Optometry device and binocular optometry device

Abstract

The utility model provides an optometry device. The optometry device comprises an objective optometry module and a subjective optometry module. The objective optometry module comprises a beacon light source and a wavefront sensor, when objective optometry is carried out on the human eyes through the optometry device, light emitted by the beacon light source can reach the fundus of the human eyes through a beacon light path and a wavefront measurement light path, and the light is reflected by the fundus of the human eyes and then reaches the wavefront sensor through the wavefront measurement light path, so that the refractive error of the human eyes is objectively measured; the subjective optometry module comprises a sighting target display device and a sighting target objective lens, the sighting target objective lens is movably arranged in the optometry device, the sighting target objective lens can move in and out of a sighting target light path, and when the sighting target objective lens is located in the sighting target light path, the sighting target display device can be located on the focal plane of the sighting target objective lens. According to the optometry device and the binocular optometry device provided by the invention, in the optometry process in which far vision and near vision of human eyes need to be measured at the same time, the number of used equipment can be reduced, the operation steps are simplified, and the optometry time is shortened.

Description

Technical Field

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

[0002] Positive relative accommodation (PRA) / negative relative accommodation (NRA) measures the ability of the tested eye to enhance and relax accommodation while maintaining normal binocular fusion. The PRA / NRA test is part of visual function testing and is routinely used in presbyopia correction. It is also a standard measurement for individuals who complain of visual fatigue during near work. Furthermore, PRA / NRA measurements are valuable for myopia prevention. Specifically, a low PRA indicates insufficient accommodation, lack of accommodation persistence, or inability to produce effective accommodation. This can lead to accelerated myopia development in children and adolescents, and visual fatigue in adults. A low NRA indicates an inability to relax accommodation, potentially indicating accommodative spasm, over-accommodation, or pseudomyopia. In such cases, refraction can easily lead to overcorrection of myopia.

[0003] In related technologies, during PRA / NRA testing, objective refraction of both eyes is first performed using a computerized refractometer. Then, lenses with the appropriate distance refractive power are inserted into a trial frame, and the subject wears the trial frame. Subjective refraction is then performed using a distance optotype display device at a distance of 3-5 meters, adjusting the lenses to achieve optimal visual acuity. Further, a near optotype display device is placed 30-40 cm in front of the subject, guiding them to focus on one or two lines above their best visual acuity on a near vision chart. The process involves first determining the visual acuity of the target; then performing NRA (Near Visual Acuity Detection), simultaneously increasing the positive lens power in the trial frame for both eyes (at an increment of +0.25D) until the patient first reports persistent blurred vision of the target (first time means the patient notices the target is blurred but can still read it), and recording the total positive increase. Next, the power in the phoropter is readjusted to the initial power, and PRA (Peripheral Visual Acuity Detection) begins, which involves simultaneously increasing the negative lens power in the trial frame for both eyes (at an increment of -0.25D) until the patient first reports persistent blurred vision of the target, and recording the total negative increase. It is evident that PRA / NRA tests and other refraction procedures requiring simultaneous measurement of both distance and near visual acuity rely on multiple devices, are cumbersome, and time-consuming. Utility Model Content

[0004] To at least partially solve the above problems, according to the first aspect of this application, an embodiment of this application provides an optometry device, which includes an objective optometry module and a subjective optometry module. The objective optometry module includes a beacon light source and a wavefront sensor. When performing objective optometry on a human eye through the optometry device, 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 subjective optometry module includes a target display device and a target objective lens. The light emitted by the target display device can enter the wavefront measurement optical path through the target optical path and coincide with the optical axis of the wavefront measurement optical path. The target objective lens is movably disposed in the optometry device and can move into and out of the target optical path. When the target objective lens is located in the target optical path, the target display device can be located on the focal plane of the target objective lens.

[0005] In some embodiments, the target objective is disposed on a first slider, which can be driven by a first lead screw to move the target objective into and out of the target optical path.

[0006] In some embodiments, the target objective lens is disposed on a turntable, the plane of which is perpendicular to the optical axis of the target optical path, and through holes are provided at different positions around the turntable than the target objective lens. When the turntable rotates, the through holes can move onto the target optical path.

[0007] In some embodiments, the target display device is movably disposed in the optometry device, and the direction of movement of the target display device is parallel to the optical axis of the target optical path.

[0008] In some embodiments, the optical axis of the target optical path is perpendicular to the optical axis of the wavefront measurement optical path.

[0009] In some embodiments, the target display device is disposed on the second slider, which can be driven by the second lead screw to move the target display device along the optical axis perpendicular to the wavefront measurement optical path.

[0010] In some embodiments, the measurement optical path includes a first relay telescope, a pair of cylindrical mirrors, a first beam splitter, and a second relay telescope. Light emitted from the beacon light source reaches the first beam splitter via the beacon optical path, is reflected by the first beam splitter, and then passes sequentially through the pair of cylindrical mirrors and the first relay telescope to reach the fundus of the human eye. Light reflected from the fundus of the human eye passes sequentially through the first relay telescope and the pair of cylindrical mirrors to reach the first beam splitter, and then passes through the first beam splitter and the second relay telescope to reach the wavefront sensor.

[0011] In some embodiments, the beacon optical path includes a collimating objective lens and a second beam splitter. Light emitted from the beacon light source passes through the collimating objective lens to the second beam splitter, is reflected by the second beam splitter, reaches the first beam splitter, and is reflected by the first beam splitter to coincide with the optical axis of the wavefront measurement optical path. Light emitted from the beacon display device can pass through the second beam splitter to reach the first beam splitter and be reflected by the first beam splitter to coincide with the optical axis of the wavefront measurement optical path.

[0012] According to a second aspect of this application, embodiments of this application also provide a binocular refraction device, comprising two refraction devices as provided in any embodiment of the first aspect of this application, the two refraction devices being symmetrically arranged.

[0013] The optometry device and binocular optometry device provided in the embodiments of this application, by setting a movable optotype objective lens, allow the optotype display device to be positioned on the focal plane of the optotype objective lens when the optotype objective lens is located in the optotype optical path. By changing the distance between the image of the optotype display device and the human eye through the optotype objective lens, the optotype display device can be used as a distance optotype display device for measuring human distance visual acuity. When the optotype objective lens is located outside the optotype optical path, the light projected by the optotype display device can reach the human eye without passing through the optotype objective lens. In this case, the optotype display device can be used as a near optotype display device for measuring human near visual acuity. Therefore, the optometry device and binocular optometry device provided in the embodiments of this application can reduce the number of devices used, simplify the operation steps, and shorten the optometry time in optometry processes that require simultaneous measurement of human distance and near visual acuity (such as PRA / NRA tests). Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the optometry device provided in an embodiment of this application;

[0016] Figure 2 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. Second beam splitter; 4. First beam splitter; 5. Cylindrical mirror pair; 6. First relay telescope; 7. Human eye; 8. Second relay telescope; 9. Wavefront sensor; 10. Target objective lens; 11. Target display device.

[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] like Figure 1 As shown, according to a first aspect of this application, an embodiment of this application provides an optometry device. The optometry device includes an objective optometry module and a subjective optometry module. The objective optometry module is used to perform objective optometry on the human eye, and the subjective optometry module is used to perform subjective optometry (also known as subjective refraction) on the human eye.

[0023] The objective refraction module includes a beacon light source 1 and a wavefront sensor 9. When performing objective refraction on the human eye 7 using the refraction device, the light emitted from the beacon light source 1 can reach the fundus of the human eye 7 through the beacon optical path and the wavefront measurement optical path. After being reflected from the fundus of the human eye 7, it reaches the wavefront sensor 9 through the wavefront measurement optical path to objectively measure the refractive error of the human eye 7. In this application, objective refraction is achieved through Hartmann wavefront measurement.

[0024] The subjective refraction module includes a target display device 11 and a target objective lens 10. Light emitted from the target display device 11 can enter the wavefront measurement optical path through the target optical path and coincide with the optical axis of the wavefront measurement optical path. The target objective lens 10 is movably disposed in the refraction device and can move in and out of the target optical path. When the target objective lens 10 is located in the target optical path, the target display device 11 can be located on the focal plane of the target objective lens 10. In this embodiment, the target optical path refers to the optical path between the target display device 11 and the wavefront measurement optical path. The light emitted by the target display device 11 can reach the human eye 7 through the target optical path and the wavefront measurement optical path to achieve subjective refraction of the human eye 7. The optotype objective lens 10 can be a convex lens. When the optotype display device 11 is located on the focal plane of the optotype objective lens 10, it is equivalent to the human eye 7 looking at an optotype at infinity. Based on the relationship between the viewing angle and visual acuity, optotypes of different sizes can be designed to correspond to the effect of refraction using the current 5m (or 3m) visual acuity chart, thereby realizing the measurement of distance visual acuity. After moving the optotype objective lens 10 out of the optotype optical path, the distance between the image formed by the optotype display device 11 and the human eye 7 becomes smaller. By reasonably setting the position of the optotype display device 11, near visual acuity can be measured.

[0025] The optometry device and binocular optometry device provided in the embodiments of this application, by setting a movable optotype objective lens 10, allow the optotype display device 11 to be located on the focal plane of the optotype objective lens 10 when the optotype objective lens 10 is in the optotype optical path. In this case, the optotype display device 11 can be used as a distance optotype display device for measuring the distance visual acuity of the human eye 7. When the optotype objective lens 10 is outside the optotype optical path, the light projected by the optotype display device 11 can reach the human eye 7 without passing through the optotype objective lens 10. In this case, the optotype display device 11 can be used as a near optotype display device for measuring the near visual acuity of the human eye 7. Therefore, the optometry device and binocular optometry device provided in the embodiments of this application can reduce the number of devices used, simplify the operation steps, and shorten the optometry time in optometry processes that require simultaneous measurement of distance and near visual acuity of the human eye 7 (such as PRA / NRA tests).

[0026] In some embodiments, the target lens 10 is disposed on a first slider, which is driven by a first lead screw to move the target lens 10 into and out of the target optical path. In this embodiment, the movement of the target lens 10 is achieved through a slider and lead screw structure, facilitating position control of the target lens 10. In some embodiments, the optometry device may further include a position sensor (e.g., a proximity switch), which may be disposed on the target display device 11. When the target lens 10 moves into the target optical path, the position sensor is triggered, generating a signal that causes the first lead screw to stop rotating, thus keeping the first slider in its current position.

[0027] In some embodiments, the target objective 10 is disposed on a turntable, the plane of which is perpendicular to the optical axis of the target optical path. Through holes are also provided at positions on the circumference of the turntable different from those of the target objective 10. When the turntable rotates, the through holes can move onto the target optical path. In this embodiment, the movement of the target objective 10 is achieved through the above structure, which is simple in structure, low in cost, and also helps to control the size of the optometry device.

[0028] In some embodiments, the target display device 11 is movably disposed in the optometry device, and the direction of movement of the target display device 11 is parallel to the optical axis of the target optical path. In this embodiment, the target display device 11 has the functions of near and far targets. However, the distance requirements between the image formed by the near target and the human eye 7 are different for near and far targets (the distance requirement for near targets is usually 30-40cm, and the distance requirement for far targets is usually 3-5m). Although the above requirements can be achieved by a movable target objective lens 10, it requires high optical design. Therefore, in this embodiment, the target display device 11 is set to be movable along the optical axis of the target optical path. This makes it easier to adjust the target display device 11 to the focal plane position of the target objective lens 10 and to adjust the target display device 11 to the required distance of 30-40cm from the human eye 7, thereby reducing the design difficulty of the optometry device. Preferably, in some embodiments, the optical axis of the target optical path is perpendicular to the optical axis of the wavefront measurement optical path, thereby facilitating the placement of the first beam splitter 4 in the wavefront measurement optical path. In some embodiments, the target display device 11 is disposed on a second slider, which can be driven by a second lead screw to move the target display device 11 in a direction perpendicular to the optical axis of the wavefront measurement optical path.

[0029] In some embodiments, the measurement optical path includes a first relay telescope 6, a pair of cylindrical mirrors 5, a first beam splitter 4, and a second relay telescope 8. The light emitted from the beacon light source 1 reaches the first beam splitter 4 via the beacon optical path, is reflected by the first beam splitter 4, and then passes sequentially through the pair of cylindrical mirrors 5 and the first relay telescope 6 to reach the fundus of the human eye 7. The light reflected from the fundus of the human eye 7 passes sequentially through the first relay telescope 6 and the pair of cylindrical mirrors 5 to reach the first beam splitter 4, and then passes through the first beam splitter 4 and the second relay telescope 8 to reach the wavefront sensor 9. In this embodiment, the first relay telescope 6 can correct the defocus of the human eye 7, and the cylindrical lens pair 5 can correct the astigmatism of the human eye 7. By integrating the first relay telescope 6 and the cylindrical lens pair 5 into the optometry device, the use of an optometry trial frame can be avoided, simplifying the steps of inserting lenses into the optometry trial frame. Only the distance between the two lenses in the first relay telescope 6 and the deflection angle of the cylindrical lens pair 5 need to be adjusted to change the refractive correction power, thereby further improving the convenience of PRA / NRA testing.

[0030] In some embodiments, the beacon optical path includes a collimating objective lens 2 and a second beam splitter 3. Light emitted from the beacon light source 1 passes through the collimating objective lens 2, reaches the second beam splitter 3, is reflected by the second beam splitter 3, and then reaches the first beam splitter 4, where it is reflected to coincide with the optical axis of the wavefront measurement optical path. Light emitted from the optotype display device 11 can pass through the second beam splitter 3, reach the first beam splitter 4, and be reflected by the first beam splitter 4 to coincide with the optical axis of the wavefront measurement optical path. In this embodiment, the optotype optical path and the beacon optical path partially overlap, thereby reducing the number of optical components and further simplifying the internal structure of the optometry device.

[0031] like Figure 2 As shown, according to a second aspect of this application, embodiments of this application also provide a binocular refraction device, comprising two refraction devices as provided in any embodiment of the first aspect of this application. The two refraction devices are symmetrically arranged, and their structures can be mirror-symmetrical. The binocular refraction device is capable of simultaneously refractioning both eyes.

[0032] Taking the PRA / NRA test as an example, the process of using the binocular refraction device provided in the embodiments of this application can be as follows:

[0033] 1. Turn on the target display device 11 and display the far-field optometry target. Move the target objective lens 10 into the target optical path. The human eye 7 looks at the target displayed on the target display device 11 through the first relay telescope 6, cylindrical mirror pair 5, first beam splitter 4, second beam splitter 3, and target objective lens 10.

[0034] 2. Turn on the beacon light source 1. The light emitted by the beacon light source 1 is collimated by the collimating objective lens 2, reflected by the second beam splitter 3 and the first beam splitter 4, and enters the human eye 7 after passing through the cylindrical mirror pair 5 and the first relay telescope 6.

[0035] 3. The light reflected from the fundus of the human eye 7 passes through the first relay telescope 6, the cylindrical mirror pair 5, the first beam splitter 4, and the second relay telescope 8 and enters the wavefront sensor 9 to objectively examine the refractive error of the human eye 7.

[0036] 4. Based on the measured refractive error of the human eye 7, the defocus of the human eye 7 is compensated by moving the components within the large dashed frame; the astigmatism of the human eye 7 is compensated by rotating the single cylindrical mirror in the cylindrical mirror pair 5 around the optical axis.

[0037] 5. After the refractive error compensation of the human eye 7 is completed, the optotype display device 11 displays a specific type of optotype. The human eye 7 observes and judges the specific optotype displayed on the optotype display device 11 through the first relay telescope 6, cylindrical mirror pair 5, first beam splitter 4, second beam splitter 3 and optotype objective lens 10. Based on subjective visual perception, the defocus size is finely adjusted, and the relative angle of the cylindrical mirror pair 5 is rotated to finely adjust the synthesized astigmatism size and axis until the best subjective corrected visual quality is obtained, thus completing the monocular subjective refraction.

[0038] 6. After the subjective refraction of the left and right eyes is completed, the optical paths of the left and right eyes are moved as a whole along the direction perpendicular to the optical axis to adjust the pupillary distance and perform binocular fusion;

[0039] 7. Move the optotype objective lens 10 out of the optotype optical path, adjust the optotype display device 11 to the near vision refraction position, and make the optotype display device 11 display the near vision refraction optotype. At this time, the human eye 7 observes the optotype displayed on the optotype display device 11 (corresponding to the optotype one or two rows above the best visual acuity in the visual acuity chart) through the first relay telescope 6, the cylindrical mirror pair 5, the first beam splitter 4 and the second beam splitter 3.

[0040] 8. Taking the NRA test as an example, by moving the component within the large dashed box, the distance between the two lenses in the first relay telescope 6 is changed to simultaneously increase the positive diopter in both eyes (with an increase rate of +0.25D as an example) until the patient first reports persistent blurring of the target (first means the patient notices the target is blurred but can still read it), and the total increase in positive diopter is recorded; then, the component within the large dashed box is restored to the state in step 5 to start the PRA test. By moving the component within the large dashed box in the direction of the arrow, the distance between the two lenses in the first relay telescope 6 is changed to simultaneously increase the negative diopter in both eyes (with an increase rate of -0.25D) until the patient first reports persistent blurring of the target, and the total increase in negative diopter is recorded, thus completing the PRA / NRA test.

[0041] 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.

[0042] 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. An optometric device, characterized in that, include: Objective refraction module and subjective refraction module; The objective refraction module includes a beacon light source and a wavefront sensor. When the 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 subjective refraction module includes a target display device and a target objective lens. The light emitted by the target display device can enter the wavefront measurement optical path through the target optical path and coincide with the optical axis of the wavefront measurement optical path. The target objective lens is movably disposed in the refraction device. The target objective lens can move into and out of the target optical path. When the target objective lens is located in the target optical path, the target display device can be located on the focal plane of the target objective lens.

2. The optometry device according to claim 1, characterized in that, The target objective lens is mounted on a first slider, which can be driven by a first lead screw to move the target objective lens into and out of the target optical path.

3. The optometry device according to claim 1, characterized in that, The target objective lens is mounted on a turntable, and the plane of the turntable is perpendicular to the optical axis of the target optical path. A through hole is also provided at a position different from the target objective lens on the circumference of the turntable. When the turntable rotates, the through hole can move into the target optical path.

4. The optometry device according to claim 2 or 3, characterized in that, The target display device is movably disposed in the optometry device, and the direction of movement of the target display device is parallel to the optical axis of the target optical path.

5. The optometry device according to claim 3, characterized in that, The optical axis of the target optical path is perpendicular to the optical axis of the wavefront measurement optical path.

6. The optometry device according to claim 5, characterized in that, The target display device is mounted on the second slider, which can be driven by the second lead screw to move the target display device along the optical axis perpendicular to the wavefront measurement optical path.

7. The optometry device according to claim 1, characterized in that, The measurement optical path includes a first relay telescope, a pair of cylindrical mirrors, a first beam splitter, and a second relay telescope. The light emitted from the beacon light source reaches the first beam splitter via the beacon optical path, is reflected by the first beam splitter, and then passes sequentially through the pair of cylindrical mirrors 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 pair of cylindrical mirrors to reach the first beam splitter, and then passes through the first beam splitter and the second relay telescope to reach the wavefront sensor.

8. The optometry device according to claim 7, characterized in that, The beacon optical path includes a collimating objective lens and a second beam splitter. The light emitted from the beacon light source passes through the collimating objective lens to the second beam splitter. After being reflected by the second beam splitter, the light reaches the first beam splitter and is reflected by the first beam splitter to coincide with the optical axis of the wavefront measurement optical path. The light emitted by the target display device can pass through the second beam splitter to reach the first beam splitter and be reflected by the first beam splitter to coincide with the optical axis of the wavefront measurement optical path.

9. A binocular refraction device, characterized in that, It includes two optometry devices as described in any one of claims 1-8, wherein the two optometry devices are arranged symmetrically.

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