Binocular positive and negative relative adjustment inspection device based on overturning mirror and use method thereof

Abstract

The invention belongs to the technical field of visual function inspection devices, and relates to a double-eye positive and negative relative adjustment inspection device based on a turnover mirror and a use method thereof. The double-eye positive and negative relative adjustment inspection device comprises a fixing support, a turnover mirror installed at one end of the fixing support, a sighting mark structure arranged on the fixing support and double-row mirrors used for overlapping lenses. The flip mirror is configured to provide initial positive / negative degree regulation stimulation; the sighting mark structure is used for providing sighting marks watched by two eyes; the double-row glasses comprise a plurality of lens groups with different degrees and are used for overlapping and adjusting the degrees between the overturning glasses and the sighting mark structure so as to realize quantitative inspection of positive and negative relative adjustment of the two eyes. Initial + / -2.00 D adjustment stimulation is directly provided through the overturning mirror, the examination starting point of a traditional method is changed, the tedious process of gradual superposition from small degrees is avoided, a measured value can be achieved only through small-amount adjustment, and the examination efficiency is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of visual function testing devices, and relates to a binocular positive and negative relative accommodation testing device based on a flip mirror and its usage method. Background Technology

[0002] The traditional binocular positive and negative relative accommodation test involves the subject wearing corrective glasses and simultaneously focusing both eyes on the line above the best corrected visual acuity of a near vision chart at 40cm. Positive and negative spherical lenses are gradually added in front of both eyes (in increments of 0.25D) until the target becomes completely blurred and cannot be seen clearly. The subject then returns to the previous target and the result is recorded.

[0003] Positive relative accommodation (PRA) is the maximum amount of accommodation that can be achieved while keeping the convergence constant, given a certain amount of accommodation and convergence effort from both eyes. It is achieved by stacking multiple negative spherical lenses. Negative relative accommodation (NRA) is the maximum amount of accommodation that can be relaxed while keeping the convergence constant, given a certain amount of accommodation and convergence effort from both eyes. It is achieved by stacking multiple positive spherical lenses. The normal range of binocular positive and negative relative accommodation function is usually +1.50D to +2.50D and -1.50D to -3.50D. If a traditional binocular positive and negative relative accommodation testing device is used for binocular positive and negative relative accommodation testing, at least 6 stacks of positive / negative spherical lenses or more are required, resulting in low testing efficiency and not conforming to daily eye use habits.

[0004] In existing technologies, a reversing mirror (also known as a flipping mirror or bifocal mirror) has emerged for visual function training and examination. It typically consists of two positive lenses (e.g., +2.00D) and two negative lenses (e.g., -2.00D) of equal power, providing alternating accommodative stimulation through flipping. Such devices are primarily used to train and assess the eye's accommodative flexibility, but their direct application in quantitative accommodative amplitude testing lacks a mature solution. How to combine the advantages of tools like reversing mirrors, which provide standardized, alternating accommodative stimulation, with the core requirement of binocular positive and negative relative accommodation testing to overcome the low efficiency of traditional binocular positive and negative relative accommodation testing methods has become a technical problem worth exploring. If this can be achieved, it is expected to improve testing efficiency and expand its clinical application. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a binocular positive and negative relative accommodation examination device and its usage method based on a flip mirror, which uses a flip mirror for binocular positive and negative relative accommodation examination to solve the problem of low examination efficiency in traditional binocular positive and negative relative accommodation examination.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A binocular positive and negative relative accommodation examination device based on a flip mirror includes a fixed bracket, a flip mirror installed at one end of the fixed bracket, a visual target structure disposed on the fixed bracket, and a double-row mirror for stacking lenses; The flip mirror is configured to provide initial positive / negative degree adjustment stimulation; The target structure is used to provide an accommodative target for binocular fixation; The dual-row lens includes multiple sets of lenses with different powers, which are used to adjust the power by superimposing them between the flip lens and the optotype structure, so as to achieve a quantitative examination of the positive and negative relative accommodation of both eyes.

[0007] Furthermore, the flipping mirror has a structure that allows switching between positive and negative lenses, including at least two positive lenses and two negative lenses, so that both eyes can simultaneously load positive or negative lenses of the same power to form negative relative accommodation stimulation or positive relative accommodation stimulation, with an initial power of ±2.00D.

[0008] Furthermore, the flip mirror is either a planar rotating type or a lifting type. The planar rotating flip mirror includes a handle, a transmission system, a control system, and a lens frame. The lens frame is parallel to the axial plane of the handle and can rotate in the plane through the transmission system to achieve switching between positive and negative lenses.

[0009] 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.

[0010] Furthermore, 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.

[0011] 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.

[0012] Furthermore, the fixed bracket has a socket for placing the double-row mirror at the end away from the flip mirror.

[0013] On the other hand, the present invention also provides a method for examining the relative accommodation of both eyes based on a flip lens, using the aforementioned relative accommodation examination device, comprising the following steps: Adjust the optotype structure to a distance of 40cm from the flip mirror. In full refractive correction, the user uses both eyes to fixate on the optotype above the best corrected visual acuity of the near vision chart provided in the optotype structure as the accommodation optotype. Switch the flip lens to the initial positive / negative power. If the target is clear, then use the double-row lens to stack the same-direction lens group. If it is not clear, then stack the opposite-direction lens group until the target remains blurry. Return to the previous clear state and record the total power to quantitatively assess the positive / negative relative accommodation.

[0014] Furthermore, for positive relative adjustment: switch the flip lens to -2.00D. If it is clear, then use the double-row lens to sequentially stack negative lens groups from -0.25D. If it is not clear, then use the double-row lens to sequentially stack positive lens groups from +0.25D until the target remains blurry. Then return to the previous clear state and record the data as -2.00D plus the power of the stacked lens.

[0015] Furthermore, for negative relative adjustment: switch the flip lens to +2.00D. If it is clear, then use the double-row lens to sequentially stack positive lens groups from +0.25D. If it is not clear, then use the double-row lens to sequentially stack negative lens groups from -0.25D until the target remains blurry. Then return to the previous clear state and record the data as +2.00D plus the power of the stacked lens.

[0016] The beneficial effects of this invention are as follows: This invention provides a binocular positive and negative relative accommodation (PRA / NRA) testing device based on a flip-up mirror. By integrating a fixing bracket, a flip-up mirror, an optotype structure, and a double-row mirror, it achieves highly efficient binocular positive and negative relative accommodation (PRA / NRA) testing. The flip-up mirror, as the core component, directly provides initial ±2.00D accommodation stimulation. Combined with the optotype structure's visualization of the near vision chart at a fixed distance of 40cm, it ensures that binocular convergence remains constant. This design changes the starting point of the traditional method, avoiding the tedious process of gradually increasing diopters from small values. Only minor adjustments are needed to reach the measurement value, significantly improving testing efficiency.

[0017] In terms of usage, after the subject wears corrective glasses, the flip lens is switched to -2.00D (PRA) or +2.00D (NRA), and the ±0.25D gradient lens group of the dual-row mirrors is used for fine superposition until the target blur threshold is reached and the total power is recorded. This alternating stimulation mechanism simulates the rapid accommodation changes in daily eye use, reducing the traditional method's at least 6 superposition steps, shortening the examination time, and facilitating clinical operation. The grip design of the dual-row mirrors and the insertion hole for the fixing bracket further enhance the device's convenience.

[0018] In summary, this invention overcomes the limitations of existing flip mirrors, which are limited to training accommodative flexibility. By combining their advantages with quantitative examination, it is not only time-saving and efficient but also more in line with the natural eye habits of the human body. It is expected to expand its clinical application in visual function assessment and rehabilitation training, and promote the standardization and popularization of ophthalmological examinations. Furthermore, this binocular positive and negative relative accommodation testing device has a simple structure, low operating threshold, effectively improves examination efficiency, is easy to operate, and has low equipment cost, which is conducive to the application and promotion of visual function testing.

[0019] Other advantages, objectives, and features of the 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, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of a binocular positive and negative relative adjustment examination device based on a flip mirror, as described in the embodiment. Figure 2 This is a schematic diagram of the double-row mirror structure in the embodiment.

[0021] Reference numerals: 1. Fixed bracket; 2. Flip mirror; 3. Target structure; 4. Support base; 5. Pulley group; 6. Double row mirror; 61. Grip part; 62. Double row frame. Detailed Implementation

[0022] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. 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 invention. To better illustrate the embodiments of the 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 the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, 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 the present invention 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 the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Please see Figures 1-2 A binocular positive and negative relative adjustment examination device based on a flip mirror includes a fixed bracket 1 and a flip mirror 2 and a target structure 3 arranged at both ends of the fixed bracket 1, as well as a double-row mirror 6. 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.

[0026] The double-row mirror 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 mirror 6 superimposes the lens sets with different powers between the flip mirror 2 and the target structure 3.

[0027] Specifically, the gripping part 61 is arranged in the middle of the double-row frame 62. The upper part of the gripping part 61 in the double-row frame 62 contains multiple sets of positive lenses with gradually increasing power, and the lower part of the gripping part 61 contains multiple sets of negative lenses with gradually decreasing power. By moving the double-row mirror 6 up and down, different groups of lenses with different powers are superimposed between the flip mirror 2 and the optotype structure 3.

[0028] Furthermore, the gradients for the degree to increase and decrease are +0.25D and -0.25D, respectively.

[0029] Furthermore, a socket for placing the double-row mirror 6 is provided at the end of the fixed bracket 1 away from the flip mirror 2, so that the double-row mirror 6 can be placed on the fixed bracket 1 when not in use.

[0030] The flip mirror 2 is a planar rotating flip mirror, a lifting flip mirror, or a flip mirror of other structural forms.

[0031] 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.

[0032] 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 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 containing a lens. 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 lenses 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.

[0033] 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.

[0034] A method for using a binocular positive and negative relative accommodation testing device based on a flip-glass lens, wherein the user wears corrective glasses to perform a binocular positive and negative relative accommodation test using the aforementioned adjustment amplitude testing device based on a flip-glass lens: In the PRA test, the subject wears corrective glasses and simultaneously fixates on the line above the best corrected visual acuity of the near vision chart at 40cm with both eyes. A -2.00D lens is added. If the visual acuity is clear, a negative lens is added. If the visual acuity is unclear, a positive lens is added. This continues until the visual target remains blurry. The subject then returns to the previous clear visual target and records the data. The recorded data is: -2.00D + the power of the added lens. The NRA had the subject wear corrective glasses and simultaneously fixate on the line above the best corrected visual acuity of the near vision chart at 40cm. A +2.00D lens was added. If the visual acuity was clear, a positive lens was added; if it was not clear, a negative lens was added, until the visual target remained blurry. The subject then returned to the previous clear visual target and the data was recorded as: +2.00D + the power of the added lens. 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.

[0035] Example 1 Please see Figures 1-2 This embodiment provides a binocular positive and negative relative adjustment examination device based on a flip mirror, including a fixed bracket 1 and a flip mirror 2, a target structure 3 and a double-row mirror 6 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.

[0036] 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.

[0037] 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 containing 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.

[0038] The visual target 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 visual target structure 3 to be slidably arranged on the fixed bracket 1. The visual target structure 3 is used to provide a visual target for binocular fixation.

[0039] This embodiment also provides a method for using a binocular positive and negative relative accommodation testing device based on a flip-up mirror. Using this device, the user wears corrective glasses to perform a binocular positive and negative relative accommodation test. Specifically, positive relative accommodation (PRA) involves the subject wearing corrective glasses and simultaneously focusing both eyes on the line above the best corrected visual acuity of a near vision chart at 40cm. A -2.00D lens is added. If the visual acuity is clear, a negative lens is added; if it is unclear, a positive lens is added, until the visual target remains blurry. The user then returns to the previous clear visual target and records the data as: -2.00D + the added lens power. Negative relative accommodation (NRA) involves the subject wearing corrective glasses and simultaneously focusing both eyes on the line above the best corrected visual acuity of a near vision chart at 40cm. A +2.00D lens is added. If the visual acuity is clear, a positive lens is added; if it is unclear, a negative lens is added, until the visual target remains blurry. The user then returns to the previous clear visual target and records the data as: +2.00D + the added lens power. The specific steps include: For PRA: Step 1: Move the optotype structure 3 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 optotype structure 3 at 40cm, as the adjustment optotype. Step 2: Switch between the two lenses of the flip mirror 2 and -2.00D. The user observes the adjustment target through the flip mirror 2. If it is clear, the negative lens group is stacked sequentially from -0.25D through the double-row mirror 6. If it is not clear, the positive lens group is stacked sequentially from +0.25D through the double-row mirror until the target remains blurry. 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.

[0040] For NRA: Step 1: Move the optotype structure 3 to a distance of 40cm from the flip mirror 2. The user's eyes simultaneously focus on the line above the best corrected visual acuity of the near vision chart in the optotype structure 3 at 40cm, as the adjustment optotype. Step 2: Switch between the two lenses of the flip mirror 2 and +2.00D. The user observes the adjustment target through the flip mirror 2. If it is clear, the positive lens group is stacked sequentially from +0.25D through the double-row mirror 6. If it is not clear, the negative lens group is stacked sequentially from -0.25D through the double-row mirror until the target remains blurry. 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.

[0041] Example 2 Please see Figures 1-2 This embodiment provides a binocular positive and negative relative adjustment examination device based on a flip mirror, including a fixed bracket 1 and a flip mirror 2, a target structure 3 and a double-row mirror 6 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.

[0042] 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.

[0043] The flip mirror 2 is a lift-up flip mirror or a front-and-back flip mirror, including at least two positive lenses and two negative lenses. The positive and negative lenses are arranged symmetrically, one above the other, so that both eyes simultaneously receive the same positive or negative accommodative stimulation, with an initial power of ±2.00D. By switching between the positive and negative lenses through lifting or flipping, the initial positive / negative accommodative stimulation can be provided.

[0044] 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.

[0045] This embodiment also provides a method for using a binocular positive and negative relative accommodation testing device based on a flip-up mirror. Using this device, the user wears corrective glasses to perform a binocular positive and negative relative accommodation test. Specifically, positive relative accommodation (PRA) involves the subject wearing corrective glasses and simultaneously focusing both eyes on the line above the best corrected visual acuity of a near vision chart at 40cm. A -2.00D lens is added. If the visual acuity is clear, a negative lens is added; if it is unclear, a positive lens is added, until the visual target remains blurry. The user then returns to the previous clear visual target and records the data as: -2.00D + the added lens power. Negative relative accommodation (NRA) involves the subject wearing corrective glasses and simultaneously focusing both eyes on the line above the best corrected visual acuity of a near vision chart at 40cm. A +2.00D lens is added. If the visual acuity is clear, a positive lens is added; if it is unclear, a negative lens is added, until the visual target remains blurry. The user then returns to the previous clear visual target and records the data as: +2.00D + the added lens power. The specific steps include: For PRA: Step 1: Move the optotype structure 3 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 optotype structure 3 at 40cm, as the adjustment optotype. Step 2: Switch between the two lenses of the flip mirror 2 and -2.00D. The user observes the adjustment target through the flip mirror 2. If it is clear, the negative lens group is stacked sequentially from -0.25D through the double-row mirror 6. If it is not clear, the positive lens group is stacked sequentially from +0.25D through the double-row mirror until the target remains blurry. 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.

[0046] For NRA: Step 1: Move the optotype structure 3 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 optotype structure 3 at 40cm, as the adjustment optotype. Step 2: Switch between the two lenses of the flip mirror 2 and +2.00D. The user observes the adjustment target through the flip mirror 2. If it is clear, the positive lens group is stacked sequentially from +0.25D through the double-row mirror 6. If it is not clear, the negative lens group is stacked sequentially from -0.25D through the double-row mirror until the target remains blurry. 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.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention 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 solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A binocular positive and negative relative adjustment examination device based on a flip-glass mirror, characterized in that, It includes a fixed bracket, a flip mirror mounted on one end of the fixed bracket, a target structure disposed on the fixed bracket, and a double-row mirror for stacking lenses; The flip mirror is configured to provide initial positive / negative degree adjustment stimulation; The target structure is used to provide an accommodative target for binocular fixation; The dual-row lens includes multiple sets of lenses with different powers, which are used to adjust the power by superimposing them between the flip lens and the optotype structure, so as to achieve a quantitative examination of the positive and negative relative accommodation of both eyes.

2. The binocular positive and negative relative adjustment examination device according to claim 1, characterized in that, The flip mirror is a structure with switchable positive / negative lenses, including at least two positive lenses and two negative lenses, so that both eyes can simultaneously load positive or negative lenses of the same power to form negative relative accommodation stimulation or positive relative accommodation stimulation, with an initial power of ±2.00D.

3. The binocular positive and negative relative adjustment examination device according to claim 2, characterized in that, The flip mirror is either a planar rotating type or a lifting type. The planar rotating flip mirror includes a handle, a transmission system, a control system, and a lens frame. The lens frame is parallel to the axial plane of the handle and can rotate in the plane through the transmission system to achieve switching between positive and negative lenses.

4. The binocular positive and negative relative adjustment examination device according to claim 1, characterized in that, 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.

5. The binocular positive and negative relative adjustment examination device according to claim 4, characterized in that, 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.

6. The binocular positive and negative relative adjustment examination device according to claim 1, characterized in that, The fixed bracket is equipped with a length scale and a pulley system. 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.

7. The binocular positive and negative relative adjustment examination device according to claim 1, characterized in that, The fixed bracket has a socket for placing the double-row mirror at the end away from the flip mirror.

8. A method for examining the relative positive and negative accommodation of both eyes based on a flip lens, characterized in that, The binocular positive and negative relative accommodation examination device according to any one of claims 1-7 includes the following steps: Adjust the optotype structure to a distance of 40cm from the flip mirror. In full refractive correction, the user uses both eyes to fixate on the optotype above the best corrected visual acuity of the near vision chart provided in the optotype structure as the accommodation optotype. Switch the flip lens to the initial positive / negative power. If the target is clear, then use the double-row lens to stack the same-direction lens group. If it is not clear, then stack the opposite-direction lens group until the target remains blurry. Return to the previous clear state and record the total power to quantitatively assess the positive / negative relative accommodation.

9. The method for examining bilateral positive and negative relative accommodation according to claim 8, characterized in that, For positive relative adjustment: switch the flip lens to -2.00D. If it is clear, use the double-row lens to sequentially stack negative lens groups from -0.25D. If it is not clear, use the double-row lens to sequentially stack positive lens groups from +0.25D until the target is continuously blurred. Then return to the previous clear state and record the data as -2.00D plus the power of the stacked lens.

10. The method for examining bilateral positive and negative relative accommodation according to claim 8, characterized in that, For negative relative adjustment: switch the flip lens to +2.00D. If it is clear, use the double-row lens to sequentially stack positive lens groups from +0.25D. If it is not clear, use the double-row lens to sequentially stack negative lens groups from -0.25D until the target is continuously blurred. Then return to the previous clear state and record the data as +2.00D plus the power of the stacked lens.

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