A visual function testing device

Abstract

This utility model relates to a visual function testing device, including a housing, a mounting plate, an optomechanical module, an optical lens assembly, a transmission device, a frame fixing panel, and a magnetic frame. The frame fixing panel has at least two lens holders for holding fixed lenses. A light-blocking structure is provided on the mounting plate near the fixed lenses. The optomechanical module is fixedly connected to the transmission device. The transmission device includes a first transmission module, a second transmission module, and a third transmission module. The magnetic frame is attached to the frame fixing panel and is used to hold the optical lens assembly. It has the following advantages: by installing a +5 diopter convex lens at the front end of the optomechanical module to simulate infinity accommodation, and controlling the movement distance of the optomechanical module via a control panel and combining different lenses to meet different visual function testing needs, the assessment of visual function is more comprehensive.

Description

Technical Field

[0001] This utility model relates to the field of optometry technology, and more specifically, to a visual function testing device. Background Technology

[0002] Traditional visual function tests rely heavily on professionals, and their accuracy depends largely on the optometrist's expertise, resulting in significant labor costs. Advances in technology and the advent of intelligent systems have offered solutions to these problems. While some have attempted to change this traditional approach by using a comprehensive phoropter system for visual function testing, the cumbersome and time-consuming nature of the procedure limits its efficiency. Furthermore, using trial lenses with 0.25D intervals to measure accommodative response and relative accommodation makes it difficult to achieve optimal target clarity, affecting the accuracy of the results. Common visual function tests, such as convergence near point, convergence sensitivity, accommodation sensitivity, and the approach method for measuring accommodative amplitude, cannot be performed by the comprehensive phoropter system, requiring handheld testing equipment and increasing costs.

[0003] This application is applicable to the accurate assessment and personalized rehabilitation treatment of visual function disorders such as amblyopia, myopia, and strabismus. It also integrates traditional visual function tests, such as visual acuity testing, color vision assessment, four-hole lamp test, stereopsis test, unequal image analysis, perceptual crowding assessment, near and far eye position measurement (horizontal / vertical), convergence / divergence ability test, contrast sensitivity test, Amsler table screening, and accommodation function tests (NRA, BCC, PRA, AMP, AC / A), providing a comprehensive visual function assessment. Utility Model Content

[0004] Based on the technical problems existing in the background art, this utility model proposes a visual function inspection device.

[0005] The present invention provides a visual function testing device, comprising a housing, a mounting plate, an optomechanical module, an optical lens assembly, a transmission device, a frame fixing panel, and a magnetic frame.

[0006] The frame fixing panel is located at one end of the outer shell and is fixedly connected to the outer shell;

[0007] The frame fixing panel is provided with at least two lens fixing brackets for placing lens fixing brackets; the lens fixing brackets are movably located on one side of the frame fixing panel.

[0008] A light-shielding structure is provided on the mounting plate near the fixed lens, and the light-shielding structure is located between the optical engine module and the fixed lens bracket;

[0009] The optomechanical module is fixedly connected to the transmission device and is respectively disposed on the mounting plate, which is fixedly disposed inside the housing;

[0010] The transmission device includes a first transmission module, a second transmission module, and a third transmission module; the first transmission module is fixedly connected to the optomechanical module; the second transmission module is movably connected to the fixed lens bracket; and the third transmission module is movably connected to the light-shielding structure.

[0011] The magnetic eyeglass frame is attached to the eyeglass frame fixing panel and is used to hold the optical lens assembly.

[0012] Furthermore, the optical lens assembly includes positive spherical lenses, negative spherical lenses, cross cylindrical lenses, rotating prisms, or auxiliary lenses to meet different inspection needs;

[0013] The light-shielding structure includes a light-shielding bracket, a left frame, and a right frame; the left frame and the right frame are movably mounted on the light-shielding bracket, and the light-shielding bracket is provided with several partitions. The left frame and the right frame are movably connected to the partitions and can move in the horizontal direction to adjust the field of vision of both eyes.

[0014] Furthermore, the optical engine module, the lens frame fixing panel, and the light-shielding bracket are each provided with a number of guide rods;

[0015] The guide rods of the optical-mechanical model are located on the left and right sides of the optical-mechanical model;

[0016] The left and right frames are respectively provided with a first connecting block, a limiting block and a first slider. The limiting block and the first slider are respectively movably mounted on different guide rods on the light-shielding bracket. The first connecting block is fixedly connected to the third transmission module.

[0017] The lens holder is provided with a second connecting block and a second slider, which are respectively located on different guide rods on the frame fixing panel.

[0018] Furthermore, the first transmission module includes a first driver, a drive belt, and a fixing block. One end of the drive belt is connected to the first driver to drive the drive belt to rotate. The fixing block is fixedly connected to the optomechanical module and the drive belt respectively, so as to realize that the drive belt drives the optomechanical module to move.

[0019] The second transmission module includes a second drive rod and a second driver. One end of the second connecting block is movably connected to the second drive rod, and the other end is movably connected to the guide rod on the frame fixing panel. One end of the second drive rod is connected to the second driver for driving the second drive rod to move.

[0020] The third transmission module includes a third drive rod and a drive block. One end of the drive block is movably connected to the third drive rod, and the other end is fixedly connected to the first connecting block. One end of the third drive rod is connected to the first driver to drive the third drive rod to move.

[0021] The optical engine module includes a frame, a display module, and a viewing window. The display module is mounted on the frame, and the viewing window is vertically mounted on the mounting plate.

[0022] One end of the mounting plate is equipped with a control panel, which is electrically connected to the optomechanical module and the transmission device respectively.

[0023] The beneficial effects of this invention are as follows: By installing a +5 diopter convex lens at the front end of the optical engine module, it simulates the accommodation requirements at infinity. When the optical engine module moves to the 200mm position, it is equivalent to "pulling" the optical infinity point closer to 20cm, with the object precisely at the focal point of the convex lens. The optical engine module then emits parallel light, simulating the state of the eye looking at infinity. The optical engine module's movement range is 133-200mm, corresponding to accommodation stimuli from 0D to 2.5D, covering the clinically common 40cm near-field examination requirements. Adjusting the transmission device via the control panel reduces the ±0.25D lens stacking error caused by manual adjustments, ensuring the repeatability and accuracy of the adjustment test results. The magnetic frame can be attached to the frame fixing panel of the outer shell. Different lenses can be placed on the magnetic frame for different tests, retaining the flexibility of traditional lens replacement while simplifying the tedious process of manual lens changing. The control panel controls the movement distance of the optical module to achieve the testing of different items, and the different lenses of the optical lens assembly can meet the visual function examination needs of different requirements, making the evaluation of visual function more comprehensive. Attached Figure Description

[0024] Figure 1 This is an exploded view of a visual function testing device according to one embodiment of the present invention;

[0025] Figure 2 This is an exploded view of a visual function testing device from another perspective in one embodiment of this utility model;

[0026] Figure 3 This is a perspective view of the optomechanical module of a visual function testing device according to one embodiment of the present invention;

[0027] Figure 4 This is a perspective view of the transmission device of a visual function inspection device according to an embodiment of the present invention;

[0028] Figure 5This is a perspective view of the light-shielding structure of a visual function testing device according to an embodiment of the present invention;

[0029] Figure 6 This is a perspective view of the eyeglass frame fixing panel of a vision function testing device according to one embodiment of the present invention;

[0030] Figure 7 This is a perspective view of the frame fixing panel of a vision function testing device according to one embodiment of the present invention from another angle.

[0031] Figure 8 This is an assembly diagram of a visual function inspection device according to one embodiment of the present invention;

[0032] Figure 9 This is an assembly diagram of another embodiment of a visual function inspection device according to one embodiment of the present invention.

[0033] Labeling explanation: Outer shell 1,

[0034] Mounting plate 2, light-shielding structure 21, light-shielding bracket 211, partition 212, left frame 213, right frame 214, first connecting block 215, limiting block 216, first slider 217.

[0035] The frame fixing panel 3, the lens fixing bracket 31, the second connecting block 311, the second slider 312, and the lens fixing 32;

[0036] Optical engine module 4, frame 41, display module 42, viewing window 43;

[0037] Optical lens assembly 5;

[0038] Transmission device 6, first transmission module 61, first driver 611, drive belt 612, fixed block 613; second transmission module 62, second drive rod 621, second driver 622; third transmission module 63, third drive rod 631, drive block 632.

[0039] 7. Magnetic frame, 8. Guide rod, 9. Control panel. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] Please refer to the attached document. Figures 1-9This utility model proposes a visual function testing device, including a housing 1, a mounting plate 2, an optomechanical module 4, an optical lens assembly 5, a transmission device 6, a frame fixing panel 3, and a magnetic frame 7; the frame fixing panel 3 is located at one end of the housing 1 and is fixedly connected to the housing 1; the frame fixing panel 3 is provided with at least two lens fixing supports 31 for placing lens fixings 32; the lens fixing supports 31 are movably located on one side of the frame fixing panel 3; a light-shielding structure 21 is provided on the mounting plate 2 near the lens fixing 32, and the light-shielding structure 21 is located in the optomechanical module. The optical engine module 4 is fixedly connected to the transmission device 6 and is respectively mounted on the mounting plate 2, which is fixedly mounted inside the housing 1. The transmission device 6 includes a first transmission module 61, a second transmission module 62 and a third transmission module 63. The first transmission module 61 is fixedly connected to the optical engine module 4. The second transmission module 62 is movably connected to the fixed lens holder 31. The third transmission module 63 is movably connected to the light-shielding structure 21. The magnetic lens holder 7 is attached to the lens holder fixing panel 3 and is used to place the optical lens assembly 5.

[0042] In this embodiment, the optical engine module 4 and the transmission device 6 are respectively mounted on the mounting plate 2, which is fixedly installed inside the outer casing 1. The frame fixing panel 3 is fixedly installed at one end of the outer casing 1, and the frame fixing panel 3 has a viewing hole. The magnetic frame 7 is attached to the frame fixing panel 3, and the optical lens assembly 5 is specifically installed on the magnetic frame 7, with the optical lens assembly 5 corresponding to the viewing hole on the frame fixing panel 3. A fixed lens 32 is provided at the front end of the optical engine module 4 (i.e., the end near the frame fixing panel 3). The fixed lens 32 is specifically installed on the side of the frame fixing panel 3 near the optical engine module 4. A fixed lens bracket 31 is installed on the frame fixing panel 3 to hold the fixed lens 32 and to align the fixed lens 32 with the viewing hole on the frame fixing panel 3. The fixed lens 32 is specifically a 5D convex lens, used to simulate the adjustment requirements of infinity. This is equivalent to "bringing" the optical infinity point closer to 20cm. When the optical engine module 4 moves to the 200mm position, the object is exactly at the focal point of the convex lens, and the optical engine module 4 generates parallel light emission, simulating the state of the eye looking at infinity. The movement range of the optical engine module 4 is specifically 133-200mm, corresponding to 0D to 2.5D accommodative stimulation, which covers the clinically commonly used 40cm near-field examination requirements. Through the adjustment of the transmission device 6, the optical engine module 4's movement distance is adjusted via the control panel, reducing the ±0.25D lens superposition error caused by manual adjustments and ensuring the repeatability and accuracy of the accommodative test results. The magnetic frame 7 is equipped with magnetic components, and the frame fixing panel 3 also has magnetic components with opposite magnetic properties to those on the magnetic frame 7. When the magnetic frame 7 is close to the frame fixing panel 3 of the outer shell 1, the magnetic frame 7 can quickly attach to the frame fixing panel 3, retaining the flexibility of traditional lens replacement and allowing for quick switching between different magnetic frames 7 via the magnetic interface, simplifying the tedious manual replacement process.

[0043] The relationship between the distance the optical engine moves and the accommodation of the eye is as follows: Where D is the diopter and N is the object distance from the optical engine module 4 to the eye.

[0044] The object distance N is changed by moving the optical engine module 4. When the optical engine module 4 moves away from the lens, the object distance N increases, and the accommodative stimulus D decreases; when the optical engine module 4 moves closer to the lens, the object distance N decreases, and the accommodative stimulus D increases. In traditional visual function testing modes, optometrists need to manually change lenses repeatedly to perform different tests during NRA / PRA examinations. Now, by controlling the movement of the optical engine module 4 via the control panel 9, different tests can be performed, greatly reducing the number of manual steps.

[0045] The light-blocking structure 21 effectively blocks ambient stray light or scattered light from the internal cavity of the optomechanical module 4, ensuring that only the image (target visual object) from the optomechanical module 4 enters the subject's eyes. When performing accommodation tests such as NRA, PRA, BCC, and AMP, the subject is required to be highly sensitive to changes in blur or sharpness. The light-blocking treatment can significantly improve image contrast and avoid background interference, ensuring that the subject's visual axis, the imaging axis of the optomechanical module 4, and the optical center of the lens are "tri-axis coincident".

[0046] In another embodiment, the optical engine module 4 is moved to a position 40cm away (i.e., an object distance of 133mm, corresponding to a 2.5D adjustment requirement). The position of the optical engine module 4 can be directly moved, replacing manual lens replacement. Moving the optical engine away from the lens increases negative accommodation stimulation (equivalent to superimposing a negative lens), while moving it closer to the lens increases positive accommodation stimulation (equivalent to superimposing a positive lens).

[0047] Please refer to Figure 1 , Figure 2 and Figure 8 The optical lens assembly 5 includes a positive spherical lens, a negative spherical lens, a cross cylindrical lens, a rotating prism, and an auxiliary lens. Different lenses in the optical lens assembly 5 can meet different examination needs.

[0048] In practical implementation: Different lenses in the optical lens assembly 5 can meet the visual function examination needs of different requirements. These visual function examinations include, but are not limited to, visual acuity tests, accommodative function tests (such as: accommodative flexibility tests, accommodative response tests, accommodative amplitude tests, positive and negative relative accommodation tests, AC / A tests, etc.), three-level visual function tests (synoptophore tests, Worth's 4-point tests, eye position tests, positive and negative fusion convergence range tests, convergence flexibility tests, stereopsis tests, etc.), central fixation tests, contrast sensitivity tests, color vision tests, eye movement tests, and reading ability tests. The accommodative system function can be comprehensively evaluated from different perspectives (such as amplitude, flexibility, linkage balance, and actual response).

[0049] In one embodiment, a magnetic suction element is provided on the housing 1 of the testing device. The magnetic suction element attracts a magnetically attached lens frame 7 with opposite magnetism to the housing 1. The magnetically attached lens frame 7 can be used to place different lenses to meet different visual function tests. The movement distance of the optomechanical module 4 inside the housing 1 is adjusted by the control panel 9 to perform adjustment flexibility test, adjustment response test, adjustment amplitude test, positive and negative relative adjustment test, AC / A test, and thus evaluate the function of the adjustment system.

[0050] In another embodiment, the magnetic eyeglass frame 7 includes a lens turntable, with lenses arranged diagonally relative to the turntable, aligning the diagonally arranged lenses with the viewing holes on the frame fixing panel 3. Specifically, the magnetic eyeglass frame 7 includes a controller, which is electrically connected to the control panel 9 inside the housing 1. The controller is fixedly connected to the lens turntable, allowing the control panel 9 to drive the controller to rotate the lens turntable. Specifically, the control panel 9 drives the controller to rotate the lens turntable at different angles, resulting in a different set of lenses after rotating +90° or -90°, each corresponding to a viewing hole on the frame fixing panel 3.

[0051] Please refer to Figure 4 and Figure 5 The light-shielding structure 21 includes a light-shielding bracket 211, a left frame 213, and a right frame 214. The left frame 213 and the right frame 214 are movably mounted on the light-shielding bracket 211. The light-shielding bracket 211 is provided with several partitions 212. The left frame 213 and the right frame 214 are movably connected to the partitions 212 and can move in the horizontal direction to adjust the field of vision of the eyes.

[0052] In practical implementation: The light-shielding structure 21 includes a light-shielding bracket 211, a left frame 213, and a right frame 214. The light-shielding structure 21 is specifically located between the frame fixing panel 3 and the optical engine module 4, and is positioned close to the frame fixing panel 3. The left frame 213 and the right frame 214 of the light-shielding structure 21 correspond to the positions of the peepholes on the frame fixing panel 3, respectively. Specifically, the light-shielding bracket 211 is fixedly mounted on the mounting plate 2, and the light-shielding bracket 211 is provided with several partitions 212. The left frame 213 and the right frame 214 are movably connected to the partitions 212, which are used to block ambient light or scattered light from the optical engine module 4 from entering the subject's eyes, ensuring that only the visual target from the optical engine module 4 is imaged, thereby improving contrast sensitivity and detection accuracy.

[0053] Please refer to Figure 2 and Figures 4-6 The optical engine module 4, the frame fixing panel 3, and the light shield bracket 211 are each provided with a number of guide rods 8; the guide rods 8 of the optical engine module are located on the left and right sides of the optical engine module; the left frame 213 and the right frame 214 are respectively provided with a first connecting block 215, a limiting block 216, and a first slider 217, the limiting block 216 and the first slider 217 are respectively movably mounted on different guide rods 8 on the light shield bracket 211, and the first connecting block 215 is fixedly connected to the third transmission module 63; the fixed lens bracket 31 is respectively provided with a second connecting block 311 and a second slider 312, the second connecting block 311 and the second slider 312 are respectively mounted on different guide rods 8 on the frame fixing panel 3.

[0054] In specific implementation: the first transmission module 61 includes a first driver 611, a drive belt 612 and a fixing block 613. The first transmission module 61 is fixedly connected to the optical engine module 4 through the fixing block 613. The left and right sides of the optical engine module 4 are respectively provided with guide rods 8, and the optical engine module 4 is movably connected to the guide rods 8. When the first transmission module 61 drives the optical engine module 4 to move, the optical engine module 4 moves along the preset track of the guide rods 8, so that the optical engine module 4 moves towards or away from the frame fixing panel 3.

[0055] The frame fixing panel 3 is provided with several guide rods 8, and the lens fixing bracket 31 is provided with a second connecting block 311 and a second slider 312. The lens fixing bracket 31 is connected to the guide rods 8 of the frame fixing panel 3 via the second connecting block 311 and the second slider 312. Specifically, the second connecting block 311 is located above the lens fixing bracket 31, and the second slider 312 is located below the lens fixing bracket 31. One end of the second connecting block 311 is movably connected to the corresponding guide rod 8 above the lens fixing bracket 31, and the other end is movably connected to the second transmission module 62. The second slider 312 is movably connected to the corresponding guide rod 8 below the lens fixing bracket 31. Driven by the second transmission module 62, the lens fixing bracket 31 can move left and right, thereby adjusting the distance between the lens fixing brackets 31 to accommodate different interpupillary distances of the test subjects. At the same time, the second slider 312 also serves as a limit to prevent excessive movement of the lens fixing bracket 31, which could cause misalignment between the lens fixing bracket 31 and the peephole on the frame fixing panel 3 and affect the test subject's field of vision.

[0056] The guide rods 8 of the light-shielding bracket 211 are respectively located on the upper and lower sides of the left frame 213 and the right frame 214. The left frame 213 and the right frame 214 are respectively provided with a first connecting block 215, a limiting block 216 and a first slider 217. The limiting block 216 and the first slider 217 are respectively movably mounted on different guide rods 8 on the light-shielding bracket 211. Specifically, the limiting block 216 and the first connecting block 215 are respectively located below the left frame 213 and the right frame 214, and the limiting block 216 and the first connecting block 215 are respectively movably connected to the corresponding guide rods 8 below the left frame 213 and the right frame 214. The first connecting block 215 is also fixedly connected to the third transmission module 63. The first slider 217 is respectively located above the left frame 213 and the right frame 214, and is respectively movably connected to the corresponding guide rods 8 above the left frame 213 and the right frame 214. Driven by the third transmission module 63, the left frame 213 and the right frame 214 can move left and right respectively to ensure that the target seen by the subject through the left frame 213 and the right frame 214 is a valid and clear image.

[0057] Please refer to Figure 1 and Figure 4The first transmission module 61 includes a first driver 611, a drive belt 612 and a fixing block 613. One end of the drive belt 612 is connected to the first driver 611 to drive the drive belt 612 to rotate. The fixing block 613 is fixedly connected to the optical engine module 4 and the drive belt 612 respectively, so as to realize that the drive belt 612 drives the optical engine module 4 to move.

[0058] In specific implementation: the first transmission module 61 is fixedly connected to the optomechanical module 4. The first transmission module 61 includes a first driver 611, a drive belt 612, and a fixing block 613. One part of the fixing block 613 of the first transmission module 61 is fixedly connected to the optomechanical module 4, and the other part is fixedly connected to the drive belt 612. One end of the drive belt 612 is connected to the first driver 611, so that the first driver 611 can drive the optomechanical module 4 to move through the drive belt 612.

[0059] Please refer to Figure 4 and Figure 6 The second transmission module 62 includes a second drive rod 621 and a second driver 622. One end of the second connecting block 311 is movably connected to the second drive rod 621, and the other end is movably connected to the guide rod 8 on the frame fixing panel 3. One end of the second drive rod 621 is connected to the second driver 622 to drive the second drive rod 621 to move.

[0060] In specific implementation: the second transmission module 62 is located on the frame fixing panel 3. The second transmission module 62 includes a second drive rod 621 and a second driver 622. The second drive rod 621 is connected to the second driver 622 and is movably connected to the fixed lens bracket 31. When the second driver 622 drives the second drive rod 621 to move, the second drive rod 621 can drive the fixed lens bracket 31 to move left and right in the horizontal direction.

[0061] Please refer to Figure 4 and Figure 5 The third transmission module 63 includes a third drive rod 631 and a drive block 632. One end of the drive block 632 is movably connected to the third drive rod 631, and the other end is fixedly connected to the first connecting block 215. One end of the third drive rod 631 is connected to the first driver 611 to drive the third drive rod 631 to move.

[0062] In specific implementation: the third transmission module 63 is connected to the left frame 213 and the right frame 214 on the light-shielding bracket 211 respectively. The third transmission module 63 includes a third drive rod 631 and a drive block 632. The third transmission module 63 is fixedly connected to the left frame 213 and the right frame 214 respectively through the drive block 632. Specifically, one end of the drive block 632 is fixedly connected to the first connecting block 215, and the other end is movably connected to the third drive rod 631. One end of the third drive rod 631 is electrically connected to the first driver 611, and the third drive rod 631 is driven to move through the first driver 611, so as to drive the left frame 213 and the right frame 214 to move left and right. The first driver 611 is electrically connected to the drive belt 612 of the first transmission module 61 and the third drive rod 631 of the third transmission module 63, respectively, so as to realize that when the optical engine module 4 moves towards or away from the frame fixing panel 3, it drives the left frame 213 and right frame 214 on the light shield bracket 211 to move left and right, thereby ensuring that when the subject looks at the visual target of the viewing window surface 43 through the light shield structure 21, the images seen by the left and right eyes are clear and effective.

[0063] Please refer to Figure 1 and Figure 3 The optical engine module 4 includes a frame 41, a display module 42 and a viewing window 43. The display module 42 is mounted on the frame 41, and the viewing window 43 is mounted vertically on the mounting plate 2.

[0064] In practical implementation: the optical engine module 4 is located inside the housing 1, specifically on the mounting plate 2 inside the housing 1. The optical engine module 4 includes a frame 41, a display module 42, and a viewing window 43. Specifically, the viewing window 43 is perpendicular to the mounting plate 2 and located on the frame 41 near the frame fixing panel 3. The display module 42 is located on the frame 41 and includes a first display screen and a second display screen. The first display screen is parallel to the mounting plate 2, and the second display screen is perpendicular to the mounting plate 2. The first and second display screens are located on different surfaces of the frame 41. Each of the first and second display screens has a driving component, which is electrically connected to the control panel 9 on the mounting plate 2. The control panel 9 drives the driving components to move the first and second display screens left and right. The synchronous adjustment range of the screen spacing between the first and second display screens is between 40-70mm to accommodate different interpupillary distances of subjects, covering the interpupillary distance range from children to adults. Adjustment via the control panel 9 reduces the error of manual adjustment.

[0065] Please refer to Figure 1 and Figure 2 One end of the mounting plate 2 is equipped with a control panel 9, which is electrically connected to the optomechanical module 4 and the transmission device 6 respectively.

[0066] In practice: the control panel 9 establishes an electrical connection with the optical engine module 4 and the transmission device 6 respectively. The control panel 9 drives the transmission device 6 to move, thereby adjusting the moving distance of the optical engine module 4 and the distance between the fixed lens 32 and the light-shielding structure 21 to adapt to the pupillary distance of the subject, so as to conduct different visual function tests. Among them, the visual function tests include, but are not limited to, visual acuity tests, accommodative function tests (such as: accommodative flexibility tests, accommodative response tests, accommodative amplitude tests, positive and negative relative accommodation tests, etc.), AC / A tests, three-level visual function tests (synoptophore tests, Worth 4 points, eye position tests, positive and negative fusion convergence range tests, convergence flexibility tests, stereopsis tests, etc.), central fixation tests, contrast sensitivity tests, color vision tests, eye movement tests, and reading ability tests.

[0067] Specifically, a 5D convex lens is fixedly installed at the front end of the outer shell 1 (i.e., the end near the frame fixing panel 3) to simulate the eye's accommodation needs at infinity. The optomechanical module 4 works in conjunction with the 5D convex lens to simulate an infinity distance, at which point the eye's accommodation needs are 0D.

[0068] In one embodiment, the relationship between the object distance from the optical engine module 4 to the eye and the eye's accommodation is as follows: D represents diopter, and N represents the object distance from the optical engine module 4 to the eye, in meters. The horizontal movement range of the optical engine module 4 is between 133mm and 200mm. The optical engine module 4 is fixedly connected to the transmission device 6, which in turn drives the optical engine module 4 to move within the 133mm-200mm range. The optical engine movement distance is compensated for by the reciprocal of the object distance; the closer the object distance, the larger the reciprocal of the object distance. Subtracting the 5D fixed at the front end of the outer shell 1 (i.e., the end closest to the frame fixing panel 3) gives the amount of accommodation required by the eye. The closer the object distance, the larger the reciprocal of the object distance, and the greater the amount of accommodation required by the eye; the farther the object distance, the smaller the reciprocal of the object distance, and the smaller the amount of accommodation required by the eye.

[0069] In one embodiment, the optical engine module 4 is moved to a position of 200mm (i.e., 0.2m), based on the relationship between the optical engine movement distance and the eye's accommodation. Thus obtain At this time, the optical engine module 4 is used in conjunction with the 5D convex lens (i.e., fixed lens) to simulate an infinite distance. When the optical engine module 4 is at a distance of 200mm (i.e. 0.2m), the eye's accommodation requirement is 0D.

[0070] The optical engine module 4 is moved to 133mm (0.133m), based on the relationship between the optical engine's movement distance and the eye's accommodation. get When the optical engine module 4 is used in conjunction with the 5D convex lens, it simulates a distance of 40cm. When the optical engine module 4 is at 133mm (i.e. 0.133m), the eye's accommodation requirement is 2.5D.

[0071] A magnetic eyeglass frame 7 is installed on the frame fixing panel 3 of the outer casing 1 to facilitate functional inspections for different needs. The magnetic eyeglass frame 7 is magnetically attached to the frame fixing panel 3 of the outer casing 1. This makes changing different lenses or the magnetic eyeglass frame 7 more convenient during different functional inspections, avoiding the cumbersome lens replacement process. The magnetic eyeglass frame 7 is mainly used to hold the optical lens assembly 5, which includes, but is not limited to, positive spherical lenses, negative spherical lenses, cross cylindrical lenses, rotating prisms, and auxiliary lenses, depending on the specific lens requirements. Specifically, the magnetic eyeglass frame 7 is provided with slots for movable lenses and slots for fixed lenses 32; the slots for movable lenses can be used to place lenses of different refractive powers for AMP (Amplitude of Accommodation) testing, and the slots for fixed lenses 32 can be used to place positive spherical lenses, negative spherical lenses, and cross cylindrical lenses for testing NRA (Negative Relative Accommodation), PRA (Positive Relative Accommodation), AMP (Amplitude of Accommodation), and BCC (Binocular Cross Cylinder) tests.

[0072] The optical engine module 4 is fixedly connected to the transmission device 6, and the transmission device 6 is electrically connected to the control panel 9 located on the mounting plate 2. The object distance is adjusted by moving the optical engine module 4 via the control panel 9, replacing traditional manual lens changing. The optometrist can perform different tests according to the patient's needs through the control panel 9. These tests include, but are not limited to, NRA (Negative Relative Accommodation), PRA (Positive Relative Accommodation), AMP (Amplitude of Accommodation), BCC (Binocular Cross Cylinder), and AC / A ratio (Accommodative Convergence / Accommodation ratio). The control panel 9 acquires and records the test results.

[0073] In one embodiment, the step of testing the eye's ability to relax and adjust via NRA includes attaching a magnetic frame 7 with positive spherical lenses to the frame fixing panel 3, resetting the display module 42 to both sides of the optical engine module 4 via the control panel 9, moving the optical engine module 4 from a first position to a third position, and judging whether the visual target is clear by the eyes.

[0074] If so, continue moving the optical engine module 4 to the third position until the target becomes blurry and unrecognizable;

[0075] If not, record the number of times the optical engine module 4 moves and calculate the NRA value.

[0076] In practice: In the step of testing the eye's ability to relax and adjust through NRA (Negative Relative Accommodation), the object distance is adjusted by moving the optical module 4 through the control panel 9 to replace the traditional manual lens changing. This is far superior to the ±0.25D lens superposition error of manual adjustment, ensuring the repeatability and accuracy of the adjustment test results.

[0077] The optical engine module 4 includes a frame 41, a display module 42, and a viewing window 43. The display module 42 further includes a first display screen and a second display screen. The optical engine module 4 is fixedly connected to a transmission device 6, and the transmission device 6 is electrically connected to a control panel 9 located on the mounting plate 2. The control panel 9 resets the display module 42 to both sides of the frame 41 of the optical engine module 4. The adjustable range of the distance between the first and second display screens is 40mm-70mm to accommodate different interpupillary distances of subjects. After resetting the display module 42, the control panel 9 executes an instruction to increase the +0.25D spherical lens. Each increase moves the optical engine module 4 one position, gradually moving it from the first position (133mm) to the third position (200mm). Simultaneously, the distance between the visual targets gradually decreases. During this movement, the clarity of the visual targets is judged by the eyes. The size of the visual targets is selected to be slightly larger than the subject's best visual acuity; for example, if the subject's best visual acuity is 1.0, then a 0.8 line visual target is selected.

[0078] Table 1:

[0079]

[0080] Table 1 compares the changes in the moving distance of the optical engine module 4 and the distance between the targets. As shown in Table 1, when the control panel 9 executes the command to add a +0.25D spherical lens, the optical engine module 4 moves once, and at the same time, the distance between the targets gradually decreases.

[0081] For example, if the subject's interpupillary distance is 64mm, the adjustment relationship between the lens center distance and the interpupillary distance is as follows:

[0082] Pj = (400 / 433)Pd,

[0083] Where Pj is the center distance of the lens and Pd is the distance between the pupils for distance viewing.

[0084] Therefore, the lens center distance for a subject with an interpupillary distance of 64 mm is 59 mm.

[0085] The distance between the left and right visual targets is adjusted synchronously with the change in the object distance from the optical engine module 4 to the eye (i.e., the moving distance of the optical engine module 4). The relationship between the object distance and the adjustment of the display module 42 is as follows:

[0086] X = (400 - N) / 400 * Pd,

[0087] Where X is the distance between the target on the first display screen and the target on the second display screen, and N is the object distance from the optical engine module 4 to the eye.

[0088] For example, if the object distance from the optical engine module 4 to the eye is 148.1 mm, then the distance between the target on the first display screen and the target on the second display screen is 40.30 mm.

[0089] During the movement of the optical engine module 4, the clarity of the target is judged by visual inspection. If it is clear, the optical engine module 4 continues to move towards the third position (i.e., the control panel 9 executes the command to increase the +0.25D spherical lens) until the target becomes blurry and indistinguishable. If not, the number of times the optical engine module 4 moves is recorded, and the NRA value is calculated by subtracting 1 * +0.25D from the number of moves. For example, if the optical engine moves 4 times, the NRA value is +0.75D.

[0090] In one embodiment, the step of adjusting the lag or advance through the BCC test includes attaching the magnetic frame 7 with cross cylindrical lenses to the frame fixing panel 3, and switching the display module 42 to 2D single-screen mode through the control panel 9, moving the optical engine module 4 to the second position, and moving it to the first or third position, and judging by eye whether the horizontal and vertical lines of the grid are equally clear.

[0091] If so, record the distance moved by the optical engine module 4 and calculate the value of BCC;

[0092] If not, the optical engine module 4 moves to the first or third position until the horizontal and vertical lines of the grid are equally clear.

[0093] In practical implementation: During the BCC test to adjust for lag or advancement, the magnetic frame 7 with lenses of -0.50 / -1.00*180 (i.e., composed of a -1.00D spherical lens superimposed with ±0.50D cross-cylindrical lenses; the combined effect of the two lenses is a composite lens with a combined power of -0.50 / -1.00*180) is attached to the frame fixing panel 3. On the control panel 9, the display module 42 is switched to 2D single-screen mode, and the optical engine module 4 is moved to the second position (15.38cm). The control panel 9 displays a grid pattern at the center of the screen of the display module 42. The examinee judges whether the horizontal and vertical lines of the grid pattern are equally clear. The optometrist adjusts the balance by adding or subtracting spherical lenses based on the examinee's feedback using the control panel 9. If the examinee observes that the horizontal and vertical lines of the grid pattern are not equally clear, the optical engine module 4 is moved to the first position (133mm). Alternatively, the optical engine module 4 can be moved to the third position (i.e., 200mm). Specifically, if the horizontal lines of the tic-tac-toe pattern observed by the subject are clear, the optical engine module 4 is moved towards the third position (i.e., 200mm). If the vertical lines are clear, the optical engine module 4 is moved towards the first position (i.e., 133mm) until the horizontal and vertical lines of the tic-tac-toe pattern are equally clear. At this point, the neutralization point of the accommodation response is reached, and the distance moved by the optical engine module 4 is recorded (i.e., the position of the optical engine module 4 when the horizontal and vertical lines of the tic-tac-toe pattern are equally clear).

[0094] Table 2:

[0095]

[0096] Table 2 shows the moving distance of the optical engine module 4 and the corresponding BCC value. As shown in Table 2, when the optical engine module 4 moves to the second position (i.e., 15.38cm), the actual accommodation of the eye is exactly equal to the required accommodation, with neither accommodative lag nor accommodative lead, which is an ideal normal accommodation state. Moving the optical engine module 4 from the second position (i.e., 15.38cm) to the first position (i.e., 13.33cm) is equivalent to increasing the negative spherical lens, and moving it to the first position (i.e., 20cm) is equivalent to increasing the positive spherical lens. The greater the moving distance of the optical engine module 4, the smaller the accommodation required by the eye; the smaller the moving distance of the optical engine module 4, the greater the accommodation required by the eye.

[0097] For example, if the horizontal and vertical lines of the grid are equally clear when the optical module 4 is moved to 18.18cm, then the value of BCC is +1.00D.

[0098] In one embodiment, the step of testing the eye's ability to stimulate accommodation via PRA includes attaching a magnetic frame 7 with negative spherical lenses to the frame fixing panel 3, resetting the display module 42 to both sides of the optical engine module 4, moving the optical engine module 4 from a third position to a first position, and judging whether the visual target is clear by the eye.

[0099] If so, continue moving the optical engine module 4 toward the first position until the target becomes blurry and unrecognizable;

[0100] If not, record the number of times the optical engine module 4 moves and calculate the value of PRA.

[0101] In practice: The magnetic frame 7 with a -2.5 spherical lens is attached to the frame fixing panel 3, and the display module 42 is reset to both sides of the frame 41 of the optical engine module 4 via the control panel 9. The adjustable range of the distance between the first and second displays is 40mm-70mm to accommodate different interpupillary distances of the subjects. After resetting the display module 42, the control panel 9 executes the command to increase the -0.25D spherical lens. Each time the lens is increased, the optical engine module 4 moves once, thus gradually moving from the third position (i.e., 200mm) towards the first position (i.e., 133mm). At the same time, the distance between the visual targets also gradually increases. During the movement, the clarity of the visual targets is judged by the eyes. For example, if the subject's PD = 64mm, the size of the visual targets is selected to be slightly larger than the subject's best visual acuity. For example, if the best visual acuity is 1.0, then the 0.8 line visual targets are selected.

[0102] Table 3:

[0103]

[0104]

[0105] Table 3 compares the changes in the moving distance of the optical engine module 4 and the distance between the targets. As shown in Table 3, when the control panel 9 executes the command to increase the -0.25D spherical lens, the optical engine module 4 moves once. Moving the optical engine module 4 from the third position (i.e., 20cm) to the first position (i.e., 13.33cm) is equivalent to increasing the negative spherical lens. Simultaneously with the movement of the optical engine module 4, the distance between the targets gradually increases.

[0106] In one embodiment, the step of measuring the maximum accommodative power that can be used by one or both eyes by AMP includes attaching the magnetic frame 7 with negative spherical lenses to the frame fixing panel 3, switching the display module 42 to 2D single-screen mode, moving the optical engine module 4 from the third position to the first position, and judging by the eyes whether the visual target is clear and recognizable.

[0107] If so, continue moving the optical engine module 4 toward the first position until the target becomes blurry and unrecognizable;

[0108] If not, record the distance moved by the optical engine module 4 and calculate the value of AMP.

[0109] In practice: The magnetic frame 7 with a -2.5 spherical lens is attached to the frame fixing panel 3. Based on the subject's interpupillary distance (IPD), the distance between the fixing lens bracket 31 and the display module 42 is adjusted via the control panel 9 to match the subject's IPD. The adjustment relationship between the lens center distance and the IPD is Pj = (400 / 433)Pd, and the lens center distance is adjusted accordingly. For example, if the subject's IPD is 64mm, then the lens center distance is 59mm. The display module 42 is switched to 2D single-screen mode on the control panel 9, and the optical engine module 4 is moved to the third position (i.e., 20.00cm), displaying the smallest visual target in the center of the screen. The subject observes the visual target to see if it is clear and can identify the direction. If the subject reports that the visual target is clear and the direction is identifiable, the optical engine module 4 moves a certain distance towards the first position; if the subject reports that the visual target is unclear and the direction is not identifiable, the distance moved by the optical engine module 4 is recorded, and the AMP value is calculated.

[0110] Table 4:

[0111]

[0112] Table 4 shows the moving distance of the optical engine module 4 and the corresponding AMP value. As shown in Table 4, when the magnetic frame 7 with the -2.5 spherical lens is attached to the frame fixing panel 3, the movement of the optical engine module 4 from the third position (i.e., 20cm) to the first position (i.e., 13.33cm) is equivalent to gradually adding the negative spherical lens in a step of -0.25D.

[0113] The value of AMP is equal to the combined power of -10.00D. For example, when the optical module 4 is moved to 16.00cm, if the subject reports that the target is not clear and cannot identify the direction, the addition of negative spherical lens is stopped, and the value of AMP at this time is equal to 11.25D.

[0114] In another embodiment, the magnetic frame 7 is attached to the frame fixing panel 3. The magnetic frame 7 has slots for movable lenses and slots for fixing lenses 32. The slots for movable lenses can be used to hold lenses of different diopter, including but not limited to -5.00D, -7.50D, and -10.00D spherical lenses. The optometrist can switch between different lenses based on the patient's feedback. For example, if the patient reports that the target is clear, the optometrist can replace the lens with one of greater diopter power until the target is blurred, but clear again after about 3 seconds of observation.

[0115] In one embodiment, the step of quantifying the change in aggregate quantity caused by each unit adjustment change by AC / A includes switching the display module 42 to a dual-screen split-view mode, with the two screens displaying different targets respectively, and moving the optical engine module 4 from the third position to the first position;

[0116] When the optical-mechanical module 4 is in the third position, the eye judges whether the visual target is aligned.

[0117] If so, record the value of the rotating prism and repeat at least three times, taking the average value as the final value;

[0118] If not, adjust the alignment of different targets using Control Panel 9;

[0119] When the optical-mechanical module 4 is in the first position, the eye determines whether the visual target is aligned.

[0120] If the value of the rotating prism is recorded and repeated at least three times, the average value is taken as the final value;

[0121] If not, adjust the alignment of different targets using Control Panel 9;

[0122] Control panel 9 calculates the AC / A value based on the values ​​fed back from the third location and the first location.

[0123] In practical application: The AC / A ratio (Accommodative Convergence / Accommodation ratio) refers to the amount of prismatic power change in convergence that accompanies a 1 diopter (D) adjustment of the eye, usually expressed as prismatic power (Δ). The AC / A ratio reflects the linkage between accommodation and convergence, and is an important parameter for assessing and diagnosing strabismus, accommodation and convergence abnormalities, and for developing spectacle or treatment plans. Specifically, distance hemophobia is measured at 6m using the von Graefe method or Maddox rod, and the results are recorded. Exophobia is negative, and esophobia is positive. When measuring far-distance phoria (ΔD), the display module 42 is set to a dual-screen split-view mode, with different targets displayed on the two screens. Specifically, the left screen is set to an arrow target, and the right screen is set to a triangle target. The optical engine module 4 is moved to the third position (i.e., 20cm). At this time, the optical engine module 4 works with the 5D convex lens to simulate an infinite distance. The subject observes the targets on the display module 42 from one end of the frame fixing panel 3. At this time, the subject's left eye can see the arrow target on the left screen, and the right eye can see the triangle target on the right screen. The arrow target and triangle target are adjusted based on the subject's feedback to align them, and the data at this time is recorded as ΔD. Using control panel 9, set the optical module 4 to a working distance of 40cm and the accommodative stimulus to 2.5D. Have the subject observe the optotype on display module 42 from one end of the frame fixing panel 3. Based on the subject's feedback, adjust the arrow and triangle optotypes until they are aligned, and record the data as ΔN. For example, PD = 6cm, ΔD = -2Δ (exophoria), ΔN = +6Δ (esophoria). The formula calculation yields:

[0124]

[0125] Repeated measurements of far-range hysteresis (ΔD) and near-range hysteresis (ΔN) and averaged over multiple measurements can reduce random errors and improve data stability and accuracy.

[0126] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0127] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0128] Furthermore, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0129] The above description is only a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A visual function testing device, characterized in that, Includes housing, mounting plate, optical engine module, optical lens assembly, transmission device, frame fixing panel and magnetic frame; The frame fixing panel is located at one end of the outer shell and is fixedly connected to the outer shell; The frame fixing panel is provided with at least two lens fixing brackets for placing lens fixing brackets; the lens fixing brackets are movably located on one side of the frame fixing panel. A light-shielding structure is provided on the mounting plate near the fixed lens, and the light-shielding structure is located between the optical engine module and the fixed lens bracket; The optomechanical module is fixedly connected to the transmission device and is respectively disposed on the mounting plate, which is fixedly disposed inside the housing; The transmission device includes a first transmission module, a second transmission module, and a third transmission module; the first transmission module is fixedly connected to the optomechanical module; the second transmission module is movably connected to the fixed lens bracket; and the third transmission module is movably connected to the light-shielding structure. The magnetic eyeglass frame is attached to the eyeglass frame fixing panel, and the magnetic eyeglass frame is used to hold the optical lens assembly.

2. The visual function testing device according to claim 1, characterized in that, The optical lens assembly includes positive spherical lenses, negative spherical lenses, cross cylindrical lenses, rotating prisms, or auxiliary lenses to meet different examination needs. The light-shielding structure includes a light-shielding bracket, a left frame, and a right frame; the left frame and the right frame are movably mounted on the light-shielding bracket, and the light-shielding bracket is provided with several partitions. The left frame and the right frame are movably connected to the partitions and can move in the horizontal direction to adjust the field of vision of both eyes.

3. The visual function testing device according to claim 2, characterized in that, The optical engine module, the lens frame fixing panel, and the light shielding bracket are each provided with a number of guide rods; The guide rods of the optical-mechanical module are located on the left and right sides of the optical-mechanical module; The left and right frames are respectively provided with a first connecting block, a limiting block and a first slider. The limiting block and the first slider are respectively movably mounted on different guide rods on the light-shielding bracket. The first connecting block is fixedly connected to the third transmission module. The lens holder is provided with a second connecting block and a second slider, which are respectively located on different guide rods on the frame fixing panel.

4. The visual function testing device according to claim 3, characterized in that, The first transmission module includes a first driver, a drive belt, and a fixing block. One end of the drive belt is connected to the first driver to drive the drive belt to rotate. The fixing block is fixedly connected to the optomechanical module and the drive belt respectively, so as to realize that the drive belt drives the optomechanical module to move. The second transmission module includes a second drive rod and a second driver. One end of the second connecting block is movably connected to the second drive rod, and the other end is movably connected to the guide rod on the frame fixing panel. One end of the second drive rod is connected to the second driver for driving the second drive rod to move. The third transmission module includes a third drive rod and a drive block. One end of the drive block is movably connected to the third drive rod, and the other end is fixedly connected to the first connecting block. One end of the third drive rod is connected to the first driver to drive the third drive rod to move. The optical engine module includes a frame, a display module, and a viewing window. The display module is mounted on the frame, and the viewing window is vertically mounted on the mounting plate. One end of the mounting plate is equipped with a control panel, which is electrically connected to the optomechanical module and the transmission device respectively.

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