A macular fovea detection and back image generation apparatus

Abstract

The application discloses a macular fovea detection and afterimage generation device, which comprises a light source mechanism, a camera mechanism and a light path mechanism, wherein the light source mechanism comprises a first moving component, a first light emitting part, a second light emitting part and a third light emitting part, the first light emitting part and the second light emitting part are arranged on the movable end of the first moving component; the camera mechanism comprises a binocular camera, a camera and a focusing assembly, the focusing assembly is arranged between the binocular camera and the camera, and the camera faces the binocular camera; the light path mechanism is arranged between the light source mechanism and the binocular camera; and the shielding mechanism comprises a disc and a second moving component, the disc is a transparent disc, the disc is arranged between the binocular camera and the light path mechanism, a plurality of shielding pieces with different sizes are arranged on the disc in a circumferential direction, and the second moving component drives the disc to move so that the shielding pieces are aligned with the macular fovea. The device realizes automatic positioning and automatic tracking of the macular fovea, has a simple structure, reduces production cost and improves the effect of amblyopia correction.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to a device for detecting the fovea of ​​the macula and generating afterimages. Background Technology

[0002] Amblyopia is a common developmental visual disorder in childhood. During the critical period of visual development, abnormal visual experiences can affect visual perception, resulting in best-corrected visual acuity in one or both eyes being lower than the normal level for children of the same age, without any organic lesions. Currently, amblyopia can be corrected by occluding the fovea to create a limited visual window, thus repositioning the fixation point to the fovea. The key lies in the precise positioning of the fovea, which requires adaptation to eye movement and visualization of the occluded area. However, existing devices struggle to achieve dynamic, high-precision fovea tracking and occlusion control, resulting in insufficient afterimage formation accuracy and affecting the corrective effect. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a fovea detection and afterimage generation device that can locate and automatically track occluded fovea, thereby improving the amblyopia correction effect.

[0004] A fovea detection and afterimage generation device according to an embodiment of the present invention includes: a light source mechanism, a camera mechanism, an optical path mechanism, and a blocking mechanism; the light source mechanism includes a first moving component, a first light-emitting element, a second light-emitting element, and a third light-emitting element, wherein the first light-emitting element and the second light-emitting element are both disposed at the movable end of the first moving component to drive the first light-emitting element and the second light-emitting element to switch back and forth; the camera mechanism includes a binocular camera, a camera, and a focusing component, wherein the focusing component is disposed between the binocular camera and the camera, and the camera faces the binocular camera; the optical path mechanism is disposed between the light source mechanism and the binocular camera, and the optical path mechanism is used to guide the light emitted by the first light-emitting element, the second light-emitting element, and the third light-emitting element to the binocular camera; the blocking mechanism includes a disk and a second moving component, wherein the disk is a transparent disk, the disk is disposed between the binocular camera and the optical path mechanism, and a plurality of blocking plates of different sizes are disposed on the disk along the circumference; the second moving component drives the disk to move so that the blocking plates are aligned with the fovea.

[0005] In some embodiments of the present invention, the first moving component includes a first motor and a turntable, the first moving component drives the turntable to rotate, and the first light-emitting element and the second light-emitting element are arranged circumferentially on the turntable, with the first light-emitting element and the second light-emitting element emitting light downwards.

[0006] In some embodiments of the present invention, the first light-emitting element includes four LED beads, which are arranged in a matrix.

[0007] In some embodiments of the present invention, the third light-emitting element includes a third moving component and a dot-shaped light-emitting element, the third moving component drives the dot-shaped light-emitting element to move in a vertical or horizontal direction, and the dot-shaped light-emitting element emits light in a horizontal direction.

[0008] In some embodiments of the present invention, the optical path mechanism includes a first beam splitter, a second beam splitter, and a polarizer. The polarizer is disposed between the first beam splitter and the second beam splitter. The first beam splitter is used to refract the light emitted by the third light-emitting element toward the second beam splitter. The second beam splitter is used to refract the light emitted by the first light-emitting element and the second light-emitting element toward the binocular camera. The polarizer is used to filter the light emitted by the first light-emitting element and the second light-emitting element.

[0009] In some embodiments of the present invention, the focusing assembly includes a fourth moving component and a filter, the filter being disposed between the binocular camera and the camera, the fourth moving component driving the filter to move so that the filter enters or leaves the space between the binocular camera and the camera.

[0010] In some embodiments of the present invention, the focusing assembly includes a fifth moving component and a focusing lens, the focusing lens being disposed between the binocular camera and the filter, and the fifth moving component driving the focusing lens to move in a horizontal direction to adjust the distance between the focusing lens and the binocular camera.

[0011] In some embodiments of the present invention, the second beam splitter is located between the binocular camera and the focusing lens, and an analyzer is provided between the second beam splitter and the focusing lens.

[0012] Compared with the prior art, the fovea detection and afterimage generation device of this invention has the following advantages: (1) Place both eyes in the binocular camera, emit white light through the first light-emitting element, the white light shines into the binocular camera through the optical path mechanism, the white light shines into the fundus, and the white light is reflected out through the fundus. After the focusing component is adjusted, the camera obtains a clear fundus image. The position of the fovea of ​​the macula can be determined through the fundus image. At the same time, emit a near-infrared point light source through the third light-emitting element. The near-infrared beam shines into the binocular camera through the optical path mechanism and forms a fixation point on the fundus. The reflected light from the fundus passes through the focusing component, and the camera obtains the position of the near-infrared light point focused on the fundus. By merging and comparing with the fundus image, the fixation nature can be obtained, and it can be known whether the eyes have amblyopia. (2) The second light-emitting element is switched by the first moving part. The second light-emitting element emits near-infrared light and white light. The camera obtains the fundus image through the reflected light from the fundus and obtains the position of the fovea. Then, based on the size of the fovea in the previous fundus image, the second moving part drives the disk to rotate and selects a suitable size occluder. According to the position of the fovea in the near-infrared fundus image, the first moving part drives the disk to move so that the occluder blocks the fovea. Then, the position of the fovea is corrected by the white light of the second light-emitting element. During the white light shining process, the first moving part automatically adjusts the position of the occluder according to the real-time near-infrared image of the fovea obtained by the camera. This realizes that the fovea is automatically tracked and blocked during the white light shining process, which improves the accuracy of afterimage formation and enhances the correction effect. At the same time, the structure is simple and the production cost is reduced. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a fovea detection and afterimage generation device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the first and second light-emitting elements in a fovea detection and afterimage generation device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a disk in a macular fovea detection and afterimage generation device according to an embodiment of the present invention.

[0014] Explanation of reference numerals in the attached figures: First motor 111; turntable 112; first light-emitting element 120; second light-emitting element 130; third light-emitting element 140; third moving part 141; dot-shaped light-emitting element 142; Binocular camera 210; camera 220; fifth motion component 231; focusing lens 232; filter 233; analyzer 234; first beam splitter 311; second beam splitter 312; polarizer 320; Second moving part 410; disc 420; shield 421. Detailed Implementation

[0015] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0016] In this invention, the term "gaze nature" is a technical term that includes central fixation, eccentric fixation, peripheral fixation, and peripheral fixation, which correspond to the human eye's visual field of less than 1°, between 1° and 3°, between 3° and 5°, and greater than 5°, respectively.

[0017] like Figures 1 to 3As shown, an embodiment of the present invention provides a fovea detection and afterimage generation device, comprising: a light source mechanism, a camera mechanism, and an optical path mechanism; the light source mechanism includes a first moving component, a first light-emitting element 120, a second light-emitting element 130, and a third light-emitting element 140, wherein the first light-emitting element 120 and the second light-emitting element 130 are both disposed at the movable end of the first moving component to drive the first light-emitting element 120 and the second light-emitting element 130 to switch back and forth; the camera mechanism includes a binocular camera 210, a camera 220, and a focusing assembly, wherein the focusing assembly is disposed between the binocular camera 210 and the camera 220, and the camera 220 has a surface... The system includes a binocular camera 210; an optical path mechanism, located between the light source mechanism and the binocular camera 210, which guides the light emitted by the first light-emitting element 120, the second light-emitting element 130, and the third light-emitting element 140 toward the binocular camera 210; and a blocking mechanism, including a disc 420 and a second moving component 410. The disc 420 is a transparent disc and is located between the binocular camera 210 and the optical path mechanism. Multiple blocking plates 421 of different sizes are arranged circumferentially on the disc 420. The second moving component 410 drives the disc 420 to move so that the blocking plates 421 are aligned with the fovea of ​​the macula.

[0018] When the eye looks towards the binocular camera 210, white light is emitted through the first light-emitting element 120. The white light is directed to the binocular camera 210 through the optical path mechanism and illuminates the fundus area. The reflected light from the fundus is focused by the focusing component and clearly captured by the camera 220, obtaining a fundus image containing only fundus information. At the same time, a near-infrared beam is emitted through the third light-emitting element 140. The near-infrared beam is guided by the optical path mechanism to the eyeball inside the binocular camera 210 and enters the fundus along the visual axis. The eyeball automatically adjusts so that the near-infrared beam falls on the fovea centralis. After focusing by the focusing component, the camera 220 obtains a fundus image containing fixation characteristics, which can detect whether amblyopia exists.

[0019] The first moving component activates, switching the light source from the first light-emitting element 120 to the second light-emitting element 130. The second light-emitting element 130 can simultaneously emit near-infrared light and white light. The near-infrared light and white light are guided by the optical path mechanism and simultaneously directed towards the eyeball inside the binocular camera 210. Then, the light returns along the optical path mechanism, forming a fundus image with gaze characteristics in the camera 220 and determining the position of the fovea. Based on the size of the fovea displayed in the fundus image, a suitable size occluder 421 is selected. The second moving component 410 drives the disk 420 to rotate, placing the selected occluder 421 between the binocular camera 210 and the emission end of the optical path mechanism. Then, the second moving component 410 drives the disk 420 to rotate. 20. The position of the occluder 421 is adjusted vertically and horizontally to ensure that the occluder 421 blocks the fovea of ​​the macula. Then, white light emitted by the second light-emitting element 130 illuminates the fundus, while the white light is filtered by the filter 233 in the focusing assembly, allowing the camera 220 to acquire and form a near-infrared fundus image. This facilitates real-time tracking and positioning of the fovea by the camera 220, reducing interference from white light. The second moving part 410 automatically adjusts the position of the occluder 421. During the white light illumination, the occluder 421 maintains its blocking of the fovea of ​​the macula, achieving automatic tracking and blocking of the fovea of ​​the macula, ensuring the blocking effect, high degree of automation, improved correction efficiency, and simple structure, reducing equipment costs.

[0020] It should be noted that the disk 420 is made of optical glass, and light is blocked by attaching a shielding plate 421 to the disk 420. Furthermore, the disk 420 has areas that allow white light to pass through, facilitating the capture of fundus images, compressing the structure of the device, and reducing its size. Additionally, the second moving part 410 is a multi-axis linear slide module. Multi-axis linear slide modules are existing technology and can achieve movement in the horizontal, vertical, and rotational directions, which will not be described in detail here.

[0021] Understandably, referring to Figure 1 and Figure 2 The first moving component includes a first motor 111 and a turntable 112. The first moving component drives the turntable 112 to rotate. A first light-emitting element 120 and a second light-emitting element 130 are circumferentially arranged on the turntable 112, with the first light-emitting element 120 and the second light-emitting element 130 emitting light downwards. When it is necessary to switch between the first light-emitting element 120 and the second light-emitting element 130, the first motor 111 of the first moving component is activated, driving the turntable 112 to rotate in the horizontal plane. This allows the first light-emitting element 120 or the second light-emitting element 130 to be rotated to the designated light-emitting position, realizing the back-and-forth switching of the two light-emitting elements, improving switching efficiency, and enhancing stability during switching. Furthermore, since both the first light-emitting element 120 and the second light-emitting element 130 emit light downwards, it ensures that the light can be accurately directed to the downward optical path mechanism, reducing light loss and improving light utilization efficiency.

[0022] Understandably, referring to Figure 2 The first light-emitting element 120 includes four LED beads arranged in a matrix. The matrix arrangement of the four LED beads ensures that light is emitted evenly from the four directions of the matrix, forming four point lighting spots, avoiding the uneven light caused by single-bead illumination and improving the lighting quality.

[0023] Understandably, referring to Figure 1 The third light-emitting element 140 includes a third moving component 141 and a dot-shaped light-emitting element 142. The third moving component 141 drives the dot-shaped light-emitting element 142 to move vertically or horizontally, and the dot-shaped light-emitting element 142 emits light in the horizontal direction. The dot-shaped light-emitting element 142 emits a near-infrared beam, which forms a red dot on the fundus after entering the eyeball. The relative positions of different eyeballs in the binocular camera 210 will be different. By driving the dot-shaped light-emitting element 142 to move through the third moving component 141, the position of the dot-shaped light-emitting element 142 is adjusted so that the near-infrared beam enters the center point along the visual axis of the eye, ensuring accurate gaze information and improving detection accuracy. It should be noted that the third moving component 141 is a linear slide module.

[0024] Understandably, referring to Figure 1 The optical path mechanism includes a first beam splitter 311, a second beam splitter 312, and a polarizer 320. The polarizer 320 is positioned between the first beam splitter 311 and the second beam splitter 312. The first beam splitter 311 refracts the light emitted by the third light-emitting element 140 towards the second beam splitter 312. The second beam splitter 312 refracts the light emitted by the first light-emitting element 120 and the second light-emitting element 130 towards the eyeball located in the binocular camera 210. The polarizer 320 filters the light emitted by the first light-emitting element 120 and the second light-emitting element 130. Utilizing the light refraction principle of the beam splitter, the first beam splitter 311 changes the propagation direction of the light from the third light-emitting element 140 and guides it to the second beam splitter 312. The second beam splitter 312 further refracts all the light towards the eyeball located in the binocular camera 210, achieving concentrated transmission of multiple beams of light. This ensures that the light from each light-emitting element can be accurately directed towards the binocular camera 210, simplifying the optical path structure and reducing light loss. The 320 polarizer effectively filters stray light, improves light purity, avoids stray light interference with imaging, and makes the acquired fundus images clearer, providing high-quality image support for accurate positioning of the fovea of ​​the macula.

[0025] Understandably, referring to Figure 1The focusing assembly includes a fourth moving component and a filter 233. The filter 233 is positioned between the binocular camera 210 and the camera 220. The fourth moving component drives the filter 233 to move, allowing it to enter or leave the space between the binocular camera 210 and the camera 220. When capturing fundus image information, the fourth moving component drives the filter 233 away from the space between the binocular camera 210 and the camera 220 to prevent filtered light from affecting the accuracy of the fundus image information. When white light glare is activated, the fourth moving component drives the filter 233 to move between the binocular camera 210 and the camera 220 to filter the white light, avoiding interference from white light glare. The camera 220 acquires near-infrared fundus images and uses these images to locate the fovea centralis, improving the accuracy of the fovea centralis location. Through the cooperation of the fourth moving component and the filter 233, the device can flexibly adapt to different usage scenarios, improving its usability and ensuring the continuity of detection and imaging while reducing external interference. It should be noted that the fourth moving part is a linear slide module.

[0026] Understandably, referring to Figure 1 The focusing assembly includes a fifth motion component 231 and a focusing lens 232. The focusing lens 232 is positioned between the binocular camera 210 and the camera 220. The fifth motion component 231 drives the focusing lens 232 to move horizontally to adjust the distance between the focusing lens 232 and the binocular camera 210. A fourth motion component is activated, driving the focusing lens 232 to move back and forth horizontally, changing the distance between the focusing lens 232 and the binocular camera 210. Based on the image clarity acquired by the camera 220, the position of the focusing lens 232 is continuously adjusted until the camera 220 can acquire clear images of the human eye and fundus, adapting to different patients' refractive states and eye positions, and improving the positioning accuracy of the fovea. It should be noted that the fifth motion component 231 is a linear slide module.

[0027] Understandably, referring to Figure 1 The second beam splitter 312 is located between the binocular camera 210 and the focusing lens 232, and an analyzer 234 is provided between the second beam splitter 312 and the focusing lens 232. By placing the second beam splitter 312 between the binocular camera 210 and the focusing lens 232, space can be saved and the size of the device can be reduced. However, the light reflected from the binocular camera 210 will generate stray light when passing through the second beam splitter 312. By setting up the analyzer 234, the light is filtered, so that the light of the required specific direction is directed to the camera 220. With the help of the filter 233, double filtering is achieved to improve the purity of the light, further avoid interference with imaging, make the image of the camera 220 clear, improve the image contrast, improve the positioning accuracy of the fovea, provide a guarantee for the accurate occlusion of the fovea and the generation of a high-quality afterimage, and improve the amblyopia correction effect.

[0028] In summary, this invention provides a device for detecting the fovea of ​​the macula and generating an afterimage. The eyes are placed within a binocular camera 210. White light is emitted by a first light-emitting element 120 and illuminates the binocular camera 210 through an optical path mechanism. The white light then enters the fundus and is reflected back out. After focusing by a focusing component, the camera 220 acquires a clear fundus image. The position of the fovea of ​​the macula can be determined from this image. Simultaneously, a near-infrared point light source is emitted by a third light-emitting element 140. The near-infrared beam is directed towards the binocular camera 210 through an optical path mechanism, forming a fixation point on the fundus. The reflected light from the fundus passes through the focusing component, and the camera 220 acquires the position of the near-infrared point focused on the fundus. By merging and comparing this with the fundus image, the fixation nature is obtained, thus determining whether amblyopia exists. The first moving component switches the second light-emitting element 130, which emits near-infrared light and white light. The camera 220 obtains a fundus image through the reflected light from the fundus, thus determining the position of the fovea centralis. Then, based on the size of the fovea centralis in the previous fundus image, the second moving component 410 drives the disk 420 to rotate, selecting a suitable size blocking plate 421. According to the position of the fovea centralis in the near-infrared image, the first moving component drives the disk 420 to move, causing the blocking plate 421 to block the fovea centralis. Then, the position of the fovea centralis is corrected by the white light emitted by the second light-emitting element 130. During the white light illumination process, the first moving component automatically adjusts the position of the blocking plate 421 according to the real-time near-infrared image of the fovea centralis acquired by the camera 220, realizing automatic tracking and blocking of the fovea centralis during the white light illumination process, improving the accuracy of afterimage formation, enhancing the correction effect, and at the same time simplifying the structure and reducing production costs.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A device for detecting the fovea of ​​the macula and generating afterimages, characterized in that, Including: The light source mechanism includes a first moving component, a first light-emitting element, a second light-emitting element, and a third light-emitting element. The first light-emitting element and the second light-emitting element are both disposed at the movable end of the first moving component to drive the first light-emitting element and the second light-emitting element to switch back and forth. A camera mechanism includes a binocular camera, a camera, and a focusing assembly, wherein the focusing assembly is disposed between the binocular camera and the camera, and the camera faces the binocular camera. An optical path mechanism is disposed between the light source mechanism and the binocular camera. The optical path mechanism is used to guide the light emitted by the first light-emitting element, the second light-emitting element and the third light-emitting element toward the binocular camera. The masking mechanism includes a disc and a second moving component. The disc is a transparent disc and is disposed between the binocular camera and the optical path mechanism. Multiple masking plates of different sizes are arranged circumferentially on the disc. The second moving component drives the disc to move so that the masking plates are aligned with the fovea of ​​the macula.

2. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 1, characterized in that, The first moving component includes a first motor and a turntable. The first moving component drives the turntable to rotate. The first light-emitting element and the second light-emitting element are arranged circumferentially on the turntable, and the first light-emitting element and the second light-emitting element emit light downwards.

3. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 2, characterized in that, The first light-emitting element includes four LED beads, which are arranged in a matrix.

4. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 1, characterized in that, The third light-emitting element includes a third moving component and a dot-shaped light-emitting element. The third moving component drives the dot-shaped light-emitting element to move in a vertical or horizontal direction, and the dot-shaped light-emitting element emits light in a horizontal direction.

5. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 1, characterized in that, The optical path mechanism includes a first beam splitter, a second beam splitter, and a polarizer. The polarizer is disposed between the first beam splitter and the second beam splitter. The first beam splitter is used to refract the light emitted by the third light-emitting element toward the second beam splitter. The second beam splitter is used to refract the light emitted by the first light-emitting element and the second light-emitting element toward the binocular camera. The polarizer is used to filter the light emitted by the first light-emitting element and the second light-emitting element.

6. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 5, characterized in that, The focusing assembly includes a fourth moving part and a filter. The filter is disposed between the binocular camera and the camera. The fourth moving part drives the filter to move so that the filter can be inserted into or removed from the binocular camera and the camera.

7. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 6, characterized in that, The focusing assembly includes a fifth moving part and a focusing lens. The focusing lens is disposed between the binocular camera and the filter. The fifth moving part drives the focusing lens to move in a horizontal direction to adjust the distance between the focusing lens and the binocular camera.

8. The device for detecting the fovea of ​​the macula and generating afterimages according to claim 7, characterized in that, The second beam splitter is located between the binocular camera and the focusing lens, and an analyzer is provided between the second beam splitter and the focusing lens.

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