Visual function testing device based on a flip-up mirror

Abstract

This invention belongs to the technical field of visual function testing devices, specifically a visual function testing device based on a flip mirror. It includes a fixed support and a flip mirror and a target structure arranged at both ends of the fixed support. The target structure is slidably arranged on the fixed support to move closer to or further away from the flip mirror. A length scale is provided on the fixed support along the sliding direction of the target structure to achieve accommodation amplitude testing. A detachably connected point light source is also provided on the target structure, and a Maldice rod cooperating with the point light source is detachably arranged in the right viewing window of the flip mirror to achieve eye position and AC / A testing. It also includes a double-row mirror for superimposing and adjusting the power between the flip mirror and the target structure. The double-row mirror includes multiple sets of lenses with different powers to achieve binocular positive and negative relative accommodation testing. This invention overcomes the limitations of dispersed equipment in traditional methods, improving testing efficiency by combining the standardized adjustment stimulation of the flip mirror with detachable components.

Description

Technical Field

[0001] This utility model belongs to the technical field of visual function testing devices, and relates to a visual function testing device based on a flip mirror. Background Technology

[0002] Traditional visual function tests are a crucial step in assessing the normal functioning of the visual system, typically including core parameters such as accommodative amplitude, binocular positive and negative relative accommodation, and eye position. Currently, clinical practice largely relies on multiple independent instruments for these tests, resulting in cumbersome procedures, long processing times, and overall inefficiency that needs improvement.

[0003] In existing technologies, flip mirrors (also known as reversing mirrors or double-sided mirrors) are widely used as a common visual function training tool. They typically consist of a group of positive and negative lenses of equal power, which provide standardized alternating accommodative stimulation to the eye through manual or mechanical flipping. Some improved designs also integrate an eye patch structure for monocular occlusion. The main function of such devices is to train and assess the eye's accommodative flexibility, i.e., the eye's ability to quickly and accurately change its accommodative state. However, although flip mirrors provide good accommodative stimulation, their function is relatively limited, and a mature, integrated solution has not yet been developed for direct use in the aforementioned comprehensive visual function examinations.

[0004] Therefore, how to deeply integrate the potential of the flip mirror, a tool capable of providing standardized, alternating accommodative stimulation, with the core requirements of comprehensive visual function testing to design a highly integrated and user-friendly novel examination device has become a technical problem worth exploring. This is expected to overcome the inefficiencies caused by the dispersed equipment and poor functional integration in traditional examination methods, and further expand the scope of this tool in clinical visual health assessment and application. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a visual function inspection device based on a flip mirror, so as to overcome the problem of low efficiency caused by the dispersed equipment and poor functional integration in traditional inspection methods.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A visual function testing device based on a flip mirror includes a fixed bracket and a flip mirror and a target structure arranged at both ends of the fixed bracket. The target structure is slidably arranged on the fixed bracket to move closer to or further away from the flip mirror. A length scale is provided on the fixed bracket along the sliding direction of the target structure to realize the adjustment range test. The target structure is also provided with a detachable point light source, and a Martens rod that cooperates with the point light source is detachably arranged in the right window of the flip mirror to realize the examination of eye position, joint convergence and accommodation ratio. It also includes a double-row lens for superimposing and adjusting the power between the flip lens and the optotype structure, the double-row lens comprising multiple groups of lenses with different powers to achieve binocular positive and negative relative accommodation examination.

[0007] Furthermore, the flip mirror is a planar rotating flip mirror or a lifting flip mirror.

[0008] Furthermore, when the flip mirror is a planar rotating flip mirror, it includes a handle and a lens frame. The handle is equipped with a transmission system and a control system. The lens frame is connected to the transmission system and is located at the upper end of the handle. The lens frame is parallel to the plane along the axial direction of the handle. The control system controls the transmission system to drive the lens frame to rotate in this plane. The lens frame consists of four lens frames, each with detachably connected lenses. The centers of the four lens frames are located on the same circumference centered on the center of the lens frame. The plane rotation is the circular motion of the four lenses around the center of the lens frame. The lenses in the four lens frames are two positive lenses and two negative lenses, respectively, and are located on two intersecting axes. The two positive lenses are located on the same axis, and the two negative lenses are located on the other axis, so that the two positive lenses and the two negative lenses are respectively centrally symmetrical, thereby allowing the user to apply positive or negative lenses to both eyes. An eye shield is provided on the lens frame, which rotates around its center to cover one of the lenses, either positive or negative, that is loaded onto the user's eyes.

[0009] Furthermore, the positive and negative lenses are set as +2.00D and -2.00D lenses, respectively, to achieve quantitative and amplitude checks of the relative positive and negative accommodation of the two eyes.

[0010] Furthermore, the positive and negative lenses are set as +1.00D and -1.00D lenses, respectively, to achieve the accommodative convergence and accommodative ratio check of the relative positive and negative accommodation of the two eyes.

[0011] Furthermore, the target structure is detachably mounted on the support base, and the support base is slidably connected to the fixed bracket through a pulley group embedded in the fixed bracket, thereby allowing the target structure to be slidably arranged on the fixed bracket.

[0012] Furthermore, the optotype structure is a tablet computer, and the tablet computer is magnetically connected to the support base to provide optotype images required for checking accommodation amplitude, binocular positive and negative relative accommodation, eye position, and accommodative convergence and accommodation ratio.

[0013] Furthermore, the double-row lens includes a grip and a double-row frame, on which multiple sets of positive / negative lenses with a power gradient of ±0.25D are arranged; The positive lens group is located at the upper part of the grip and rises in a gradient, while the negative lens group is located at the lower part of the grip and descends in a gradient. By moving the double-row mirror up and down, lens groups of different powers are superimposed between the flip mirror and the target structure.

[0014] Furthermore, the fixed bracket is equipped with a length scale and a pulley system, and the target structure is connected to the pulley system through a support base, so as to slide along the target structure to adjust it to a distance of 40cm from the flip mirror.

[0015] Furthermore, the end of the fixed bracket away from the flip mirror is provided with a socket for placing the double-row mirror.

[0016] The beneficial effects of this utility model are as follows: This invention provides a visual function testing device based on a flip mirror. By integrating components such as a fixed bracket, a flip mirror, a sliding target structure, double-row mirrors, a point light source, and a Maddox bar, it achieves a unified platform for testing multiple visual functions, including accommodation amplitude, binocular positive and negative relative accommodation, eye position, and AC / A ratio. This device overcomes the limitations of dispersed equipment in traditional methods by combining standardized accommodation stimuli from the flip mirror with detachable components, such as the sliding design and length scale of the target structure, facilitating accurate distance measurement and calculation of accommodation amplitude, thereby improving the accuracy and convenience of the examination.

[0017] Specifically, the device supports multiple mode switching: it enables quantitative assessment of binocular positive and negative relative accommodation through the superposition of gradient lens groups in a double-row configuration; combined with a point light source and Maddox rod, it allows for eye position and AC / A examinations on a four-axis or single-row optotype card, quickly identifying strabismus types and calculating relevant values. This integrated design simplifies the operation process and reduces the need for switching instruments. For example, using a tablet computer as the optotype structure to provide digital optotype cards further improves flexibility and clinical applicability, significantly shortening examination time compared to traditional standalone devices.

[0018] Overall, this device improves the efficiency and integration of visual function assessment, contributing to standardized applications in clinical visual health management. Its ease of operation and low cost not only make it convenient for healthcare professionals but also extend to training and rehabilitation scenarios, potentially improving patient experience and promoting early intervention for visual problems. Furthermore, the device's simple structure and low operational threshold effectively improve examination efficiency, and its convenient operation and low cost facilitate the widespread application of visual function testing.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of a visual function testing device based on a flip mirror in Example 1; Figure 2 This is a schematic diagram of a binocular positive and negative relative adjustment examination device based on a flip mirror in Example 2; Figure 3 This is a schematic diagram of the double-row mirror structure in Example 2; Figure 4 This is a schematic diagram of an eye position examination device based on a flip mirror in Example 3; Figure 5 This is a schematic diagram of the structure of the four-axis target card in Example 3; Figure 6 This is a schematic diagram of the structure of the horizontal single-row visual target card in Example 4.

[0021] Figure reference numerals: 1. Fixed bracket, 2. Flip mirror, 3. Target structure, 4. Support base, 5. Pulley block, 6. Double row mirror, 7. Length scale, 8. Point light source. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" 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 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Example 1 Please see Figure 1 This is a visual function testing device based on a flip mirror, used for amplitude adjustment testing. Specifically, it includes a fixed support 1 and flip mirrors 2 and target structures 3 arranged at both ends of the fixed support 1. The target structures 3 are slidably arranged on the fixed support 1 to move closer to or further away from the flip mirrors 2. A length scale 7 is provided on the fixed support 1 along the sliding direction of the target structures 3. The flip mirror 2 is a planar rotating flip mirror, specifically the planar rotating flip mirror disclosed in patent publication number CN117942022A or the planar rotating flip mirror disclosed in patent publication number CN107970025B. The flip mirror 2 includes a handle and a lens frame. The handle contains a transmission system and a control system. The lens frame is connected to the transmission system and is located at the upper end of the handle. The lens frame is parallel to the plane along the axial direction of the handle. The control system controls the transmission system to rotate the lens frame in this plane. The lens frame consists of four lens frames, each detachably connected to a lens. The centers of the four lens frames are located on the same circumference centered on the center of the lens frame. The rotation of the plane is the movement of the four lenses around the circumference of the center of the lens frame. The lenses in the four lens frames are two positive lenses and two negative lenses, respectively located on two intersecting axes. The two positive lenses are located on one axis, and the two negative lenses are located on the other axis, so that the two positive lenses and two negative lenses are respectively centrally symmetrical, thereby allowing the user to apply either a positive or negative lens to both eyes. The positive and negative lenses are +2.00D and -2.00D lenses, respectively. An eye shield that rotates around its center is provided on the lens frame to cover one of the positive or negative lenses applied to the user's eyes. The target structure 3 is a tablet computer with a built-in target, and the tablet computer is magnetically connected to the support base 4. The support base 4 is slidably connected to the fixed bracket 1 through a pulley group 5 embedded in the fixed bracket 1, thereby allowing the target structure 3 to be slidably arranged on the fixed bracket 1.

[0026] In this embodiment, the device is used as follows: The subject wears corrective glasses, selects the line above the best visual acuity of either the right or left eye as the accommodation target, and covers one eye to perform a monocular accommodation amplitude test. Specifically, the following steps are included: Step 1: Move the target structure 3 to a set distance from the flip mirror 2, the set distance being 40cm; Step 2: Switch the two lenses of the flip mirror 2 to -2.00D, and cover one of the lenses of the flip mirror 2 with an eye patch. Then, in the fully corrected refractive state, the user uses the corresponding monocular to observe the optotype structure 3 through the uncovered lens and selects the top row of optotypes with the best visual acuity as the accommodation optotype. Step 3: Move the target structure 3 towards the flip mirror 2 at a speed of 1-2 cm / s. First, move the target structure 3 towards the flip mirror 2 until the accommodative target seen by the user is continuously blurred, and then return to the clear distance. This distance is taken as the minimum distance at which the user can clearly see the accommodative target. The accommodative amplitude of the user's corresponding monocular eye is 1 / the minimum distance (distance is in meters, and accommodative stimulation is in D) plus the accommodative stimulation of the corresponding lens. The accommodative stimulation of the corresponding lens is -2.00D.

[0027] Specifically, when testing the left eye, the lens of the right eye is covered by an eye occluder; when testing the right eye, the lens of the left eye is covered by an eye occluder, thus quickly completing the accommodation range test.

[0028] Example 2 Please see Figures 2-3 This embodiment adds a double-row mirror 6 to the embodiment 1 to form a binocular positive and negative relative adjustment examination device based on a flip mirror. It includes a fixed bracket 1 and flip mirrors 2 and optotype structure 3 arranged at both ends of the fixed bracket 1, as well as double-row mirrors 6. The optotype structure 3 is slidably arranged on the fixed bracket 1 to be close to or away from the flip mirror 2, and a length scale is provided on the fixed bracket 1 along the sliding direction of the optotype structure 3.

[0029] The double-row lens 6 includes a grip portion 61 and a double-row frame 62 arranged on the grip portion 61. The double-row frame 62 has multiple sets of lenses with different powers, and the double-row lens 6 stacks these lens sets between the flip mirror 2 and the visual target structure 3. Specifically, the grip portion 61 is located in the middle of the double-row frame 62. The upper part of the double-row frame 62 contains multiple sets of positive lenses with gradually increasing power, while the lower part contains multiple sets of negative lenses with gradually decreasing power. By moving the double-row lens 6 up and down, the double-row lens 6 stacks these lens sets between the flip mirror 2 and the visual target structure 3. The gradients for the increasing and decreasing power are +0.25D and -0.25D, respectively. A socket for placing the double-row lens 6 is provided at the end of the fixed bracket 1 away from the flip mirror 2, allowing the double-row lens 6 to be placed on the fixed bracket 1 when not in use.

[0030] The flip mirror 2 is a planar rotating flip mirror, specifically the planar rotating flip mirror disclosed in patent publication number CN117942022A or the planar rotating flip mirror disclosed in patent publication number CN107970025B. The flip mirror 2 includes a handle and a lens frame. The handle contains a transmission system and a control system. The lens frame is connected to the transmission system and is located at the upper end of the handle. The lens frame is parallel to the plane along the handle's axis. The control system controls the transmission system to rotate the lens frame in this plane. The lens frame consists of four lens frames, each detachably connected to a lens. The centers of the four lens frames are located on the same circumference centered on the center of the lens frame. Planar rotation involves the four lenses moving around the circumference of the lens frame center. The lenses in the four lens frames are two positive lenses and two negative lenses, located on two intersecting axes. The two positive lenses are on one axis, and the two negative lenses are on the other axis, making the two positive lenses and two negative lenses centrally symmetrical, thus allowing the user to apply either positive or negative lenses to both eyes. The initial power of the positive and negative lenses is ±2.00D.

[0031] The optotype structure 3 is detachably mounted on the support base 4. The support base 4 is slidably connected to the fixed bracket 1 via a pulley group 5 embedded in the fixed bracket 1, thereby allowing the optotype structure 3 to be slidably arranged on the fixed bracket 1. The optotype structure 3 is used to provide a near vision chart for binocular fixation.

[0032] This embodiment also provides a method for using a binocular positive and negative relative accommodation testing device based on a flip-up lens. Using this device, the user performs binocular positive and negative relative accommodation tests while in full refractive correction. Specifically, for positive relative accommodation (PRA), the subject wears corrective glasses and simultaneously fixates on the line above the best corrected visual acuity of a near vision chart at 40cm, adding a -2.00D lens. If the image is clear, a negative lens is added; if it is unclear, a positive lens is added, until the image remains blurry. The user then returns to the previous clear image and records the data as: -2.00D + the added lens power. For negative relative accommodation (NRA), the subject wears corrective glasses and simultaneously fixates on the line above the best corrected visual acuity of a near vision chart at 40cm, adding a +2.00D lens. If the image is clear, a positive lens is added; if it is unclear, a negative lens is added, until the image remains blurry. The user then returns to the previous clear image and records the data as: +2.00D + the added lens power.

[0033] Specifically, the following steps are included: PRA: Step 1: Move the optotype structure to a distance of 40cm from the flip mirror. The user's eyes simultaneously focus on the line above the best corrected visual acuity of the near vision chart in the visual acuity structure at 40cm, as the adjustment optotype. Step 2: Switch the flip-up mirror to the two lenses of -2.00D. The user observes the adjustment target through the flip-up mirror. If it is clear, the negative lens group is stacked sequentially from -0.25D through the double-row mirror. If it is not clear, the positive lens group is stacked sequentially from +0.25D through the double-row mirror until the target is continuously blurred. Then return to the lens group when the target was clear and record the data. The recorded data is: -2.00D + the power of the corresponding superimposed lens group. NRA: Step 1: Move the optotype structure to a distance of 40cm from the flip mirror. The user's eyes simultaneously focus on the line above the best corrected visual acuity of the near vision chart in the visual acuity structure at 40cm, as the adjustment optotype. Step 2: Switch the two lenses to +2.00D using the flip mirror. The user observes the target through the flip mirror. If it is clear, the user stacks positive lens groups sequentially from +0.25D using the double-row mirror. If it is not clear, the user stacks negative lens groups sequentially from -0.25D using the double-row mirror until the target remains blurry. Then, the user returns to the lens group with the previous clear target and records the data. The recorded data is: +2.00D + the power of the corresponding superimposed lens group.

[0034] Example 3 Please see Figures 4-5This embodiment adds a point light source 8 and a Martens rod to the basis of embodiment 1, forming an eye position examination device based on a flip mirror. It includes a fixed bracket 1 and a flip mirror 2 and a target structure 3 arranged at both ends of the fixed bracket 1. The target structure 3 is slidably arranged on the fixed bracket 1 to be close to or away from the flip mirror 2, and a length scale is provided on the fixed bracket 1 along the sliding direction of the target structure 3.

[0035] The flip mirror 2 is a planar rotating flip mirror, a lifting flip mirror, or a flip mirror of other structural forms.

[0036] Specifically, when the flip mirror is a planar rotating flip mirror, it can be a planar rotating flip mirror disclosed in patent publication number CN117942022A or a planar rotating flip mirror disclosed in patent publication number CN107970025B.

[0037] It should be noted that the flip mirror 2 in this embodiment includes a handle and a lens frame. The handle is equipped with a transmission system and a control system. The lens frame is connected to the transmission system and is located at the upper end of the handle. The lens frame is parallel to the plane of the handle axis. The control system controls the transmission system to drive the lens frame to rotate in this plane. The lens frame consists of four lens frames, the centers of which are located on the same circumference centered on the center of the lens frame. The plane rotation is the circumferential motion of the four lens frames around the center of the lens frame. The lens frame does not have a lens, and a magnetic structure for detachably connecting the Martens rod is provided at the right eye window of the flip mirror 2 to arrange the Martens rod.

[0038] Furthermore, the target structure 3 is detachably mounted on the support base 4, and the support base 4 is slidably connected to the fixed bracket 1 through a pulley group 5 embedded in the fixed bracket 1, thereby allowing the target structure 3 to be slidably arranged on the fixed bracket 1.

[0039] The target structure 3 is a four-axis target card or a tablet computer with a built-in four-axis target card image. The tablet computer is magnetically connected to the support base 4. The support base 4 is slidably connected to the fixed bracket 1 through a pulley group 5 embedded in the fixed bracket 1, thereby allowing the target structure 3 to be slidably arranged on the fixed bracket 1.

[0040] The four-axis target card includes three horizontal scale lines arranged at intervals and one vertical scale line. The vertical scale line connects the zero points of the three horizontal scale lines, and the zero point of the vertical scale line intersects with the zero point of the middle horizontal scale line. A point light source 8 that cooperates with a Martens rod is arranged at the intersection of the zero point of the vertical scale line and the zero point of the middle horizontal scale line.

[0041] A method for using an eye position examination device based on a flip-glass lens: The device is used to place a Maddox rod in the right lens frame of the flip-glass lens. The user observes the four-axis optotype card located at 40 cm with both eyes in a fully corrected refractive state. The point light source 8 is located at the intersection of the 0 mark of the vertical scale line and the 0 mark of the horizontal scale line located in the middle.

[0042] Specifically, the following steps are included: Horizontal Martens bar placement inspection: When a horizontal Mahalanobis rod is placed in the right lens frame, the user's right eye observes a vertical ray of light. Without the Mahalanobis rod in the left lens frame, the user observes a point of light. Evaluate the positional relationship between the point and the line when both eyes are simultaneously looking at them: If a vertical ray of light passes exactly through the spot of light, it is considered orthographic. If the two are separated, there is strabismus; If the light spot seen by the left eye is to the left of the vertical light ray, it is judged as esotropia. At the same time, the scale value corresponding to the vertical light ray falling on the middle horizontal scale line is recorded as the degree of esotropia. If the light spot seen by the left eye is to the right of the vertical light ray, it is determined to be exotropia. At the same time, the scale value corresponding to the vertical light ray falling on the middle horizontal scale line is recorded as the degree of exotropia.

[0043] If the observed light ray is an oblique line, it is determined that there is rotational strabismus. Record the scale values ​​of the vertical light ray falling on the three horizontal scale lines respectively. Among them, the lower eye position value - upper eye position value < 0 indicates eye inversion, the lower eye position value - upper eye position value > 0 indicates eye exversion, and the lower eye position value - upper eye position value = 0 indicates rotational orthotropia. Combine the scale values ​​of the vertical scale lines to calculate the degree of rotational strabismus.

[0044] Specifically, the method for calculating the rotational oblique angle is as follows: first, calculate the sine value of the oblique line based on the absolute difference between the scale values ​​of the upper and lower horizontal scale lines and the distance between the upper and lower horizontal scale lines; Then, by using the arcsine function to find the rotation angle of the oblique line, the rotational oblique angle can be calculated.

[0045] Vertical Martens bar placement inspection: When a vertical Magnetoresistive rod is placed in the right lens frame, the user's right eye observes a horizontal ray of light. Without the Magnetoresistive rod in the left lens frame, the user observes a point of light. Evaluate the positional relationship between the point and the line when both eyes are simultaneously looking at them: If a horizontal ray of light passes exactly through the spot of light, it is considered orthographic. If the two are separated, there is strabismus; If the light spot seen by the left eye is below the horizontal light ray seen by the right eye, it is judged as right eye hypotropia. At the same time, the scale value corresponding to the horizontal light ray falling on the vertical scale line is recorded as the degree of right eye hypotropia. If the light spot seen by the left eye is above the horizontal light ray seen by the right eye, it is determined to be right eye upward strabismus. At the same time, the scale value corresponding to the horizontal light ray falling on the vertical scale line is recorded as the degree of right eye upward strabismus.

[0046] Example 4 Please see Figure 4 and Figure 6 This embodiment adds a point light source 8 and a Martens rod to the basis of embodiment 1, forming an adjustable set and adjustment ratio inspection device based on a flip mirror. It includes a fixed bracket 1 and a flip mirror 2 and a target structure 3 arranged at both ends of the fixed bracket 1. The target structure 3 is slidably arranged on the fixed bracket 1 to be close to or away from the flip mirror 2, and a length scale is provided on the fixed bracket 1 along the sliding direction of the target structure 3.

[0047] The flip mirror 2 is a planar rotating flip mirror, a lifting flip mirror, or a flip mirror of other structural forms.

[0048] Specifically, when the flip mirror is a planar rotating flip mirror, it can be a planar rotating flip mirror disclosed in patent publication number CN117942022A or a planar rotating flip mirror disclosed in patent publication number CN107970025B.

[0049] It should be noted that the flip mirror 2 in this embodiment includes a handle and a lens frame. The handle is equipped with a transmission system and a control system. The lens frame is connected to the transmission system and is located at the upper end of the handle. The lens frame is parallel to the plane of the handle axis. The control system controls the transmission system to drive the lens frame to rotate in this plane. The lens frame is composed of four lens frames. The centers of the four lens frames are located on the same circumference centered on the center of the lens frame. The plane rotation is the movement of the four lens frames around the circumference of the center of the lens frame. The four lens frames contain two positive lenses and two negative lenses, which are located on two intersecting axes. The two positive lenses are located on the same axis, and the two negative lenses are located on the other axis, so that the two positive lenses and the two negative lenses are centrally symmetrical, thereby allowing the user to apply positive or negative lenses to both eyes.

[0050] Furthermore, the target structure 3 is detachably mounted on the support base 4, and the support base 4 is slidably connected to the fixed bracket 1 through a pulley group 5 embedded in the fixed bracket 1, thereby allowing the target structure 3 to be slidably arranged on the fixed bracket 1.

[0051] The target structure 3 is a horizontal single-row target card or a tablet computer with a built-in horizontal single-row target card image. The tablet computer is magnetically connected to the support base 4. The support base 4 is slidably connected to the fixed bracket 1 through a pulley group 5 embedded in the fixed bracket 1, thereby allowing the target structure 3 to be slidably arranged on the fixed bracket 1.

[0052] The horizontal single-line target card is a horizontal scale line, and a point light source 8 that cooperates with the Martens rod is arranged at the 0 mark of the horizontal scale line.

[0053] A method for using an accommodative set and accommodation ratio testing device based on a flip-up mirror, wherein the four lens frames are respectively set as a set of +1.00D lenses and a set of -1.00D lenses, and a horizontal Magnet bar is placed at the right eye window of the flip-up mirror. First, switch the flip mirror to the state where a -1.00D lens group is added in front of both eyes. At the same time, a horizontal Maddox rod is superimposed on the right eye window. At this time, the right eye observes a vertical line, while the left eye does not add a Maddox rod and observes a bright point light source. Evaluate the positional relationship between the point and the line when both eyes are looking at the same time, and record the scale value on the horizontal scale line where the vertical line is located at this time. Next, switch the flip lens to the state where a +1.00D lens group is added in front of both eyes. At the same time, a horizontal Maldextral bar is superimposed on the right eye's viewing window. At this time, the right eye sees a vertical line, while the left eye, without the Maldextral bar, sees a bright point light source. Evaluate the positional relationship between the point and the line when both eyes are looking simultaneously, and record the scale value on the horizontal scale line where the vertical line is located at this time; The data from the two tests are calculated, and the AC / A value is output.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A flipper mirror based visual function testing device, characterized in that, It includes a fixed bracket and a flip mirror and a target structure arranged at both ends of the fixed bracket. The target structure is slidably arranged on the fixed bracket to move closer to or further away from the flip mirror. A length scale is provided on the fixed bracket along the sliding direction of the target structure to realize the adjustment range check. The target structure is also provided with a detachable point light source, and a Martens rod that cooperates with the point light source is detachably arranged in the right window of the flip mirror to realize the examination of eye position, accommodative convergence and accommodation ratio. It also includes a double-row lens for superimposing and adjusting the power between the flip lens and the optotype structure, the double-row lens comprising multiple groups of lenses with different powers to achieve binocular positive and negative relative accommodation examination.

2. The flipper mirror based visual function test apparatus according to claim 1, wherein The flip mirror is a planar rotating flip mirror or a lifting flip mirror.

3. The flipper mirror based visual function test apparatus according to claim 2, wherein When the flip mirror is a planar rotating flip mirror, it includes a handle and a lens frame. The handle is equipped with a transmission system and a control system. The lens frame is connected to the transmission system and is located at the upper end of the handle. The lens frame is parallel to the plane of the handle axis. The control system controls the transmission system to drive the lens frame to rotate in this plane. The lens frame consists of four lens frames, each with detachably connected lenses. The centers of the four lens frames are located on the same circumference centered on the center of the lens frame. The plane rotation is the circular motion of the four lenses around the center of the lens frame. The lenses in the four lens frames are two positive lenses and two negative lenses, respectively, and are located on two intersecting axes. The two positive lenses are located on the same axis, and the two negative lenses are located on the other axis, so that the two positive lenses and the two negative lenses are respectively centrally symmetrical, thereby allowing the user to apply positive or negative lenses to both eyes. An eye shield is provided on the lens frame, which rotates around its center to cover one of the lenses, either positive or negative, that is loaded onto the user's eyes.

4. The flipper mirror based visual function test apparatus according to claim 3, wherein The positive and negative lenses are set to +2.00D and -2.00D lenses, respectively, to enable quantitative and amplitude checks of the relative positive and negative accommodation of the two eyes.

5. The flipper mirror based visual function test apparatus according to claim 3, wherein The positive and negative lenses are set to +1.00D and -1.00D lenses, respectively, to achieve accommodative convergence and accommodation ratio checks.

6. The flipper mirror based visual function test apparatus according to claim 1, wherein The target structure is detachably mounted on the support base, which is slidably connected to the fixed bracket via a pulley system embedded in the fixed bracket, thereby allowing the target structure to be slidably arranged on the fixed bracket.

7. The visual function testing device based on a flip mirror according to claim 5, characterized in that, The optotype structure is a tablet computer, and the tablet computer is magnetically connected to the support base to provide optotype images required for checking accommodation amplitude, binocular positive and negative relative accommodation, eye position, and accommodative convergence and accommodation ratio.

8. The apparatus according to claim 1, wherein The double-row lens includes a grip and a double-row frame, on which multiple sets of positive / negative lenses with a power gradient of ±0.25D are arranged; The positive lens group is located at the upper part of the grip and rises in a gradient, while the negative lens group is located at the lower part of the grip and descends in a gradient. By moving the double-row mirror up and down, lens groups of different powers are superimposed between the flip mirror and the target structure.

9. The apparatus according to claim 1, wherein The fixed support is provided with a length scale and a pulley block, the visual target structure is connected with the pulley block through a supporting seat, and sliding along the visual target structure is realized to adjust to a position 40 cm away from the flip mirror.

10. The visual function testing device according to claim 1, characterized in that, An end of the fixed support away from the flip mirror is provided with a jack for placing the double-row mirror.

Images