Binocular optometry device and binocular optometry system

Abstract

The utility model provides a binocular optometry device and a binocular optometry system. The binocular optometry device comprises a first eye optometry device and a second eye optometry device, and the first eye optometry device comprises an objective optometry module and a first subjective optometry module; the objective optometry module comprises a beacon light source and a wavefront sensor; the first subjective optometry module comprises a first positioning light source and a first spectroscope, light emitted by the first positioning light source can be reflected by the first spectroscope to form first emergent light, the first emergent light is emitted out of the first eye optometry device, and the first spectroscope is set to be first incident light which is emitted into the first eye optometry device in the reverse direction of the first emergent light and second incident light which is emitted into the second eye optometry device in the reverse direction of the first emergent light; the light can enter the wavefront measuring light path through the first spectroscope and is overlapped with the optical axis of the wavefront measuring light path in the wavefront measuring light path. According to the binocular optometry device and the binocular optometry system provided by the invention, the binocular optometry device and the binocular optometry system are closer to a real eye using environment during optometry, and can be compatible with far-distance sighting mark display devices of various specifications, so that more comprehensive optometry is facilitated.

Description

Technical Field

[0001] This application relates to the field of optometry technology, specifically to binocular optometry devices and binocular optometry systems. Background Technology

[0002] In related technologies, some optometry devices integrate a distance visual target display device to perform subjective refraction of the human eye's distance vision.

[0003] When performing subjective refraction of distance vision, the distance target display device usually needs to be 3-5 meters away from the human eye. However, the distance target display device integrated into the refraction device is limited by the size of the refraction device, and usually requires lens refraction to change the position of the image to meet the refraction distance requirements of distance vision. Moreover, no natural light usually enters the refraction device. Therefore, when the human eye observes the distance target display device inside the refraction device, there is a difference from the actual visual environment. In addition, the distance target display device is located inside the refraction device, which makes it inconvenient to switch between different sizes of visual acuity charts and refraction distances, making it difficult to conduct a more comprehensive refraction. Utility Model Content

[0004] To at least partially solve the above-mentioned problems, according to a first aspect of this application, an embodiment of this application provides a binocular refraction device, comprising: a first eye refraction device and a second eye refraction device, the first eye refraction device and the second eye refraction device being symmetrically arranged, the first eye refraction device and the second eye refraction device having the same or different structures, the first eye refraction device and the second eye refraction device being used respectively to refraction the first eye and the second eye in a human eye, wherein the first eye refraction device includes an objective refraction module and a first subjective refraction module; the objective refraction module includes a beacon light source and a wavefront sensor, when the first eye refraction device performs objective refraction on the human eye, the light emitted by the beacon light source can reach the human eye through the beacon optical path and the wavefront measurement optical path. The fundus of the eye is reflected by the fundus of the human eye and then reaches the wavefront sensor through the wavefront measurement optical path to objectively measure the refractive error of the human eye; the first subjective refraction module includes a first positioning light source and a first beam splitter. The light emitted by the first positioning light source can be reflected by the first beam splitter to form a first outgoing light and be emitted out of the first eye refraction device, so as to locate the first distance target display device outside the first eye refraction device through the first outgoing light. The first distance target display device is used to measure the distance visual acuity of the first eye. The first beam splitter is set so that the first incident light that enters the first eye refraction device in the opposite direction of the first outgoing light can pass through the first beam splitter and enter the wavefront measurement optical path, and coincide with the optical axis of the wavefront measurement optical path.

[0005] In some embodiments, the second-eye refraction device includes a second subjective refraction module and a refractive correction module. The second subjective refraction module includes a second positioning light source and a second beam splitter. The light emitted by the second positioning light source can be reflected by the second beam splitter to form a second outgoing light and exit the second-eye refraction device, so as to locate a second distance target display device outside the second-eye refraction device through the second outgoing light. The second distance target display device is used to measure the distance visual acuity of the second eye and is the same as the first distance target display device. The refractive correction module is used to perform refractive correction on the second eye. The second beam splitter is configured such that the second incident light entering the second-eye refraction device in the opposite direction of the second outgoing light can pass through the second beam splitter and enter the refractive correction optical path of the refractive correction module, and coincide with the optical axis of the refractive correction optical path. The second-eye refraction device does not include an objective refraction module.

[0006] In some embodiments, the first subjective refraction module further includes a first reflector, wherein light emitted from the first positioning light source can be transmitted through the first beam splitter to the first reflector, reflected by the first reflector and returned to the first beam splitter, and then reflected by the first beam splitter into the wavefront measurement optical path, where it coincides with the optical axis of the wavefront measurement optical path; the second subjective refraction module further includes a second reflector, wherein light emitted from the second positioning light source can be transmitted through the second beam splitter to the second reflector, reflected by the second reflector and returned to the second beam splitter, and then reflected by the second beam splitter into the refractive correction optical path, where it coincides with the optical axis of the refractive correction optical path.

[0007] In some embodiments, the first eye refraction device further includes a first near optotype display device for measuring near visual acuity of the first eye, wherein the light emitted by the first near optotype display device can enter the wavefront measurement optical path and coincide with the optical axis of the wavefront measurement optical path; the second eye refraction device further includes a second near optotype display device for measuring near visual acuity of the second eye, wherein the light emitted by the second near optotype display device can enter the refractive correction optical path and coincide with the optical axis of the refractive correction optical path.

[0008] In some embodiments, a first near target display device is disposed on a first slider, the first slider being driven by a first lead screw to move the first near target display device in a direction parallel to the first emitted light; a second near target display device is disposed on a second slider, the second slider being driven by a second lead screw to move the second near target display device in a direction parallel to the second emitted light.

[0009] In some embodiments, the first eye refraction device further includes a third beam splitter disposed in the exit path of the first emitted light, the first emitted light being able to exit the first eye refraction device after being reflected by the third beam splitter; the first near target display device is positioned such that the first emitted light can partially pass through the third beam splitter to reach the first near target display device; the second eye refraction device further includes a fourth beam splitter disposed in the exit path of the second emitted light, the second emitted light being able to exit the second eye refraction device after being reflected by the fourth beam splitter; the second near target display device is positioned such that the second emitted light can partially pass through the fourth beam splitter to reach the second near target display device.

[0010] In some embodiments, the first-eye refraction device further includes a third reflector, which is movably disposed within the first-eye refraction device and is movable between a first distance visual acuity testing position and a first near visual acuity testing position. When the third reflector is in the first distance visual acuity testing position, the first emitted light is reflected by the third reflector and exits the first-eye refraction device. When the third reflector is in the first distance visual acuity testing position, the first emitted light does not pass through the third reflector and reaches the first near visual acuity target display device. The second-eye refraction device further includes a fourth reflector, which is movably disposed within the second-eye refraction device and is movable between a second distance visual acuity testing position and a second near visual acuity testing position. When the fourth reflector is in the second distance visual acuity testing position, the second emitted light is reflected by the fourth reflector and exits the second-eye refraction device. When the fourth reflector is in the second distance visual acuity testing position, the second emitted light does not pass through the fourth reflector and reaches the second near visual acuity target display device.

[0011] In some embodiments, the wavefront measurement optical path includes a first relay telescope, a first cylindrical mirror pair, a fifth beam splitter, and a second relay telescope. Light emitted from the beacon light source reaches the fifth beam splitter via the beacon optical path, is reflected by the fifth beam splitter, and then passes sequentially through the first cylindrical mirror pair and the first relay telescope to reach the fundus of the human eye. The light reflected from the fundus of the human eye passes sequentially through the first relay telescope and the first cylindrical mirror pair to reach the fifth beam splitter, and then passes through the fifth beam splitter and the second relay telescope to reach the wavefront sensor.

[0012] In some embodiments, the beacon optical path includes a collimating objective lens and a sixth beam splitter. Light emitted from the beacon light source passes through the collimating objective lens to the sixth beam splitter, is reflected by the sixth beam splitter, and then reaches the fifth beam splitter, where it is reflected to coincide with the optical axis of the wavefront measurement optical path. The first incident light, incident on the first eye refraction device in the opposite direction of the first outgoing light, can pass through the first beam splitter and the sixth beam splitter in sequence to reach the fifth beam splitter, where it is reflected to coincide with the optical axis of the wavefront measurement optical path. The refractive correction optical path includes a third relay telescope, a second cylindrical mirror pair, and a fifth reflecting mirror. The second incident light, incident on the second eye refraction device in the opposite direction of the second outgoing light, can pass through the second beam splitter to reach the fifth reflecting mirror, where it is reflected to coincide with the optical axis of the refractive correction optical path.

[0013] According to a second aspect of this application, embodiments of this application also provide a binocular refraction system. The binocular refraction system includes a refraction device provided in any embodiment of the first aspect of this application, a first distance target display device, and a second distance target display device. The images displayed by the first distance target display device and the second distance target display device are the same. Light emitted from a first positioning light source of the first eye refraction device can be projected onto the first distance target display device, and light emitted from a second positioning light source of the second eye refraction device can be projected onto the second distance target display device.

[0014] The binocular refraction device and binocular refraction system provided in the embodiments of this application are equipped with a positioning light source. The light emitted from the refraction device by the positioning light source serves as a positioning reference for the placement of the distance visual target display device. This allows the distance visual target display device to be placed outside the refraction device, enabling a more realistic visual environment during refraction. Furthermore, it is compatible with various specifications of distance visual target display devices, facilitating a more comprehensive refraction. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the binocular refraction device provided in an embodiment of this application.

[0017] The attached figures are labeled as follows:

[0018] 1. Beacon light source; 2. Collimating objective lens; 3. Sixth beam splitter; 4. Fifth beam splitter; 5. First cylindrical mirror pair; 6. First relay telescope; 7. First eye; 8. Second relay telescope; 9. Wavefront sensor; 10. First beam splitter; 11. Third beam splitter; 12. First near-field target display device; 13. First far-field target display device; 14. First positioning light source; 15. First reflector; 16. Fifth reflector; 17. Second cylindrical mirror pair; 18. Third relay telescope; 19. Second eye; 20. Second beam splitter; 21. Fourth beam splitter; 22. Second near-field target display device; 23. Second far-field target display device; 24. Second positioning light source; 25. Second reflector.

[0019] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0020] The preferred embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection claimed in this application.

[0021] The terms "first," "second," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0022] According to a first aspect of this application, embodiments of this application provide a binocular refraction device. For example... Figure 1 As shown, the binocular refraction device includes a first eye refraction device and a second eye refraction device. The first eye refraction device and the second eye refraction device are symmetrically arranged. In this application, the first eye refraction device and the second eye refraction device may have the same or different structures. The first eye refraction device and the second eye refraction device are used to refraction the first eye 7 and the second eye 19 in the human eye, respectively.

[0023] The first-eye refraction device includes an objective refraction module and a first subjective refraction module. The objective refraction module includes a beacon light source 1 and a wavefront sensor 9. When performing objective refraction on a human eye using the first-eye refraction device, the light emitted by the beacon light source 1 can reach the fundus of the human eye through the beacon optical path and the wavefront measurement optical path, and after being reflected by the fundus of the human eye, it reaches the wavefront sensor 9 through the wavefront measurement optical path to objectively measure the refractive error of the human eye. The first subjective refraction module includes a first positioning light source 14 and a first beam splitter 10. The light emitted by the first positioning light source 14 is reflected by the first beam splitter 10 to form a first outgoing light, which is then emitted from the first eye refraction device. This outgoing light is used to position the first distance target display device 13 outside the first eye refraction device. The first distance target display device 13 is used to measure the distance visual acuity of the first eye 7. The first beam splitter 10 is configured such that the first incident light entering the first eye refraction device in the opposite direction to the first outgoing light can pass through the first beam splitter 10 and enter the wavefront measurement optical path, coinciding with the optical axis of the wavefront measurement optical path. For example, the beacon light source 1 can be an infrared beacon light source; the first positioning light source 14 can be a laser diode (LD) light source. Laser diode light sources have high straightness, which facilitates positioning. It should be noted that distance visual acuity in this application refers to the ability of the human eye to see distant objects, typically the visual acuity at a distance of 5 meters or 3 meters. When the first-eye refraction device and the second-eye refraction device have the same structure, the first-eye refraction device and the second-eye refraction device can perform binocular refraction through the same principle; when the first-eye refraction device and the second-eye refraction device have different structures, the second-eye refraction device can perform binocular refraction through the same or different principle as the first-eye refraction device, for example, using a monocular refraction device known in related technologies as the second-eye refraction device to cooperate with the first-eye refraction device to perform binocular refraction.

[0024] The optometry device provided in the embodiments of this application has a first positioning light source 14 inside. The light emitted by the first positioning light source 14 from the first eye optometry device serves as a positioning reference for the setting position of the first distance target display device 13. This allows the first distance target display device 13 to be set outside the first eye optometry device, so that it can more closely approximate the real eye environment during optometry. It is also compatible with various specifications of distance target display devices, which facilitates a more comprehensive optometry.

[0025] Specifically, when positioning the first distance target display device 13 using the first positioning light source 14, the up-down and left-right positions of the first distance target display device 13 can be centered on the light spot of the positioning light source, and the front-back position of the first distance target display device 13 can be determined by measuring tape according to the refraction distance requirements.

[0026] In some embodiments, the second-eye refraction device includes a second subjective refraction module and a refractive correction module. The second subjective refraction module includes a second positioning light source 24 and a second beam splitter 20. The light emitted by the second positioning light source 24 can be reflected by the second beam splitter 20 to form a second outgoing light and exit the second-eye refraction device, so as to locate the second distance target display device 23 outside the second-eye refraction device using the second outgoing light. The second distance target display device 23 is used for measuring the distance visual acuity of the second eye 19 and is used in conjunction with the first distance target display device 13. Similarly, the refractive correction module is used to correct the refractive error of the second eye 19. The second beam splitter 20 is configured such that the second incident light entering the second eye refraction device in the opposite direction to the second outgoing light can pass through the second beam splitter 20 and enter the refractive correction optical path of the refractive correction module, coinciding with the optical axis of the refractive correction optical path. The refractive correction optical path can be the optical path formed by optical components in the refractive correction assembly used to correct the refractive power of the human eye (such as the third relay telescope 18 and the second cylindrical mirror pair 17 mentioned below). The second eye refraction device does not include an objective refraction module. In this embodiment, the second eye refraction device has a different structure from the first eye refraction device. Specifically, the objective refraction module is omitted in the second eye refraction device, reducing the cost of the binocular refraction device. In this case, the second eye 19 can be measured using the objective refraction module in the first eye refraction device. When performing an eye refraction test, the first eye refraction device can be moved to the position of the second eye 19 to achieve an objective refraction test of the second eye 19.

[0027] In some embodiments, the first subjective optometry module further includes a first reflector 15, whereby the light emitted by the first positioning light source 14 can be transmitted through the first beam splitter 10 to the first reflector 15, and after being reflected by the first reflector 15, return to the first beam splitter 10, and then be reflected by the first beam splitter 10 into the wavefront measurement optical path, where it coincides with the optical axis of the wavefront measurement optical path; the second subjective optometry module further includes a second reflector 25, whereby the light emitted by the second positioning light source 24 can be transmitted through the second beam splitter 20 to the second reflector 25, and after being reflected by the second reflector 25, return to the second beam splitter 20, and then be reflected by the second beam splitter 20 into the refractive correction optical path, where it coincides with the optical axis of the refractive correction optical path. In this embodiment, a first reflector 15 and a second reflector 25 are provided. During the assembly of the binocular refraction device, the first reflector 15 can be used to adjust the orientation of the first beam splitter 10 so that the light projected by the first distance target display device 13 after being positioned by the first positioning light source 14 can pass through the first beam splitter 10 and enter the wavefront measurement optical path, and coincide with the optical axis of the wavefront measurement optical path. The second reflector 25 can be used to adjust the orientation of the second beam splitter 20 so that the light projected by the second distance target display device 23 after being positioned by the second positioning light source 24 can pass through the second beam splitter 20 and enter the refractive correction optical path, and coincide with the optical axis of the refractive correction optical path.

[0028] In some embodiments, the first-eye refraction device further includes a first near-vision target display device 12, which is used to measure the near visual acuity of the first eye 7. The light emitted by the first near-vision target display device 12 can enter the wavefront measurement optical path and coincide with the optical axis of the wavefront measurement optical path. The second-eye refraction device further includes a second near-vision target display device 22, which is used to measure the near visual acuity of the second eye 19. The light emitted by the second near-vision target display device 22 can enter the refractive correction optical path and coincide with the optical axis of the refractive correction optical path. In this embodiment, by integrating the first near-vision target display device 12 and the second near-vision target display device 22 into the first-eye and second-eye refraction devices respectively, near visual acuity testing of the human eye can be performed, increasing the functionality of the refraction device and making the refraction process more convenient. It should be noted that near visual acuity in this application refers to the ability of the human eye to see near objects, typically the visual acuity at a distance of about 30-40cm.

[0029] In some embodiments, a first near-field target display device 12 is disposed on a first slider, which is driven by a first lead screw to move the first near-field target display device 12 in a direction parallel to the first emitted light; a second near-field target display device 22 is disposed on a second slider, which is driven by a second lead screw to move the second near-field target display device 22 in a direction parallel to the second emitted light. In this embodiment, the above structure enables the sliding of the first near-field target display device 12 and the second near-field target display device 22, allowing them to move along the optical axis for near vision detection at different distances. For example, the initial positions of the first near-field target display device 12 and the second near-field target display device 22 can be located 30-40 cm from their respective system exit pupil positions, such as 30 cm, 33 cm, 36 cm, 40 cm, etc.

[0030] In some embodiments, the first eye refraction device further includes a third beam splitter 11, which is disposed in the exit path of the first emitted light, and the first emitted light can be reflected by the third beam splitter 11 and exit the first eye refraction device; the first near target display device 12 is positioned such that the first emitted light can partially pass through the third beam splitter 11 to reach the first near target display device 12; the second eye refraction device further includes a fourth beam splitter 21, which is disposed in the exit path of the second emitted light, and the second emitted light can be reflected by the fourth beam splitter 21 and exit the second eye refraction device; the second near target display device 22 is positioned such that the second emitted light can partially pass through the fourth beam splitter 21 to reach the second near target display device 22. In this embodiment, for the first-eye refraction device, the switching between the first near-field target display device 12 and the first far-field target display device 13 is achieved through the third beam splitter 11. When the first far-field target display device 13 needs to be used, the first near-field target display device 12 can be turned off and the first far-field target display device 13 can be turned on. At this time, the human eye can only see the light reflected from the first far-field target display device 13 through the third beam splitter 11. When the first near-field target display device 12 needs to be used, the first far-field target display device 13 can be turned off and the first near-field target display device 12 can be turned on. At this time, the human eye can only see the light transmitted through the first near-field target display device 12 through the third beam splitter 11. In this embodiment, the switching between the first near-field target display device 12 and the first far-field target display device 13 is achieved through the third beam splitter 11, which has a simple structure and low cost. The same principle applies to the second-eye refraction device, and will not be described in detail here.

[0031] In some embodiments, the first-eye refraction device further includes a third reflector, which is movably disposed within the first-eye refraction device and can move between a first distance visual acuity testing position and a first near visual acuity testing position. When the third reflector is in the first distance visual acuity testing position, the first emitted light can be reflected by the third reflector and then emitted out of the first-eye refraction device. When the third reflector is in the first distance visual acuity testing position, the first emitted light does not pass through the third reflector and reaches the first near visual acuity target display device 12. The second-eye refraction device further includes a fourth reflector, which is movably disposed within the second-eye refraction device and can move between a second distance visual acuity testing position and a second near visual acuity testing position. When the fourth reflector is in the second distance visual acuity testing position, the second emitted light can be reflected by the fourth reflector and then emitted out of the second-eye refraction device. When the fourth reflector is in the second distance visual acuity testing position, the second emitted light does not pass through the fourth reflector and reaches the second near visual acuity target display device 22. In this embodiment, for the first-eye refraction device, switching between the first near-field target display device 12 and the first far-field target display device 13 is achieved by setting a movable third reflector, which avoids the light intensity loss caused by the third beam splitter 11 and improves the refraction accuracy. Exemplarily, in some embodiments, the third reflector is mounted on a third slider, which can be driven by a third lead screw to move the third reflector. Of course, in other embodiments, the movement of the third reflector can also be achieved through a turntable. In other embodiments, the third reflector can also be a foldable structure to achieve switching between the first near-field target display device 12 and the first far-field target display device 13. The same principle applies to the second-eye refraction device, and will not be elaborated further here.

[0032] In some embodiments, the wavefront measurement optical path includes a first relay telescope 6, a first cylindrical lens pair 5, a fifth beam splitter 4, and a second relay telescope 8. Light emitted from the beacon light source 1 travels through the beacon optical path to the fifth beam splitter 4, is reflected by the fifth beam splitter 4, and then sequentially passes through the first cylindrical lens pair 5 and the first relay telescope 6 to reach the fundus of the human eye. The light reflected from the fundus of the human eye sequentially passes through the first relay telescope 6 and the first cylindrical lens pair 5 to reach the fifth beam splitter 4, passes through the fifth beam splitter 4, and then passes through the second relay telescope 8 to reach the wavefront sensor 9. In this embodiment, the defocus of the human eye can be compensated by adjusting the spacing between the two lenses in the first relay telescope 6, and the astigmatism of the human eye can be compensated by the first cylindrical lens pair 5.

[0033] In some embodiments, the beacon optical path includes a collimating objective lens 2 and a sixth beam splitter 3. Light emitted from the beacon light source 1 passes through the collimating objective lens 2 to the sixth beam splitter 3, is reflected by the sixth beam splitter 3, and then reaches the fifth beam splitter 4, where it is reflected to coincide with the optical axis of the wavefront measurement optical path. The first incident light, incident in the first eye refraction device in the opposite direction to the first outgoing light, passes sequentially through the first beam splitter 10 and the sixth beam splitter 3 to reach the fifth beam splitter 4, where it is reflected to coincide with the optical axis of the wavefront measurement optical path. During objective refraction, the beacon light source 1 can be turned on. Light emitted from the beacon light source 1 is collimated by the collimating objective lens 2, then reflected by the sixth beam splitter 3 and the fifth beam splitter 4, passes through the first cylindrical mirror pair 5 and the first relay telescope 6, and enters the human eye. Light reflected from the fundus of the human eye passes through the first relay telescope 6, the first cylindrical mirror pair 5, the fifth beam splitter 4, and the second relay telescope 8, and enters the wavefront sensor 9 to objectively measure the refractive error of the human eye.

[0034] The refractive correction optical path includes a third relay telescope 18, a second cylindrical mirror pair 17, and a fifth reflecting mirror 16. The second incident light, which enters the second eye optometry device in the opposite direction of the second outgoing light, can pass through the second beam splitter 20 to reach the fifth reflecting mirror 16 and be reflected by the fifth reflecting mirror 16 to coincide with the optical axis of the refractive correction optical path. In this embodiment, the defocus of the human eye can be compensated by adjusting the interval between the two lenses in the third relay telescope 18, and the second cylindrical mirror pair 17 can compensate for the astigmatism of the human eye.

[0035] The workflow of the binocular refraction device provided in some embodiments of this application is as follows:

[0036] 1. Turn on the first positioning light source 14 and the second positioning light source 24 respectively. Determine the installation position (up / down and left / right) of the first remote target display device 13 based on the light spot after the first positioning light source 14 passes through the first beam splitter 10 and the third beam splitter 11. Determine the installation position (up / down and left / right) of the second remote target display device 23 based on the light spot after the second positioning light source 24 passes through the second beam splitter 20 and the fourth beam splitter 21. The relative positions of the first remote target display device 13 and the second remote target display device 23 with their respective corresponding light spots are the same. The front and back positions of the first remote target display device 13 and the second remote target display device 23 are determined by measuring tools such as a tape measure. The front and back positions of the first remote target display device 13 and the second remote target display device 23 are the same.

[0037] 2. When the beacon light source 1 is turned on, the light emitted by the beacon light source 1 is collimated by the collimating objective lens 2, reflected by the sixth beam splitter 3 and the fifth beam splitter 4, and enters the human eye after passing through the first cylindrical mirror pair 5 and the first relay telescope 6.

[0038] 3. The light reflected from the fundus of the human eye passes through the first relay telescope 6, the cylindrical mirror pair, the third beam splitter 11, and the second relay telescope 8 and enters the wavefront sensor 9 to objectively measure the refractive error of the human eye. Objective refraction is then performed on the first eye 7 and the second eye 19.

[0039] 4. Based on the measured refractive error of the human eye, the defocus of the human eye is compensated by moving the components within the large dashed frame; the single cylindrical mirrors centered around the cylindrical mirror are rotated around the optical axis to compensate for the astigmatism of the human eye.

[0040] 5. After the refractive error compensation of the human eye is completed, a specific type of optotype is displayed using either a distance optotype display device or a near optotype display device as needed for the scenario. Two distance optotype display devices or two near optotype display devices display the same optotype. Taking refraction using a distance optotype display device as an example, in the first eye refraction device, the human eye observes and judges the specific optotype displayed on the first distance optotype display device 13 through the first relay telescope 6, the first cylindrical mirror pair 5, the fifth beam splitter 4, the sixth beam splitter 3, the first beam splitter 10, and the third beam splitter 11. Based on subjective visual perception, the defocus size is finely adjusted, and the relative angle of the first cylindrical mirror pair 5 is rotated to finely adjust the synthesized astigmatism size and axis until the optimal corrected visual quality is obtained subjectively. The second eye refraction device follows the same principle and will not be elaborated further. Finally, the subjective refraction of the first eye 7 and the second eye 19 is completed.

[0041] According to a second aspect of this application, embodiments of this application also provide a binocular refraction system. The binocular refraction system includes a refraction device provided in any embodiment of the first aspect of this application, a first distance target display device, and a second distance target display device. The images displayed by the first distance target display device and the second distance target display device are the same. Light emitted from a first positioning light source of the first eye refraction device can be projected onto the first distance target display device, and light emitted from a second positioning light source of the second eye refraction device can be projected onto the second distance target display device.

[0042] Based on the various embodiments of this application described above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0043] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A binocular refraction device, characterized in that, include: A first eye refraction device and a second eye refraction device are symmetrically arranged. The first eye refraction device and the second eye refraction device have the same or different structures. The first eye refraction device and the second eye refraction device are used to refraction the first eye and the second eye in a human eye, respectively. The first eye refraction device includes an objective refraction module and a first subjective refraction module. The objective refraction module includes a beacon light source and a wavefront sensor. When the first eye refraction device performs objective refraction on the human eye, the light emitted by the beacon light source can reach the fundus of the human eye through the beacon optical path and the wavefront measurement optical path, and after being reflected by the fundus of the human eye, it reaches the wavefront sensor through the wavefront measurement optical path to objectively measure the refractive error of the human eye. The first subjective refraction module includes a first positioning light source and a first beam splitter. The light emitted by the first positioning light source can be reflected by the first beam splitter to form a first outgoing light and exit the first eye refraction device, so as to locate the first distance target display device outside the first eye refraction device through the first outgoing light. The first distance target display device is used to measure the distance vision of the first eye. The first beam splitter is configured such that the first incident light entering the first eye refraction device in the opposite direction of the first outgoing light can pass through the first beam splitter and enter the wavefront measurement optical path, and coincide with the optical axis of the wavefront measurement optical path.

2. The binocular refraction device according to claim 1, characterized in that, The second eye refraction device includes a second subjective refraction module and a refractive correction module. The second subjective refraction module includes a second positioning light source and a second beam splitter. The light emitted by the second positioning light source can be reflected by the second beam splitter to form a second outgoing light and exit the second eye refraction device. The second outgoing light is used to locate a second distance target display device outside the second eye refraction device. The second distance target display device is used to measure the distance visual acuity of the second eye and is the same as the first distance target display device. The refractive correction module is used to correct the refractive error of the second eye. The second beam splitter is configured such that the second incident light entering the second eye refraction device in the opposite direction of the second outgoing light can pass through the second beam splitter and enter the refractive correction optical path of the refractive correction module, and coincide with the optical axis of the refractive correction optical path. The objective refraction module is not provided in the second eye refraction device.

3. The binocular refraction device according to claim 2, characterized in that, The first subjective optometry module also includes a first reflector. The light emitted by the first positioning light source can be transmitted through the first beam splitter to the first reflector, and after being reflected by the first reflector, it returns to the first beam splitter. Then, it is reflected by the first beam splitter into the wavefront measurement optical path, and coincides with the optical axis of the wavefront measurement optical path. The second subjective optometry module also includes a second reflector. The light emitted by the second positioning light source can be transmitted through the second beam splitter to the second reflector, and after being reflected by the second reflector, it returns to the second beam splitter. Then, it is reflected by the second beam splitter into the refractive correction optical path, and coincides with the optical axis of the refractive correction optical path.

4. The binocular refraction device according to claim 2, characterized in that, The first eye optometry device also includes a first near vision target display device, which is used to measure the near vision of the first eye. The light emitted by the first near vision target display device can enter the wavefront measurement optical path and coincide with the optical axis of the wavefront measurement optical path. The second eye optometry device also includes a second near optotype display device, which is used to measure the near visual acuity of the second eye. The light emitted by the second near optotype display device can enter the refractive correction optical path and coincide with the optical axis of the refractive correction optical path.

5. The binocular refraction device according to claim 4, characterized in that, The first near-field target display device is mounted on the first slider, which can be driven by the first lead screw to move the first near-field target display device in a direction parallel to the first emitted light. The second near-field target display device is mounted on the second slider, which can be driven by the second lead screw to move the second near-field target display device in a direction parallel to the second emitted light.

6. The binocular refraction device according to claim 4, characterized in that, The first eye refraction device further includes a third beam splitter, which is disposed in the exit path of the first emitted light, and the first emitted light can be reflected by the third beam splitter and exit the first eye refraction device; the position of the first near target display device satisfies that the first emitted light can partially pass through the third beam splitter to reach the first near target display device. The second eye refraction device also includes a fourth beam splitter, which is disposed in the exit path of the second emitted light, and the second emitted light can be reflected by the fourth beam splitter and exit the second eye refraction device. The position of the second near-field target display device satisfies the condition that the second emitted light can partially pass through the fourth beam splitter to reach the second near-field target display device.

7. The binocular refraction device according to claim 4, characterized in that, The first eye refraction device also includes a third reflecting mirror, which is movably disposed in the first eye refraction device and is capable of moving between a first distance visual acuity testing position and a first near visual acuity testing position; When the third reflecting mirror is in the first distance vision detection position, the first emitted light can be reflected by the third reflecting mirror and then emitted out of the first eye optometry device. When the third reflector is in the first distance vision detection position, the first emitted light does not pass through the third reflector to reach the first near vision target display device; The second eye refraction device also includes a fourth reflecting mirror, which is movably disposed in the second eye refraction device and can move between a second distance visual acuity testing position and a second near visual acuity testing position; when the fourth reflecting mirror is in the second distance visual acuity testing position, the second emitted light can be reflected by the fourth reflecting mirror and then emitted out of the second eye refraction device. When the fourth reflector is in the second distance vision detection position, the second emitted light does not pass through the fourth reflector to reach the second near vision target display device.

8. The binocular refraction device according to claim 2, characterized in that, The wavefront measurement optical path includes a first relay telescope, a first cylindrical mirror pair, a fifth beam splitter, and a second relay telescope. The light emitted from the beacon light source reaches the fifth beam splitter via the beacon optical path, is reflected by the fifth beam splitter, and then passes sequentially through the first cylindrical mirror pair and the first relay telescope to reach the fundus of the human eye. The light reflected from the fundus of the human eye passes sequentially through the first relay telescope and the first cylindrical mirror pair to reach the fifth beam splitter, and then passes through the fifth beam splitter, through the second relay telescope, and reaches the wavefront sensor.

9. The binocular refraction device according to claim 8, characterized in that, The beacon optical path includes a collimating objective lens and a sixth beam splitter. The light emitted from the beacon light source passes through the collimating objective lens to the sixth beam splitter. After being reflected by the sixth beam splitter, the light reaches the fifth beam splitter and is reflected by the fifth beam splitter to coincide with the optical axis of the wavefront measurement optical path. The first incident light, which enters the first ophthalmic refraction device in the opposite direction of the first outgoing light, can pass through the first beam splitter and the sixth beam splitter in sequence to reach the fifth beam splitter and be reflected by the fifth beam splitter to coincide with the optical axis of the wavefront measurement optical path; The refractive correction optical path includes a third relay telescope, a second cylindrical mirror pair, and a fifth reflecting mirror. The second incident light, which enters the second ophthalmoscopy device in the opposite direction to the second outgoing light, can pass through the second beam splitter to reach the fifth reflecting mirror and be reflected by the fifth reflecting mirror to coincide with the optical axis of the refractive correction optical path.

10. A binocular refraction system, characterized in that, The device includes an optometry apparatus as described in any one of claims 1-9, a first distance target display device, and a second distance target display device, wherein the images displayed by the first distance target display device and the second distance target display device are the same, light emitted from the first positioning light source of the first eye optometry apparatus can be projected onto the first distance target display device, and light emitted from the second positioning light source of the second eye optometry apparatus can be projected onto the second distance target display device.

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