Strabismus measuring instrument
By designing a strabismus measuring instrument that includes a display module, an automatic shader, an image capture module, and a lens group, strabismus can be measured from a distance without the need for an additional mirror, improving the portability and measurement accuracy of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-04-07
AI Technical Summary
Existing strabismus measurement equipment requires a mirror to be placed 3 meters in front of the person's eyes when measuring strabismus at a distance of 6 meters, which limits the widespread use of the measuring instrument.
A strabismus measuring instrument was designed, comprising a display module, an automatic shading device, an image capture module, and a lens group. It uses optical methods to pull nearby objects further away, the automatic shading device selectively blocks the observer's eyes, the image capture module records multiple images, and the processing module determines the degree of eye misalignment.
This solves the problem of existing equipment requiring an additional mirror when measuring distances of 6m, improving the portability and accuracy of measurements.
Smart Images
Figure CN224085307U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of strabismus measurement technology, and in particular to a strabismus measuring instrument. Background Technology
[0002] Strabismus is a common clinical eye condition affecting 2%-5% of the population. Patients with strabismus cannot properly coordinate their eyes when looking. Eye misalignment is a common feature in strabismus patients. When making eye contact with a 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] The corneal light reflex test and the prism cover test (PCT) are two clinically applicable measurement methods. The former measures the type and angle of deviation based on the position of light reflected to the center of the pupil, while the latter requires the optometrist to alternately cover the eye, observe eye movements, and then estimate the degree of deviation. The corneal light reflex method is easy to perform on infants and young children with low cooperation, but its accuracy is insufficient. However, several limiting factors remain with the PCT, such as the physician's subjectivity in observing and estimating eye movements, the physician's training and experience level, and patient cooperation. Therefore, improving accuracy, efficiency, and operability may be necessary.
[0005] Existing strabismus measurement equipment requires the patient's eyes to be at a distance of 33cm (near) and 6m (far) from the target object. The equipment then measures the real-time strabismus degree at these distances. Measuring the strabismus degree at 33cm is straightforward; however, measuring it at 6m requires placing a mirror 3m in front of the patient, necessitating a certain spatial distance. This is inconvenient in hospitals and limits the widespread use of the measurement device.
[0006] CN 117694819 A discloses a strabismus assessment system and a strabismus assessment method. The strabismus assessment system includes a display module for displaying visual stimuli for an observer to observe; an image capture module for recording multiple images of at least one eye of the observer observing the visual stimuli; a processing module for determining the observer's eye misalignment based on the multiple images recorded by the image capture module; and an automatic occluder for selectively occluding one or both eyes of the observer during the assessment process. The automatic occluder includes a near-infrared filter and is controllable by a motion control unit. The display module includes a rotatable screen movable between a first unfolded position and a second unfolded position, through which the patient can indirectly view the screen unfolded in the second unfolded position via a reflector placed at a certain distance from the screen. This prior art adjusts the optical distance of the distance occlusion test by changing the relative position of the reflector with respect to the rotatable screen.
[0007] Therefore, there is room for improvement in the ability to extend the viewpoint of strabismus testing instruments. Utility Model Content
[0008] One of the technical problems that this utility model aims to solve is that existing strabismus measurement devices require a mirror to be placed 3 meters in front of the person's eyes when measuring strabismus at a distance of 6 meters, which limits the widespread use of the measuring device.
[0009] To solve the above-mentioned technical problems, this utility model provides a strabismus measuring instrument, comprising:
[0010] The display module is used to display visual stimuli for the observer to observe;
[0011] Automatic shutters are aligned with the display module and are used to selectively block one or both eyes of the observer, preventing the blocked eyes from observing visual stimuli.
[0012] An image capture module is used to record multiple images from at least one eye of an observer when viewing visual stimuli. The image capture module is positioned between the display module and the automatic shading device.
[0013] The processing module is used to determine the observer's eye misalignment based on multiple images recorded by the image capture module;
[0014] The lens group is used to optically zoom out of nearby objects; the lens group is positioned between the display module and the automatic sunshade.
[0015] The housing, display module, image capture module, automatic shading device, and lens group are respectively housed within the housing, and the display module, image capture module, and automatic shading device are respectively connected to the processing module.
[0016] In some embodiments, the housing includes an upper housing and a lower housing, wherein the upper housing is located above the lower housing and is detachably connected to the lower housing.
[0017] In some embodiments, an automatic light shield is disposed on the upper housing and located at the front end of the upper housing. The automatic light shield includes a measuring window, and the display module includes a screen aligned with the measuring window.
[0018] In some embodiments, the measurement window includes smart dimming glass, which is transparent for observation when not powered on and includes at least two blocking areas when powered on.
[0019] In some embodiments, the shape of the shading area of the measuring window is designable; the automatic shading device includes a control module configured to control the smart dimming glass of the measuring window to automatically adjust the shading area.
[0020] In some embodiments, the strabismus measuring device includes a chin rest and a forehead rest, which are disposed on a housing and are used to restrict the movement of the observer's head.
[0021] In some embodiments, the image capture module includes at least one set of cameras; the image capture module includes a near-infrared illumination source.
[0022] In some embodiments, the camera group has a fine-tuning structure, which can automatically and intelligently follow changes in the observer's eye's viewing angle within a certain angular range.
[0023] In some embodiments, the lens group includes a concave mirror and a convex mirror, which are located between the screen and the measurement window. The concave mirror and the convex mirror are arranged parallel and offset, with the surface of the convex mirror facing the screen and the surface of the concave mirror facing the measurement window. When viewed in a direction perpendicular to the concave mirror and the convex mirror, the concave mirror and the convex mirror have an overlapping area.
[0024] In some embodiments, the first distance between the observer's eye and the target at the center of the screen is 330 mm, the first width of the concave mirror is 150 mm, the second width of the convex mirror is 150 mm, the third width of the overlapping area of the concave and convex mirrors is 50 mm, the second distance between the center of the concave mirror and the center of the convex mirror is 150 mm, the vertical distance between the convex mirror and the target is 290 mm, the third distance between the edge of the concave mirror adjacent to the first inner wall of the housing and the first inner wall of the housing is 100 mm, and the fourth distance between the edge of the convex mirror adjacent to the second inner wall of the housing and the second inner wall of the housing is 100 mm.
[0025] Through the above technical solution, the strabismus measuring instrument provided by this utility model has an automatic light shield that can selectively block one or both eyes of the observer so that the blocked eyes cannot observe the visual stimuli displayed by the display module. The image capture module can record multiple images of at least one eye of the observer observing the visual stimuli. The processing module can determine the observer's eye misalignment based on the multiple images recorded by the image capture module. The lens group can optically pull nearby objects further away. The strabismus measuring instrument of this utility model solves the technical problem that existing strabismus measuring devices require a mirror to be placed 3m in front of the person's eyes when measuring strabismus at a distance of 6m, which limits the widespread use of the measuring instrument. Attached Figure Description
[0026] 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 drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a perspective view of the strabismus measuring instrument disclosed in an embodiment of this utility model;
[0028] Figure 2 This is another perspective view of the strabismus measuring instrument disclosed in this utility model embodiment;
[0029] Figure 3 This is a perspective view of the chin support of the strabismus measuring instrument disclosed in this utility model embodiment;
[0030] Figure 4 This is a partial perspective view of the chin support of the strabismus measuring instrument disclosed in this utility model embodiment;
[0031] Figure 5 This is a partial perspective view of the outer shell of the strabismus measuring instrument with forehead support disclosed in this embodiment of the utility model;
[0032] Figure 6 This is a schematic diagram of the lens group arrangement of the strabismus measuring instrument disclosed in this utility model embodiment;
[0033] Figure 7 This is a schematic diagram illustrating the principle of the lens group of the strabismus measuring instrument disclosed in this embodiment of the present invention to realize the telescope.
[0034] Explanation of reference numerals in the attached figures:
[0035] 1. Upper housing; 2. Lower housing; 3. Measuring window; 4. Chin support; 5. Forehead support; 6. Lifting unit; 7. Support block; 8. Limiting block; 9. Buffer block; 10. Chin support button; 11. Mounting base; 12. Fitting block; 13. Screen; 14. Concave mirror; 15. Convex mirror; 16. Target object; 17. Eye; 18. Power switch; 19. Power socket; 20. Ventilation vent; 21. Foot; 22. Nameplate; 23. Data transmission control port. Detailed Implementation
[0036] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this utility model by way of example, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0037] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0038] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.
[0039] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.
[0040] like Figure 1and Figure 2 As shown, the present invention provides a strabismus measuring instrument, including a housing, a display module, an image capture module, a processing module, and an automatic shading device. The display module, the image capture module, and the automatic shading device are respectively housed in the housing and each is connected to the processing module. The display module is used to display the visual stimulus for the observer to observe. The image capture module is used to record multiple images of at least one eye 17 of the observer observing the visual stimulus. The processing module is used to determine the misalignment of the observer's eye 17 based on the multiple images recorded by the image capture module.
[0041] Compared with the prior art, the strabismus measuring instrument of this utility model, through the screen 13 of the display module, the measuring window 3 of the automatic light shield, and the lens group set between the screen 13 and the measuring window 3, realizes the optical method to pull the near object away to 6m, thereby solving the technical problem that the existing strabismus measuring equipment requires a mirror to be placed 3m in front of the person's eyes when measuring the strabismus degree at a distance of 6m, which limits the popularization and use of the measuring instrument.
[0042] In some embodiments, the housing includes an upper housing 1 and a lower housing 2, wherein the upper housing 1 is located above the lower housing 2 and is detachably connected to the lower housing 2. The upper housing 1 may be referred to as the main unit housing, and the lower housing 2 may be referred to as the main unit base. The housing is divided into upper and lower parts, which facilitates the installation, debugging, and maintenance of the strabismus measuring instrument.
[0043] In some embodiments, an automatic shader is disposed on the upper housing 1 and located at the front end of the upper housing 1. The automatic shader is aligned with the display module. The automatic shader is used to selectively block one or both eyes 17 of the observer during the evaluation process, preventing the blocked eye 17 from observing visual stimuli.
[0044] In some embodiments, the automatic shading device includes a measuring window 3. The measuring window 3 is vertically disposed on the upper housing 1. The measuring window 3 has the characteristics of shielding visible light and selectively high-transmittance (especially in the 800nm-1100nm band) near-infrared light. The measuring window 3 is configured to block the observer's left or right eye respectively according to the control system of the strabismus measuring instrument and the inspection requirements, and can record the movement of the blocked eye 17.
[0045] In some embodiments, the measurement window 3 includes a near-infrared filter. A near-infrared filter is an optical device used to filter near-infrared light, typically in the wavelength range of 780 nm to 1500 nm, including long-pass near-infrared filters and band-pass near-infrared filters.
[0046] In some embodiments, the measuring window 3 includes smart dimming glass. The measuring window 3 is transparent when not powered on, and includes at least two blocking areas when powered on. Smart dimming glass is a photoelectric glass product, primarily based on electrochromic and liquid crystal dimming technologies. Electrochromic technology involves adding electrochromic materials to the glass interlayer; when energized, the optical properties of the material change, thus switching the glass between transparent and opaque states. Liquid crystal dimming technology utilizes the arrangement characteristics of liquid crystal molecules; the orientation of the liquid crystal molecules differs between powered and unpowered states, making the glass appear transparent or opaque. The automatic light shield blocking the observer's eye 17 involves partially or entirely setting the transparent glass of the measuring window 3 as smart dimming glass.
[0047] In some embodiments, a near-infrared light-transmitting electrolyte is added to the middle layer of the smart dimming glass, which can change color when electricity is applied.
[0048] In some embodiments, the automatic shading device includes a control module configured to control the smart dimming glass of the measuring window 3 to automatically adjust the shading area.
[0049] In some embodiments, the smart dimming glass includes multiple intermediate layers, each with a near-infrared light-transmitting electrolyte of varying boundary ranges. This allows the occlusion area to vary in size based on the different facial dimensions, interocular distance, and eye width of different observers. The processing module calculates the corresponding eye occlusion range using a big data model based on the facial dimensions, interocular distance, and eye width information captured by the image capture module. The eye occlusion range can be categorized into several size types. The control module controls the power supply to the corresponding layer according to the required size type while simultaneously turning off the power to other layers.
[0050] In some embodiments, the shape of the occlusion area of the measurement window 3 is customizable. For example, it can be customized according to the observer's gender and age. In particular, for children, occlusion areas with different shapes can be selected to ensure the continuity of the observer's attention during the detection process, so that the detection position remains unchanged for a long time.
[0051] In some embodiments, the measurement window 3 of the automatic occlusion device includes two occlusion areas: a first occlusion area corresponding to the left eye and a second occlusion area corresponding to the right eye. The first and second occlusion areas are opened or closed during the evaluation process according to the automatic occlusion test protocol.
[0052] In some embodiments, the distance between adjacent edges of the first and second blocking areas is 65 mm. The automatic occlusion test protocol corresponding to the automatic occlusion device is as follows: the second blocking area is positioned to cover the right eye for 1 second; the second blocking area is closed within 0.3 seconds and held for 1 second; the second blocking area is opened within 0.3 seconds to cover the right eye and held for 5 seconds, then the second blocking area is closed within 0.3 seconds, the right eye is unblocked, and held for 1 second; this is the first instance of unilateral occlusion of the right eye; the second blocking area is opened within 0.3 seconds to cover the right eye and held for 5 seconds, then the second blocking area is closed within 0.3 seconds, the right eye is unblocked, and held for 1 second; this is the first instance of unilateral occlusion of the right eye. Second time: Open the second occlusion area within 0.3 seconds, cover the right eye, and hold for 5 seconds. Then close the second occlusion area within 0.3 seconds, uncover the right eye, and hold for 1 second. The right eye is now covered on one side. Third time: Open the first occlusion area within 0.3 seconds, cover the left eye, and hold for 5 seconds. Then close the first occlusion area within 0.3 seconds, uncover the left eye, and hold for 1 second. The left eye is now covered on one side. First time: Open the first occlusion area within 0.3 seconds, cover the left eye, and hold for 5 seconds. Then close the first occlusion area within 0.3 seconds, uncover the left eye, and hold for 1 second. s, at this point, the left eye is covered for the second time; within 0.3s, the first occlusion area is opened, covering the left eye and holding for 5s, at this point, the left eye is covered for the third time; within 0.3s, the first occlusion area is closed and the second occlusion area is opened, covering the right eye and holding for 2s, at this point, the right eye is covered alternately for the first time; within 0.3s, the first occlusion area is opened and the second occlusion area is closed, covering the left eye and holding for 2s, at this point, the left eye is covered alternately for the first time; within 0.3s, the first occlusion area is closed and the second occlusion area is opened, covering the right eye and holding for 2s, at this point, the right eye is covered alternately for the first time; The automatic occlusion test protocol is executed as follows: First, within 0.3 seconds, the first occlusion area is opened and the second occlusion area is closed, covering the left eye for 2 seconds. Then, the left eye is alternately covered for the second time. Next, within 0.3 seconds, the first occlusion area is closed and the second occlusion area is opened, covering the right eye for 2 seconds. Then, the right eye is alternately covered for the third time. Finally, within 0.3 seconds, the first occlusion area is closed and the second occlusion area is opened, returning to the initial position where the second occlusion area covers the right eye. The automatic occlusion test protocol is executed under the following conditions: The operator opens the accommodative target program and sends the automatic occlusion test command through the host computer software. After the command is sent, wait 6 seconds before starting the automatic occlusion test protocol. After the command is sent, the host computer software of the image capture module automatically opens and begins video recording.
[0053] In some embodiments, the unilateral occlusion test and the alternating occlusion test are performed sequentially, with the replacement of a monocular visual field occlusion requiring approximately 0.3 seconds. Furthermore, the replacement time for a monocular visual field occlusion is adjustable. The monocular visual field occlusion time is also adjustable. The image capture module captures images of both eyes 17 of the observer, whether the occluded area is covered or not. After activating the eye occlusion function, the control module controls the relevant area position in the smart dimming glass corresponding to the eye 17 that needs to be occluded to complete the color-changing occlusion. The color-changing occluded area has the characteristics of shielding visible light and selectively high-transmittance near-infrared light (especially for the 800nm-1100nm band).
[0054] In some embodiments, the strabismus measuring instrument includes a chin rest 4 and a forehead rest 5, which are respectively disposed on the housing corresponding to the bottom and top ends of the measuring window 3. The chin rest 4 and forehead rest 5 are used to restrict the movement of the observer's head during the evaluation process. When the observer's head is positioned in front of the measuring window 3, the observer's head cooperates with the chin rest 4 and forehead rest 5 to achieve a fixed position that meets the detection requirements.
[0055] In some embodiments, such as Figure 1 As shown, the chin support 4 is located directly in front of the measuring window 3 and is vertically and flexibly fixed to the lower housing 2. Figure 3 As shown, the chin support 4 includes a base and a lifting part 6. The base is located at the top of the lifting part 6, and the bottom end of the lifting part 6 is fixed to the lower housing 2. The base includes an ergonomically designed concave support block 7 that engages with the observer's chin, and a limiting block 8 located at one end of the support block 7 near the measuring window 3 and extending vertically. The lifting part 6 can move up and down relative to the lower housing 2 in the vertical direction, allowing the base to move up and down relative to the measuring window 3.
[0056] In some embodiments, the base includes a buffer block 9, which matches the support block 7 and the limiting block 8. The buffer block 9 is soft and can be made of materials such as silicone or rubber.
[0057] In some embodiments, the chin rest 4 employs a ratchet lifting structure. For example... Figure 3 and Figure 4 As shown, the lifting unit 6 adopts a manual adjustment structure. A chin support button 10 is provided on the lifting unit 6. The principle of the manual adjustment structure is similar to that of the ratchet lifting structure, and will not be described further here. The lifting unit 6 can also use an electric mechanism to achieve the lifting of the lifting unit 6, thereby adjusting the lifting of the base.
[0058] In some embodiments, the chin rest 4 can oscillate in a circular motion within a first swing angle range in the horizontal direction to achieve fine adjustment of the observer's head swaying left and right. For example, the first swing angle range is -10° to +10°.
[0059] In some embodiments, such as Figure 1 and Figure 5 As shown, the forehead support 5 is located at the top center of the measuring window 3, directly above the measuring window 3, and is fixed to the upper housing 1. The forehead support 5 includes a mounting base 11 extending in a direction perpendicular to and away from the measuring window 3, and an adhesive block 12 fixed to the mounting base 11. The adhesive block 12 is concave and arc-shaped, and contacts the observer's forehead.
[0060] In some embodiments, the bonding block 12 is a soft bonding block.
[0061] In some embodiments, the forehead support 5 can slide horizontally relative to the outer shell, and the forehead support 5 can swing left and right within a second swing angle range in a direction perpendicular to the measuring window 3, so as to cooperate with the chin support 4 to achieve fine adjustment of the observer's head swing left and right. For example, the second swing angle range is -10° to +10°.
[0062] In some embodiments, the strabismus measuring device includes a cheekbone support (not shown) disposed on a housing. The shape of the cheekbone support is adapted to the shape of the face. The cheekbone support includes a motor component and a support portion, the shape of which is adapted to the shape of the face. The support portion is connected to the motor component, and the left and right rotation of the support portion is adjusted by the motor component, thereby adjusting the fit of the cheekbone support to the face.
[0063] In some embodiments, there are two cheekbone supports, which are disposed on the upper housing 1 and symmetrically located on both sides of the measuring window 3.
[0064] The combination of chin support 4, forehead support 5, and cheekbone support provides support for the observer's head, limits the detection position and angle of the observer's head, and ensures measurement consistency.
[0065] In some embodiments, the housing, display module, image capture module, automatic shader, chin rest 4, and forehead rest 5 form an integrated assembly.
[0066] In some embodiments, the image capture module is disposed within the upper housing 1 between the display module and the automatic light shield. The image capture module includes at least 2n+1 sets of cameras, where n = 0, 1, 2. The image capture module is used to capture images of the observer's eyes, whether obscured by the occlusion area of the measurement window 3 or not.
[0067] In some embodiments, the image capture module includes a set of cameras positioned in the middle of the upper housing 1, facing the observer and not obstructing the observer's eyes 17. However, the single set of cameras lacks sufficient accuracy in capturing images of the observer's face and eyes. If the observer's head rotates slightly during detection, the single set of cameras, operating at a fixed position and angle, will not clearly capture images of the changing state, affecting detection accuracy; alternatively, a processing module with extremely high computational power may be required for compensation, significantly increasing product cost.
[0068] In some embodiments, the image capture module includes three camera groups, which are respectively positioned at the center of the upper housing 1 and at symmetrical side positions on either side of the center position, each facing the observer and not obstructing the observer's eyes 17. The spacing between adjacent camera groups is the same, and the mounting angles of the two camera groups positioned at the symmetrical side positions on either side of the center position are the same. The elevation angles of the three camera groups are the same.
[0069] In some embodiments, the image capture module includes a first camera group, a second camera group, and a third camera group. The first camera group is positioned at the center of the upper housing 1, and the second and third camera groups are respectively positioned symmetrically on either side of the center position. The distance between the first and second camera groups, and the distance between the first and third camera groups, are both 89 mm. Each of the first, second, and third camera groups faces the observer directly without obstructing the observer's eyes 17. The elevation angle of each camera group is 15°, and the second and third camera groups are each horizontally deflected by 10° towards the direction of the first camera group.
[0070] In some embodiments, the image capture module includes five camera groups, which are respectively positioned at the center of the upper housing 1, symmetrically positioned on either side of the center, and symmetrically positioned at the left and right bottom corners of the measurement window 3. The camera groups positioned at the left and right bottom corners are used to collect facial feature information of the observer. The larger the coverage area of the camera group, the more complete the acquisition of the observer's facial features, and the more accurate the strabismus detection result.
[0071] In some embodiments, the image capture module includes a near-infrared illumination source for illuminating the observer's eye 17.
[0072] In some embodiments, the camera array is fixed in place and captures a panoramic view of the observer's face.
[0073] In some embodiments, the camera group has a fine-tuning structure, which can automatically and intelligently follow the changes in the observation angle of the observer's eye 17 within a certain angle range.
[0074] In some embodiments, the display module includes a screen 13 disposed on the housing. For example, the screen 13 is disposed on the upper housing 1 and located at the rear end of the upper housing 1, and the screen 13 is aligned with the measuring window 3.
[0075] In some embodiments, the strabismus measuring instrument includes a lens assembly disposed within a housing and located between the display module and the automatic shading device. For example, the lens assembly is located between the screen 13 and the measuring window 3. The lens assembly is used to optically zoom out of a nearby object, and the zoom distance can be adjusted by adjusting the lens assembly; that is, the lens assembly achieves the effect of a zoom lens.
[0076] In some embodiments, such as Figure 6 As shown, the lens group includes a concave mirror 14 and a convex mirror 15. The concave mirror 14 and the convex mirror 15 are located between the screen 13 and the measurement window 3. The concave mirror 14 and the convex mirror 15 are arranged parallel and staggered. The mirror surface of the convex mirror 15 faces the screen 13, and the mirror surface of the concave mirror 14 faces the measurement window 3.
[0077] In some embodiments, the target object 16 is displayed on the screen 13, and the target object 16 is centered on the screen 13. The observer is outside the measuring window 3. Therefore, the mirror surface of the convex mirror 15 faces the target object 16, and the mirror surface of the concave mirror 14 faces the observer's eye 17. When the strabismus measuring instrument detects the observer's eye 17, the concave mirror 14 and the convex mirror 15 cannot block the observer from directly observing the target object 16.
[0078] In some embodiments, there is a first distance between the observer's eye 17 and the target 16 at the center of the screen 13, the concave mirror 14 has a first width, and the convex mirror 15 has a second width. When viewed in a direction perpendicular to the concave mirror 14 and the convex mirror 15, the concave mirror 14 and the convex mirror 15 have an overlapping area with a third width. There is a second distance between the center of the concave mirror 14 and the center of the convex mirror 15. There is a vertical distance between the convex mirror 15 and the target 16. There is a third distance between the edge of the concave mirror 14 adjacent to the first inner wall of the housing and the first inner wall of the housing, and a fourth distance between the edge of the convex mirror 15 adjacent to the second inner wall of the housing and the second inner wall of the housing.
[0079] In some embodiments, the first distance between the observer's eye 17 and the target object 16 at the center of the screen 13 is 330 mm, the first width of the concave mirror 14 is 150 mm, and the second width of the convex mirror 15 is 150 mm. The third width of the overlapping area of the concave mirror 14 and the convex mirror 15 is 50 mm. The second distance between the center of the concave mirror 14 and the center of the convex mirror 15 is 150 mm, the vertical distance between the convex mirror 15 and the target object 16 is 290 mm, the third distance between the edge of the concave mirror 14 adjacent to the first inner wall of the housing and the first inner wall of the housing is 100 mm, and the fourth distance between the edge of the convex mirror 15 adjacent to the second inner wall of the housing and the second inner wall of the housing is 100 mm. This design ensures that when close observation is required, the observer only needs to directly look at the target object 16 at the center of the screen 13; when distant observation is required, the observer only needs to directly look at the second virtual image of the target object 16 in the concave mirror 14, achieving an observation effect of 6 meters. That is, the target object 16 is optically extended to 6 meters.
[0080] like Figure 7 As shown, the principle of the lens group realizing the telephoto lens is as follows: the target object 16 is reflected for the first time by the convex mirror 15, and the extension of the reflected light rays from the first reflection forms a reduced first virtual image behind the convex mirror 15; the reflected light rays from the first reflection by the convex mirror 15 are then reflected for the second time by the concave mirror 14, and the extension of the reflected light rays from the second reflection forms a magnified and telephotoned second virtual image behind the concave mirror 14. The relevant calculation formula is:
[0081] Concave mirror imaging formula: +
[0082] Convex mirror imaging formula: ,
[0083] Virtual image distance formula:
[0084] Magnification formula: A
[0085] in, Focal length of a concave mirror =325mm;
[0086] Focal length of a convex mirror =325mm;
[0087] x: Object distance, the distance between the target object and the convex mirror;
[0088] y: Distance between the centers of the concave mirror and the convex mirror, y = 150 mm;
[0089] Increase the distance;
[0090] : Convex mirror imaging distance;
[0091] A: Magnification.
[0092] When the object distance x is 28.9cm, the distance is increased. The distance is 6 meters, and the magnification A is 13.7. The zoom distance is adjusted by adjusting the object distance x. This allows for obtaining different distances. The demand.
[0093] In some embodiments, when the lens group includes a concave mirror 14 and a convex mirror 15, the distance by which the target 16 is pulled away can be adjusted by adjusting the vertical distance between the convex mirror 15 of the lens group and the target 16 at the center of the screen 13.
[0094] In some embodiments, the strabismus measuring instrument includes a power module disposed within the lower housing 2 for providing power. Figure 2 As shown, a power switch 18 and a power socket 19 are provided on the lower housing 2. The power switch 18 and the power socket 19 are used for the power module.
[0095] In some embodiments, such as Figure 1 As shown, the lower housing 2 is provided with a vent 20 and a foot 21. The vent 20 is located on the side of the lower housing 2 for ventilation inside the lower housing 2, and the foot 21 is located at the bottom of the lower housing 2 for supporting the lower housing 2. In addition, a nameplate 22 is provided on the lower housing 2. In some embodiments, a data transmission control port 23 is provided on the upper housing 1. The data transmission control port 23 is used for data transmission between the display module, the image capture module, and the automatic light shield.
[0096] In some embodiments, the strabismus measuring instrument includes a filter module, a hub, and a control circuit. The filter module, hub, and control circuit are disposed in the lower housing 2. The connection with the above-mentioned related components is conventional technology in the art and will not be described here.
[0097] The strabismus measuring instrument provided by this utility model has an automatic shading device that can selectively block one or both eyes 17 of the observer, preventing the blocked eye 17 from observing the visual stimulus displayed by the display module. The image capture module can record multiple images of at least one eye 17 of the observer observing the visual stimulus. The processing module can determine the misalignment of the observer's eye 17 based on the multiple images recorded by the image capture module. The lens group can optically pull nearby objects further away, solving the technical problem that existing strabismus measuring devices require a mirror to be placed 3m in front of the person's eyes when measuring strabismus at a distance of 6m, which limits the widespread use of the measuring instrument.
[0098] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.
[0099] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.
Claims
1. A strabismus measuring instrument, characterized in that, include: The display module is used to display visual stimuli for the observer to observe; An automatic shading device is provided and aligned with the display module. The automatic shading device is used to selectively block one or both eyes (17) of the observer so that the blocked eye (17) cannot observe the visual stimulus. An image capture module is used to record multiple images of at least one eye (17) of the observer observing the visual stimulus, the image capture module being disposed between the display module and the automatic shading device; The processing module is used to determine the misalignment of the observer's eye (17) based on multiple images recorded by the image capture module; A lens group, used to optically zoom out of nearby objects, is disposed between the display module and the automatic sunshade; The display module, image capture module, automatic shading device, and lens group are respectively housed within the housing, and the display module, image capture module, and automatic shading device are respectively connected to the processing module.
2. The strabismus measuring instrument according to claim 1, characterized in that, The outer casing includes an upper casing (1) and a lower casing (2), wherein the upper casing (1) is located above the lower casing (2) and is detachably connected to the lower casing (2).
3. The strabismus measuring instrument according to claim 2, characterized in that, The automatic shading device is disposed on the upper housing (1) and located at the front end of the upper housing (1). The automatic shading device includes a measuring window (3). The display module includes a screen (13) which is aligned with the measuring window (3).
4. The strabismus measuring instrument according to claim 3, characterized in that, The measuring window (3) includes smart dimming glass, which is transparent for observation when not powered on and includes at least two shielding areas when powered on.
5. The strabismus measuring instrument according to claim 4, characterized in that, The shape of the shading area of the measuring window (3) is designable; the automatic shading device includes a control module configured to control the smart dimming glass of the measuring window (3) to automatically adjust the shading area.
6. The strabismus measuring instrument according to claim 1, characterized in that, The strabismus measuring instrument includes a chin rest (4) and a forehead rest (5), which are disposed on the housing and are used to restrict the movement of the observer's head.
7. The strabismus measuring instrument according to claim 1, characterized in that, The image capture module includes at least one set of cameras; the image capture module includes a near-infrared illumination source.
8. The strabismus measuring instrument according to claim 7, characterized in that, The camera group has a fine-tuning structure, and the camera group can automatically and intelligently follow the changes in the observation angle of the observer's eye (17) within a certain angle range.
9. The strabismus measuring instrument according to claim 3, characterized in that, The lens group includes a concave mirror (14) and a convex mirror (15). The concave mirror (14) and the convex mirror (15) are located between the screen (13) and the measuring window (3). The concave mirror (14) and the convex mirror (15) are arranged parallel and staggered. The mirror surface of the convex mirror (15) faces the screen (13), and the mirror surface of the concave mirror (14) faces the measuring window (3). When viewed in a direction perpendicular to the concave mirror (14) and the convex mirror (15), the concave mirror (14) and the convex mirror (15) have an overlapping area.
10. The strabismus measuring instrument according to claim 9, characterized in that, The first distance between the observer's eye (17) and the target (16) at the center of the screen (13) is 330 mm. The first width of the concave mirror (14) is 150 mm. The second width of the convex mirror (15) is 150 mm. The third width of the overlapping area of the concave mirror (14) and the convex mirror (15) is 50 mm. The second distance between the center of the concave mirror (14) and the center of the convex mirror (15) is 150 mm. The vertical distance between the convex mirror (15) and the target (16) is 290 mm. The third distance between the edge of the concave mirror (14) adjacent to the first inner wall of the outer shell and the first inner wall of the outer shell is 100 mm. The fourth distance between the edge of the convex mirror (15) adjacent to the second inner wall of the outer shell and the second inner wall of the outer shell is 100 mm.