Ophthalmic optometry device

Abstract

The present invention discloses an ophthalmic optometry device, which relates to the technical field of ophthalmic examination, and comprises a main body, wherein a viewing hole is arranged on the main body, and a visual distance adjustment mechanism is installed on the main body outside the viewing hole, and the visual distance adjustment mechanism comprises a first cylinder and a second cylinder, wherein the first cylinder is fixedly installed on the main body outside the viewing hole, and the second cylinder is slidably installed in the first cylinder; when a patient performs optometry, the patient's eyes are aligned with the second cylinder, and the doctor pushes the second cylinder to slide to a suitable distance in the first cylinder, so that the distance between the patient's eyes and the viewing hole remains stable, and each patient can perform adaptive adjustment, so that the patient's optometry result is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of ophthalmic examination, in particular to an ophthalmic optometry device. Background Art

[0002] As is known, optometry is to check the convergence of light after it enters the eyeball. It uses the emmetropia state as the standard to measure the difference in convergence between the examined eye and the emmetropia eye. Since many people will almost certainly wear glasses in their lifetime, optometry is one of the most basic, most commonly used, and most important tasks for optometry workers. Optometry mainly checks the deformation of the eyeball. Generally, there are two methods. One is to use an instrument to check, which can preliminarily measure the deformation of the eyeball. The other is to use a lens trial, which is to wear a pair of glasses with interchangeable lenses to determine the degree of glasses to be worn, so that a pair of suitable glasses can be matched. When the patient undergoes optometry, the patient's corneal anterior vertex and the posterior vertex of the spectacle lens need to maintain a certain distance. Since the corneal anterior vertex and the comprehensive optometry measurement window, that is, the visual aperture, cannot maintain a fixed and nationally universal 12mm when the patient undergoes optometry with a comprehensive optometry instrument, there is a certain error in the patient's optometry result.

[0003] For example, the patent with publication number CN116984304A, publication date November 3, 2023, and name "A device for cleaning trial lenses for ophthalmic examination equipment" discloses a device for cleaning trial lenses for ophthalmic examination equipment, including an ultrasonic cleaner, a limiting groove is provided on the outer side of the ultrasonic cleaner, a driving mechanism is fixedly connected to the inside of the limiting groove, a clamping mechanism is arranged on the outer side of the driving mechanism, and a water removal and wiping mechanism is fixedly installed on the outer side of the clamping mechanism; since the surface of the trial lens body is coated with a waterproof layer and an oxide layer, when the trial lens body is cleaned by the ultrasonic cleaner, droplets will remain on its surface, and when the cleaning liquid on the water outlet head is flushed on the surface of the trial lens body, the droplets on the surface of the trial lens body can be taken away, and the surface of the trial lens body is free of droplets, so after the cleaning is completed, there is no need to wipe the trial lens body with a glasses cloth, so as to avoid the loss of the waterproof layer and the oxide layer on the trial lens body when the cleaning cloth is used to wipe the trial lens body, thereby increasing the service life of the trial lens body.

[0004] In the prior art, when using an optometry device to perform optometry on a patient's eyes, it is necessary to maintain a certain distance between the patient's eyes and the optic aperture of the optometry device (that is, the aperture when the patient's eyes are tested). Since the degree of tightness and angle of fit between the patient's face and the "bull's eye" of the comprehensive optometry instrument are different, there are differences in the distance between the patient's eyes and the optic aperture, resulting in inaccurate optometry results. Since the existing optometry device only has a lens-eye distance inspection window (that is, a reflector provided on the "bull's eye" of the comprehensive optometry instrument, and the doctor observes the distance between the patient and the optic aperture through the reflector) for the doctor to observe the distance between the patient and the optic aperture, this observation method is not clear and inconvenient, and since the distance between the patient and the optic aperture remains unstable, there are certain errors in the patient's optometry results. Summary of the invention

[0005] The object of the present invention is to provide an ophthalmic optometry device to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an ophthalmic optometry device, comprising a body, the body is provided with a viewing hole, a viewing distance adjustment mechanism is installed on the body outside the viewing hole, the viewing distance adjustment mechanism comprises a first cylinder and a second cylinder, the first cylinder is fixedly installed on the body outside the viewing hole, and the second cylinder is slidably installed in the first cylinder;

[0007] The second cylinder is located at one end inside the first cylinder and is provided with a hollow groove, in which an active ring is rotatably installed, and in which a plurality of closing plates are evenly arranged, and one end of each closing plate close to the inner wall of the viewing hole is rotatably installed on the hollow groove through a first pin shaft.

[0008] As mentioned above, scale values ​​are arranged on the outer walls of the first cylinder and the second cylinder, the first cylinder and the second cylinder are both made of transparent materials, and a camera is arranged on one side of the scale value on the main body.

[0009] As mentioned above, the first cylinder is a cylinder structure formed by a U-shaped frame enclosed on the side of the annular cylinder.

[0010] As mentioned above, a protruding push plate is formed on the outer side wall of the second cylinder, and the push plate is located in the U-shaped frame of the first cylinder.

[0011] As mentioned above, a lead screw is rotatably mounted on the U-shaped frame part of the main body located in the first cylinder, and one end of the lead screw is rotatably mounted on the main body, and the other end of the lead screw is rotatably mounted on the top of the U-shaped frame. The lead screw passes through the propulsion plate and is threadedly connected to the propulsion plate.

[0012] As mentioned above, a driven gear is installed on the portion of the lead screw located between the propulsion plate and the body.

[0013] As mentioned above, a driving member is installed on the main body, a driving gear is installed on the output end of the driving member, and the driving gear and the driven gear are meshed with each other.

[0014] As mentioned above, a sponge pad is provided at the end of the second cylinder.

[0015] As mentioned above, each of the closing plates is rotatably mounted with an arc rod at one end away from the inner wall of the viewing hole via a second pin shaft, and each of the arc rods is rotatably mounted on the active ring at one end close to the active ring via a third pin shaft.

[0016] As mentioned above, each of the closing plates is in the shape of a curved triangular plate, and each of the closing plates is combined with each other to form a circular plate.

[0017] The beneficial effect of the present invention is that when a patient undergoes optometry, the patient's eyes are aligned with the second cylinder, and the doctor pushes the second cylinder to slide to a suitable distance within the first cylinder, so that the distance between the patient's eyes and the optic aperture remains stable, and each patient can perform adaptive adjustments, making the patient's optometry results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A schematic diagram of a partial cross-sectional structure;

[0021] Figure 3 It is a schematic diagram of the internal partial three-dimensional structure of the first cylinder of the present invention;

[0022] Figure 4 A partial cross-sectional structural schematic diagram of another embodiment provided by the present invention;

[0023] Figure 5 It is a schematic diagram of the internal three-dimensional structure of the hollow groove of the present invention;

[0024] Figure 6 For the present invention Figure 5 A schematic diagram of the cross-sectional structure of;

[0025] Figure 7 For the present invention Figure 6 Schematic diagram of the locally enlarged cross-sectional structure at M.

[0026] Description of reference numerals:

[0027] 1. Main body; 2. Viewing hole; 3. First cylinder; 31. U-shaped frame; 32. Annular cylinder; 4. Second cylinder; 5. Propelling plate; 6. Lead screw; 7. Driven gear; 8. Driving member; 9. Active gear; 10. Hollow groove; 11. Active circular ring; 12. Closing plate; 13. First pin shaft; 14. Second pin shaft; 15. Arc rod; 16. Third pin shaft; 17. Arc surface through groove; 18. Arc surface rod; 19. Gear; 20. Columnar gear; 21. Slot; 22. Linear reciprocating motion mechanism; 23. Arc surface slide groove; 24. Elastic member; 25. Sponge pad; 26. Movable teeth. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] In each embodiment of the present invention, based on the convenience of description and understanding rather than limitation of rights, the orientation words in this embodiment: "center", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "lateral", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0030] like Figures 1 to 7 As shown, an ophthalmic optometry device provided by an embodiment of the present invention includes a main body 1, on which a viewing hole 2 is provided, and a visual distance adjustment mechanism is installed on the main body 1 outside the viewing hole 2, and the visual distance adjustment mechanism includes a first cylinder 3 and a second cylinder 4, and the first cylinder 3 is fixedly installed on the main body 1 outside the viewing hole 2, and the second cylinder 4 is slidably installed in the first cylinder 3.

[0031] Specifically, the body 1 is the main structure of the ophthalmometer, which is an instrument for comprehensively checking and evaluating the refractive state of the eye. The optic hole 2 is a detection hole on the body 1 for performing optometry on the patient, that is, the detection hole through which the tested eye is detected by the detection instrument (that is, the body 1). When the body 1 performs optometry on the patient, the patient's eyes and the optic hole 2 need to maintain a certain distance. Since the vision of the patients varies, the distance between the patient's eyes and the optic hole 2 is different when the patient is examined. Therefore, a device for adjusting the distance between the patient's eyes and the optic hole 2 is required. In the prior art, doctors rely on a reflector to actively remind the patient, which is obviously inconvenient. The embodiment of the present invention provides a visual distance adjustment mechanism for adjustment. The visual distance adjustment mechanism includes the first A barrel 3 and a second barrel 4, the first barrel 3 and the second barrel 4 are both cylindrical barrels, the middle of the first barrel 3 and the second barrel 4 are provided with inspection holes for the main body 1 to detect the patient's eyes, the first barrel 3 and the second barrel 4 are slidably sleeved, the outer walls of the first barrel 3 and the second barrel 4 are provided with scale values ​​(not shown in the figure), a camera (not shown in the figure) is provided on the main body 1 on one side of the scale value, the doctor can observe the change of the scale value through the display of the camera, and can know the distance between the first barrel 3 and the second barrel 4, so that the doctor can know the distance between the patient's eyes and the visual aperture 2 when adjusting the distance between the first barrel 3 and the second barrel 4, and a sponge is provided on the end of the second barrel 4 away from the main body 1 When the main body 1 performs optometry on the patient, the patient presses his eyes against the sponge pad 25 on the second cylinder 4, and the doctor adjusts the overall length of the first cylinder 3 and the second cylinder 4 so that the distance between the patient's eyes and the visual aperture 2 reaches the optimal distance (that is, the distance between the patient's eyes and the visual aperture 2 during optometry reaches the distance required for detection), thereby improving the accuracy of the patient's optometry results. In the prior art, when using an optometry device to perform optometry on the patient's eyes, it is necessary to keep a certain distance between the patient's eyes and the visual aperture 2 of the optometry device (that is, the hole for detecting the patient's eyes). Due to the different vision conditions of the patients, the distance between the patient's eyes and the visual aperture 2 varies. Since the existing optometry device only has an observation hole, the distance between the patient's eyes and the visual aperture 2 is different. The mirror (that is, a reflective mirror arranged on the optometry device, through which the doctor observes the distance between the patient and the optic hole 2) allows the doctor to observe the distance between the patient and the optic hole 2. This observation method is very inconvenient. Since the distance between the patient and the optic hole 2 remains unstable, there is a certain error in the patient's optometry result. In the present embodiment, when the patient is undergoing optometry, the patient's eyes are aligned with the second cylinder 4, and the doctor pushes the second cylinder 4 to slide to a suitable distance in the first cylinder 3, so that the distance between the patient's eyes and the optic hole 2 remains stable, and each patient can perform adaptive adjustment, so that the patient's optometry result is more accurate, and the distance between the patient's eyes and the optic hole 2 can be known without setting an observation mirror on the main body 1.

[0032] Furthermore, scale values ​​are set on the outer walls of the first barrel 3 and the second barrel 4, and a camera is set on one side of the scale values ​​on the main body 1. Specifically, the first barrel 3 and the second barrel 4 are both made of transparent materials (such as glass, transparent plastic, etc.), and a mechanism capable of adjusting the angle is set on the camera, so that the angle of the camera can be adjusted. The doctor can observe the distance between the corneal vertex and the lens through the camera display, and can observe the changes in the scale values ​​through the camera display, and can know the distance between the first barrel 3 and the second barrel 4, so that the main body 1 can make the patient's eye examination result more accurate.

[0033] Further, the first cylinder 3 is a cylinder structure formed by a U-shaped frame 31 enclosed in the side of the annular cylinder 32, that is, the arc structure of the annular cylinder 32 of the first cylinder 3 and the second cylinder 4 are slidably arranged with each other, the interior of the U-shaped frame 31 of the first cylinder 3 is a hollow structure, and a protruding propulsion plate 5 is formed on the outer wall of the second cylinder 4, and the propulsion plate 5 is located in the U-shaped frame 31 of the first cylinder 3; a lead screw 6 is rotatably installed on the U-shaped frame 31 part of the main body 1 located in the first cylinder 3, and one end of the lead screw 6 is rotatably installed on the main body 1, and the other end of the lead screw 6 is rotatably installed on the top of the U-shaped frame 31, the lead screw 6 passes through the propulsion plate 5 and is threadedly connected with the propulsion plate 5; a driven gear 7 is installed on the part of the lead screw 6 located between the propulsion plate 5 and the main body 1; a driving member 8 such as a micro motor is installed on the main body 1, and a driving gear 9 is installed on the output end of the driving member 8, and the driving gear 9 and the driven gear 7 are meshed with each other.

[0034] Specifically, when the doctor needs to adjust the distance between the first cylinder 3 and the second cylinder 4, that is, the second cylinder 4 slides in the first cylinder 3, when the second cylinder 4 needs to be driven to slide in the first cylinder 3, the driving member 8 is started (the driving member 8 is a device that can rotate clockwise and counterclockwise, preferably a forward and reverse motor) to drive the driving gear 9 to rotate clockwise, the driving gear 9 drives the driven gear 7 to rotate, the driven gear 7 drives the lead screw 6 to rotate, the lead screw 6 drives the push plate 5 to slide toward the end away from the main body 1 through threaded engagement, and the push plate 5 drives the second cylinder 4 to slide in the first cylinder 3 toward the end away from the main body 1. The spacing between the first barrel 3 and the second barrel 4 is increased, and the spacing between the patient's eye and the optic aperture 2 is increased; when the spacing between the patient's eye and the optic aperture 2 needs to be reduced, the driving member 8 is started to drive the driving gear 9 to rotate counterclockwise, the driving gear 9 drives the driven gear 7 to rotate, the driven gear 7 drives the lead screw 6 to rotate, the lead screw 6 drives the push plate 5 to slide toward the end close to the body 1 through threaded engagement, the push plate 5 drives the second barrel 4 to slide in the first barrel 3 toward the end close to the body 1, so that the spacing between the first barrel 3 and the second barrel 4 is reduced, and the spacing between the patient's eye and the optic aperture 2 is reduced.

[0035] In another embodiment provided by the present invention, a hollow groove 10 is provided at one end of the second cylinder 4 located inside the first cylinder 3, an active ring 11 is rotatably installed in the hollow groove 10, a plurality of closing plates 12 are evenly arranged in the hollow groove 10, one end of each closing plate 12 close to the inner wall of the viewing hole 2 is rotatably installed on the hollow groove 10 through a first pin shaft 13; an arc rod 15 is rotatably installed at one end of each closing plate 12 away from the inner wall of the viewing hole 2 through a second pin shaft 14, and one end of each arc rod 15 close to the active ring 11 is rotatably installed on the active ring 11 through a third pin shaft 16; each of the closing plates 12 is in the shape of an arc triangular plate, and each of the closing plates 12 is combined into a circular plate; a driving rod is provided on the outer wall of the active ring 11, and the driving rod is used to drive the active ring 11 to rotate.

[0036] Specifically, when a monocular examination of a patient is required, one eye of the patient needs to be covered while the other eye does not need to be covered. At this time, the driving rod drives the active ring 11 to rotate in the positive direction (i.e., clockwise), and the active ring 11 drives the arc rod 15 to move. The arc rod 15 drives the closing plate 12 to rotate around the first pin 13 (i.e., one end of the closing plate 12 is rotatably installed in the hollow groove 10 by the first pin 13, and the first pin 13 performs a certain rotational positioning on the closing plate 12, and the arc plate is pushed by the active ring 11 and the third pin 16, so that the arc plate pushes the closing plate 12 to rotate around the first pin 13 through the second pin 14), so that each closing plate The plate 12 rotates synchronously toward the center of the second cylinder 4. Since the closed plates 12 are combined into a circular plate, each closed plate 12 blocks the second cylinder 4 at the end that needs to be blocked by the patient, so that the patient can perform a monocular examination without closing his eyes. When the monocular examination is completed, the driving rod drives the active ring 11 to rotate in the opposite direction (i.e. counterclockwise), and the active ring 11 drives the arc rod 15 to move. The arc rod 15 drives the closed plate 12 to rotate around the first pin shaft 13, so that each closed plate 12 rotates synchronously toward the edge of the second cylinder 4, so that each closed plate 12 opens the second cylinder 4. In summary, when performing a monocular examination on the patient, the monocular examination can be achieved without the patient closing his eyes.

[0037] In another embodiment provided by the present invention, an arcuate through groove 17 is provided on the inner wall of the hollow groove 10 and on a side close to the driving gear 9, an arcuate rod 18 is provided on the side of the driving ring 11 close to the driving gear 9, and the arcuate rod 18 is slidably installed in the arcuate through groove 17, and a plurality of gear teeth 19 are evenly provided on the outer wall of the arcuate rod 18, a columnar gear 20 is rotatably installed between the main body 1 and the inner wall of the first cylinder 3, and the columnar gear 20 and the gear teeth 19 on the arcuate rod 18 are meshed with each other, the driving member 8 is no longer fixedly installed on the main body 1, a slot 21 is provided on the main body 1, and the driving member 8 is slidably installed in the slot 21, when the driving member 8 slides to one end in the slot 21, the driving gear 9 and the columnar gear 20 are meshed with each other, when the driving member 8 slides to the other end in the slot 21, the driving gear 9 and the driven gear 7 are meshed with each other, and the power for the driving member 8 to slide in the slot 21 is provided by the linear reciprocating motion mechanism 22.

[0038] Specifically, when the doctor needs to adjust the distance between the first barrel 3 and the second barrel 4, that is, when the second barrel 4 slides in the first barrel 3, the linear reciprocating motion mechanism 22 (that is, a mechanism capable of driving the driving member 8 to perform linear reciprocating motion in the slide groove, such as: a cylinder, an electric push rod, etc.) pushes the driving member 8 to slide in the slot 21 to the position where the driving gear 9 and the driven gear 7 are meshed with each other, and the driving member 8 is started to drive the driving gear 9 to rotate, and the driving gear 9 drives the driven gear 7 to rotate, and the driven gear 7 drives the lead screw 6 to rotate, and the lead screw 6 drives the push plate 5 to perform linear reciprocating motion through threaded meshing, and the push plate 5 drives the second barrel 4 to perform linear reciprocating motion in the first barrel 3, so that the distance between the first barrel 3 and the second barrel 4 can be adjusted, so that the distance between the patient's eye and the optic hole 2 can be adjusted, and due to the presence of the columnar gear 20, the columnar gear 20 and the gear teeth 19 on the arc surface rod 18 are always in a state of mutual meshing; when After the distance between the patient's eye and the optic aperture 2 is adjusted, and a monocular examination is required, the linear reciprocating motion mechanism 22 pushes the driving member 8 to slide in the slot 21 to the position where the active gear 9 and the cylindrical gear 20 are meshed with each other, and the driving member 8 is started to drive the active gear 9 to rotate, and the active gear 9 drives the cylindrical gear 20 to rotate. Since the cylindrical gear 20 and the gear teeth 19 on the arc surface rod 18 are meshed with each other, the cylindrical gear 20 drives the arc surface rod 18 to rotate in the arc surface groove 17 through the gear teeth 19, and the arc surface rod 18 drives the active circular ring 11 to rotate, and the active circular ring 11 drives the arc rod 15 to move, and the arc rod 15 drives the closing plate 12 to rotate around the first pin shaft 13, so that each closing plate 12 rotates synchronously toward the center of the second cylinder 4. Since each closing plate 12 is combined into a circular plate, each closing plate 12 blocks the second cylinder 4 at the end that the patient needs to block, so that the patient can perform a monocular examination without closing his eyes.

[0039] As a parallel scheme of another embodiment provided by the present invention, in another embodiment provided by the present invention, an arcuate groove 23 is opened on the outer wall of the arcuate rod 18 and at the position of the gear teeth 19 at the two ends, and the teeth at the two ends of the gear teeth 19 on the outer wall of the arcuate rod 18 are movable teeth 26, and the two movable teeth 26 are both slidably installed in the arcuate groove, and the movable teeth 26 at the two ends of the outer wall of the arcuate rod 18 and the inner wall of the corresponding arcuate groove 23 are connected by an elastic member 24. The difference from the aforementioned embodiment (that is, another embodiment provided by the present invention) is that: in this embodiment, the driving member 8 is fixedly mounted on the main body 1, and the driving gear 9 at the output end of the driving member 8 is simultaneously meshed with the columnar gear 20 and the driven gear 7.

[0040] Specifically, when the doctor needs to adjust the distance between the first barrel 3 and the second barrel 4, that is, when the second barrel 4 slides in the first barrel 3, the driving member 8 is started to drive the driving gear 9 to rotate clockwise, the driving gear 9 drives the driven gear 7 to rotate, the driven gear 7 drives the lead screw 6 to rotate, the lead screw 6 drives the push plate 5 to perform linear reciprocating motion through threaded engagement, the push plate 5 drives the second barrel 4 to perform linear reciprocating motion in the first barrel 3, the distance between the first barrel 3 and the second barrel 4 can be adjusted, so that the distance between the patient's eye and the optic hole 2 can be adjusted, and due to the presence of the columnar gear 20, the columnar gear 20 can be adjusted. The gear 20 and the gear teeth 19 on the arc surface rod 18 are always in a state of mutual meshing; at the same time, the driving gear 9 drives the column gear 20 to rotate. Since the column gear 20 and the gear teeth 19 on the arc surface rod 18 are meshed with each other, the column gear 20 drives the arc surface rod 18 to rotate in the arc surface groove 17 through the gear teeth 19 until the arc surface rod 18 is pressed against the inner wall of the arc surface groove 17. At this time, the arc surface rod 18 moves to the end of the stroke, and the movable teeth 26 on the outer wall of the column gear 20 and the arc surface rod 18 and located at one of the two ends are meshed with each other (through the movable teeth 26, the gear teeth 19 and the size of the column gear 20). The cylindrical gear 20 is designed so that the cylindrical gear 20 only abuts against the side of the movable teeth 26 away from the gear teeth 19, and when the cylindrical gear 20 is meshed and abutted with the movable teeth 26, the cylindrical gear 20 does not contact the gear teeth 19). Since the movable teeth 26 at the two ends of the outer wall of the arc surface rod 18 are slidably installed in the arc surface groove 23 and connected by the elastic member 24, the arc surface rod 18 is subjected to the pressing force of the arc surface groove 17, so that the cylindrical gear 20 drives the movable teeth 26 at one end of the two ends of the outer wall of the arc surface rod 18 to slide in the arc surface groove 23 and is subjected to the elastic member 24 (the elastic member 24 is capable of retracting and retracting). The resetting element, preferably a spring, squeezes and rebounds, so that the arc rod 18 no longer rotates, and the cylindrical gear 20 is in an idling state. In the above process, the arc rod 18 drives the active ring 11 to rotate a certain angle, so that the active ring 11 drives the arc rod 15 to move, and the arc rod 15 drives the closing plate 12 to rotate around the first pin 13, so that each closing plate 12 rotates synchronously toward the center of the second cylinder 4. Since each closing plate 12 is combined into a circular plate, each closing plate 12 blocks the second cylinder 4 at one end that the patient needs to block, so that the patient can perform a monocular examination without closing his eyes.However, when the patient does not need to undergo a monocular examination, the driving member 8 is started to drive the active gear 9 to rotate counterclockwise, the active gear 9 drives the cylindrical gear 20 to rotate, the cylindrical gear 20 drives the arc surface rod 18 to rotate through the movable teeth 26 and the gear teeth 19, the arc surface rod 18 drives the active ring 11 to rotate, the active ring 11 drives the arc rod 15 to move, the arc rod 15 drives the closing plate 12 to rotate around the first pin 13, so that each closing plate 12 rotates synchronously toward the edge of the second cylinder 4, so that each closing plate 12 opens the second cylinder 4. 4. Since the rotation angle of the active ring 11 is small, the spacing between the first cylinder 3 and the second cylinder 4 is adjusted to be small, which will not affect the distance between the patient's eyes and the optic aperture 2, and a sponge pad 25 is provided at the end of the second cylinder 4. The patient can reduce or increase the squeezing of the sponge pad 25 to reduce the influence of the cylindrical gear 20, the arc surface rod 18, the active ring 11 and each closing plate 12 on the spacing between the first cylinder 3 and the second cylinder 4 when opening the second cylinder 4, thereby improving the accuracy of the patient's optometry results. ;

[0041] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An ophthalmic optometry device, comprising a body, wherein the body is provided with a viewing hole, characterized in that: A sight distance adjustment mechanism is installed on the main body outside the sight hole, and the sight distance adjustment mechanism includes a first cylinder and a second cylinder. The first cylinder is fixedly installed on the main body outside the sight hole, and the second cylinder is slidably installed in the first cylinder. The second cylinder is located at one end of the first cylinder and has a hollow groove, an active ring is rotatably installed in the hollow groove, and a plurality of closing plates are evenly arranged in the hollow groove, and one end of each closing plate close to the inner wall of the viewing hole is rotatably installed on the hollow groove through a first pin shaft; The outer walls of the first cylinder and the second cylinder are provided with scale values, the first cylinder and the second cylinder are both made of transparent materials, and a camera is provided on one side of the scale value on the main body; Each of the closing plates has an end away from the inner wall of the viewing hole rotatably mounted with an arc rod through a second pin shaft, and each of the arc rods has an end close to the active circular ring rotatably mounted on the active circular ring through a third pin shaft; Each of the closing plates is in the shape of a curved triangular plate, and each of the closing plates is combined with each other to form a circular plate.

2. An ophthalmic optometry device according to claim 1, characterized in that: The first cylinder is a cylinder structure formed by a U-shaped frame enclosed on the side of the annular cylinder.

3. An ophthalmic optometry device according to claim 2, characterized in that: A protruding push plate is formed on the outer wall of the second cylinder, and the propelling plate is located in the U-shaped frame of the first cylinder.

4. An ophthalmic optometry device according to claim 3, characterized in that: A lead screw is rotatably mounted on the U-shaped frame portion of the main body located in the first cylinder, and one end of the lead screw is rotatably mounted on the main body, and the other end of the lead screw is rotatably mounted on the top of the U-shaped frame. The lead screw passes through the propulsion plate and is threadedly connected to the propulsion plate.

5. An ophthalmic optometry device according to claim 4, characterized in that: A driven gear is installed on the part of the lead screw located between the propulsion plate and the body.

6. An ophthalmic optometry device according to claim 5, characterized in that: A driving member is installed on the main body, a driving gear is installed on the output end of the driving member, and the driving gear and the driven gear are meshed with each other.

7. An ophthalmic optometry device according to claim 1, characterized in that: A sponge pad is disposed at the end of the second cylinder.

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