optical imaging through the frosted bottom surface of the optical vitreous body, the free-form surface lens to be measured, the objective lens, the focusing lens, and the imaging lens, image the frosted bottom surface, and obtain the curve of the clarity of the images at different positions of the frosted bottom surface changing with the position of the focusing lens. Furthermore, the refractive information of the free-form surface lens to be measured can be calculated according to the maximum value of the change curve. It can be seen that the present invention can quickly detect and evaluate the optical characteristics of the free-form surface, realize high-precision detection of the free-form surface lens, and improve the detection efficiency of the free-form surface lens at the same time. On this basis, the present invention can provide reliable data support for the design and manufacture of free-form surface lenses, and ensure the surface quality and lens function diversity of free-form surface lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the hardware operating environment related to the solution of the embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the detection system of the free-form surface refractive power distribution of the spectacle lens in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0030] Figure 3 It is a schematic diagram of the lens refractive detection range in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0031] Figure 4 It is a schematic diagram of the refractive power of the long strip glass in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0032] Figure 5 It is a schematic diagram of the first process in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0033] Figure 6-1 It is a schematic diagram of the movement of the focusing head lens in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0034] Figure 6-2 It is a first schematic diagram of the change curve of the target area imaging in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0035] Figure 7 It is a first schematic diagram of the refractive value matrix in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0036] Figure 8 It is a second schematic diagram of the change curve of the target area imaging in an embodiment of the detection method of the free-form surface refractive power distribution of the spectacle lens of the present invention;

[0037] Figure 9 It is a schematic diagram of the second process of an embodiment of the method for detecting the refractive power distribution of the free-form surface of the spectacle lens of the present invention;

[0038] Figure 10 It is a second schematic diagram of the refractive power value matrix of an embodiment of the method for detecting the refractive power distribution of the free-form surface of the spectacle lens of the present invention;

[0039] Figure 11 It is a schematic diagram of the refractive scanning of the free-form surface lens to be measured in an embodiment of the method for detecting the refractive power distribution of the free-form surface of the spectacle lens of the present invention.

[0040] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] Embodiment 1

[0043] As Figure 1 shown, Figure 1 It is a schematic diagram of the device structure of the hardware operating environment involved in the embodiment solution of the present invention.

[0044] The terminal device in the embodiment of the present invention can be a smart phone, a computer, a server and other network devices, etc. The terminal device in this embodiment can be used to implement the detection of the refractive power distribution of the free-form surface of the spectacle lens to be measured.

[0045] As Figure 1 shown, the terminal device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and optionally the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0046] Those skilled in the art can understand, Figure 1The device structure shown does not limit the detection device for the refractive power distribution of the free-form surface of spectacle lenses, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0047] As Figure 1 shown, the memory 1005, as a computer storage medium, may include an operation, a network communication module, a user interface module, and a detection program for the refractive power distribution of the free-form surface of spectacle lenses. The operation is a program for managing and controlling the hardware and software resources of the device, and supports the operation of the detection program for the refractive power distribution of the free-form surface of spectacle lenses and other software or programs. In Figure 1 the device shown, the user interface 1003 is mainly used for data communication with the client; the network interface 1004 is mainly used for establishing a communication connection with the server; and the processor 1001 can be used to call the detection program for the refractive power distribution of the free-form surface of spectacle lenses stored in the memory 1005 and perform the following operations:

[0048] This embodiment provides a method for detecting the refractive power distribution of the free-form surface of spectacle lenses based on the optical imaging method. An adjustable-focus optical imaging system is used to image the frosted surface at the bottom of the long strip vitreous body 21. After inserting the free-form surface optical lens, by moving the focusing lens, the change curve of the image sharpness at each position of the frosted surface under different focusing parameters is recorded. Combining with the sharpness extreme value criterion, the refractive power distribution of each region of the corresponding free-form surface is obtained. This method can effectively and quickly detect and evaluate the optical characteristics of the free-form surface, and has important guiding value for high-precision free-form surface customization.

[0049] The method for detecting the refractive power distribution of the free-form surface of spectacle lenses of the present invention is applied to a detection system for the refractive power distribution of the free-form surface of spectacle lenses, such as Figure 2 shown. The detection system for the refractive power distribution of the free-form surface of spectacle lenses includes: an illumination module 1, a test module 2, a focusing imaging module 3, and a processing and calculation module 4.

[0050] Among them, as Figure 2 shown, the illumination module 1 includes a light source, a condenser lens group 12, and a light homogenizer 13. The light source 11 is an LED in the infrared or visible band. The condenser lens group 12 and the light homogenizer 13 are placed at the rear end of the light source 11 to ensure that the emitted illumination light is collimated light and the intensity distribution is uniform.

[0051] The test module 2 includes a long strip vitreous body 21 and a to-be-tested free-form surface spectacle lens 22. The long strip vitreous body 21 is made of high-quality optical glass. The front surface of the long strip vitreous body 21 is a polished spherical surface 211, and the radius of curvature and the light passing aperture can be designed according to requirements. The middle part is a long strip cylinder, and the rear surface of the cylinder is a frosted bottom surface 212. The light source 11 of the illumination module 1 can irradiate on the frosted bottom surface 212 of the long strip vitreous body 21 to ensure the brightness of the frosted bottom surface 212.

[0052] The free-form lens 22 to be measured is placed at the rear end of the long strip vitreous body 21. Its distance d is related to the detection range Φ, and θ represents the single-sided field of view, and the following relationship is satisfied:

[0053] φ = 2(d × tanθ + 1.5)

[0054] As Figure 3 shown, the farther the distance, the larger the field of view corresponding to the clear aperture, and the larger the detection range of the free-form refraction of the free-form spectacle lens 22 to be measured.

[0055] In addition, as Figure 4 shown, the refractive power of the long strip vitreous body 21 is closely related to its length l, and the following relationship is satisfied:

[0056]

[0057]

[0058] wherein, l1 is the distance from the object image to the long strip vitreous body 21, n is the refractive index of the long strip vitreous body 21, and r is the curvature radius of the polished surface of the long strip vitreous body 21.

[0059] The focusing imaging module 3 includes an objective lens 31, a focusing lens 32 and an imaging lens 33. The objective lens 31 is located on the front side of the free-form spectacle lens and is used to collect the light rays of the illumination light reflected by the frosted surface of the long strip vitreous body 21. The light rays reflected from any point converge on the sensor 41 of the processing and calculation module 4 after passing through the objective lens 31, the focusing lens 32 and the imaging lens 33 in sequence. Starting from the initial adjustment state, the focusing lens 32 continuously moves, and at the same time, the state of the imaging is continuously adjusted and scanned. The processor 42 of the processing and calculation module 4 records and analyzes the refractive state of the frosted bottom surface 212 of the long strip vitreous body 21 at different positions of the focusing lens 32.

[0060] It can be understood that in the present invention, each step of the method for detecting the free-form refractive power distribution of the spectacle lens in this embodiment can be executed by the processing and calculation module 4.

[0061] Based on the above-mentioned modules of the detection system for the free-form refractive power distribution of the spectacle lens, in this embodiment, the illumination module 1 can be controlled to emit a plurality of uniform unit light beams and project them onto the long strip vitreous body 21. Through the movement of the free-form lens to be measured and the focusing lens 32, the plurality of emitted light beam units are sent to the focusing imaging module 3 for imaging. The processing and calculation module 4 performs refractive compensation calculation on the image units of each area of the free-form lens to be measured, and obtains the actual refractive parameters corresponding to the free-form lens to be measured, such as refractive values, realizing that the refractive parameters of each area of the free-form surface of the spectacle lens can be obtained by single measurement, and at the same time improving the detection efficiency and accuracy.

[0062] Specifically, the detection method for the refractive power distribution of the free-form surface of the spectacle lens in this embodiment is as follows Figure 5 shown, and includes the following steps:

[0063] Step S10, control the illumination module to emit uniform illumination light to illuminate the frosted bottom surface of the optical long vitreous body, use the focusing imaging module to image the frosted bottom surface, and obtain an image sequence of the frosted bottom surface by adjusting the position of the focusing lens in the focusing imaging module;

[0064] In this embodiment, as Figure 2 shown, the processing and calculation module 4 can control the illumination module 1 to emit uniform illumination light, which sequentially passes through the frosted bottom surface 212 of the optical vitreous body (such as the long vitreous body 21), the free-form surface lens to be measured, the focusing imaging module 3, and by changing the position of the focusing lens 32 in the focusing imaging module 3, use the focusing imaging module 3 to image the frosted bottom surface 212 to obtain an image sequence of the imaging of the frosted bottom surface 212.

[0065] Among them, as Figure 6-1 shown, this embodiment can control the continuous movement of the focusing lens 32, while controlling the illumination module 1 to emit uniform light, which sequentially passes through the frosted bottom surface 212 of the optical vitreous body, the free-form surface lens to be measured, the objective lens 31, the focusing lens 32 and the image lens for optical imaging, to obtain an image sequence of at least one target area on the lens.

[0066] It should be noted that in this embodiment, the processing and calculation module 4 includes a sensor 41 and a refractive power compensation calculation and processing unit 42. The sensor 41 can record the image sequence of the imaging of the frosted bottom surface 212, and the refractive power compensation calculation and processing unit 42 can calculate the refractive power distribution of the free-form surface lens 22 to be measured according to this image sequence.

[0067] Step S20, according to the image sequence of the frosted bottom surface, obtain the change curve of the clarity of the images at different positions of the frosted bottom surface with the position of the focusing lens;

[0068] In this embodiment, after the processing and calculation module 4 obtains the image sequence of the imaging of the frosted bottom surface 212, the refractive power compensation calculation and processing unit 42 can calculate the change curve between the clarity of the images at different positions of the frosted bottom surface 212 and the position of the above-mentioned focusing lens 32 according to this image sequence.

[0069] Step S30, according to the maximum value of the change curve, determine the refractive power compensation differences at different positions of the frosted bottom surface, and combine the position correspondence relationship between the free-form surface lens to be measured and the frosted bottom surface to obtain the refractive power information of different regions of the free-form surface lens to be measured, where the refractive power information includes spherical power, cylindrical power and axis.

[0070] In this embodiment, the computer processing module can obtain the maximum value of the above change curve, and then, based on the above maximum value and in combination with the position correspondence between the free-form lens to be measured and the frosted bottom surface 212, obtain the refractive power information of different regions of the free-form lens to be measured, where the refractive power information may include spherical power, cylindrical power, and axis information, etc.

[0071] The free-form lens detection method provided in this embodiment can control the illumination module 1 to emit uniform light, which is sequentially subjected to optical imaging through the frosted bottom surface 212 of the optical vitreous body, the free-form lens to be measured, the objective lens 31, the focusing lens 32, and the imaging lens 33, image the frosted bottom surface 212, and obtain the change curve of the clarity of images at different positions of the frosted bottom surface 212 with respect to the position of the focusing lens 32. Furthermore, based on this change curve, the refractive power distribution of the free-form lens to be measured can be calculated. It can be seen that the present invention can quickly detect and evaluate the optical characteristics of the free-form surface, realizing high-precision detection of the free-form lens while improving the detection efficiency of the free-form lens. On this basis, the present invention can provide reliable data support for the design and manufacture of free-form lenses, ensuring the surface quality and lens function diversity of free-form lenses.

[0072] Embodiment 2

[0073] Furthermore, based on the first embodiment of the detection method for the refractive power distribution of the free-form surface of the spectacle lens of the present invention, a second embodiment of the detection method for the refractive power distribution of the free-form surface of the spectacle lens of the present invention is proposed.

[0074] In this embodiment, a global grid division can be performed on the free-form lens to be measured to obtain a plurality of lens grid regions. The multi-axis moving stage is controlled to drive the free-form lens to be measured to be translated to a plurality of preset positions respectively. The illumination module 1 emits uniform illumination light to illuminate the frosted bottom surface 212 of the optical long vitreous body 21 in the test module 2, and the focusing imaging module 3 is used to perform optical imaging on the frosted bottom surface 212 to obtain an image sequence corresponding to each preset position.

[0075] As Figure 6-2 shown, in this embodiment, imaging clarity analysis is performed on different positions 1, 2, and 3 of the frosted ground. Before inserting the free-form lens to be measured, the positions corresponding to the extreme values of the clarity values of the images at different positions are nearly coincident; after inserting the free-form lens to be measured, the multi-axis moving stage controls the free-form lens to move to a plurality of preset positions. The illumination module 1 emits uniform illumination light to illuminate the frosted bottom surface 212 of the optical long vitreous body 21 in the test module 2, and the focusing imaging module 3 is used to perform optical imaging on the frosted bottom surface 212 to obtain an image sequence corresponding to a certain preset position. From Figure 6-2As can be seen, the position where the imaging clarity extreme value of the frosted bottom surface 212 appears has undergone an obvious translation, that is, the refractive compensation amounts ΔD corresponding to the images at different positions are different, and different refractive compensation amounts ΔD correspond to different positions of the focusing lens 32. It can be seen that there is a very close relationship between the clarity extreme value in the imaging clarity of the frosted bottom surface 212 and the position z of the focusing lens 32.

[0076] On this basis, the refractive parameters corresponding to the images 1, 2, and 3 at different positions can be inversely calculated according to the imaging clarity extreme value, such as the refractive value, and this refractive value is the equivalent spherical power of the free-form lens to be measured. The calculation method of the equivalent spherical power in this embodiment may include: constructing a sequence of refractive compensation amounts according to the refractive compensation amounts ΔD corresponding to multiple target regions, and determining the maximum refractive compensation D in the sequence of refractive compensation amounts max and the minimum refractive compensation D min . At this time, the equivalent spherical power SE = (D max + D min ) / 2.

[0077] Therefore, in this embodiment, after obtaining the refractive values of each target region, a corresponding topographic map can be drawn, and the generated refractive value matrix is as Figure 7 shown. The refractive values in the refractive value matrix are the equivalent spherical powers of different regions of the free-form lens to be measured.

[0078] On this basis, in the above step S30, "determine the refractive compensation differences at different positions of the frosted bottom surface according to the maximum value of the change curve, and combine the position correspondence relationship between the free-form lens to be measured and the frosted bottom surface to obtain the refractive information of different regions of the free-form lens to be measured" may include:

[0079] Step S301, for the clarity change curve of the target region on the free-form lens to be measured, obtain the clarity maximum values in different imaging directions;

[0080] Step S302, according to the imaging clarity maximum values in multiple different imaging directions, obtain a sequence of refractive compensations corresponding to the clarity maximum values in different directions;

[0081] Step S303, according to the maximum refractive compensation and the minimum refractive compensation, determine the refractive information of the target region of the free-form lens to be measured.

[0082] It can be understood that the blur spot refers to the light intensity distribution of the diffraction images formed by an ideal point light source 11 on different cross-sections before and after the image plane after passing through an optical system. The blur spot determines the clarity of imaging. For a completely ideal imaging system, the blur spot on the image plane should be an ideal point. However, the blur spot actually formed after passing through the optical system will evolve into a circle, with the same size of the blur spot in all directions. This means that the clarity distribution in all regions of the image is consistent and corresponds to the same refractive value.

[0083] However, when the spectacle lens contains astigmatic information, it means that there is a deviation in the refractive power in two orthogonal directions, resulting in a cylindrical lens effect. The cylindrical lens effect will cause the blur spot formed on the final image plane of the imaging system to be elliptical, with differences in the blur spots in all directions: the long axis direction of the blur spot corresponds to the lowest imaging clarity, the short axis direction corresponds to the highest imaging clarity, and the imaging clarity in other directions is between the two. For a spectacle lens containing astigmatic information, when controlling the movement of the focusing lens 32 for refractive compensation, due to the different clarity of the blur spots in the astigmatic axis direction and the vertical axis direction of the spectacle lens, it means that the corresponding refractive powers are inconsistent. Therefore, there are also differences in the refractive parameters corresponding to the change curves in different directions.

[0084] On this basis, the processing and calculation module 4 can perform regional imaging on the target area and obtain the imaging clarity of this area imaging in each imaging direction. Furthermore, as Figure 8 shown, according to the imaging clarity of the target area in each imaging direction (such as θ1, θ2,..., θ n ), the change curve between the clarity of the ground glass image corresponding to the target area and the position z of the focusing lens 32 is obtained.

[0085] It can be understood that in this embodiment, according to the description of the above embodiment, there is a corresponding relationship between the refractive compensation amount ΔD and the position z of the focusing lens 32. Through conversion, the change curves in different directions are also closely related to the refractive compensation amount ΔD. Therefore, there is a corresponding relationship between the imaging clarity values in different directions and the focusing position z, and the change curve is as Figure 8 shown.

[0086] Furthermore, in this embodiment, for an image at a certain position on the ground glass surface 212 of the long strip glass, the maximum imaging clarity values of the change curves in each imaging direction are respectively recorded, and then the corresponding refractive compensation sequence {ΔD} is constructed. Among them, for each refractive compensation ΔD in the refractive compensation sequence i , the determination method can be: referring to Figure 3 , the maximum imaging clarity values of the change curves in each direction before and after inserting the free-form surface lens to be measured can be obtained, resulting in multiple ΔD i , and the refractive compensation sequence {ΔD} is constructed based on the multiple ΔD i .

[0087] Furthermore, determine the maximum refractive compensation value D of the refractive compensation sequence max and the minimum refractive compensation value D min .

[0088] It should be noted that the cylindrical lens effect results in the minimum refractive compensation in the axial angle direction, the maximum refractive compensation in the direction perpendicular to the axis, and the axis being equal to the θ value of the corresponding variation curve. Therefore, the refractive parameters such as the spherical power, cylindrical power, and axis information corresponding to a target area can be calculated respectively. min Specifically, for example, calculate the equivalent spherical power SE, spherical power S, cylindrical power C, and axis information A corresponding to the target area. The spherical power S is the minimum refractive compensation value D

[0089] ; the equivalent spherical power SE = (D min + D max ) / 2; the cylindrical power C = D min - D max ; the axis information A is equal to the angle value θ of the variation curve corresponding to the minimum refractive compensation value. min

[0090] It can be seen that in this embodiment, based on the relationship between the imaging clarity in each imaging direction and the refractive compensation, after obtaining the imaging variation curve of the target area, the spherical power, cylindrical power, and axis information of the freeform lens to be measured can be calculated. Therefore, in this embodiment, through the optical imaging method, the refractive parameters such as the spherical power, cylindrical power, and axis information of each area of the freeform lens to be measured can be determined in one test, achieving efficient and accurate testing of the freeform lens.

[0091] Generally speaking, in this embodiment, as Figure 9 shown, it is possible to obtain and record the variation curve of the clarity of images at different positions on the frosted bottom surface with respect to the position of the focusing lens before and after inserting the freeform lens to be measured. Furthermore, calculate the maximum clarity values of the frosted bottom surface in different imaging directions. Then, based on the relationship between the position of the focusing lens and the refractive compensation amount, and the relationship between the refractive compensation amount and the clarity of the frosted bottom surface in different imaging directions, calculate the refractive information of different areas of the freeform lens to be measured, where the refractive information includes spherical power, cylindrical power, and axis direction.

[0092] ​Therefore, in this embodiment, the frosted bottom surface 212 of the long strip vitreous body 21 is imaged respectively to obtain the change curve of the focusing lens position - imaging clarity, and according to the maximum clarity value of this change curve, the refractive information of the freeform lens to be measured is calculated, etc. Therefore, this embodiment can detect the refractive information of the freeform lens by means of optical imaging, significantly improving the detection efficiency of the refractive distribution of the freeform surface of the curved lens, and by constructing the above change curve, exploring the influence of position on imaging clarity, providing data support for the detection of the refractive distribution of the freeform surface of the spectacle lens in the future. In addition, considering the influence of the lens astigmatism information on the lens refractive power, the imaging clarity of the regions in each imaging direction at each position is calculated to obtain the imaging change curve of each target region. Therefore, this embodiment realizes a more accurate detection of the freeform lens.

[0093] In one embodiment, the test module 2 further includes: a multi-axis moving stage, which is mounted at the bottom of the freeform lens to be measured; the detection method further includes:

[0094] Step S40, controlling the multi-axis moving stage to drive the lens to be measured to be translated to a plurality of preset positions respectively, the illumination module emits uniform illumination light to illuminate the frosted bottom surface of the optical long strip vitreous body in the test module, and the focusing imaging module is used to perform optical imaging on the frosted bottom surface.

[0095] In this embodiment, the test module 2 is increased with a multi-axis moving stage for driving the spectacle lens to be measured to translate in the x and y directions.

[0096] On this basis, the processing and calculation module 4 can control the multi-axis moving stage to drive the freeform lens to be measured to move in the preset directions (x direction and / or y direction), move to a plurality of preset positions respectively, and at each preset position, execute: controlling the illumination module 1 to emit uniform light, and sequentially performing optical imaging through the frosted bottom surface 212 of the optical vitreous body, the freeform lens to be measured, the objective lens 31, the focusing lens 32 and the imaging lens 33 to obtain the change curve of the clarity of the images of different positions of the frosted bottom surface 212 with the position z of the focusing lens 32.

[0097] It should be noted that for the target region on the freeform lens, during optical imaging, the focusing lens 32 moves continuously, so that the illumination module 1 emits uniform light and sequentially performs optical imaging through the frosted bottom surface 212 of the optical vitreous body, the freeform lens to be measured at the preset position, the objective lens 31, the focusing lens 32 and the imaging lens to obtain the change curve of the clarity of the image of the frosted bottom surface 212 with the position of the focusing lens 32, which will not be elaborated in this embodiment.

[0098] In one embodiment, before the step S40 of "controlling the multi-axis moving stage to drive the free-form surface spectacle lens to be measured to be translated to a plurality of preset positions" described above, it may further include:

[0099] Step S50, performing global mesh division on the free-form surface spectacle lens to be measured to obtain a plurality of lens mesh regions, so as to control the multi-axis moving stage to drive the free-form surface spectacle lens to be measured to be translated to the preset positions corresponding to the lens mesh regions respectively.

[0100] In this embodiment, global measurement mesh division can be performed on the free-form surface lens to be measured. The unit of each mesh is s(i)mm, and the central coordinates of the lens are set as A0(0,0). After the light beam passes through the lens center, the focusing lens 32 and the imaging lens 33, it is absolutely conjugate to a corresponding point on the sensor 41.

[0101] Furthermore, the multi-axis moving stage can be moved to translate s(i)mm in the positive x direction. At this time, the conjugate point coordinates on the free-form surface lens to be measured are A. The uniform unit light beam emitted passes through the position A of the lens, the focusing lens 32 and the imaging lens 33 and then converges on the sensor 41. The sensor 41 records the clearest image corresponding to the position of the lens, extracts the clarity change curve before and after inserting the free-form surface lens to be measured, and combines the refractive compensation algorithm of the above embodiment (i.e., the relationship between the above imaging clarity and the refractive compensation amount) to inversely calculate the refractive parameters corresponding to each lens mesh region.

[0102] Four translation misalignment measurements are performed in sequence, as Figure 10 shown. At this time, the corresponding conjugate points are A1(2s(i),0), A2(-2s(i),-2s(i)), A3(0,2s(i)), A4(0,-2s(i)) respectively. According to the above refractive compensation algorithm, refractive parameters such as the spherical power, cylindrical power and axis position information of the A1, A2, A3 and A4 regions can be obtained.

[0103] In this embodiment, by moving the free-form surface lens to be measured, the peripheral region of the free-form surface lens to be measured can be selected as the center point, the clarity change curve of this region is extracted, and the refractive parameters of the corresponding free-form surface lens to be measured are calculated. Single-point measurement of the free-form surface lens to be measured can be realized, which can be used to verify the accuracy of the simultaneous measurement of refractive parameters in multiple regions of the free-form surface lens to be measured in the above embodiment, and ensure the accurate measurement of the refractive parameters of the lens to be measured.

[0104] Furthermore, in this embodiment, the method for detecting the refractive power distribution of the free-form surface of the spectacle lens of the present invention may further include:

[0105] Step S60, determine the refractive scanning area of the free-form lens to be measured. The diopter of the optical long vitreous body matches the central diopter of the free-form lens to be measured, and the difference between the central diopter of the free-form lens to be measured and the diopter of the optical long vitreous body is less than the preset diopter deviation threshold.

[0106] In this embodiment, as Figure 11 shown, the diopter of the long vitreous body 21 needs to match the diopter of the center of the free-form lens to be measured, ensuring that the diopter deviation between the two does not exceed 0.25D (i.e., the preset diopter deviation threshold in this embodiment). This can minimize the scanning range, shorten the detection time, and improve the detection efficiency.

[0107] Specifically, for example, control the focusing lens 32 to continuously move, and after performing refractive adjustment, determine the clear imaging result of the frosted bottom surface 212 of the long vitreous body 21. After determining the clear imaging result, obtain the refractive compensation value corresponding to the distance that the focusing lens 32 continuously moves, which is the refractive scanning area. At this time, within this refractive scanning area, as Figure 11 shown, the diopter of the center of the free-form lens to be measured is adjusted to the initial state, that is, the diopter is 0D.

[0108] Through the above method, the refractive scanning area of the free-form lens to be measured can be determined, so that the uniform light emitted by the illumination module 1 is sequentially optically imaged through the frosted bottom surface 212 of the optical vitreous body, the refractive scanning area of the free-form lens to be measured, the objective lens 31, the focusing lens 32, and the imaging lens 33 to obtain the imaging change curve of the frosted bottom surface 212. Among them, within this refractive scanning area, the diopter deviation between the long vitreous body 21 and the center diopter of the free-form lens to be measured does not exceed 0.25D.

[0109] Therefore, in this embodiment, the free-form lens to be measured can also be driven by a multi-axis motion stage for optical imaging, without the need to extract the regional imaging of at least one target area, which can further improve the detection efficiency of the free-form lens. In addition, the present invention can perform optical imaging within the refractive scanning area, shorten the detection time, and improve the detection efficiency.

[0110] In addition, an embodiment of the present invention also proposes a computer-readable storage medium, on which a detection program for the refractive distribution of the free-form surface of the spectacle lens is stored. When the detection program for the refractive distribution of the free-form surface of the spectacle lens is executed by a processor, the steps of the detection method for the refractive distribution of the free-form surface of the spectacle lens described below are implemented.

[0111] For each embodiment of the detection device and computer-readable storage medium for the refractive distribution of the free-form surface of the spectacle lens of the present invention, reference can be made to each embodiment of the detection method for the refractive distribution of the free-form surface of the spectacle lens of the present invention, which will not be elaborated here.

[0112] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A method for detecting the refractive power distribution of a free-form surface of an ophthalmic lens, characterized in that, The detection method is based on the principle of optical imaging and is applied to a refractive detection system for spectacle lenses. The refractive detection system for spectacle lenses includes: an illumination module, a testing module, and a focusing and imaging module. The free-form surface lens to be tested is placed in the testing module, and the position of the free-form surface lens to be tested corresponds to the frosted bottom surface of the optical long strip vitreous body in the testing module; The detection method includes: Controlling the illumination module to emit uniform illumination light to illuminate the frosted bottom surface of the optical long strip vitreous body, using the focusing and imaging module to image the frosted bottom surface, and obtaining an image sequence of the frosted bottom surface by adjusting the position of the focusing lens in the focusing and imaging module; According to the image sequence of the frosted bottom surface, obtaining a curve of the clarity of images at different positions of the frosted bottom surface changing with the position of the focusing lens; According to the maximum value of the change curve, determining the refractive compensation differences at different positions of the frosted bottom surface, and combining the position correspondence between the free-form surface lens to be tested and the frosted bottom surface, obtaining the refractive information of different regions of the free-form surface lens to be tested. Specifically: For the change curve of the target region on the free-form surface lens to be tested, obtaining the maximum clarity values in different imaging directions; according to the maximum clarity values in multiple different imaging directions, obtaining a refractive compensation sequence corresponding to the maximum clarity values in different imaging directions; determining the maximum refractive compensation value and the minimum refractive compensation value of the refractive compensation sequence; according to the maximum refractive compensation value and the minimum refractive compensation value, determining the refractive information of the target region of the free-form surface lens to be tested, where the refractive information includes spherical power, cylindrical power, and axis position information. The spherical power is the minimum refractive compensation value, the cylindrical power is the difference between the maximum refractive compensation value and the minimum refractive compensation value, and the axis position information is the angle value of the change curve corresponding to the minimum refractive compensation value.

2. The detection method according to claim 1, characterized in that, The detection method for the refractive distribution of the free-form surface of spectacle lenses further includes: Determining the refractive scanning region of the free-form surface lens to be tested, where the refractive power of the optical long strip vitreous body matches the central refractive power of the free-form surface lens to be tested, and the difference between the central refractive power of the free-form surface lens to be tested and the refractive power of the optical long strip vitreous body is less than a preset refractive power deviation threshold.

3. The detection method according to claim 1, characterized in that The testing module further includes: a multi-axis moving stage, which is erected at the bottom of the free-form surface lens to be tested; The detection method further includes: Controlling the multi-axis moving stage to drive the free-form surface lens to be tested to be translated to a plurality of preset positions respectively, the illumination module emits uniform illumination light to illuminate the frosted bottom surface of the optical long strip vitreous body in the testing module, and using the focusing and imaging module to perform optical imaging on the frosted bottom surface.

4. The detection method according to claim 3, wherein Before the step of controlling the multi-axis moving stage to drive the free-form surface lens to be tested to be translated to a plurality of preset positions respectively, it further includes: Performing global grid division on the free-form surface lens to be tested to obtain a plurality of lens grid regions, so as to control the multi-axis moving stage to drive the free-form surface lens to be tested to be translated to the preset positions corresponding to the lens grid regions.

5. A terminal device, characterized in that, The terminal device includes a memory, a processor, and a detection program for the refractive power distribution of the free-form surface of spectacle lenses stored on the memory and executable on the processor. When the detection program for the refractive power distribution of the free-form surface of spectacle lenses is executed by the processor, the steps of the detection method for the refractive power distribution of the free-form surface of spectacle lenses according to any one of claims 1 to 4 are implemented.

6. A computer-readable storage medium, characterized in that, A detection program for the refractive power distribution of the free-form surface of spectacle lenses is stored on the computer-readable storage medium. When the detection program for the refractive power distribution of the free-form surface of spectacle lenses is executed by the processor, the steps of the detection method for the refractive power distribution of the free-form surface of spectacle lenses according to any one of claims 1 to 4 are implemented.

7. A computer program product, characterized in that, It includes a computer program stored in a computer-readable storage medium; when the processor of the electronic device reads the computer program from the computer-readable storage medium, the processor executes the computer program, causing the electronic device to execute the steps of any one of the methods according to claims 1 to 4.

Images