Evaluation device and method for curvature detection of orthokeratology lens

Abstract

The invention discloses an evaluation device and method for curvature detection of an orthokeratology lens, and the device comprises a light source module which is used for providing imaging light sources required by different scenes for curvature detection; the orthokeratology objective table module is used for installing and fixing a sample to be tested and adjusting the position; the image acquisition module is used for acquiring image information of the sample to be detected and transmitting an image to the computer system module; and the computer system module is used for receiving the image information transmitted by the image acquisition module, processing and analyzing the image information and finally outputting a detection result report. Through paraxial / transmission light source imaging, the imaging problem of the inner and outer contours of the orthokeratology lens is solved, and the clear imaging effect of the inner and outer contours of the orthokeratology lens is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of orthokeratology lens detection, and in particular, relates to an evaluation device and method for orthokeratology lens curvature detection. Background Art

[0002] Orthokeratology lenses refer to a specially designed hard gas-permeable contact lens, which is a type of corneal contact lens. Wearing orthokeratology lenses is a non-surgical corrective treatment method that uses mechanical compression or massage to increase the central radius of curvature of the cornea, reshape the corneal surface morphology, and reduce the refractive power of the corneal optical zone, thereby achieving the effect of correcting low to moderate myopia and keratoconus. After wearing orthokeratology lenses for a long time, in order to understand whether the orthokeratology lenses are deformed, they need to be tested regularly.

[0003] Among the existing detection methods, magnified projection observation (CN217878967U orthokeratology lens detector) and material coloring processing analysis (CN111931737A A corneal lens abnormality judgment method and system) are mostly used. The former requires users to have certain detection and judgment experience to ensure the accuracy of the detection, which has a certain degree of subjectivity. The latter has a complicated detection process and introduces protein colorants. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to address the deficiencies in the prior art and to provide an evaluation device and method for detecting the curvature of orthokeratology lenses. The device and method can detect the curvature of the orthokeratology lenses quickly and compare it with the nominal curvature of the product, thereby achieving non-contact, non-subjective, and non-colorant optical detection without the introduction of colorants, based on the deformation of the orthokeratology lenses, which causes the curvature of the lenses to change.

[0005] Technical solution: The present invention provides an evaluation device for detecting the curvature of orthokeratology lenses, comprising: Light source module, used to provide imaging light source for different scene requirements for curvature detection; Orthokeratology lens stage module, used to install and fix the sample to be tested and adjust the position; An image acquisition module is used to acquire image information of the sample to be tested and transmit the image to the computer system module; The computer system module receives the image information transmitted by the image acquisition module, processes and analyzes the image information, and finally outputs a detection result report.

[0006] In some embodiments, the light source module includes a transmissive light source, a paraxial light source, and a power controller, and the transmissive light source and the paraxial light source are respectively connected to the power controller.

[0007] In some embodiments, the transmitted light source is placed at the orthokeratology lens stage module; and the paraxial light source is placed at the image acquisition module.

[0008] In some embodiments, the orthokeratology lens stage module includes a orthokeratology lens stage and a sample to be tested mounted on the orthokeratology lens stage, and the orthokeratology lens stage adopts one of a single-axis slide, a two-axis slide, a three-axis slide, a four-axis slide, a five-axis slide or a six-axis slide.

[0009] In some embodiments, the image acquisition module includes a camera, a macro-telecentric lens, and a multi-axis adjustment platform, the camera is mounted on the multi-axis adjustment platform, and the macro-telecentric lens is mounted on the camera.

[0010] In some embodiments, the multi-axis adjustment platform adopts one of a single-axis slide, a two-axis slide, a three-axis slide, a four-axis slide, a five-axis slide, or a six-axis slide.

[0011] In some embodiments, the camera is a CMOS or CCD area array camera.

[0012] In some embodiments, the computer system module includes a computer and a data analysis program to provide imaging information acquisition, processing and analysis feedback for orthokeratology lenses.

[0013] On the other hand, the present invention also discloses a method for detecting the curvature of orthokeratology lenses, comprising the following steps: (1) Turn on the power: Turn on the corresponding power of the light source controller and computer respectively; (2) Placing the sample to be tested: Place the orthokeratology lens sample to be tested at the center of the orthokeratology lens stage; (3) Open the data analysis and processing program: (a) Open the camera image acquisition; (b) Retrieve the curvature corresponding to the orthokeratology lens model to be tested; (4) Camera adjustment: adjust the orthokeratology lens to be tested to the imaging center and click on the software to capture the image; (5) Curvature test: Select three points on the orthokeratology lens surface to be tested in the image, click the analysis function, and output the measured curvature and judgment results; (6) Switching light sources and testing at different viewing angles: Test the curvature of the inner and outer contours of the orthokeratology lens under different light sources, adjust the rotation function of the orthokeratology lens stage, change the angle to 0 / 45 / 90°, and repeat step (5); (7) Output report: Determine the degree of deformation of the orthokeratology lens to be tested and output a report; (8) Completion: Remove the orthokeratology lens sample, close the software, and turn off the power.

[0014] In some embodiments, the curvature testing process described in step (5) specifically includes: Step 1: Select three points on the contour curve, connect them in pairs, and draw vertical lines; Step 2: Construct the curvature circle by taking the intersection of the perpendicular bisectors of any two points of the circumscribed circle as the center of the curvature circle, and mark the number of pixels N1 corresponding to the center of curvature and the radius of curvature and the number of pixels N2 on the horizontal axis; Step 3: Calculate the radius of curvature R = N1 / N2*X, where X is the image pixel and the actual object scale; Step 4: Compare with the curvature R0 of the corresponding model in the orthokeratology lens curvature database, calculate the deviation η=abs[(R-R0) / R0]*100%, and output the judgment result: η=[0,3%], no deformation; η=[3%,10%], slight deformation; η=[10%,100%], severe deformation.

[0015] Beneficial effects: The beneficial effects of the present invention are as follows: (1) The device of the present invention solves the problem of imaging the inner and outer contours of orthokeratology lenses by combining paraxial / transmitted light source imaging, and achieves clear imaging of the inner and outer contours of orthokeratology lenses; (2) The device of the present invention solves the problem that the symmetry of orthokeratology lenses needs to be freely switched to test the viewing angle through the rotation adjustment function of the orthokeratology lens stage module, thereby realizing the curvature detection of orthokeratology lenses at different viewing angles; (3) The device of the present invention solves the problem of matching the size of orthokeratology lenses with the size of the camera target surface through a macro telecentric lens, and realizes the testing of orthokeratology lenses with different size requirements; (4) The detection method of the present invention solves the problems of curvature test data calculation and deformation judgment through curvature fitting algorithm and orthokeratology lens matching judgment, thereby realizing the detection of orthokeratology lenses without human subjective judgment and without the introduction of colorants. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an evaluation device according to an embodiment of the present invention; Figure 2 A schematic diagram of an evaluation method flow chart of an embodiment of the present invention; Figure 3 This is a schematic diagram of the three-point fitting curvature test principle of the present invention; Figure 4 An outer contour image under a transmitted light source according to an embodiment of the present invention; Figure 5 An inner contour image under a paraxial light source according to an embodiment of the present invention; Figure 6This is an image 1 of the inner and outer contour fitting effect of an embodiment of the present invention; Figure 7 This is the second image of the inner and outer contour fitting effect of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "inside" and "outside" are the directions or positional relationships shown, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings. Example 1

[0021] An evaluation device for detecting the curvature of orthokeratology lenses, comprising: Light source module, used to provide imaging light source for different scene requirements for curvature detection; Orthokeratology lens stage module, used to install and fix the sample to be tested and adjust the position; An image acquisition module is used to acquire image information of the sample to be tested and transmit the image to the computer system module; The computer system module receives the image information transmitted by the image acquisition module, processes and analyzes the image information, and finally outputs a detection result report.

[0022] The detection principle of the present invention is based on the deformation of the orthokeratology lens, which causes the curvature of the lens to change. Therefore, a non-contact, non-subjective human judgment, and non-colorant optical detection method can be used to quickly detect the curvature of the orthokeratology lens and compare it with the nominal curvature of the product.

[0023] The image information of the sample orthokeratology lens is collected through the image acquisition module, and the image information is transmitted to the computer system module for processing and analysis, and finally the test result report is output. Example 2

[0024] like Figure 1 As shown, an evaluation device for detecting the curvature of orthokeratology lenses comprises: Light source module, used to provide imaging light source for different scene requirements for curvature detection; Orthokeratology lens stage module, used to install and fix the sample to be tested and adjust the position; An image acquisition module is used to acquire image information of the sample to be tested and transmit the image to the computer system module; A computer system module receives the image information transmitted by the image acquisition module, processes and analyzes the image information, and finally outputs a detection result report; and a bottom plate 10 .

[0025] In this embodiment, Figure 1 As shown, the light source module includes a transmitted light source 2, a paraxial light source 3 and a power controller 1. The transmitted light source 2 and the paraxial light source 3 are respectively connected to the power controller 1, and the transmitted light source 2 and the paraxial light source 3 are turned on or off by controlling the power controller 1.

[0026] In this embodiment, Figure 1 As shown, the transmission light source 2 is placed at the orthokeratology lens stage module; the paraxial light source 3 is placed at the image acquisition module. By combining the transmission light source 2 and the paraxial light source 3, imaging light sources for different scene requirements are provided for the detection of the inner and outer contour curvature of the orthokeratology lens, and both light sources are white light LED light sources.

[0027] In this embodiment, Figure 1 As shown, the orthokeratology lens stage module includes a orthokeratology lens stage 5 and a sample 4 to be tested mounted on the orthokeratology lens stage 5. The orthokeratology lens stage 5 adopts a multi-axis structure, including but not limited to a single-axis slide, a two-axis slide, a three-axis slide (X / Y / Z axis), a four-axis slide, a five-axis slide and a six-axis slide (X / Y / Z axis / rotation / ab tilt table) (the X / Y / Z axis / rotation / a / b tilt table here refers to adjustment in six directions), providing fixation and position, height, angle and other adjustments for the orthokeratology lens sample.

[0028] In this embodiment, Figure 1 As shown, the image acquisition module includes a camera 7, a macro telecentric lens 6 (1:1; 1:2, etc.) and a multi-axis adjustment platform 8, the camera 7 is mounted on the multi-axis adjustment platform 8, and the macro telecentric lens 6 is mounted on the camera 7.

[0029] Furthermore, the multi-axis adjustment table 8 adopts a multi-axis structure, including but not limited to a single-axis slide, a two-axis slide, a three-axis slide (X / Y / Z axis), a four-axis slide, a five-axis slide and a six-axis slide (X / Y / Z axis / rotation / ab tilt table) (the X / Y / Z axis / rotation / a / b tilt table here refers to adjustment in six directions), providing fixation and position, height, angle and other adjustments for the camera 7.

[0030] Furthermore, the camera 7 is a CMOS or CCD area array camera.

[0031] In this embodiment, Figure 1 As shown, the computer system module includes a computer 9 and a data analysis and processing program installed in the computer 9, which provides imaging information acquisition, processing and analysis feedback for the orthokeratology lens. Example 3

[0032] The present invention also discloses a method for detecting the curvature of orthokeratology lenses, such as Figure 2 As shown, the specific steps include: (1) Turn on the power: Turn on the corresponding power of the light source controller and computer respectively; (2) Placing the sample to be tested: Place the orthokeratology lens sample to be tested at the center of the orthokeratology lens stage; (3) Open the data analysis and processing program: (a) Open the camera image acquisition; (b) Retrieve the curvature corresponding to the orthokeratology lens model to be tested; (4) Camera adjustment: Adjust the orthokeratology lens to be tested to the imaging center, click the software image acquisition, and the specific images of the outer and inner contours collected are as follows: Figure 4 and Figure 5 As shown; (5) Curvature test: Select three points on the orthokeratology lens surface to be tested in the image, click the analysis function, and output the measured curvature and judgment results; (6) Switching light sources and testing at different viewing angles: Test the curvature of the inner and outer contours of the orthokeratology lens under different light sources, adjust the rotation function of the orthokeratology lens stage, change the angle to 0 / 45 / 90°, and repeat step (5); (7) Output report: Determine the degree of deformation of the orthokeratology lens to be tested and output a report; (8) Completion: Remove the orthokeratology lens sample, close the software, and turn off the power.

[0033] In this embodiment, combined with the attached Figure 3 , Figure 6 and Figure 7 As shown, the curvature testing process described in step (5) specifically includes: Step 1: Select three points on the contour curve, connect them in pairs, and draw vertical lines; Step 2: Construct the curvature circle by taking the intersection of the perpendicular bisectors of any two points of the circumscribed circle as the center of the curvature circle, and mark the number of pixels N1 corresponding to the center of curvature and the radius of curvature and the number of pixels N2 on the horizontal axis; Step 3: Calculate the radius of curvature R = N1 / N2*X, where X is the image pixel and the actual object scale; Step 4: Compare with the curvature R0 of the corresponding model in the orthokeratology lens curvature database, calculate the deviation η=abs[(R-R0) / R0]*100%, and output the judgment result: η=[0,3%], no deformation; η=[3%,10%], slight deformation; η=[10%,100%], severe deformation.

[0034] The following table is the output data table of the orthokeratology lens example: name R / mm R0 / mm Deviation value η / % No deformation Slight deformation Severe deformation Outer contour curvature radius R / 0° 7.81 8 2.375% √ Inner contour curvature radius R / 0° 7.77 8 2.875% √ Outer contour curvature radius R / 0° 7.79 8 2.625% √ Inner contour curvature radius R / 0° 7.82 8 2.225% √ Outer contour curvature radius R / 0° 7.81 8 2.375% √ Inner contour curvature radius R / 0° 7.79 8 2.625% √ The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An evaluation device for detecting the curvature of orthokeratology lenses, characterized in that: include: Light source module, used to provide imaging light source for different scene requirements for curvature detection; Orthokeratology lens stage module, used to install and fix the sample to be tested and adjust the position; An image acquisition module is used to acquire image information of the sample to be tested and transmit the image to the computer system module; The computer system module receives the image information transmitted by the image acquisition module, processes and analyzes the image information, and finally outputs a detection result report.

2. The evaluation device for detecting orthokeratology lens curvature according to claim 1, characterized in that: The light source module comprises a transmission light source, a paraxial light source and a power controller, and the transmission light source and the paraxial light source are connected to the power controller respectively.

3. The evaluation device for detecting orthokeratology lens curvature according to claim 2, characterized in that: The transmitted light source is placed at the orthokeratology lens stage module; the paraxial light source is placed at the image acquisition module.

4. The evaluation device for detecting orthokeratology lens curvature according to claim 1, characterized in that: The orthokeratology lens stage module includes a orthokeratology lens stage and a sample to be tested mounted on the orthokeratology lens stage. The orthokeratology lens stage adopts one of a single-axis slide, a two-axis slide, a three-axis slide, a four-axis slide, a five-axis slide or a six-axis slide.

5. The evaluation device for detecting orthokeratology lens curvature according to claim 1, characterized in that: The image acquisition module comprises a camera, a macro-telecentric lens and a multi-axis adjustment platform, the camera is mounted on the multi-axis adjustment platform, and the macro-telecentric lens is mounted on the camera.

6. The evaluation device for detecting orthokeratology lens curvature according to claim 5, characterized in that: The multi-axis adjustment platform adopts one of a single-axis slide, a two-axis slide, a three-axis slide, a four-axis slide, a five-axis slide or a six-axis slide.

7. The evaluation device for detecting orthokeratology lens curvature according to claim 5, characterized in that: The camera is a CMOS or CCD area array camera.

8. The evaluation device for detecting orthokeratology lens curvature according to claim 1, characterized in that: The computer system module includes a computer and a data analysis and processing program, which provides imaging information collection, processing and analysis feedback for orthokeratology lenses.

9. A method for detecting the curvature of orthokeratology lenses, characterized in that: The steps include: (1) Turn on the power: Turn on the corresponding power of the light source controller and computer respectively; (2) Placing the sample to be tested: Place the orthokeratology lens sample to be tested at the center of the orthokeratology lens stage; (3) Open the data analysis and processing program: (a) Open the camera image acquisition; (b) Retrieve the curvature corresponding to the orthokeratology lens model to be tested; (4) Camera adjustment: adjust the orthokeratology lens to be tested to the imaging center and click on the software to capture the image; (5) Curvature test: Select three points on the orthokeratology lens surface to be tested in the image, click the analysis function, and output the measured curvature and judgment results; (6) Switching light sources and testing at different viewing angles: Test the curvature of the inner and outer contours of the orthokeratology lens under different light sources, adjust the rotation function of the orthokeratology lens stage, change the angle to 0 / 45 / 90°, and repeat step (5); (7) Output report: Determine the degree of deformation of the orthokeratology lens to be tested and output a report; (8) Completion: Remove the orthokeratology lens sample, close the software, and turn off the power.

10. A method for detecting the curvature of orthokeratology lenses according to claim 9, characterized in that: The curvature testing process described in step (5) specifically includes: Step 1: Select three points on the contour curve, connect them in pairs, and draw vertical lines; Step 2: Construct the curvature circle by taking the intersection of the perpendicular bisectors of any two points of the circumscribed circle as the center of the curvature circle, and mark the number of pixels N1 corresponding to the center of curvature and the radius of curvature and the number of pixels N2 on the horizontal axis; Step 3: Calculate the radius of curvature R = N1 / N2*X, where X is the image pixel and the actual object scale; Step 4: Compare with the curvature R0 of the corresponding model in the orthokeratology lens curvature database, calculate the deviation η=abs[(R-R0) / R0]*100%, and output the judgment result: η=[0,3%], no deformation; η=[3%,10%], slight deformation; η=[10%,100%], severe deformation.

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