Strabismus measuring instrument

Abstract

The utility model relates to the technical field of strabismus measurement and evaluation, in particular to a strabismus measuring instrument. The strabismus measuring instrument comprises an image capturing module, the image capturing module comprises a main camera located in the middle and 2n auxiliary cameras symmetrically distributed on the left side and the right side of the main camera, and n = 1, 2 or 3. According to the strabismus degree measuring method and device, the multiple cameras are arranged so that the eye images can be captured from different angles, eye movement information can be obtained more comprehensively, errors and deviation possibly caused by a single view angle can be reduced, and therefore the strabismus degree measuring accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the field of strabismus measurement and evaluation technology, and specifically to a strabismus measuring instrument. Background Technology

[0002] Strabismus is a common clinical eye condition affecting 2%-5% of the population. It refers to the inability of the two eyes to coordinate properly when using both eyes, resulting in inconsistent visual lines. Eye misalignment is a common feature in strabismus patients. When making eye contact with a strabismus patient, the misalignment of their eyes may cause confusion for others.

[0003] Strabismus is not only a cosmetic defect, but it also triggers a wide range of visual impairments, such as diplopia, amblyopia, and impaired stereopsis, leading to impaired motor skills, especially during visual-motor tasks such as grasping or postural stability. In addition, strabismus can have a range of negative psychological and mental effects on patients.

[0004] To accurately diagnose strabismus and assess its severity, doctors typically use strabismus measuring instruments to observe the patient's eye movements and alignment. Existing strabismus measuring instruments generally include a display module, an image capture module, and a processing module. The display module shows the visual stimuli for the patient to observe, the image capture module records the patient's response to the visual stimuli in at least one eye, and the processing module uses these images to determine the patient's eye misalignment. In existing strabismus measurement techniques, the image capture module typically uses a camera fixed in the center of the strabismus measuring instrument's cavity to capture images of the pupils of each eye. This method has several major drawbacks: 1) Single-viewpoint limitation: Using a single camera to capture images of the eyeball from a fixed angle may not fully capture the eye's movement at different angles, especially in complex or dynamic gaze-tracking tasks. 2) Accuracy issues: Due to the fixed camera position, it is difficult to precisely adjust it to accommodate differences in facial structure and eye position among different patients, which may lead to poor image quality and affect the accuracy of subsequent data analysis. The fixed camera design lacks sufficient flexibility, preventing rapid changes in viewing angle or distance as needed, limiting its application in various clinical settings. 3) For patients, maintaining a specific posture for extended periods while being photographed with a fixed camera can be uncomfortable, especially for children who are more likely to develop resistance, which is detrimental to obtaining high-quality examination results. Therefore, existing technology still needs improvement. Utility Model Content

[0005] In view of this, the present invention proposes a strabismus measuring instrument, which can at least solve the technical problems of poor detection accuracy and inaccurate results that existing strabismus measuring instruments are prone to have.

[0006] The strabismus measuring instrument of this utility model includes: an image capture module, which includes a main camera located in the middle and 2n auxiliary cameras symmetrically distributed on the left and right sides of the main camera, where n=1, 2, 3.

[0007] In some embodiments, 2n auxiliary cameras are spaced apart from the main camera along a reference arc.

[0008] Each auxiliary camera is set to be horizontally deflected at a preset angle toward the main camera; the angles of the n auxiliary cameras on the same side of the main camera gradually increase from the direction closer to the main camera toward the direction further away from the main camera.

[0009] In some embodiments, the image capture module further includes a near-infrared illumination source, which is used to provide illumination for the main camera and / or 2n auxiliary cameras.

[0010] In some embodiments, the strabismus measuring instrument also includes a main unit housing and a base.

[0011] A measurement window is provided on the main unit casing, and the image capture module is located inside the main unit casing and is positioned opposite the measurement window.

[0012] The base is located at the bottom of the main unit casing and is detachably connected to the main unit casing; the base integrates a power module, a filter module, a hub, a control circuit, and an integrated interface for connecting to external devices.

[0013] In some embodiments, the base has ventilation windows on its side.

[0014] In some embodiments, the main unit housing is further provided with a display window, which is disposed opposite to the measurement window. The strabismus measuring instrument also includes a display module, which includes a display screen module and a rotation limiting mechanism. The display screen module is disposed on the display window and can be rotated up and down around a horizontal axis through the rotation limiting mechanism.

[0015] In some embodiments, the display screen module includes a screen housing and a display screen disposed on the screen housing; the rotation limiting mechanism includes two limiting sleeves and two spring pillars, the two limiting sleeves are respectively fixedly installed on the left and right sides of the display window, and the limiting sleeves include at least an annular structure, the left and right sides of the screen housing are rotatably fitted on the outer side of the annular structure, and the end face of the annular structure is provided with two limiting grooves.

[0016] Each spring post includes a sleeve, a spring, and a columnar top. The sleeve is installed on the screen housing and is positioned opposite to the limiting sleeve. A hollow cavity is provided inside the sleeve along the axial direction. The spring is located inside the hollow cavity. The columnar top is sleeved on the outside of the spring and slides with the sleeve. The columnar top has a limiting state of being inserted into the limiting groove and a transition state of sliding along the end face of the annular structure.

[0017] In some embodiments, the central angle corresponding to the two limiting grooves is 180°, and the columnar top is in the limiting state of inserting into the limiting groove when the display screen module is in the vertical downward or vertical upward state.

[0018] In some embodiments, the main camera and the auxiliary camera are positioned below the display window and at the same height, and the main camera and the auxiliary camera have the same elevation angle.

[0019] In some embodiments, the main camera and the auxiliary camera are provided with fine-tuning structures to enable the camera to follow the patient's head or eye movements.

[0020] The beneficial effects of this invention are as follows: By configuring the image capture module to include a main camera located in the center and 2n auxiliary cameras symmetrically distributed on both sides of the main camera, this invention can capture eye images from different angles, providing more comprehensive information on eye movement. This helps reduce errors and deviations that may arise from a single viewpoint, thereby improving the accuracy of strabismus measurement. Furthermore, this design allows for adjustment of the number of auxiliary cameras according to specific needs, ensuring the measuring instrument remains efficient and accurate under different conditions. It avoids problems such as unclear capture and poor accuracy caused by slight head rotation during the patient's examination. Although this configuration increases the number of cameras, through reasonable design and optimization, costs can be controlled while maintaining performance. Compared to a single camera in the prior art, it eliminates the need for a high-performance processing module for compensation, thus improving overall cost-effectiveness. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a front view reference diagram of a strabismus measuring instrument provided in one embodiment of the present invention;

[0023] Figure 2 A rear view reference diagram of a strabismus measuring instrument provided in one embodiment of the present invention;

[0024] Figure 3 A partial cross-sectional view of a strabismus measuring instrument provided in one embodiment of the present invention;

[0025] Figure 4A schematic diagram of the rotation limiting mechanism of a strabismus measuring instrument provided in one embodiment of the present utility model;

[0026] Figure 5 A diagram showing the structural fit between the rotation limiting mechanism and the display screen module of a strabismus measuring instrument provided in one embodiment of this utility model;

[0027] Figure 6 A schematic diagram showing the display screen module of a strabismus measuring instrument in a first position according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram showing the display screen module of a strabismus measuring instrument in a second position according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Image capture module; 101. Main camera; 102. Auxiliary camera; 103. Infrared illumination source; 2. Display module; 21. Display screen module; 211. Screen housing; 212. Display screen; 22. Rotation limit mechanism; 221. Limit sleeve; 2211. Limit groove; 222. Spring column; 2221. Sleeve; 2222. Columnar top; 23. Reflector; 3. Main unit housing; 301. Display window; 302. Measurement window; 4. Base; 401. Heat dissipation window; 402. Foot; 403. Integrated interface. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to specific examples and accompanying drawings.

[0032] It should be noted that the directional terms used in the embodiments of this utility model, such as "up," "down," "left," and "right," generally refer to the directions shown in the accompanying drawings. Similarly, all expressions such as "first" and "second" used in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first," "second," etc., are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not elaborate on this point.

[0033] This utility model provides a strabismus measuring instrument, such as Figures 1 to 3As shown, the system includes an image capture module 1, which comprises a main camera 101 located in the center and 2n auxiliary cameras 102 symmetrically distributed on the left and right sides of the main camera 101, where n = 1, 2, or 3, meaning there can be 2, 4, or 6 auxiliary cameras 102. This application allows for the selection of different numbers of auxiliary cameras 102 based on the specific needs of the subject and the real-time position of their face, adapting to different measurement scenarios and requirements. Specifically, the main camera 101 and auxiliary cameras 102 have identical structures and are both capable of recording and observing images or videos of the patient's eyes in relation to visual stimuli. For example, both the main camera 101 and auxiliary cameras 102 may include cameras with a resolution of 1280(H) × 1024(V) and operating at a frame rate of 210fps, enabling clear capture of images showing the pupils of each of the patient's eyes during testing. Depending on the design of the test being performed, the camera 104 may be a panchromatic imager or an imager that operates only within a specific color range, such as infrared.

[0034] This application configures the image capture module 1 to include a main camera 101 located in the center and 2n auxiliary cameras 102 symmetrically distributed on both sides of the main camera 101. This allows for the capture of eye images from different angles, providing more comprehensive eye movement information and helping to reduce errors and deviations that may arise from a single viewpoint, thereby improving the accuracy of strabismus measurement. Furthermore, this design allows for adjustment of the number of auxiliary cameras 102 according to specific needs, ensuring the measuring instrument remains efficient and accurate under different conditions. It avoids problems such as unclear capture and poor accuracy caused by slight head rotation during the patient's examination. Although this configuration increases the number of cameras, through reasonable design and optimization, it can control costs while maintaining performance. Compared to a single camera in existing technologies, it eliminates the need for a high-performance processing module for compensation, improving overall cost-effectiveness.

[0035] In some embodiments, 2n auxiliary cameras 102 are spaced apart from the main camera 101 along a reference arc. Each auxiliary camera 102 is configured to be horizontally deflected by a preset angle toward the main camera 101; along the direction away from the main camera 101, the deflection angles of the n auxiliary cameras 102 on the same side of the main camera 101 gradually increase.

[0036] Specifically, when n=1, there are two auxiliary cameras 102, each of which is horizontally deflected towards the main camera 101 by a first preset angle; see reference for details. Figure 3As shown in the figure, the main camera 101 is directly facing the patient's face, and two auxiliary cameras 102 are symmetrically distributed on both sides of the main camera 101, with a distance of 89mm between each auxiliary camera 102 and the main camera 101. Each auxiliary camera 102 is horizontally deflected 10° towards the main camera 101 to capture eye images more accurately.

[0037] When n=2, the two auxiliary cameras 102 closer to the main camera 101 are horizontally deflected towards the main camera 101 by a first preset angle, and the two auxiliary cameras 102 farther away from the main camera 101 are horizontally deflected towards the main camera 101 by a second preset angle, wherein the second preset angle is greater than the first preset angle. Preferably, the two auxiliary cameras 102 farther away from the main camera 101 are horizontally deflected towards the main camera 101 by 45°.

[0038] When n=3, two additional auxiliary cameras 102 are added to the original four auxiliary cameras 102. Preferably, the two auxiliary cameras 102 furthest from the main camera 101 are horizontally deflected by 60° towards the main camera 101 to collect facial feature information of the patient, which facilitates the capture of the patient's facial movements and the determination of the position of the patient's eyes relative to the face.

[0039] In some embodiments, the image capture module 1 further includes a near-infrared illumination source 103, which provides illumination for the main camera 101 and / or 2n auxiliary cameras 102. Figure 3 As shown, an infrared illumination source 103 is positioned below the main camera 101 to provide clear illumination for both the main camera 101 and / or the 2n auxiliary cameras. Additionally, an infrared illumination source 103 can be positioned below each auxiliary camera 102 to increase the illumination range. The light source is located away from the camera's optical axis, resulting in a dark pupil in the image. The infrared illumination source 103 may include an infrared LED (wavelength 850nm), which is invisible to the patient, enabling recording without distracting the patient. The radiation intensity of the LED can be measured using an optical power meter (PM400, Thorlabs, USA) to keep it well below the exposure risk level.

[0040] In some embodiments, the strabismus measuring instrument further includes: a main unit housing 3 and a base 4. For example... Figure 1As shown, a measurement window 302 is provided on the front side of the main unit casing 3, and the image capture module 1 is located inside the main unit casing 3, opposite to the measurement window 302. In another embodiment, two symmetrically arranged auxiliary cameras 102 are grouped together. When n=2, the auxiliary cameras 102, located away from the main camera 101, are respectively positioned near the left and right bottom corners of the measurement window 302, and their orientation angles are adjustable. When n=3, two groups of auxiliary cameras 102 are respectively positioned near the left and right bottom corners and the left and right top corners of the measurement window 302, and the orientation angle of each auxiliary camera 102 is adjustable. This arrangement allows for facial imaging from multiple positions and angles. The larger the coverage area of ​​the camera group, the more complete the acquisition of facial features, and the more accurate the strabismus detection results.

[0041] When the patient is observed, their face is turned towards the measurement window 302. The main camera 101 and / or the auxiliary camera 102 record and observe images or videos of the patient's eyes under visual stimulation. The main unit housing 3, as the external structure of the strabismus measuring instrument, primarily protects the internal image capture module 1, control circuitry, and other key components from interference and damage from external environmental factors. The base 4 is located below the main unit housing 3 and is detachably connected to it; for example... Figure 2 As shown, the base 4 has several feet 402 at its bottom. The base 4 integrates a power module, a filter module, a hub, a control circuit, and an integrated interface 403 for connecting to external devices. The base 4 serves as the basic support structure for the squint measuring instrument, bearing the weight of the entire device and ensuring its stability during measurement. This application's integrated design simplifies the device's structure, improves its reliability and maintainability, and allows for the transmission of measurement data to external devices for further analysis and processing via the integrated interface 403.

[0042] In some embodiments, a heat dissipation window 401 is provided on the side of the base 4 to quickly dissipate the heat generated inside the base 4 and prevent the internal equipment from overheating and being damaged.

[0043] In some embodiments, the measuring window 302 is detachably configured, and the main camera 101, auxiliary camera 102, and near-infrared illumination source 103 are all detachably installed inside the main unit housing 3, facilitating maintenance of the camera and near-infrared illumination source 103 inside the main unit housing 3. Preferably, the main camera 101, auxiliary camera 102, and near-infrared illumination source 103 adopt a quick-release bracket + quick-release interface design. For example, the main camera 101 and several auxiliary cameras 102 are mounted on the same bracket, which is provided with a connector. The main unit housing 3 is provided with an interface corresponding to the connector, so as to facilitate the rapid assembly of the strabismus detector.

[0044] In some embodiments, such as Figure 2 As shown, a display window 301 is also provided on the main casing 3. The display window 301 is located on the rear side of the main casing 3, opposite to the measuring window 302. The strabismus measuring instrument also includes a display module 2, which includes a display screen module 21 and a rotation limiting mechanism 22. The display screen module 21 is rotatably mounted on the display window 301 around a horizontal axis via the rotation limiting mechanism 22, allowing the display screen module 21 to move between a first position and a second position, with the second position directly above the first position. Furthermore, as... Figure 7 As shown, a reflector 23 is also provided on the outer side of the strabismus measuring instrument. When the display module 2 is in the first position, the patient can directly view the content on the display screen module 21 through the measurement window 302, or the patient can indirectly view the content on the display screen module 21 in the second position through the measurement window 302 and the reflector 23 placed at a certain distance outside the display window 301. Preferably, the reflector 23 can help the patient observe the optical reflection of the visual stimulus, thereby increasing the optical distance between the visual stimulus and the patient's eyes. Advantageously, when the display screen module 21 is in the first position, a near-distance occlusion test of 33cm can be performed, and when the display screen module 21 is in the second position, a far-distance occlusion test of 6m can be performed. Its working principle is as follows. Figure 6 and Figure 7 As shown.

[0045] In some embodiments, such as Figure 5 As shown, the display screen module 21 includes a screen housing 211 and a display screen 212 disposed on the screen housing 211. The display screen 212 is used to display visual stimuli at different locations, such as different forms of the capital letter "E", making them visible to the patient's eyes. By analyzing the eye gaze direction based on the corresponding position of the image of one or both eyes relative to the visual stimuli, the physician can determine the patient's eye misalignment.

[0046] like Figure 4 and Figure 5As shown, the rotation limiting mechanism 22 includes two limiting sleeves 221 and two spring posts 2211. The two limiting sleeves 221 are fixedly installed on the left and right sides of the display window 301, and each limiting sleeve 221 includes at least an annular structure. The left and right sides of the screen housing 211 are rotatably fitted onto the outer side of the annular structure, and the end face of the annular structure is provided with two limiting grooves 222. Preferably, the left and right sides of the screen housing 211 are provided with circular holes fitted onto the outer side of the annular structure, and a bearing sleeve is provided between the hole wall and the annular structure. The groove wall of each limiting groove 222 smoothly transitions to the end face of the annular structure. Each spring post 2211 includes a sleeve 2221, a spring, and a columnar top 2222. The sleeve 2221 is installed in the groove of the screen housing 211 and is positioned opposite to the limiting sleeve 221. A hollow cavity is provided in the sleeve 2221 along the axial direction. The spring is disposed in the hollow cavity. The columnar top 2222 is sleeved on the outside of the spring and slides with the sleeve 2221. The columnar top 2222 has a limiting state of being inserted into the limiting groove 222 and a transition state of sliding along the end face of the annular structure. When the display screen module 21 is in the first position, the end of the columnar top 2222 is inserted into a limiting groove 222 under the pressure of the internal spring to restrict the rotation of the display screen module 21. During the process of the display screen module 21 flipping to the second position or rotating back from the second position to the first position, the spring column 2211 rotates synchronously with the display screen module 21 under the circumferential limitation of the limiting groove 222. During the rotation, the columnar top 2222 slides out from one limiting groove 222 and slides along the end face of the annular structure to another limiting groove 222.

[0047] In some embodiments, the central angle corresponding to the two limiting grooves 222 is 180°. When the display screen module 21 is in a vertically downward or vertically upward state, the columnar top 2222 is in a limiting state of inserting into the limiting groove 222. That is to say, when the display screen module 21 is in the first position or the second position, the columnar top 2222 is in a limiting state of inserting into the limiting groove 222 to restrict the movement of the display screen and ensure the normal conduct of the strabismus test. In some other embodiments, a first magnet is also provided on the screen housing 211, and a second magnet is provided on the host housing 3. The second magnet is correspondingly provided with the first magnet, and the first magnet and the second magnet are arranged such that when the display screen module 21 is in a vertically upward state, the first magnet and the second magnet attract each other, so that the display screen module 21 remains fixed after being in the second unfolded position (not shown in the figure). Preferably, a ratchet mechanism can also be provided between the limiting sleeve 221 and the screen housing 211 to achieve stepless positioning and multi-angle positioning. The ratchet mechanism can adopt the ratchet structure of the prior art, which will not be described in detail.

[0048] In some embodiments, such as Figure 3As shown, the main camera 101 and the auxiliary camera 102 are positioned below the display window 301 and at the same height, with the same elevation angle. The main camera 101 and the auxiliary camera 102 are placed at a low position in front of the patient's face, providing an unobstructed view of the target. Preferably, the elevation angle of both the main camera 101 and the auxiliary camera 102 is 15°.

[0049] In some embodiments, the main camera 101 and the auxiliary camera 102 are provided with fine-tuning structures to enable the main camera 101 and / or the auxiliary camera 102 to follow the patient's head or eye movements, so that each camera group can automatically and intelligently follow the changes in the patient's eye observation angle within a certain angle range and change synchronously, which can more accurately aim at the subject's eyes or head, thereby reducing measurement errors caused by angle deviation.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A strabismus measuring instrument, characterized in that, include: The image capture module (1) includes a main camera (101) located in the middle, and 2n auxiliary cameras (102) symmetrically distributed on the left and right sides of the main camera (101), where n=1, 2, 3; The main camera (101) and the auxiliary camera (102) acquire eye images of the subject from different angles.

2. The strabismus measuring instrument according to claim 1, characterized in that, The 2n auxiliary cameras (102) are spaced apart from the main camera (101) along a reference arc; Each auxiliary camera (102) is set to deflect horizontally at a preset angle toward the main camera (101); along the direction away from the main camera (101), the angles of the n auxiliary cameras (102) on the same side of the main camera (101) gradually increase.

3. The strabismus measuring instrument according to claim 2, characterized in that, The image capture module (1) further includes a near-infrared illumination source (103) for providing illumination for the main camera (101) and / or the 2n auxiliary cameras (102).

4. The strabismus measuring instrument according to claim 3, characterized in that, The strabismus measuring instrument also includes: The host casing (3) has a measurement window (302) and the image capture module (1) is located inside the host casing (3) and is positioned opposite to the measurement window (302). The base (4) is located below the main unit housing (3) and is detachably connected to the main unit housing (3); the base (4) integrates a power module, a filter module, a hub, a control circuit, and an integrated interface (403) for connecting to external devices.

5. The strabismus measuring instrument according to claim 4, characterized in that, The base (4) has a heat dissipation window (401) on its side.

6. The strabismus measuring instrument according to claim 4, characterized in that, The main unit housing (3) is also provided with a display window (301), which is arranged opposite to the measurement window (302). The strabismus measuring instrument also includes a display module (2), which includes a display screen module (21) and a rotation limiting mechanism (22). The display screen module (21) is rotatably mounted on the display window (301) around a horizontal axis via the rotation limiting mechanism (22).

7. The strabismus measuring instrument according to claim 6, characterized in that, The display screen module (21) includes a screen housing (211) and a display screen (212) disposed on the screen housing (211); the rotation limiting mechanism (22) includes two limiting sleeves (221) and two spring pillars (222). The two limiting sleeves (221) are respectively fixedly installed on the left and right sides of the display window (301), and the limiting sleeves (221) include at least an annular structure. The left and right sides of the screen housing (211) are rotatably fitted on the outside of the annular structure, and the end face of the annular structure is provided with two limiting grooves (2211). Each spring post (222) includes a sleeve (2221), a spring, and a columnar top (2222). The sleeve (2221) is installed on the screen housing (211) and is disposed opposite to the limiting sleeve (221). A hollow cavity is provided in the sleeve (2221) along the axial direction. The spring is disposed in the hollow cavity. The columnar top (2222) is sleeved on the outside of the spring and slides with the sleeve (2221). The columnar top (2222) has a limiting state of inserting into the limiting groove (2211) and a transition state of sliding along the end face of the annular structure.

8. The strabismus measuring instrument according to claim 7, characterized in that, The central angles of the two limiting grooves (2211) are 180°. When the display screen module (21) is in a vertically downward or vertically upward state, the columnar top (2222) is in a limiting state of being inserted into the limiting groove (2211).

9. The strabismus measuring instrument according to claim 7, characterized in that, The main camera (101) and the auxiliary camera (102) are located below the display window (301) and are set at the same height. The main camera (101) and the auxiliary camera (102) have the same elevation angle.

10. The strabismus measuring instrument according to claim 1, characterized in that, The main camera (101) and the auxiliary camera (102) are provided with fine-tuning structures for making the main camera (101) and / or the auxiliary camera (102) follow the patient's head or eye movements, respectively.

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