Vision detector

Abstract

The utility model discloses a vision detector, which belongs to the field of medical detection equipment and comprises a darkroom shell, a plurality of conversion lenses and a reflector component. An eyepiece is arranged at one end of the darkroom shell. And the plurality of conversion lenses are arranged in the darkroom shell. The reflector assembly comprises a general reflector which is arranged opposite to the eyepiece. A near vision path and a middle vision path used for sighting mark imaging on the conversion lenses can be formed between the eyepiece and the conversion lenses. According to the utility model, two traditional instruments for respectively carrying out near vision detection and middle vision detection are integrated, so that the vision detector with a near vision detection system and a middle vision detection system at the same time is obtained. The two vision detection systems can be switched through the displacement of the conversion lens or the universal reflection lens, the switching process is not affected by light, environment, distance and the like, a patient can complete detection through self-operation, and the workload of medical staff is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of medical detection equipment, and specifically relates to a visual acuity tester. BACKGROUND

[0002] The visual acuity tester is a common medical device used for evaluating people's visual function and determining their eye health condition. The optotype screen in the visual acuity tester is used to present the visual image, while the touch screen and buttons are used for the feedback of the tester. By using electronic technology, the visual acuity tester can automatically record and store the test results, so that doctors and ophthalmic professionals can more conveniently analyze and track the visual condition of patients.

[0003] In recent years, the concept of intermediate visual acuity has been proposed and gradually applied in the medical field. In life, intermediate visual acuity scenes include computer operation, chess entertainment, housework, etc., and intermediate visual acuity plays an important role in cataract, presbyopia, and employment of the elderly. The intermediate visual acuity measurement distance in China is set to 60 cm, while the intermediate visual acuity measurement distance abroad is generally 80 cm, because the average length of the arms of Chinese people is lower than that of foreigners. Some patients have good distance visual acuity and near visual acuity, but cannot see clearly at intermediate distances, which is due to the deviation of intermediate visual acuity. A person's visual acuity needs to be fully reflected by the single and binocular visual acuity of the three distances of far, intermediate, and near. With these complete basic data, doctors can analyze the causes in the clinic.

[0004] The specific method and steps for detecting near visual acuity include: the medical staff visually ensures that the visual acuity plate card and the eyes of the person being tested are basically parallel and at a distance of about 30 cm, the medical staff guides the person being tested to cover the eye to be tested, the doctor points out the optotype on the plate card, and the person being tested reads out the opening direction of the optotype until the person being tested reads the optotype incorrectly or cannot see it clearly. The specific method and steps for detecting intermediate visual acuity are the same as the test process of the near visual acuity chart except that the distance requirement is about 60 cm.

[0005] Whether it is an intermediate visual acuity chart or a near visual acuity chart, it is easily affected by light, environment, distance, etc., which can cause a large deviation in visual acuity results and increase the workload of medical staff. The visual acuity tester can well eliminate the above-mentioned defects. However, the current visual acuity tester only has one of the functions of near visual acuity detection or intermediate visual acuity detection, and does not have an instrument that can simultaneously test intermediate visual acuity and near visual acuity. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims to provide a visual acuity tester to solve the problems in the prior art.

[0007] A visual acuity tester is provided, which comprises:

[0008] A darkroom shell, one end of the darkroom shell is provided with an eyepiece;

[0009] A plurality of conversion lenses, the plurality of conversion lenses are arranged inside the darkroom shell;

[0010] A mirror assembly, comprising a general-purpose mirror lens, the general-purpose mirror lens is arranged opposite to the eyepiece;

[0011] The eyepiece and the plurality of conversion lenses can form a near vision path and an intermediate vision path for the imaging of the target on the conversion lens through the displacement of at least one of the conversion lens or the general-purpose mirror lens.

[0012] As a further scheme of the utility model: the inside of the darkroom shell is provided with a partition plate and forms a near vision imaging chamber and an intermediate vision imaging chamber through the partition plate, the conversion lens is provided with two, two the conversion lenses are arranged in the near vision imaging chamber and the intermediate vision imaging chamber respectively, the general-purpose mirror lens and the darkroom shell are slidingly connected.

[0013] As a further scheme of the utility model: the conversion lens is provided with one, the general-purpose mirror lens is fixedly connected with the darkroom shell, the conversion lens and the general-purpose mirror lens can slide relatively, the conversion lens can form a near vision path and an intermediate vision path through sliding between the eyepiece.

[0014] As a further scheme of the utility model: the mirror assembly further comprises an intermediate vision mirror lens group, the intermediate vision mirror lens group is arranged at one end of the darkroom shell away from the general-purpose mirror lens, the conversion lens can form a near vision path between the eyepiece through displacement, and the conversion lens can form an intermediate vision path between the eyepiece through displacement and the reflection of the intermediate vision mirror lens group.

[0015] As a further scheme of the utility model: the displacement method of the conversion lens comprises at least one of translation or rotation.

[0016] As a further scheme of the utility model: the inside of the darkroom shell is provided with a partition plate, the conversion lens can rotate relative to the partition plate, the intermediate vision mirror lens group comprises a first lens and a second lens, and the imaging nodes of the target of the conversion lens on the intermediate vision path pass through the first lens, the second lens, the general-purpose mirror lens and the eyepiece in sequence.

[0017] As a further scheme of the utility model: further comprising a driving assembly, the driving assembly comprises a driving motor, a transmission swing arm and two induction switches, the conversion lens and the driving motor are drivingly connected through the transmission swing arm, the conversion lens can be driven to rotate by the driving motor, and the two induction switches are arranged on the rotation path of the transmission swing arm.

[0018] As a further scheme of the utility model: the inductive switch is a hall switch, and a magnet is arranged in the transmission swing arm.

[0019] As a further scheme of the utility model: the utility model further includes a visual target screen, and the visual target screen is arranged opposite to the conversion lens.

[0020] As a further scheme of the utility model: the utility model further includes an eye shield, and the eye shield is arranged in the eyepiece.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] The utility model integrates the traditional two instruments for near and intermediate visual acuity detection, and obtains a visual acuity detector with a near visual acuity detection system and an intermediate visual acuity detection system, thereby improving the integration degree of the instrument. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in combination with the drawings.

[0024] Fig. 1 The utility model provides the internal structure schematic view of darkroom shell;

[0025] Fig. 2 The utility model provides the side view of darkroom shell;

[0026] Fig. 3 The utility model provides the overall structure schematic view of a visual acuity detector.

[0027] In the drawing: 1, darkroom shell;11, eyepiece;12, baffle;2, conversion lens;3, reflection mirror assembly;31, general reflection mirror piece;32, intermediate visual reflection mirror piece group;321, first lens;322, second lens;4, driving assembly;41, driving motor;42, transmission swing arm;43, inductive switch;5, visual target screen;6, eye shield. DETAILED DESCRIPTION

[0028] In order to make the utility model's purpose, technical scheme and advantage more clear and intelligible, the following combines with the drawing and embodiment, and the utility model is further described in detail. The components of the utility model embodiments described and shown in the drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.

[0030] Please refer to Figs. 1-3 As shown in the drawings, in the embodiment of the application, a visual acuity detector includes a darkroom shell 1, a plurality of conversion lenses 2, and a mirror assembly 3. The darkroom shell 1 is provided with an eyepiece 11 at one end. The plurality of conversion lenses 2 are arranged inside the darkroom shell. The mirror assembly 3 includes a general-purpose mirror 31, which is arranged opposite the eyepiece 11. The eyepiece 11 and the plurality of conversion lenses 2 can form a near vision path and an intermediate vision path for imaging the optotypes on the conversion lenses 2 by displacement of at least one of the conversion lenses 2 or the general-purpose mirror 31.

[0031] The darkroom shell 1 is a shell for accommodating the conversion lenses 2 and the mirror assembly 3 and the like, which is used to ensure that the visual acuity test is not affected by the environment and distance. The conversion lenses 2 can be an electronic screen that directly displays the optotypes, or an imaging lens that images the optotypes on the conversion lenses 2 through an external display screen. Therefore, the visual acuity detector can also be provided with an optotype screen 5, and the optotypes on the optotype screen 5 can be displayed on the conversion lenses 2 through optical imaging or electronic imaging technology, and then the optotypes are imaged on the general-purpose mirror 31 through the conversion lenses 2. The general-purpose mirror 31 has a certain angle, which is used to reflect the optotype image on the conversion lenses 2 to the eyepiece 11, so that the patient can see the internal optotypes through the eyepiece 11, and then perform visual acuity detection.

[0032] In order to make the detector have both near vision detection and intermediate vision detection systems, the conversion lenses 2 or the general-purpose mirror 31 can be displaced relative to the darkroom shell 1. By displacement of the conversion lenses 2 or the general-purpose mirror 31, the distance between the conversion lenses 2 and the general-purpose mirror 31 is changed, and a near vision path and an intermediate vision path with different viewing distances are obtained, wherein the near vision path is 30 cm, and the intermediate vision path is 60 cm or 80 cm. In the following embodiments, the intermediate vision path is 60 cm. The above method is used to switch the near and intermediate vision detection systems, so that the patient can perform visual acuity detection at two viewing distances on one instrument.

[0033] In one embodiment, the interior of the darkroom shell 1 is provided with a partition 12 and forms a near vision imaging chamber and an intermediate vision imaging chamber through the partition 12, the switching lens 2 is provided with two, and the two switching lenses 2 are respectively arranged in the near vision imaging chamber and the intermediate vision imaging chamber. The general reflecting lens 31 is in sliding connection with the darkroom shell 1.

[0034] This switching method is realized by two fixed switching lenses 2 and one movable general reflecting lens 31. When detecting near vision, the general reflecting lens 31 slides above the near vision imaging chamber 13, and at this time, under the isolation of the partition 12, the general reflecting lens 31 only images the optotypes on the switching lens 2 in the near vision imaging chamber. When detecting intermediate vision, the general reflecting lens 31 slides above the intermediate vision imaging chamber, and the general reflecting lens 31 only images the optotypes on the switching lens 2 in the intermediate vision imaging chamber.

[0035] By adjusting the height of the corresponding switching lens 2 in the near vision imaging chamber and the intermediate vision imaging chamber, the imaging distance between the corresponding switching lens 2 and the ocular lens 11 after the optotypes on the corresponding switching lens 2 are reflected by the general reflecting lens 31 meets the 30cm of the near vision path and the 60cm of the intermediate vision path. Since the two switching lenses 2 can block each other, the optotypes on the optotype screen 5 cannot be imaged on the two switching lenses 2 respectively through optical imaging principle. At this time, the optotype screen 5 can transmit images in the form of electrical signals to the switching lens 2 through electrical signal transmission principle.

[0036] This switching method only needs to slide the general reflecting lens 31, but since it is directly imaged by the switching lens 2 and the general reflecting lens 31, there is no other conversion path, and the imaging distance needs to meet the 60cm of the intermediate vision path, which will increase the overall thickness of the darkroom shell 1, and further increase the overall thickness of the detector. In addition, two switching lenses 2 need to be arranged inside the detector, which increases the cost of the equipment.

[0037] In one embodiment, the switching lens 2 is provided with one, the general reflecting lens 31 is fixedly connected with the darkroom shell 1, and the switching lens 2 and the general reflecting lens 31 can slide relative to each other. The switching lens 2 can form a near vision path and an intermediate vision path by sliding with the ocular lens 11.

[0038] Specifically, the sliding path of the conversion lens 2 is located between the conversion lens 2 and the general reflection lens 31. When the near vision detection is performed, the conversion lens 2 moves towards the general reflection lens 31 until the imaging distance between the conversion lens 2 and the eyepiece 11 after the reflection of the conversion lens 2 by the general reflection lens 31 meets the 30cm of the near vision path. Similarly, when the intermediate vision detection is performed, the conversion lens 2 moves away from the general reflection lens 31 until the imaging distance between the conversion lens 2 and the eyepiece 11 after the reflection of the conversion lens 2 by the general reflection lens 31 meets the 60cm of the intermediate vision path. Since the conversion lens 2 will move relative to the target screen 5, the target on the target screen 5 cannot be stably displayed on the conversion lens 2, and therefore the target screen 5 can transmit the image to the conversion lens 2 in the form of an electrical signal through the principle of electrical signal transmission.

[0039] This switching method only needs to slide the conversion lens 2, but since the imaging is directly through the conversion lens 2 and the general reflection lens 31, there is no other conversion path, and the imaging distance needs to meet the 60cm of the intermediate vision path, which will increase the overall height of the darkroom shell 1, and thus increase the overall height of the detection instrument.

[0040] In one embodiment, the reflection mirror assembly 3 further comprises an intermediate vision reflection lens group 32, which is arranged at the end of the darkroom shell 1 away from the general reflection lens 31, and the conversion lens 2 can form a near vision path with the eyepiece 11 after displacement, and the conversion lens 2 can form an intermediate vision path with the eyepiece 11 after displacement and reflection of the intermediate vision reflection lens group 32.

[0041] Since the near vision path is short, the conversion lens 2 and the general reflection lens 31 can directly image, without the need for other reflection lenses to guide the lengthened path, so that the imaging distance of the target reaches the 30cm of the near vision path. The intermediate vision path is longer, and in the case of not changing the overall length of the darkroom shell 1, the imaging distance of the target needs to be lengthened through multiple reflections of the intermediate vision reflection lens group 32 at the bottom. By controlling the distance between the components, the imaging distance of the target after the reflection of the target by the intermediate vision reflection lens group 32 reaches the 60cm of the intermediate vision path.

[0042] This method does not need to move the general reflection lens 31, but only needs to move the conversion lens 2, and the conversion lens 2 only needs to be arranged one, which reduces the cost of the equipment. In addition, after multiple reflections of the intermediate vision reflection lens group 32, not only the length standard of the intermediate vision path can be reached, but also the length or thickness of the darkroom shell 1 does not need to be increased, which reduces the volume of the equipment and improves the integration of the equipment.

[0043] The displacement method of the conversion lens 2 includes at least one of translation or rotation, so as to achieve different switching effects through translation, rotation, or a combination of the two.

[0044] Further, the inside of the darkroom shell 1 is provided with a partition plate 12, the conversion lens 2 can rotate relative to the partition plate 12, the intermediate vision reflection lens group 32 comprises a first lens 321 and a second lens 322, and the imaging node of the target on the target screen 5 on the intermediate vision path passes through the first lens 321, the second lens 322, the general reflection lens 31 and the eyepiece 11 in sequence.

[0045] When the near vision detection is carried out, the conversion lens 2 is rotated to be parallel to the general reflection lens 31, at this time, the target on the target screen 5 can be directly imaged on the conversion lens 2, and the target is directly imaged to the eyepiece 11 through the reflection of the general reflection lens 31. When the intermediate vision detection is carried out, the conversion lens 2 is rotated to be parallel to the first lens 321, the target on the target screen 5 is directly imaged on the conversion lens 2, the second lens 322 is symmetrically arranged with the first lens 321, so that the light of the target can be reflected to the general reflection lens 31 through the reflection of the first lens 321 and the second lens 322, thereby increasing the imaging path and changing the direction of the light. Through the above arrangement, the near vision detection system and the intermediate vision detection system can be switched by rotating the conversion lens 2, and the switching process is simple, stable and efficient.

[0046] The vision detection instrument further comprises a driving assembly 4, the driving assembly 4 comprises a driving motor 41, a transmission swing arm 42 and two induction switches 43, the conversion lens 2 is in transmission connection with the driving motor 41 through the transmission swing arm 42, and the conversion lens 2 can be driven to rotate by the driving motor 41.

[0047] In order to ensure that the conversion lens 2 in the inside of the darkroom shell 1 can be executed according to the design scheme in the conversion process of the intermediate vision and the near vision detection instrument, a position sensing device is additionally designed on the basis of the position sensor in the driving motor 41. The device comprises a magnet installed on the transmission swing arm 42 and two corresponding induction switches 43. The driving motor 41 drives the conversion lens 2 to swing left and right through the transmission swing arm 42, so as to switch the near vision detection system and the intermediate vision detection system. The two induction switches 43 are arranged on the swing path of the transmission swing arm 42, when the transmission swing arm 42 triggers the corresponding induction switch 43, the induction switch 43 transmits a signal to the driving motor 41 and stops the rotation of the driving motor 41, so as to position the conversion lens 2, and therefore the two induction switches 43 correspond to two modes.

[0048] The induction switch 43 is a Hall switch, and the transmission swing arm 42 generates a magnetic field through the magnet and gives an induction signal to the Hall switch.

[0049] The Hall switch is an electronic device based on the Hall effect, which uses the influence of a magnetic field on an electric current to achieve the function of a switch. Since the Hall switch is a non-contact switch, it does not need to directly contact the controlled object or object. It operates by sensing a magnetic field, avoiding the problems of wear, corrosion or pollution caused by mechanical contact. The Hall switch has a fast response speed. It can almost instantly detect changes in the magnetic field and produce corresponding output, improving the response speed of the detection instrument when switching the detection system. The output signal of the Hall switch is very sensitive and stable to the change of the magnetic field. It can provide accurate magnetic field detection and measurement results, and has good repeatability and stability, so that the imaging distance of the test chart can be accurately positioned to 30 cm or 60 cm after the rotating switching system of the conversion lens 2.

[0050] In one embodiment, the vision detection instrument is provided with a control lever. When the patient observes the internal test chart through the eyepiece 11, the control lever is used to select the direction of the observed test chart and give a selection signal. In addition, language recognition can also be used for control and give a selection signal.

[0051] The eyepiece 11 has two viewfinders, each of which is provided with an eye shield 6, and each eye shield 6 can be controlled independently. When testing the right eye vision, the left eye shield 6 is closed and the right eye shield 6 is opened; when testing the left eye vision, the right eye shield 6 is closed and the left eye shield 6 is opened; when testing the binocular vision, both eye shields 6 are opened. While realizing the self-test of the measured person's intermediate vision and near vision of the right eye, left eye and both eyes, the artificial cost caused by the on-site prompting of the medical staff to shield the eyes is effectively reduced.

[0052] An identity recognition device such as a code scanner or a card induction area is provided on the vision detection instrument. The code scanner is used for two-dimensional code scanning for identity recognition, and the card induction area is used for identity recognition by induction of identity cards, medical cards, social security cards, etc. After the test is completed, the data is automatically stored, and the test results can be automatically printed by the printer provided on the instrument. Data transmission can also be realized through RS232 and wireless network to be connected to the hospital system. The artificial cost caused by the medical staff's copying of data is reduced, and problems such as data errors are avoided. Through the collection, management and analysis of vision data, the service of the medical staff to the measured person is more convenient.

[0053] A distance sensor is provided near the eyepiece 11 to give a signal to start the test when the head is close.

[0054] Further, the specific implementation method of the embodiment is given: when "intermediate visual acuity" is selected on the display screen, the driving motor 41 receives the instruction to rotate, the transmission swing arm 42 installed on the driving motor 41 rotates to the position corresponding to the inductive switch 43, the optotypes on the optotype screen 5 pass through the conversion lens 2, the first lens 321, the second lens 322, the general reflecting lens 31 and the eyepiece 11 in turn, and the overall length of the imaging path is 60 cm. The eyes of the measured person can enter the test link through the eyepiece 11. When "near visual acuity" is selected on the display screen, the driving motor 41 receives the instruction to rotate, the transmission swing arm 42 installed on the driving motor 41 rotates to another inductive switch 43, the optotypes on the optotype screen 5 pass through the conversion lens 2, the general reflecting lens 31 and the eyepiece 11 in turn, and the overall length of the imaging path is 30 cm. The medical staff avoids testing by visual distance, and eliminates the influence of inaccurate distance on the accuracy of test results. The structure is designed to realize the intelligent switching of the intermediate visual acuity and the near visual acuity on one instrument, and complete the dual-function test of the intermediate visual acuity and the near visual acuity.

[0055] The optotypes on the optotype screen 5 are single played, and the program sets the following detection steps: 1, the order of the appearance of the optotypes is random from large to small; 2, the directions of the adjacent two optotypes are different; 3, the optotype is increased by one level after reading error. The measured person gives the signal of the opening direction through the joy stick according to the opening direction of the optotype, avoids the measured person giving false visual acuity value through other ways (such as writing down the opening direction of the optotype, reminding of the companion with good visual acuity, etc.), and reduces the artificial cost brought by the on-site prompting of the medical staff.

[0056] The above content is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as the modifications or supplements do not deviate from the structure of the utility model or exceed the range defined by the present application, and should belong to the protection range of the utility model.

Claims

1. A vision tester comprising: The utility model relates to a kind of darkroom shell, the darkroom shell is provided with eyepiece in one end; Several conversion lenses are arranged inside the darkroom shell; The mirror assembly includes a general reflecting lens, which is arranged opposite to the eyepiece; The eyepiece and several conversion lenses can form a near vision path and an intermediate vision path for the imaging of the target on the conversion lens by the displacement of at least one of the conversion lens or the general reflecting lens. The inside of the darkroom shell is provided with a partition, and a near vision imaging chamber and an intermediate vision imaging chamber are formed by the partition. The conversion lens is provided with two, and the two conversion lenses are arranged in the near vision imaging chamber and the intermediate vision imaging chamber respectively. The general reflecting lens is in sliding connection with the darkroom shell.

2. A vision tester according to claim 1, wherein, The conversion lens is provided with one, and the general reflecting lens is in fixed connection with the darkroom shell. The conversion lens and the general reflecting lens can slide relative to each other. The conversion lens can form a near vision path and an intermediate vision path between the eyepiece by sliding.

3. The vision detector of claim 1, wherein The mirror assembly further includes an intermediate vision reflecting lens group. The intermediate vision reflecting lens group is arranged at one end of the darkroom shell away from the general reflecting lens. The conversion lens can form a near vision path between the eyepiece by displacement, and can form an intermediate vision path between the eyepiece by displacement and the reflection of the intermediate vision reflecting lens group.

4. The vision detector of claim 1, wherein The displacement method of the conversion lens includes at least one of translation or rotation.

5. A vision tester according to claim 4, wherein, The inside of the darkroom shell is provided with a partition, and the conversion lens can rotate relative to the partition. The intermediate vision reflecting lens group includes a first lens and a second lens. The imaging nodes of the target of the conversion lens on the intermediate vision path pass through the first lens, the second lens, the general reflecting lens, and the eyepiece in turn.

6. A vision tester according to claim 5, wherein, The utility model further includes a drive assembly, which includes a drive motor, a transmission swing arm, and two inductive switches. The conversion lens is in transmission connection with the drive motor through the transmission swing arm. The conversion lens can be driven to rotate by the drive motor. The two inductive switches are arranged on the rotation path of the transmission swing arm.

7. A vision tester according to claim 6, wherein The inductive switch is a Hall switch, and the transmission swing arm is provided with a magnet.

8. A vision tester according to claim 7, wherein, The utility model further includes a target screen, which is arranged opposite to the conversion lens.

9. A vision tester according to any one of claims 1 to 8, wherein, The utility model further includes an eye shield, which is arranged inside the eyepiece.

10. A vision tester according to any one of claims 1 to 8, wherein, ​

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