Visual acuity testing device and method thereof

Abstract

To provide a visual acuity testing device capable of improving analysis accuracy of myopia, and a method thereof.SOLUTION: A visual acuity testing device comprises: an ocular axial length measuring optical path including an eyepiece, using the eyepiece as a common member, installed parallel thereto, and used to measure an ocular axial length of a subject's eye; a refractivity detection optical path used to acquire ametropia information of the subject's eye; a target optical path used to provide a fixation image to the subject's eye and to cause the subject's eye to gaze stably; and eye position monitoring optical path used to perform three-dimensional localization of the subject's eye and collect imaging information of the subject's eye. Besides acquisition of the ametropia information of the eye, the visual acuity testing device can acquire a parameter of the eye by measuring anterior and posterior eye areas.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of ophthalmology and related technical fields, and in particular to a vision testing apparatus and method. [Background technology]

[0002] Myopia in the human eye is mainly divided into two types: refractive myopia and axial myopia. Refractive myopia is mainly caused by a strong refractive index of the cornea or crystalline lens, or an abnormal combination of each refractive component. Axial myopia occurs when the eye axis elongates and the axial length exceeds the normal range. Usually, if the eye axis is longer by 1 mm, the degree of myopia increases by -2.00 to -3.00. Different preventive and control measures must be taken depending on the cause of myopia, so measuring the axial length plays an important role in preventing and controlling myopia.

[0003] In recent years, with the development and spread of electronic technology and strong parental interest in their children's education, the rate of myopia among primary and secondary school students has become increasingly serious. In China in 2014, the number of primary, secondary and secondary school students suffering from myopia nationwide exceeded 100 million, making myopia a serious public health issue that threatens the eye health of young people.

[0004] In order to prevent and control myopia in adolescents, it is necessary to measure not only basic objective visual acuity but also refractive error and axial length. Conventional techniques provide methods and devices for synchronous measurement of refractive error and axial length. These techniques combine time-domain optical interference technology and Shack-Hartmann wavefront detection technology to realize simultaneous detection of axial length and refractive error, providing technical backup in myopia screening tests. However, these techniques are not practical for myopia screening in adolescents because they cannot effectively and accurately judge the refractive index or measure the axial length for young children who have poor fixation ability. In addition, some techniques cannot synchronously collect anterior and posterior segment images, and the manufacturing costs of the equipment are relatively high. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT EMBODIMENT The present invention aims to provide a four-path combined, low-cost vision testing apparatus and method therefor in order to overcome the shortcomings in the prior art. [Means for solving the problem]

[0006] The technical solution of the visual acuity testing device provided by the present invention is as follows:

[0007] A vision testing device, comprising an eyepiece, and a pair of eyes, the eyepiece being a common member and arranged in parallel, an axial length measurement optical path used to measure the axial length of the subject's eye; a refraction detection optical path used to acquire refractive error information of the subject's eye; A visual target optical path used to provide a fixation image to the subject's eye and allow the subject to stably gaze at the eye; The device further includes an eye position monitoring optical path used for performing three-dimensional localization of the subject's eye and collecting imaging information of the subject's eye.

[0008] By adopting the above-mentioned technical solution, compared with the prior art, the technical solution provided by the present application can at least bring the following beneficial effects: By installing the axial length measurement optical path, the refraction detection optical path, the visual target optical path and the eye position monitoring optical path in parallel, when measuring the visual acuity of a person's eye, the axial length of the eye of the subject can be obtained through the axial length measurement optical path according to actual needs, the position information of the eye of the subject can be determined through the visual target optical path, and the refractive error information of the eye of the subject can be obtained through the refraction detection optical path. In the process of measuring the refractive error information, a fixation image can be provided in real time, and the eye of the subject can be stably gazed, which is more suitable for the visual acuity test of adolescents and children. At the same time, there is no need to quickly switch the optical path when measuring the eye axis, and there is no need to switch the optical path between the anterior and posterior parts of the eye with a galvanometer mirror, so that the difficulty of adjusting the consistency of the optical path is reduced and the cost is greatly reduced. Therefore, this technical solution can accurately determine the refractive power and measure the axial length, and is highly practical in myopia testing for young people.

[0009] Preferably, the axial length measuring optical path comprises: a light source module used to generate the measurement light; a spectroscope disposed on a transmission path of the measurement light, for receiving the measurement light and splitting the measurement light into a reflected light and a transmitted light; a first prism disposed on the transmission path of the reflected light, for reflecting the reflected light, forming a fundus information collecting light, and retro-reflecting the light to transmit the light via a spectroscope; a movable prism module disposed on the transmission path of the transmitted light, for reflecting the transmitted light, forming a cornea information collecting light, and retro-reflecting the light through a spectroscope; a first spectroscopic mirror that is disposed on a transmission path of the transmitted light of the fundus information collecting light that has passed through the spectrometer, and is used for reflecting the transmitted light of the fundus information collecting light that has passed through the spectrometer and the reflected light of the cornea information collecting light that has passed through the spectrometer, and forming and emitting the eye axis information collecting light; an optical path definition module, which is installed on the transmission path of the eye axis information collecting light, for introducing the eye axis information collecting light into the eye of the subject, and reflecting the eye axis information reflected light through the fundus and cornea of ​​the eye of the subject, and then reflecting the reflected light back to the first spectroscopic mirror; The measurement signal receiving module is installed on the transmission path of the transmitted light of the eye axis information reflected light via the first spectroscopic mirror and is used to receive transmitted light interference information of the eye axis information reflected light via the first spectroscopic mirror.

[0010] By installing in this way, after the corneal information collecting light and the fundus information collecting light are formed, the corneal information collecting light can be transmitted along the spectroscope, the first spectroscope, and the optical path defining module to enter the eye of the subject, and in addition, a movable prism module is installed, and the movable prism module can be moved back and forth to ensure effective collection of anterior segment information, especially corneal position information. At the same time, a fundus signal can be installed to be transmitted along the spectroscope, the first spectroscope, and the optical path defining module to enter the fundus of the subject's eye, and the interference signal between the anterior segment signal and the fundus information collecting light is received by the measurement signal receiving module, and the axial length of the subject's eye can be smoothly calculated by utilizing the optical interference pattern.

[0011] Preferably, the light source module includes a light source used to generate the measurement light and a first lens disposed on the transmission path of the measurement light, so that the light emitted by the light source can be converted into a parallel beam through a collimator lens, and the parallel beam can enter a spectrometer for processing.

[0012] Preferably, the movable prism module includes a motorized sliding table installed in the control system, and a second prism installed on the motorized sliding table, and the motorized sliding table is used to drive the second prism. With this installation, the second prism is driven by the motorized sliding table, and the control system (such as a servo motor system) of the motorized sliding table can realize the control of the distance and position of driving it, thereby realizing the automated control of the eye axis measurement.

[0013] Preferably, the optical path definition module includes a first reflecting mirror, a second splitting mirror and an eyepiece lens arranged along the transmission direction of the eye axis information collecting light, so that the eye axis information collecting light is reflected via the first splitting mirror, and is further reflected by the first reflecting mirror and the second splitting mirror, projected into the eye, focused on the anterior segment and the fundus, and reflected back along the original path.

[0014] Preferably, the measurement signal receiving module includes a second lens and an interferometer arranged along the transmission direction of the transmitted light of the axial information reflected light via the first spectroscopic mirror, whereby the second lens can focus the axial information collecting light transmitted through the first spectroscopic mirror, and the interference signal is collected by the interferometer, thereby obtaining the axial length.

[0015] Preferably, the refraction detection optical path includes a movable refraction light detection light source used to send refraction detection light, and a movable focusing lens, a movable annular aperture, a third lens, a reflector with a center hole, a third splitting mirror, a second splitting mirror, a fourth splitting mirror and an eyepiece lens arranged along the transmission direction of the refraction detection light.

[0016] When the refraction detection light enters the eye of the subject, it is reflected by the fundus of the eye of the subject to form a refraction detection reflected light, which returns along its original path and is transmitted through the reflector with a center hole. The refraction detection optical path further includes a second reflector, a fourth lens, a first movable lens, a fifth lens, and a first image sensor, which are arranged along the transmission direction of the refraction detection reflected light transmitted through the reflector with a center hole.

[0017] By installing the above-mentioned optical path and using the circular confocal method to measure refractive error, it is possible to smoothly collect refractive error information for the eyes of various populations, particularly young subjects, and furthermore, by using these components for installation, manufacturing costs are significantly reduced.

[0018] Preferably, the target optical path includes a movable target used to generate a fixation optical signal, and a sixth lens, a third spectroscopic mirror, a second spectroscopic mirror, a fourth spectroscopic mirror, and an eyepiece lens arranged along a transmission direction of the fixation optical signal, thereby providing a fixed observation target for the subject's eye, which is advantageous in collecting refractive error information from the subject's eye.

[0019] Preferably, the eye position monitoring optical path includes a first periocular illumination light source and a second periocular illumination light source, and the first periocular illumination light source and the second periocular illumination light source illuminate the eye of the subject to form a reflected illumination light signal. The eye position monitoring optical path further includes an eyepiece, a fourth splitter, a seventh splitter, and a second image sensor arranged along the transmission direction of the reflected illumination light signal, and an eye illumination light source and a position measuring device arranged symmetrically inclined with respect to the central axis of the eye of the subject. The second image sensor is used to monitor the position of the eye of the subject and to guide the operator and the subject to align the eye of the subject with the central axis of the eyepiece, and the position measuring device is used to monitor the front-back position of the eye of the subject with respect to the eyepiece. This allows the position information of the eye of the subject to be smoothly acquired, and three-dimensional localization is realized.

[0020] The technical solution of the visual acuity testing method provided by the present invention is as follows:

[0021] A visual acuity testing method based on the visual acuity testing device described in the technical solution of this application, comprising the following steps: Step 1: an operator determines and guides the position of the subject's eyes through an eye position monitoring optical path to complete the alignment of the subject's eyes; Step 2: stably gazing at the subject's eye through the target optical path, and detecting refractive error information for the subject's eye through the refraction detection optical path, thereby obtaining a detection result of refractive error information corresponding to the subject's eye; Step 3: collecting interference information formed by reflected light from the fundus and cornea of ​​the subject's eye through the axial length measurement optical path; and step 4, utilizing the detection result of the refractive error information and the axial length to draw a conclusion about the visual acuity state of the subject's eye.

[0022] By adopting the above-mentioned technical solution, compared with the prior art, the technical solution provided by the present application can at least provide the following beneficial effects: The present solution is based on the visual acuity testing device described in the technical solution of the present application, which first performs refraction measurement, then collects retinal images, and finally obtains axial length, thereby greatly reducing the cost of measuring refraction and axial length, and has high accuracy in assessing the degree of myopia in young people. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a conceptual diagram showing the structure of an optical path of the visual acuity testing device of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing the structure of an axial length measurement optical path in the visual acuity testing device of the present invention. [Diagram 3] 1 is a periocular imaging image acquired by the visual acuity testing device of the present invention. [Figure 4] 1 is a circular image of a fundus reflex acquired by a visual acuity testing device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical solutions in the embodiments of the present invention will be described with reference to the accompanying drawings in order to make the technical solutions in the embodiments of the present invention clearer. EXAMPLES

[0025] The visual acuity testing device provided by the embodiment of the present invention includes an eyepiece 4, and further includes: an axial length measurement optical path used to measure the axial length of the eye 1 of a subject; a refraction detection optical path used to acquire refractive error information of the subject's eye 1; a visual target optical path used to provide a fixation image to the eye 1 of the subject to be measured and to allow the eye 1 of the subject to stably gaze at the image; The apparatus further includes an eye position monitoring optical path used for performing three-dimensional positioning of the subject's eye 1 and collecting imaging information of the subject's eye 1.

[0026] In this embodiment, the axial length measurement optical path is: a light source module 22 used to generate the measurement light; a spectrometer 33 that is disposed on the transmission path of the measurement light and receives the measurement light and separates the measurement light into a reflected light and a transmitted light; a first prism 34 disposed on the transmission path of the reflected light, for reflecting the reflected light, forming fundus information collecting light, and retro-reflecting the light to transmit it via a spectroscope 33; a movable prism module 23 disposed on the transmission path of the transmitted light, for reflecting the transmitted light, forming a corneal information collecting light, and retro-reflecting the light through a spectrometer 33; a first spectroscopic mirror 36 that is disposed on a transmission path of the transmitted light of the fundus information collecting light that has passed through the spectrometer 33, and is used to reflect the transmitted light of the fundus information collecting light that has passed through the spectrometer 33 and the reflected light of the cornea information collecting light that has passed through the spectrometer 33, and to form and emit the eye axis information collecting light; an optical path definition module 24 that is installed on a transmission path of the eye axis information collecting light, introduces the eye axis information collecting light into the eye 1 of the subject, and reflects the light through the fundus and cornea of ​​the eye 1 of the subject to form an eye axis information reflected light, and reflects the light back to a first spectroscopic mirror 36; The measurement signal receiving module 25 is installed on the transmission path of the transmitted light of the eye axis information reflected light via the first spectroscopic mirror 36 and is used to receive transmitted light interference information of the eye axis information reflected light via the first spectroscopic mirror 36.

[0027] The reflected light is reflected via the first prism 34, forms a fundus information collecting light, is retroreflected, and is transmitted via the spectroscope 33. The transmitted light is reflected via the movable prism module 23, forms a cornea information collecting light, is retroreflected, and is reflected via the spectroscope 33, is combined with the fundus information collecting light, and is transmitted as an axial information collecting light. The spectroscope 33, the first spectroscope 36, and the optical path definition module 24 are installed along the transmission direction of the axial information collecting light. The axial information collecting light enters the subject's eye, is reflected via the anterior eye area and the fundus of the subject's eye, forms a reflected axial information collecting light, and returns to the original path to be transmitted via the first spectroscope 36. The first spectroscope 36 and the measurement signal receiving module 25 are installed along the transmission direction of the reflected axial information collecting light.

[0028] In this embodiment, the light source module 22 includes a light source 31 and a first lens 32 arranged along the light transmission direction of the measurement light. The movable prism module 23 includes a motor sliding table 39 arranged in a servo control system and a second prism 35 arranged on the motor sliding table 39. The light path definition module 24 includes a first reflecting mirror 30, a second splitting mirror 8 and an eyepiece lens 4 arranged along the transmission direction of the eye axis information collecting light. The measurement signal receiving module 25 includes a second lens 37 and an interferometer 38 arranged along the transmission direction of the reflected eye axis information collecting light passing through the first splitting mirror 36. The interferometer 38 is an optical sensor such as a PD, APD or PMT.

[0029] In this embodiment, the refraction detection optical path includes a movable refraction detection light source 16 used for sending the refraction detection light, a movable focusing lens 15, a movable annular aperture 14, a third lens 13, a reflector 12 with a center hole, a third splitter mirror 9, a second splitter mirror 8, a fourth splitter mirror 5 and an eyepiece lens 4, which are arranged along the transmission direction of the refraction detection light.

[0030] When the refraction detection light enters the eye 1 of the person being measured, it is reflected via the fundus of the eye 1 of the person being measured to form refraction detection reflected light, which then returns along its original path via the reflector 12 with a center hole, and a portion of the light beam is transmitted through the light-transmitting hole of the reflector 12 with a center hole.

[0031] The refraction detection optical path further includes a second reflector 17, a fourth lens 18, a first movable lens 19, a fifth lens 20 and a first image sensor 21 arranged along the transmission direction of the refraction detection reflected light transmitted through the center hole reflector 12.

[0032] The visual target optical path adopted in this embodiment includes a movable visual target 11, a sixth lens 10, a third spectroscopic mirror 9, a second spectroscopic mirror 8, a fourth spectroscopic mirror 5 and an eyepiece lens 4, which are arranged along the transmission direction of the fixation light signal. The movable visual target 11, the movable refraction detection light source 16, the movable focusing lens 15, the movable annular aperture 14 and the first movable lens 19 are arranged to move synchronously, thereby providing a conjugate environment of the object and the image.

[0033] In this embodiment, the eye position monitoring optical path includes a first periocular illumination light source 301 and a second periocular illumination light source 302, which illuminate the subject's eye to form a reflected illumination light signal. The eye position monitoring optical path further includes an eyepiece 4, a fourth splitter 5, a seventh splitter 6 and a second image sensor 7, which are arranged along the transmission direction of the reflected illumination light signal, and an eye illumination light source 201 and a position measuring device 202, which are arranged symmetrically inclined with respect to the central axis of the subject's eye 1. The second image sensor 7 is an area array image sensor, which can accurately locate the position of the subject's eye based on the image and align the center of the eye with the optical center of the device. Therefore, the second image sensor 7 is used to monitor the position of the subject's eye and guide the operator and the subject to align the subject's eye with the central axis of the eyepiece 4, and the position measuring device 202 is used to monitor the front-rear position of the subject's eye relative to the eyepiece 4.

[0034] The first periocular illumination light source 301 and the second periocular illumination light source 302 are both infrared light sources and are installed on both sides of the optical path. The eye illumination light source 201 and the position measuring device 202 are installed tilted symmetrically with respect to the central axis of the eye (bilateral symmetry, the eye illumination light source 201 and the position measuring device 202 are on the left and right sides, respectively, when the eye is viewed normally), and the tilt angle is 30 to 60 degrees. The light from the eye illumination light source 201 is reflected by the cornea of ​​the eye and then enters the position measuring device 202. When the anterior-posterior position of the eye is changed, the signal distribution in the position measuring device 202 changes, so that the anterior-posterior position of the eye, i.e., the distance from the cornea to the device, can be accurately monitored by the position measuring device 202. EXAMPLES

[0035] The visual acuity testing method provided by this embodiment is based on the visual acuity testing device provided by the embodiment of the present invention, and includes the following steps: Step 1: an operator determines and guides the position of the subject's eyes through an eye position monitoring optical path to complete the alignment of the subject's eyes; Step 2: stably gazing at the subject's eye through the target optical path, and detecting refractive error information for the subject's eye through the refraction detection optical path, thereby obtaining a detection result of refractive error information corresponding to the subject's eye; Step 3: collecting interference information formed by reflected light from the fundus and cornea of ​​the subject's eye through the axial length measurement optical path; and step 4, utilizing the detection result of the refractive error information and the axial length to draw a conclusion about the visual acuity state of the subject's eye.

[0036] Specifically, the eye position is first determined by the eye position monitoring optical path to guide the operator to complete eye alignment. After the eye is aligned, the measurement process begins. First, the refraction is measured. The refraction is pre-calculated based on the annular image in the first image sensor 21, and the components within the dotted frame are moved back and forth based on the pre-calculated refraction. That is, the movable target 11, the movable refraction detection light source 16, the movable focusing lens 15, the movable annular diaphragm 14 and the first movable lens 19 are moved synchronously, thereby accurately measuring the refraction of the eye.

[0037] After the measurement of the refraction is completed, the axial length is measured. The second prism 35 is moved back and forth quickly by operating the movable prism module, and the signal in the interferometer 38 is collected synchronously at high speed, and the axial length is calculated based on the signal from the interferometer 38. The interferometer 38 is used to measure the interference signal, and the formation of the interference signal is completed by the reflected light from the anterior surface of the cornea and the reflected light from the fundus. The light from the light source 31 is divided into two parts via the spectrometer 33, one part (the reflected light) enters the first prism 34 and is reflected, and the other part (the transmitted light) enters the second prism 35 and is reflected, the light reflected via the first prism 34 is finally irradiated to the eye and enters the fundus, and the reflected light from the fundus finally enters the interferometer 38. The light reflected via the second prism 35 is finally irradiated to the eye, reflected by the corneal surface, and then enters the interferometer 38. During the process of moving the second prism 35 back and forth, the optical distance that the reflected light from the cornea travels to the interferometer 38 can be changed, and an interference signal is formed when the optical distance between the reflected light from the fundus and the interferometer 38 becomes equal. Since the interference signal is directly derived from the reflection between the cornea and the fundus, the axial length (i.e., the distance from the cornea to the fundus) can be directly determined by the moving distance of the second prism 35, and the axial length is expressed as Le=ρ×Zp, where Zp is the distance of the second prism 35 to the zero point of the system, and ρ is a proportionality constant.

[0038] In the optical path design, the movable ring-shaped aperture 14, the first image sensor 21, and the movable target 11 are in a conjugate relationship between the object and the image. Under the initial structural condition of the optical path, the three of the movable ring-shaped aperture 14, the first image sensor 21, and the movable target 11, and the fundus are in a conjugate relationship between the object and the image, and the first image sensor 21 can capture a clear image of the movable ring-shaped aperture 14, and the size of the ring is fixed. However, if the subject's eye has a refractive error, the conjugate relationship between the object and the image is broken, and the human eye cannot see the target clearly, and the image of the movable ring-shaped aperture 14 captured in the first image sensor 21 becomes unclear and changes in size. At this time, when the movable ring-shaped aperture 14, the first image sensor 21, and the movable target 11 are moved back and forth to a specific characteristic distance L, the three of the movable ring-shaped aperture 14 and the fundus are returned to a conjugate relationship between the object and the image, and the human eye can see the target clearly, and the first image sensor 21 can capture a clear image of the movable ring-shaped aperture 14, and the size is restored. The refractive value of the human eye and the distance L traveled by the three are in a geometric relationship, so that the refractive index D=βL, where β is the proportionality coefficient.

[0039] In this embodiment, the optical path design is such that the optical path for measuring the axial length is set on approximately the same plane (the optical center is coplanar), and the optical path for detecting the refraction, the optical path for the target, and the optical path for monitoring the eye position are set on different planes. In other words, a two-layer design is adopted overall.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of the present invention being defined by the appended claims and their equivalents. [Explanation of symbols]

[0041] 1. Subject's eyes 4 Eyepieces 5 4th spectroscope 6 7th lens 7 Second Image Sensor 8 Second spectroscopic mirror 9 Third spectroscope 10 6th lens 11 Movable optotype 12 Reflector with center hole 13 Third lens 14 Movable ring-shaped aperture 15 Adjustable focusing lens 16 Movable refraction detection light source 17 Second reflector 18 Fourth lens 19 First movable lens 20 5th lens 21 First image sensor 22 Light source module 23 Movable Prism Module 24 Optical Path Definition Module 25 Measurement signal receiving module 30 1st reflector 31 Light source 32 First lens 33 Spectrometer 34 First Prism 35 Second Prism 36 1st spectroscope 37 Second lens 38 Interferometer 39 Motorized Sliding Table 201 Eye illumination light source 202 Position measuring device 301 First Periocular Illumination Light Source 302 Second Periocular Illumination Light Source

Claims

1. A vision testing device, comprising an eyepiece (4), and further comprising: an axial length measurement optical path used to measure the axial length of the subject's eye; a refraction detection optical path used to acquire refractive error information of the subject's eye; A visual target optical path used to provide a fixation image to the eye of the subject to be measured and to allow the eye of the subject to stably gaze; and an eye position monitoring optical path used for performing three-dimensional localization of the subject's eye and collecting imaging information of the subject's eye.

2. The axial length measuring optical path is a light source module (22) used to generate measurement light; a spectrometer (33) disposed on a transmission path of the measurement light, for receiving the measurement light and splitting the measurement light into a reflected light and a transmitted light; a first prism (34) disposed on a transmission path of the reflected light, for reflecting the reflected light, forming a fundus information collecting light, and retro-reflecting the light to transmit the light via the spectrometer (33); a movable prism module (23) disposed on the transmission path of the transmitted light, for reflecting the transmitted light, forming a corneal information collecting light, and retro-reflecting the light through the spectrometer (33); a first spectroscopic mirror (36) that is installed on a transmission path of the transmitted light of the fundus information collecting light that has passed through the spectroscopic mirror (33), and that is used to reflect the transmitted light of the fundus information collecting light that has passed through the spectroscopic mirror (33) and the reflected light of the cornea information collecting light that has passed through the spectroscopic mirror (33), and to form and emit an axial information collecting light; an optical path definition module (24) that is installed on a transmission path of the eye axis information collecting light, introduces the eye axis information collecting light to the eye of the subject, and reflects the light through the fundus and cornea of ​​the subject's eye to form an eye axis information reflected light, and reflects the light back to the first spectroscopic mirror (36); The vision testing device as described in claim 1, characterized in that it also includes a measurement signal receiving module (25) that is installed on the transmission path of the transmitted light of the eye axis information reflected light via the first spectroscopic mirror (36) and is used to receive transmitted light interference information of the eye axis information reflected light via the first spectroscopic mirror (36).

3. The visual acuity testing device of claim 2, characterized in that the light source module (22) includes a light source (31) used to generate the measurement light and a first lens (32) installed on the transmission path of the measurement light, the movable prism module (23) includes a motor sliding table (39) installed in a control system and a second prism (35) installed on the motor sliding table (39), the motor sliding table (39) is used to drive the second prism (35), the optical path definition module (24) includes a first reflecting mirror (30), a second splitting mirror (8) and the eyepiece lens (4) installed along the transmission direction of the eye axis information collecting light, and the measurement signal receiving module (25) includes a second lens (37) and an interferometer (38) installed along the transmission direction of the transmitted light of the eye axis information reflected light via the first splitting mirror (36).

4. the refraction detection optical path includes a movable refraction light detection light source (16) used to transmit refraction detection light, and further includes a movable focusing lens (15), a movable annular aperture (14), a third lens (13), a reflector (12) with a center hole, a third splitter mirror (9), the second splitter mirror (8), a fourth splitter mirror (5), and the eyepiece lens (4), which are arranged along the transmission direction of the refraction detection light; The vision testing device described in claim 3, characterized in that when the refraction detection light enters the eye of the subject, it is reflected via the fundus of the subject's eye to form a refraction detection reflected light, which returns along its original path and is transmitted and passed through the center hole reflector (12), and the refraction detection optical path further includes a second reflector (17), a fourth lens (18), a first movable lens (19), a fifth lens (20) and a first image sensor (21) arranged along the transmission direction of the refraction detection reflected light that is transmitted and passed through the center hole reflector (12).

5. The target optical path includes a movable target (11) used to generate a fixation light signal, and a sixth lens (10), the third spectroscopic mirror (9), the second spectroscopic mirror (8), the fourth spectroscopic mirror (5), and the eyepiece lens (4) that are arranged along a transmission direction of the fixation light signal; The eye position monitoring optical path includes a first periocular illumination light source (301) and a second periocular illumination light source (302), the first periocular illumination light source (301) and the second periocular illumination light source (302) irradiate the eye of the subject to form a reflected illumination light signal, the eye position monitoring optical path further includes the eyepiece lens (4), the fourth splitter mirror (5), the seventh splitter mirror (6) and a second image sensor (7) arranged along the transmission direction of the reflected illumination light signal, and an eye illumination light source (201) and a position measuring device (202) arranged at an angle symmetrically with respect to the central axis of the eye of the subject, the second image sensor (7) is used to monitor the position of the eye of the subject and to guide the operator and the subject to align the eye of the subject with the central axis of the eyepiece lens (4), and the position measuring device (202) is used to monitor the anterior-posterior position of the eye of the subject relative to the eyepiece lens (4).

6. A method for visual acuity testing based on the visual acuity testing device according to any one of claims 1 to 5, comprising the following steps: Step 1: an operator determines and guides the position of the subject's eyes through the eye position monitoring optical path to complete eye alignment of the subject; Step 2: stably gazing at the eye of the subject through the target optical path, and detecting refractive error information of the eye of the subject through the refraction detection optical path, thereby obtaining a detection result of refractive error information corresponding to the eye of the subject; Step 3: collecting interference information formed by reflected light of the fundus and cornea of ​​the subject's eye by the axial length measurement optical path; and step 4. using the detection result of the refractive error information and the axial length to draw a conclusion about the visual acuity state of the subject's eye.

Images