Multifunctional double-eye visual function measuring scale

Abstract

The utility model discloses a multifunctional binocular visual function measuring scale, which comprises a trial frame and a sighting mark, and further comprises a measuring scale connecting piece, a pair of first measuring scales and a second measuring scale, the trial frame and the first measuring scales are fixedly connected through the measuring scale connecting piece, the first measuring scales are symmetrically arranged on the two sides of the trial frame in parallel, and the second measuring scales are symmetrically arranged on the two sides of the trial frame. Central grooves are formed in the first measuring rulers, the two ends of the second measuring ruler are connected through sliding blocks and are arranged in the central grooves of the first measuring rulers on the two sides in a sliding mode respectively, and the sighting mark can be arranged at any position on the second measuring ruler according to measuring requirements. According to the utility model, the structure is simple, various measurement functions are integrated through selection of the sighting mark and adjustment of the trial frame, the adjustment is convenient, the support of electronic equipment is not needed, a static indicator is used for reading, the reading error caused by parallax is avoided, the measurement precision is higher, the device is suitable for various use scenes, the use threshold is low, and the portability is realized; and popularization of vision screening and visual function examination work is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of visual function testing devices, specifically to a multifunctional binocular visual function measuring ruler. Background Technology

[0002] With the development of information technology and the widespread use of electronic products, people's visual behavior has changed significantly, and prolonged exposure to electronic products has greatly affected visual health. Studies have shown that the eye's convergence and accommodation functions are closely related to the comfort of near work, and that accommodative dysfunction is related to the occurrence and development of myopia. Therefore, examination of accommodation and convergence functions is indispensable in clinical practice.

[0003] Methods for measuring accommodative amplitude mainly include the near / far shift method, negative lens method, and dynamic retinoscopy. Clinically, the near / far shift method is primarily used for measuring accommodative amplitude. A phoropter is a commonly used instrument in clinical practice for measuring accommodative amplitude and convergence near point. However, due to its high price, large size, and inconvenience for portability, its usage rate in mobile ophthalmic screening is extremely low. Furthermore, because the phoropter's thimble (refractometer disc) is relatively thick, the examinee's vision is often obstructed, preventing a smooth examination. Additionally, the small viewing window of the phoropter prevents the examiner from constantly observing changes in the examinee's eye position during the examination, significantly affecting the accuracy of convergence near point measurement.

[0004] To address the above issues, there are also some adjustable measuring rulers on the market specifically designed for testing adjustable functions. These can be divided into two types: one type has a stable support system, making it less prone to errors caused by shaking, but the overall structure is relatively complex, making it difficult to store and access at any time, lacking flexibility and mobility, and thus difficult to widely apply in clinical practice; the other type consists of a measuring ruler and a trial lens frame, which is simple in equipment, but the stability of the measuring tool is poor, and the repeatability and reliability of the measurement data are difficult to guarantee. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a multifunctional binocular vision measuring ruler that is simple in structure and easy to carry.

[0006] Technical solution: A multifunctional binocular vision measuring ruler includes a trial frame, a visual target, and further includes: a measuring ruler connector, a first measuring ruler, and a second measuring ruler. The trial frame and the first measuring ruler are fixedly connected by the measuring ruler connector. The first measuring rulers are a pair of parallel and symmetrically arranged on both sides of the trial frame. The first measuring ruler has a central groove. The two ends of the second measuring ruler are respectively slidably arranged in the central grooves of the two first measuring rulers. The visual target can be set at any position on the second measuring ruler according to the measurement requirements.

[0007] Preferably, the two ends of the second measuring ruler are respectively connected to the measuring slider. The measuring slider includes a fixed block, a slider and a locking block arranged coaxially. The locking block of the measuring slider has a connecting hole. The second measuring ruler is connected to the measuring slider through the connecting hole. The fixed block and the locking block cooperate to limit the slider in the central groove.

[0008] Preferably, the measuring slider also includes an indicator, which is fixed to the locking block.

[0009] Preferably, when the measuring slider is at both ends of the central groove, the indicator is aligned with the zero mark and the maximum mark of the first measuring scale, respectively.

[0010] Preferably, the measuring ruler connector includes a base and a C-shaped connecting part. The base is fixedly connected to the first measuring ruler, and one end of the C-shaped connecting part is fixedly connected to the base, while the other end is fixedly connected to the trial frame.

[0011] Specifically, the trial frame includes replaceable lenses.

[0012] Preferably, the second measuring ruler is marked with graduations, and the zero mark is located in the center of the second measuring ruler (5).

[0013] Beneficial effects: Compared with the prior art, the improvements of this utility model include:

[0014] (1) The structure of this utility model is simple. At the same time, through the selection of optotypes and the assistance of the trial frame, it integrates multiple measurement functions, such as the measurement of the convergence near point, the measurement of near vision, the measurement of the accommodation amplitude of monocular and binocular vision, the measurement of positive and negative relative accommodation, etc. It is easy to adjust, does not require any electronic equipment support, uses static indicators to read the value, avoids reading errors caused by parallax, and has high measurement accuracy.

[0015] (2) This utility model is inexpensive, easy to learn and operate, has a low threshold for use, is portable, and is suitable for a variety of use scenarios. Even non-professionals can quickly get started and use it, which helps to popularize the preliminary vision screening work. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of the present invention.

[0017] Figure 2 This is an enlarged view of the measuring slider of this utility model.

[0018] Figure 3 This is an enlarged view of the measuring ruler connector of this utility model.

[0019] Figure 4 This is a schematic diagram of the second measuring ruler of this utility model. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] Please refer to Figure 1 As shown, this embodiment provides a multifunctional binocular vision measuring ruler, including a trial frame 1, a visual target 2, a measuring ruler connector 3, and a pair of first measuring rulers 4 and second measuring rulers 5 that are identical in shape and size. The trial frame 1 and the first measuring rulers 4 are fixedly connected by the measuring ruler connector 3. The first measuring rulers 4 are symmetrically arranged parallel to each other on both sides of the trial frame 1, and each first measuring ruler 4 has a central groove 41. The two ends of the second measuring ruler 5 are respectively slidably disposed in the central grooves 41 of the two first measuring rulers 4 on both sides, and the visual target 2 is located in the center of the second measuring ruler 5.

[0023] The trial frame 1 has a slot at its front end to hold lenses of different spherical and cylindrical powers, meeting the needs of patients with varying degrees of refractive error to achieve full refractive correction. In this embodiment, the first measuring ruler 4 is 40cm long, which meets the length requirements for near visual acuity measurement, convergence point measurement, and monocular / binocular accommodation function measurement. It can also be used with spherical lenses of different powers to examine positive and negative relative accommodation capabilities. The optotype 2 can be selected from various clinically commonly used myopia targets according to the measurement purpose and needs. During use, the optotype 2 is simply pasted into the center of the second measuring ruler 5 or the corresponding position required for the examination. Compared to the simple use of pen tips as optotypes in clinical practice, the selection of optotypes is more standardized, enabling accurate and quantitative near visual acuity measurement.

[0024] Please refer to Figure 2 As shown, the second measuring scale 5 is connected to measuring sliders 6 at both ends. The measuring slider 6 includes a coaxially arranged fixing block 61, slider 62, and locking block 63. The measuring slider 6 has a coaxial connecting hole 64 through which all components pass. The second measuring scale 5 is connected to the measuring slider 6 via the connecting hole 64. The fixing block 61 and locking block 63 cooperate to limit the slider 62 within the central groove 41. The measuring slider 6 also includes an indicator 65, which is fixed to the locking block 63. The tip of the indicator 65 is on the same vertical plane as the sight mark 2. When the measuring slider 6 is at either end of the central groove 41, the tip of the indicator 65 is aligned with the zero and maximum scale of the first measuring scale 4, respectively. The design of the indicator 65 enables static reading, avoiding reading errors caused by parallax.

[0025] Please refer to Figure 3As shown, the measuring ruler connector 3 includes a base 31 and a C-shaped connector 32. The base 31 is fixedly connected to the first measuring ruler 4. One end of the C-shaped connector 32 is fixedly connected to the base 31, and the other end is fixedly connected to the head of the trial frame 1. In this embodiment, the first measuring ruler 4 and the measuring ruler connector 3 are integrated. The C-shaped connector 32 is provided with multiple round holes 321. After the bolts are passed through the round holes 321, the trial frame 1 and the C-shaped connector 32 can be tightly fixed. This design avoids the error caused by the operator fixing the ordinary measuring ruler by hand.

[0026] Please refer to Figure 4 As shown, in this embodiment, the second measuring ruler 5 is marked with a scale, and the zero mark is located in the center of the second measuring ruler 5, which facilitates the positioning and fixing of the target. The cross-section of the second measuring ruler 5 is rectangular, which matches the shape of the connecting hole 64, allowing for quick and convenient plug-in connection. At the same time, by finely adjusting the depth of the second measuring ruler 5 inserted into the connecting hole 64, different interpupillary distances can be adjusted.

[0027] A typical working process in this embodiment is as follows:

[0028] Select a trial frame 1 that matches the examinee's pupillary distance. Insert both ends of the second measuring ruler 5 into the connecting holes 64 on both sides. Adjust the distance between the first measuring rulers 4 on both sides so that they remain parallel and the distance between the first measuring rulers 4 is equal to the distance between the posts on both sides of the trial frame 1. Insert the posts of the trial frame 1 into the C-shaped connecting part 32, and use bolts to pass through the round hole 321 to fix the trial frame 1 and the first measuring rulers 4 in place, so that the zero mark of the first measuring rulers 4 on both sides is in close contact with the front surface of the posts of the trial frame 1. According to the examinee's distance refractive error prescription, place the corresponding lens in the slot at the front end of the trial frame 1, and have the examinee wear the trial frame 1 to begin the measurement.

[0029] The following example illustrates the specific methods for measuring visual function parameters:

[0030] Binocular Accommodation Amplitude Measurement (Near-to-Distance Method): Attach the myopia target card to the second measuring ruler 5, ensuring the vertical midline of the myopia target card is aligned with the zero mark of the second measuring ruler 5. Move the second measuring ruler 5 to the end of the central groove 41 of the first measuring ruler 4, with the tip of the indicator 65 pointing to the 40cm mark on the first measuring ruler 4, ensuring the myopia target card is 40cm in front of the midline of both eyes. Instruct the subject to focus their eyes on the target line above their best visual acuity on the myopia target card. Move the second measuring ruler 5 at approximately 1cm / s, slowly and uniformly moving it towards the subject within the central groove 41 of both sides of the first measuring ruler 4. Stop moving when the subject reports the target becoming blurred, and record the mark value corresponding to the tip of the indicator 65 at this time as L1. Slowly move the second measuring ruler 5 away from the subject, stopping when the subject describes the target becoming clear again, and record the mark value corresponding to the tip of the indicator 65 at this time as L2. Calculate the average of L1 and L2 to obtain the subject's binocular accommodation amplitude.

[0031] Monocular accommodative amplitude measurement (near-far method): When measuring monocular accommodative amplitude, insert the cover into the slot on the side of the trial frame 1 that is not being measured to cover that eye. Place the optotype 2 on the second measuring ruler 5 directly in front of the line of sight of the measuring eye, ensuring that the distance from the vertical midline of the optotype 2 to the zero mark on the second measuring ruler 5 is equal to the size of the monocular pupillary distance of the eye being measured. The remaining measurement procedures are the same as those described for binocular accommodative amplitude measurement.

[0032] Near point convergence measurement: Select a near single-column optotype card and attach it to the second measuring ruler 5, ensuring that the vertical midline of the near single-column optotype card is aligned with the zero mark of the second measuring ruler 5. Instruct the subject to fixate on the single-column optotype card with both eyes. Push the second measuring ruler 5 at a constant speed from the 40cm mark towards the subject's eyes, while observing changes in the subject's eye position. Stop moving the second measuring ruler 5 when the subject experiences diplopia or the examiner observes the subject's eyes suddenly diverging. Read the scale value corresponding to the tip of indicator 65 at this moment and record the distance of the convergence break point. Continue moving the second measuring ruler 5 at a constant speed away from the subject until the subject regains binocular single vision (i.e., returns to convergence position). Read the scale value corresponding to the tip of indicator 65 at this moment and record the distance of the convergence recovery point.

[0033] Positive and negative relative accommodation measurement: Attach the myopia target card to the second measuring ruler 5, ensuring the vertical midline of the myopia target card is aligned with the zero mark of the second measuring ruler 5. Move the second measuring ruler 5 to the end of the central groove 41 of the first measuring ruler 4, with the tip of the indicator 65 pointing to the 40cm mark on the first measuring ruler 4, ensuring the myopia target card is 40cm in front of the midline of both eyes. Instruct the subject to focus on the line above their best visual acuity on the myopia target card. After full correction of both eyes for distance refractive error, simultaneously add positive lenses in front of both eyes until the subject reports their first persistent blur; record the total amount of positive lenses added, which is the negative relative accommodation. After full correction of both eyes for distance refractive error, simultaneously add negative lenses in front of both eyes until the subject reports their first persistent blur; record the total amount of negative lenses added, which is the positive relative accommodation.

[0034] Precise near-vision supplemental measurement for presbyopia: After replacing the fully corrective lenses for both eyes on the trial frame 1 with experimental near-vision supplemental lenses, attach the myopia target card to the second measuring ruler 5, ensuring that the vertical midline of the myopia target card is aligned with the zero mark of the second measuring ruler 5. Move the second measuring ruler 5 in the central groove 41 of the first measuring ruler 4 to the subject's preferred near reading distance, with the tip of the indicator 65 pointing to the subject's preferred near distance position on the first measuring ruler 4, ensuring that the myopia target card is located in front of the midline of both eyes at the preferred near distance. Instruct the subject to focus on the line above their best visual acuity on the myopia target card. With full correction of distance refractive error in both eyes, simultaneously add positive lenses in front of both eyes until the subject reports the first instance of persistent blurring; record the total amount of positive lenses added, i.e., negative relative accommodation. With full correction of distance refractive error in both eyes, simultaneously add negative lenses in front of both eyes until the subject reports the first instance of persistent blurring; record the total amount of negative lenses added, i.e., positive relative accommodation. The required precise proximity of the subject is calculated by measuring the positive and negative relative accommodation and the subject's experimental proximity.

[0035] Near visual acuity measurement: Select a nearsightedness target card and attach it to the second measuring ruler 5, ensuring that the vertical midline of the nearsightedness target card is aligned with the zero mark of the second measuring ruler 5. Move the second measuring ruler 5 until the tip of the indicator 65 points to the same measurement distance required on the first measuring ruler 4 as the nearsightedness target card. Complete the monocular near visual acuity measurement by covering one eye of the subject separately; complete the binocular near visual acuity measurement while maintaining binocular fixation.

Claims

1. A multifunctional binocular vision measuring ruler, comprising a trial frame (1) and optotypes (2), characterized in that, Also includes: Measuring ruler connector (3), first measuring ruler (4) and second measuring ruler (5), the trial frame (1) and the first measuring ruler (4) are fixedly connected by measuring ruler connector (3), the first measuring ruler (4) is a pair of parallel and symmetrically arranged on both sides of the trial frame (1), the first measuring ruler (4) has a central groove (41) on it, the two ends of the second measuring ruler (5) are respectively slidably arranged in the central groove (41) of the two sides of the first measuring ruler (4), and the eye target (2) is set on the second measuring ruler (5).

2. The multifunctional binocular vision measuring ruler according to claim 1, characterized in that: The second measuring ruler (5) is connected to the measuring slider (6) at both ends. The measuring slider (6) includes a fixed block (61), a slider (62) and a locking block (63) arranged coaxially. The measuring slider (6) has a connecting hole (64). The second measuring ruler (5) is connected to the measuring slider (6) through the connecting hole (64). The fixed block (61) and the locking block (63) cooperate to limit the slider (62) in the central groove (41).

3. The multifunctional binocular vision measuring ruler according to claim 2, characterized in that: The measuring slider (6) also includes an indicator (65) which is fixed on the locking block (63).

4. The multifunctional binocular vision measuring ruler according to claim 3, characterized in that: When the measuring slider (6) is at both ends of the central groove (41), the indicator (65) is aligned with the zero mark and the maximum mark of the first measuring ruler (4), respectively.

5. The multifunctional binocular vision measuring ruler according to claim 1, characterized in that: The measuring ruler connector (3) includes a base (31) and a C-shaped connector (32). The base (31) is fixedly connected to the first measuring ruler (4). One end of the C-shaped connector (32) is fixedly connected to the base (31), and the other end is fixedly connected to the trial frame (1).

6. The multifunctional binocular vision measuring ruler according to claim 1, characterized in that: The trial frame (1) includes replaceable lenses.

7. The multifunctional binocular vision measuring ruler according to claim 1, characterized in that: The second measuring ruler (5) is marked with graduations, and the zero mark is located in the center of the second measuring ruler (5).

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