A center positioning system and method for femtosecond laser ophthalmic corneal refractive surgery

Abstract

The application provides a center positioning system for femtosecond laser ophthalmic corneal refractive surgery, which comprises an iris recognition component, a central processing component and a real-time display component, the iris recognition component is used for converting a real-time image of a patient into a digital image; the central processing component is electrically connected with the iris recognition component, and the central processing component is used for converting the digital image into an iris simulation image with a size equal to that of a pre-recorded patient examination iris image; the real-time display component is electrically connected with the central processing component, is used for receiving the iris simulation image transmitted by the central processing component, and presents the iris information transmitted by the central processing component in real time. Meanwhile, a center positioning method is also provided, which takes the corneal vertex as the center, calculates the self-rotation angle of a treated eye of a patient by comparing the image angle difference between the iris simulation image and the pre-recorded real-time image, improves the positioning accuracy, significantly reduces the residual myopia and astigmatism, and improves the safety of the ophthalmic femtosecond laser surgery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ophthalmic keratometric technology, in particular to a center positioning system and method for femtosecond laser ophthalmic keratometric surgery. BACKGROUND

[0002] In traditional femtosecond laser ophthalmic keratometric surgery, the center is generally positioned by having the patient fix their gaze on a fixation light or using the shape of a water mark on the cornea in contact with a negative pressure ring.

[0003] This alignment method has too much error under the micron-level precision of ophthalmic keratometric surgery, which causes some patients to still have residual myopia or introduces high-order aberrations after surgery; at the same time, when the human body changes from a standing position to a lying position, the eye will spin at a certain angle along the optical axis, so the recorded astigmatism axis position during examination will be different during surgical treatment, resulting in undercorrection of astigmatism. SUMMARY

[0004] The present application provides a center positioning system and method for femtosecond laser ophthalmic keratometric surgery to solve the technical problems of poor alignment accuracy, reduced residual myopia and astigmatism, and poor surgical safety in traditional methods.

[0005] To solve the above problems, the first object of the present application is to provide a center positioning system for femtosecond laser ophthalmic keratometric surgery, comprising:

[0006] An iris recognition component for converting the real-time image of the patient into a digital image;

[0007] A central processing component electrically connected to the iris recognition component, the central processing component being configured to convert the digital image into an iris simulation image equal in size to a pre-recorded patient examination iris image;

[0008] A real-time display component electrically connected to the central processing component, the real-time display component being configured to receive the iris simulation image transmitted by the central processing component and to present the iris information transmitted by the central processing component in real time.

[0009] Preferably, the iris recognition component includes a single-lens reflex mirror, a light shadow collector, and an HDMI-USB adapter, one end of the HDMI-USB adapter being electrically connected to the light shadow collector and the other end being electrically connected to the central processing component.

[0010] Preferably, the single-lens reflex mirror is made of glass and has a circular or square shape.

[0011] Preferably, the surface of the single-lens reflex mirror is coated to have a reflection wavelength range of 390-780 nm.

[0012] Preferably, the light shadow collector comprises a filter and a high frame rate camera, the size of the filter is the same as the lens diameter of the high frame rate camera.

[0013] Preferably, the focal length of the high frame rate camera is 60-144fps, the pixel is 1-8 million, and the resolution is 1080p-8k.

[0014] Preferably, the central processing component comprises:

[0015] The acquisition and processing module is used for acquiring the iris image information of the patient and generating the iris simulation image of the patient.

[0016] The extraction module is used for extracting the texture of the iris simulation image of the patient.

[0017] The superposition module is used for superimposing the abstracted iris image to form the iris simulation image.

[0018] The transformation module is used for transforming the real-time image of the treated eye of the patient into an image with the same size as the iris simulation image.

[0019] The calculation module is used for calculating the spin angle of the treated eye of the patient.

[0020] Preferably, the iris image information comprises the size, position, texture and corneal vertex of the iris.

[0021] The second object of the application is to provide a center positioning method for femtosecond laser ophthalmic corneal refractive surgery, which comprises the following steps:

[0022] S1: Before the corneal refractive surgery, the iris shooting image of the patient during the examination is pre-recorded into the central processing component of the treatment device;

[0023] S2: The central processing component acquires the iris image information of the patient and generates the iris simulation image of the patient.

[0024] S3: The treatment bed is moved to make the real-time image of the treated eye of the patient displayed in the real-time display component coincide with the corneal vertex of the iris simulation image, so as to ensure that the center of the eye axis of the patient coincides with the machining center of the femtosecond laser, thereby completing the center positioning of the corneal surgery.

[0025] S4: Taking the corneal vertex as the center, the central processing component calculates the spin angle of the eyeball of the patient by comparing the included angle between the real-time image and the iris simulation image.

[0026] The third object of the application is to provide a computer readable storage medium, which stores a computer program, when the computer program is executed by a processor, the center positioning method for femtosecond laser ophthalmic corneal refractive surgery is realized.

[0027] The present application has significant advantages and beneficial effects compared with the prior art, which are embodied in the following aspects:

[0028] In order to improve the positioning accuracy, significantly reduce the degree of myopia and astigmatism, and improve the safety of femtosecond laser ophthalmic surgery, the present application implants an iris recognition comparison method into a traditional device, so that the system comprises an iris recognition component, a central processing component, and a real-time display component. The iris recognition component is used to abstractly collect and synthesize the biological information of the patient's eye, especially the size, position, texture, corneal vertex, and other information of the iris, to generate an iris simulation image, so as to perform center positioning and automatic measurement of the spin angle of laser processing in surgery. The central processing component can convert the real-time image processing of the patient during examination into an iris simulation image, and perform equal-size transformation on the real-time image input by the iris recognition component, so that the size of the real-time image is the same as that of the iris simulation image, and the spin angle of the patient's treated eye is calculated by comparing the angle difference of the two images with the corneal vertex as the center. The image can be displayed in the real-time display component to position the center and axis of the cornea, which is more accurate than the traditional positioning method. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a structural schematic diagram of a femtosecond laser ophthalmic corneal refractive surgery center positioning system in an embodiment of the present application;

[0030] Figure 2 FIG. 2 is a deflection schematic diagram of an iris recognition angle in an embodiment of the present application;

[0031] Figure 3 FIG. 3 is a flowchart of a positioning method of a femtosecond laser ophthalmic corneal refractive surgery center in an embodiment of the present application;

[0032] Figure 4 FIG. 4 is a structural schematic diagram of a central processing component in an embodiment of the present application.

[0033] BRIEF DESCRIPTION OF DRAWINGS:

[0034] 100-iris recognition component; 110-single lens reflex mirror; 120-light shadow collector;

[0035] 200-central processing component; 210-collection and processing module; 220-extraction module; 230-stacking module; 240-transformation module; 250-computation module;

[0036] 300-real-time display component. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "provided with" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the conventional femtosecond laser ophthalmic corneal refractive surgery treatment process, the center positioning mode is to fix the patient's gaze on the fixation lamp, and the center of the patient's eyeball is placed near the center of the laser treatment window; when the laser treatment window is connected with the cornea through the negative pressure ring, a watermark will be formed on the surface of the negative pressure ring contact lens, if the center of the watermark is the same as the laser processing center, it is considered that the center is aligned; if the center of the watermark is offset from the laser processing center, the treatment bed is moved back and forth to adjust the corneal vertex to the laser processing center.

[0040] The above-mentioned mode has certain effect, but the error is too large compared with the micron-level precision of femtosecond laser surgery. First, the corneal center positioning is not accurate, which will cause the laser processing to be offset, resulting in undercorrection or introducing high-order aberrations; secondly, since the patient needs to lie on the treatment bed during treatment, the eye spin caused by the change from standing position during examination to lying position during treatment will cause the change of the astigmatism axis recorded during examination, resulting in undercorrection of astigmatism.

[0041] To solve the above technical problems, please refer to Figures 1-4 The embodiment of the present application provides a center positioning system for femtosecond laser ophthalmic corneal refractive surgery, which comprises an iris recognition component 100, a central processing component 200 and a real-time display component 300, the central processing component 200 is electrically connected with the iris recognition component 100 and the real-time display component 300 respectively, wherein:

[0042] The iris recognition component 100 is used to convert the real-time image of the patient into a digital image;

[0043] The central processing unit 200 is used to process the real-time image during the patient examination into an iris simulation image, and transform the real-time image into an iris simulation image of the same size by an equal multiple. The central processing unit 200 calculates the spin angle of the patient's treated eye by comparing the image angle difference between the iris simulation image and the real-time image with the corneal vertex as the center.

[0044] The real-time display component 300 is used to display the iris information transmitted from the central processing component 200 in real time.

[0045] It needs to be explained in detail here that, Figure 1 In the diagram, the dashed line represents the direction of laser transmission, the solid line represents the direction of visible light transmission, and the dotted line represents the direction of image signal transmission.

[0046] Specifically, please refer to Figure 1 As shown, the iris recognition component 100 includes a single-lens reflex mirror 110, a light and shadow collector 120, and an HDMI-USB adapter cable. One end of the HDMI-USB adapter cable is electrically connected to the light and shadow collector 120, and the other end is electrically connected to the central processing component 200.

[0047] Therefore, when the patient is lying on the treatment bed receiving femtosecond corneal refractive surgery, the real-time image obtained by the light and shadow acquisition device 120 is transmitted to the central processing unit 200, and the HDMI-USB adapter cable is used to transmit the image acquired in real time by the high-frequency camera to the central processing unit 200.

[0048] Therefore, by adding a single-lens reflex mirror 110 to the optical path of the treatment device, the real-time visible light image of the patient's eyeball and the laser window is reflected to the light and shadow acquisition device 120. The light and shadow acquisition device 120 converts the real-time image into a digital image and transmits it to the central processing unit 200. The central processing unit 200 converts the digital image into an iris simulation image of the same size as the pre-recorded iris image of the patient and transmits it to the real-time display unit 300.

[0049] The surgeon manipulates the treatment bed to align the corneal vertex in the patient's real-time image with the corneal vertex in the pre-recorded image processed by the central processing unit 200, thus achieving center positioning. The rotation angle between the two images at this point is the patient's supine spin angle. By inputting this angle into the patient's treatment parameters, precise refractive surgery can be achieved.

[0050] Specifically, in the embodiments of the present invention, the SLR mirror 110 is made of glass and has a circular or square shape.

[0051] Therefore, the size of the single-lens reflex mirror 110 does not exceed the maximum radial dimension of the laser transmission path. Of course, the shape of the single-lens reflex mirror 110 can also be set to other shapes, such as rhombus, polygon, etc. This embodiment does not impose any restrictions on the shape of the single-lens reflex mirror 110.

[0052] Specifically, in the embodiments of the present application, the surface of the single mirror 110 is coated to make the reflection wavelength range of the single mirror 110 390-780nm.

[0053] Therefore, by coating the surface of the single mirror 110, the reflection wavelength of the single mirror 110 can meet the use requirements, so that the single mirror 110 can reflect visible light and transmit infrared or ultraviolet light, reflect the real-time state of the patient's eyeball under the laser treatment window into the light shadow collector 120 without changing the treatment laser transmission path, and reduce the visible light outside the light shadow collector 120. 120, to reduce its interference and damage to the light shadow collector 120.

[0054] Specifically, in the embodiments of the present application, the light shadow collector 120 includes a filter and a high-frame-rate camera, and the size of the filter is the same as the lens diameter of the high-frame-rate camera.

[0055] Because the size of the filter is the same as the lens diameter of the high-frame-rate camera, it can be used to further filter the non-visible light in the transmitted light, and reduce the interference and damage of the non-visible light on the camera in the system light path.

[0056] Specifically, in the embodiments of the present application, the focal length of the high-frame-rate camera is 60-144fps, the pixel is 1-8 million, and the resolution is 1080p-8k.

[0057] Therefore, by setting the high-frame-rate camera, the reflected image of the laser window can be collected and transmitted in real time.

[0058] Specifically, please refer to Figure 4 As shown in the figure, in the embodiments of the present application, the central processing component 200 includes an acquisition and processing module 210, an extraction module 220, a superposition module 230, a transformation module 240 and a calculation module 250, wherein:

[0059] The acquisition and processing module 210 is used to acquire the iris image information of the patient and generate a patient iris simulation image;

[0060] It should be emphasized here that before the corneal refractive surgery, the iris image taken during the patient's examination needs to be pre-recorded into the central processing component 200 of the treatment device.

[0061] Therefore, the acquisition and processing module 210 in the central processing component 200 acquires and processes the information such as the size, position, texture, corneal vertex of the patient's iris, and generates a patient iris simulation image, which is used as the standing eyeball reference information of the patient's iris.

[0062] Please refer to Figure 2As shown, in specific operations, the boundary between the iris and the pupil is taken as the inner circle, the boundary between the iris and the sclera as the outer circle, the boundary between the iris and the upper eyelid as curve A, and the boundary between the iris and the lower eyelid as curve B. A circular light spot is set at the position of the corneal apex to mark its relative position.

[0063] The extraction module 220 is used to extract the texture of the simulated iris image of the patient;

[0064] The overlay module 230 is used to overlay the abstracted iris image to form a simulated iris image;

[0065] The overlay module 240 in the central processing unit 200 is used to overlay the abstracted iris image to form an iris simulation image, and the position of the corneal vertex in the iris simulation image is the same as the center position of the laser processing.

[0066] The transformation module 240 is used to transform the real-time image of the patient's treated eye into an image of the same size as the simulated iris image.

[0067] The purpose of setting up the transformation module 240 is that, since the size of the processed iris simulation image is fixed, but the cornea and iris sizes of different patients are different, it is also necessary to perform a proportional size transformation on the real-time image of the patient's treated eye in the central processing component 200 so that its size is the same as that of the iris simulation image, which makes it easier to calculate the spin angle more accurately.

[0068] The calculation module 250 is used to calculate the spin angle of the patient's treated eye.

[0069] Thus, the central processing unit 200 can process the iris image during the patient's examination and convert it into an iris simulation image. It can also transform the real-time image input by the iris recognition unit 100 into an equal-sized image so that it is the same size as the iris simulation image. With the corneal vertex as the center, it calculates the spin angle of the patient's treated eye by comparing the image angle difference between the two.

[0070] Specifically, in embodiments of the present invention, the iris image information includes iris size, position, texture, and corneal apex.

[0071] Please see Figure 3 As shown in the figure, this embodiment of the invention also provides a method for center positioning in femtosecond laser corneal refractive surgery, the method comprising the following steps:

[0072] S1: Before corneal refractive surgery, the iris image taken during the patient's examination is pre-recorded into the central processing unit 200 of the treatment device;

[0073] S2: The central processing unit 200 acquires the patient's iris image information and generates a simulated image of the patient's iris;

[0074] S3: moving the treatment bed to make the corneal vertex of the real-time image of the patient's treated eye displayed in the real-time display component 300 coincide with the corneal vertex of the iris simulation image, to ensure that the center of the patient's eye axis coincides with the machining center of the femtosecond laser, to complete the center positioning of the corneal surgery;

[0075] S4: taking the corneal vertex as the center, the central processing component 200 calculates the spin angle of the patient's eyeball by comparing the included angle of the real-time image and the iris simulation image.

[0076] Referring to Figure 2 , the dashed line is the pre-recorded patient iris simulation image, and the solid line is the patient eye real-time image scaled by the central processing component 200. After the surgeon aligns the corneal vertex of the patient real-time image with the corneal vertex of the pre-recorded image, the difference in the rotation angle of the two is the patient's supine spin angle.

[0077] Specifically, in the embodiment of the present application, the iris photograph taken during the patient's examination is pre-recorded into the central processing component 200 of the treatment device before the corneal refractive surgery.

[0078] Referring to Figure 2 , the data processing software in the central processing component 200 collects and processes information such as the size, position, texture, and corneal vertex of the patient's iris. That is, taking the boundary of the iris and the pupil as the inner circle, the boundary of the iris and the sclera as the outer circle, the boundary of the iris and the upper eyelid as the A curve, and the boundary of the iris and the lower eyelid as the B curve, a circular light point is set at the position of the corneal vertex to mark its relative position, and the texture of the iris is extracted and simulated.

[0079] The data processing software in the central processing component 200 superimposes these abstracted images to form an iris simulation image, which is used as the patient's iris standing eye reference information and displayed in the real-time display component 300.

[0080] The patient lies on the treatment bed with the treated eye near the center position under the laser machining window. At this time, the image of the treated eye is reflected to the light shadow collector 120 through the single-lens reflex mirror 110 in the iris recognition component 100, and the light shadow collector 120 transmits the obtained real-time image to the central processing component 200. The central processing component 200 processes the profile size of the incoming image in a proportional manner to make it the same size as the iris simulation image, and displays it in the real-time display component 300.

[0081] The surgeon moves the treatment bed to make the corneal vertex of the real-time image of the patient's treated eye displayed in the real-time display component 300 coincide with the corneal vertex of the iris simulation image, to complete the center positioning.

[0082] At this time, the central processing component 200 can calculate the spin angle of the patient's eyeball by comparing the included angle of the two images with the corneal vertex as the center.

[0083] The angle is filled into the refractive surgery parameter setting of the treated eye of the patient, the surgery parameter is corrected, the refractive surgery is performed through the corrected angle, and the actual treatment parameter of the patient is consistent with the parameter when the patient is examined.

[0084] Therefore, the system can perform the abstract collection and synthesis of the biological information of the eye, especially the size, position, texture, corneal vertex and other information of the iris, by adding the hardware and software related to the iris recognition in the optical path of the femtosecond laser corneal refractive device, and generate the simulation image to perform the center positioning and automatic measurement of the spin angle of the laser processing in the surgery.

[0085] The embodiment of the present application also provides a computer readable storage medium, and the storage medium stores a computer program, and when the computer program is executed by a processor, the center positioning method for the femtosecond laser ophthalmic corneal refractive surgery is realized.

[0086] Although the present application discloses the above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A center positioning system for femtosecond laser ophthalmic corneal refractive surgery, characterized in that, The application relates to a center positioning method for corneal refractive surgery. The application comprises: an iris recognition component (100) for converting a real-time image of a patient into a digital image; the iris recognition component (100) comprises a single-lens reflex mirror (110), a light shadow collector (120) and an HDMI-USB adapter, one end of the HDMI-USB adapter is electrically connected with the light shadow collector (120), and the other end is electrically connected with a central processing component (200); the central processing component (200) is electrically connected with the iris recognition component (100), and the central processing component (200) is used for converting the digital image into an iris simulation image with a size equal to that of a pre-recorded iris image of a patient; the central processing component (200) comprises: a collection and processing module (210) for collecting iris image information of a patient and generating an iris simulation image of the patient, wherein the iris image information comprises iris size, position, texture and corneal vertex; an extraction module (220) for extracting the texture of the iris simulation image of the patient; a superposition module (230) for superimposing the abstracted iris image to form the iris simulation image; a conversion module (240) for converting a real-time image of a treated eye of the patient into an image with a size equal to that of the iris simulation image; a calculation module (250) for calculating the spin angle of the treated eye of the patient; 2. The femtosecond laser ophthalmic corneal refractive surgery centering system according to claim 1, characterized in that: a real-time display component (300) electrically connected with the central processing component (200), the real-time display component (300) is used for receiving the iris simulation image transmitted by the central processing component (200) and presenting the iris information transmitted by the central processing component (200) in real time.

3. The femtosecond laser ophthalmic corneal refractive surgery centering system of claim 2, wherein: The single-lens reflex mirror (110) is made of glass and has a circular or square shape.

4. The femtosecond laser ophthalmic corneal refractive surgery center positioning system according to claim 1, characterized in that: The surface of the single-lens reflex mirror (110) is coated to make the reflection wavelength range of the single-lens reflex mirror (110) 390-780 nm.

5. The femtosecond laser ophthalmic corneal refractive surgery centering system according to claim 4, characterized in that: The light shadow collector (120) comprises a filter and a high-frame-rate camera, and the size of the filter is the same as the lens diameter of the high-frame-rate camera.

6. A method for centering femtosecond laser ophthalmic keratometric surgery based on the centering system for femtosecond laser ophthalmic keratometric surgery according to any one of claims 1 to 4, characterized in that, The high-frame-rate camera has a focal length of 60-144 fps, a pixel of 1-8 million, and a resolution of 1080p-8k. The center positioning method comprises the following steps: S1: before corneal refractive surgery, an iris image taken during patient examination is pre-recorded into the central processing component (200) of a treatment device; S2: the central processing component (200) collects iris image information of the patient and generates an iris simulation image of the patient; S3: the treatment bed is moved to make the real-time image of the treated eye of the patient displayed in the real-time display component (300) coincide with the corneal vertex of the iris simulation image, so that the center of the eye axis of the patient coincides with the machining center of the femtosecond laser, and the center positioning of the corneal surgery is completed; S4: taking the corneal vertex as the center, the central processing component (200) calculates the spin angle of the eye of the patient by comparing the included angle between the real-time image and the iris simulation image.

7. A computer readable storage medium characterized in that, The storage medium stores a computer program, and when the computer program is executed by a processor, the center positioning method for femtosecond laser ophthalmic corneal refractive surgery is realized.

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