Vision inspection apparatus 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 ophthalmology and its technical field, and specifically to a vision testing device and its method.

Background Art

[0002] Myopia in human eyes 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 lens or an abnormality in the combination of each refractive component. Axial myopia occurs when the eye axis elongates and the length of the eye axis exceeds the normal range. Generally, if the eye axis is 1 mm longer, the myopia degree increases by -2.00 to -3.00. Since different preventive and inhibitory measures must be taken depending on the difference in the cause of myopia, the measurement of the eye axis length plays an important role in the prevention and inhibition of myopia.

[0003] In recent years, with the development and popularization of electronic product technology and the strong concern of parents for children's learning, the myopia rate among primary and middle school students has become increasingly serious. In China in 2014, the number of myopic people among primary, middle, and high school students nationwide exceeded 100 million, and myopia has become a major public health problem threatening the eye health of teenagers.

[0004] In the prevention and inhibition of myopia in teenagers, it is necessary to measure not only basic objective vision but also refractive abnormalities and eye axis length. Although conventional technologies have provided methods and devices for synchronous measurement of refractive abnormalities and eye axis length, those technical solutions combine time-domain optical interference technology and Shack-Hartmann wavefront detection technology to achieve simultaneous detection of eye axis length and refractive abnormalities, providing technical backup in myopia screening tests. However, those technical solutions cannot effectively and accurately determine the refractive degree and measure the eye axis length for children with weak fixation ability, so they had low practicality in the myopia examination of teenagers. In addition, some technical solutions cannot collect anterior eye images and posterior eye images synchronously, and the manufacturing cost of the equipment was also relatively high.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention aims to provide a low-cost vision testing apparatus and method thereof by combining four optical paths to overcome the drawbacks in the prior art.

Means for Solving the Problems

[0006] The technical solution of the vision testing apparatus provided by the present invention is as follows.

[0007] A vision testing apparatus, including an eyepiece lens, and at the same time, using the eyepiece lens as a common member and installed in parallel, an axial length measurement optical path used to measure the axial length of the eye of the person to be measured, a refractive power detection optical path used to obtain refractive abnormality information of the eye of the person to be measured, a target optical path used to provide a fixation image to the eye of the person to be measured and stably fix the eye of the person to be measured, and further including an eye position monitoring optical path used to perform three-dimensional positioning on the eye of the person to be measured and collect imaging information of the eye of the person to be measured.

[0008] By adopting the above technical solution, compared with the prior art, the technical solution provided by the present application can bring at least the following beneficial effects. By installing the axial length measurement optical path, refractive power detection optical path, visual target optical path, and eye position monitoring optical path in parallel, when measuring a person's eyesight, according to the actual needs, the axial length of the measured person's eyes can be obtained through the axial length measurement optical path, the position information of the measured person's eyes can be determined through the eye position monitoring optical path, the measured person's eyes can be stably fixated through the visual target optical path, and the refractive anomaly information of the measured person's eyes can be obtained through the refractive power detection optical path. During the measurement process of the refractive anomaly information, a fixation image can be provided in real time, and the measured person's eyes can be stably fixated. Thus, it becomes more suitable for the eyesight examination of teenagers and children. At the same time, when measuring the axial length, there is no need to quickly switch the optical path, and there is also no need to use a galvanometer mirror to switch the optical paths of the anterior eye part and the posterior eye part. Therefore, the difficulty of adjusting the optical path consistency is reduced, and the cost is also significantly reduced. Therefore, this technical solution can accurately determine the refractive power and measure the axial length, and has high practicality in the myopia examination of teenagers.

[0009] Preferably, the axial length measurement optical path is a light source module used to generate measurement light, a spectroscope installed on the transmission path of the measurement light, which receives the measurement light and is used to split the measurement light into reflected light and transmitted light, a first prism installed on the transmission path of the reflected light, which reflects the reflected light, forms fundus information collection light, retroreflects it, and transmits it through the spectroscope, a movable prism module installed on the transmission path of the transmitted light, which reflects the transmitted light, forms corneal information collection light, retroreflects it, and reflects it through the spectroscope, a first spectroscope installed on the transmission path of the transmitted light of the fundus information collection light passing through the spectroscope, which reflects the transmitted light of the fundus information collection light passing through the spectroscope and the reflected light of the corneal information collection light passing through the spectroscope, forms axial length information collection light, and emits it, An optical path definition module installed on the transmission path of the eye axis information collection light, introducing the eye axis information collection light into the eyes of the measurement subject, and used to form the eye axis information reflected light by reflecting it through the fundus and cornea of the measurement subject's eyes and retroreflecting it to the first spectroscope; A measurement signal receiving module installed on the transmission path of the transmitted light of the eye axis information reflected light passing through the first spectroscope and used to receive the transmitted light interference information of the eye axis information reflected light passing through the first spectroscope.

[0010] By installing in this way, after the corneal information collection light and the fundus information collection light are formed, the corneal information collection light can be transmitted along the spectroscope, the first spectroscope, and the optical path definition module and enter the eyes of the measurement subject. In addition, a movable prism module is installed, and by adjusting the forward and backward movement of the movable prism module, the effective collection of anterior eye information, especially corneal position information, can be ensured. At the same time, the fundus signal can be transmitted along the spectroscope, the first spectroscope, and the optical path definition module and installed to enter the fundus of the measurement subject's eyes. The interference signal between the anterior eye signal and the fundus information collection light associated with this is received by the measurement signal receiving module, and by using the interference pattern of light, the axial length of the measurement subject's eyes can be smoothly calculated.

[0011] Preferably, the light source module includes a light source used to generate measurement light and a first lens installed on the transmission path of the measurement light. Thereby, the light emitted by the light source can become a parallel light beam through the collimator lens, and the parallel light beam can enter the spectroscope for processing.

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

[0013] Preferably, the optical path definition module includes a first reflector, a second beam splitter, and an eyepiece lens installed along the transmission direction of the eye axis information collection light. Thereby, the eye axis information collection light is reflected via the first beam splitter, further reflected by the first reflector and the second beam splitter, projected into the eye, focused on the anterior eye segment and the fundus, reflected, and returns along the original path.

[0014] Preferably, the measurement signal receiving module includes a second lens and an interferometer installed along the transmission direction of the transmitted light of the eye axis information reflected light via the first beam splitter. Thereby, the second lens can focus the eye axis information collection light transmitted through the first beam splitter, and its interference signal is collected by the interferometer, whereby the eye axis length can be obtained.

[0015] Preferably, the refractive power detection optical path includes a movable refractive light detection light source used to send the refractive power detection light, and a movable focusing lens, a movable annular aperture, a third lens, a mirror with a central hole, a third beam splitter, a second beam splitter, a fourth beam splitter, and an eyepiece lens installed along the transmission direction of the refractive power detection light.

[0016] When the refractive power detection light enters the eye of the measurement subject, it is reflected via the fundus of the eye of the measurement subject to form a refractive detection reflected light, returns along the original path, and is transmitted through the mirror with a central hole. The refractive power detection optical path further includes a second reflector, a fourth lens, a first movable lens, a fifth lens, and a first image sensor installed along the transmission direction of the refractive detection reflected light transmitted through the mirror with a central hole.

[0017] By installing the above optical path and using the annular confocal method for measuring refractive anomalies, it is possible to smoothly collect refractive anomaly information in the eyes of various individual groups, especially adolescent measurement subjects. Furthermore, by installing using these members, the manufacturing cost is significantly reduced.

[0018] Preferably, the visual target optical path includes a movable visual target used to generate a fixation optical signal, and a sixth lens, a third spectroscope, a second spectroscope, a fourth spectroscope, and an eyepiece lens installed along the transmission direction of the fixation optical signal. Thereby, an observation target fixed to the eyes of the measurement subject can be provided, which is advantageous for collecting refractive abnormality information from the eyes of the measurement subject.

[0019] Preferably, the eye position monitoring optical path includes a first circumocular illumination light source and a second circumocular illumination light source. The first circumocular illumination light source and the second circumocular illumination light source irradiate the eyes of the measurement subject to form a reflected illumination optical signal. The eye position monitoring optical path further includes an eyepiece lens, a fourth spectroscope, a seventh spectroscope, and a second image sensor installed along the transmission direction of the reflected illumination optical signal, and an ocular illumination light source and a position measuring device installed symmetrically inclined with respect to the central axis of the eyes of the measurement subject. The second image sensor is used to monitor the position of the eyes of the measurement subject and guide the operator and the measurement subject to align the eyes of the measurement subject with the central axis of the eyepiece lens. The position measuring device is used to monitor the front-back position of the eyes of the measurement subject with respect to the eyepiece lens. Thereby, the position information of the eyes of the measurement subject can be smoothly acquired, and three-dimensional positioning is realized.

[0020] The technical solution of the vision testing method provided by the present invention is as follows.

[0021] A vision testing method based on the vision testing device described in the technical solution of the present application, comprising the following steps: Step 1, in which the operator determines and guides the position of the eyes of the measurement subject through the eye position monitoring optical path to complete the alignment of the eyes of the measurement subject; Step 2, in which the eyes of the measurement subject are stably fixated by the visual target optical path, and refractive abnormality information of the eyes of the measurement subject is detected by the refractive power detection optical path, and a detection result of the refractive abnormality information corresponding to the eyes of the measurement subject is obtained; Step 3, in which interference information formed by the reflected light of the fundus and the cornea of the eyes of the measurement subject is collected by the eye axis length measurement optical path; Including step 4 of drawing a conclusion about the visual acuity state of the eyes of the person to be measured by using the detection result of refractive anomaly information and the axial length of the eye.

[0022] By adopting the above technical solution, compared with the prior art, the technical solution provided by the present application can bring at least the following beneficial effects. This case is based on the visual acuity inspection device described in the technical solution of the present application. First, the refractive power is measured, then the retinal image is collected, and finally the axial length of the eye is obtained, so that the cost of measuring the refractive power and the axial length of the eye is greatly reduced, and it has high accuracy for the evaluation of the myopia degree of teenagers.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0024] Hereinafter, based on the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly so as to be understood.

Embodiment

[0025] The visual acuity inspection device provided by the embodiment of the present invention includes an eyepiece 4, and further, an axial length measurement optical path used to measure the axial length of the eye 1 of the person to be measured, and a refractive power detection optical path used to obtain the refractive anomaly information of the eye 1 of the person to be measured, and a visual target optical path used to provide a fixation image to the eye 1 of the person to be measured and make the eye 1 of the person to be measured fixate stably, It further includes an eye position monitoring optical path used for performing three-dimensional positioning on the first eye of the measurement subject and collecting imaging information of the first eye of the measurement subject.

[0026] In this embodiment, the axial length measurement optical path is a light source module 22 used for generating measurement light, a spectroscope 33 installed on the transmission path of the measurement light, receiving the measurement light, and used for splitting the measurement light into reflected light and transmitted light, a first prism 34 installed on the transmission path of the reflected light, reflecting the reflected light, forming fundus information collection light, retroreflecting it, and transmitting it through the spectroscope 33, a movable prism module 23 installed on the transmission path of the transmitted light, reflecting the transmitted light, forming corneal information collection light, retroreflecting it, and reflecting it through the spectroscope 33, a first spectroscope 36 installed on the transmission path of the transmitted light of the fundus information collection light passing through the spectroscope 33, reflecting the transmitted light of the fundus information collection light passing through the spectroscope 33 and the reflected light of the corneal information collection light passing through the spectroscope 33, and used for forming and emitting axial length information collection light, an optical path definition module 24 installed on the transmission path of the axial length information collection light, introducing the axial length information collection light into the first eye of the measurement subject, and reflecting it through the fundus and cornea of the first eye of the measurement subject to form axial length information reflected light and retroreflect it to the first spectroscope 36, a measurement signal receiving module 25 installed on the transmission path of the transmitted light of the axial length information reflected light passing through the first spectroscope 36, and used for receiving the transmitted light interference information of the axial length information reflected light passing through the first spectroscope 36.

[0027] The reflected light is reflected via the first prism 34, forms fundus information collection light and is retroreflected, and is transmitted through the spectroscope 33. The transmitted light is reflected via the movable prism module 23, forms corneal information collection light and is retroreflected, is reflected via the spectroscope 33, and combines with the fundus information collection light to become eye axis information collection light and is transmitted. The spectroscope 33, the first spectroscope 36, and the optical path definition module 24 are installed along the transmission direction of the eye axis information collection light. The eye axis information collection light enters the eyes of the measurement subject, is reflected by the anterior eye area and the fundus of the measurement subject's eyes, then forms reflected eye axis information collection light, returns along the original path, and is transmitted through the first spectroscope 36. The first spectroscope 36 and the measurement signal receiving module 25 are installed along the transmission direction of the reflected eye axis information collection light.

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

[0029] In this embodiment, the refractive power detection optical path includes a movable refractive power detection light source 16, a movable focusing lens 15, a movable annular aperture 14, a third lens 13, a mirror 12 with a central hole, a third spectroscope 9, a second spectroscope 8, a fourth spectroscope 5, and an eyepiece lens 4 installed along the transmission direction of the refractive power detection light.

[0030] When the refractive power detection light enters the eye 1 of the measurement subject, it is reflected by the fundus of the eye 1 of the measurement subject to form refractive detection reflected light, returns along the original path, passes through the mirror 12 with a central hole, and a part of the light beam is transmitted through the light transmission hole of the mirror 12 with a central hole and is transmitted.

[0031] The refractive power detection optical path further includes a second mirror 17, a fourth lens 18, a first movable lens 19, a fifth lens 20, and a first image sensor 21 that are installed along the transmission direction of the refractive detection reflected light transmitted through the mirror 12 with a center hole.

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

[0033] In this embodiment, the eye position monitoring optical path includes a first circumocular illumination light source 301 and a second circumocular illumination light source 302. The first circumocular illumination light source 301 and the second circumocular illumination light source 302 irradiate the eyes of the measurement subject to form a reflected illumination optical signal. The eye position monitoring optical path further includes an eyepiece lens 4, a fourth beam splitter 5, a seventh beam splitter 6, and a second image sensor 7 that are installed along the transmission direction of the reflected illumination optical signal, and an eye illumination light source 201 and a position measuring device 202 that are installed to be inclined symmetrically with respect to the central axis of the eye 1 of the measurement subject. The second image sensor 7 is an area array image sensor, and based on the image, the position of the eye of the measurement subject can be accurately located and the center of the eye can be aligned with the optical center of the device. Therefore, the second image sensor 7 is used to monitor the position of the eye of the measurement subject and guide the operator and the measurement subject to align the eye of the measurement subject with the central axis of the eyepiece lens 4. The position measuring device 202 is used to monitor the front-back position of the eye of the measurement subject with respect to the eyepiece lens 4.

[0034] Both the first circumocular illumination light source 301 and the second circumocular illumination light source 302 are infrared light, and they are installed on both sides of their optical paths. The eye illumination light source 201 and the position measuring device 202 are installed with an inclination symmetrically with respect to the central axis of the eye (symmetric left and right, with the eyes looking straight ahead, and the eye illumination light source 201 and the position measuring device 202 are on the left and right sides respectively), and the inclination angle is set to 30 to 60 degrees. The light of the eye illumination light source 201 is reflected by the cornea of the eye and then enters the position measuring device 202. When the front-back position of the eye changes, a change occurs in the signal distribution in the position measuring device 202, so the position measuring device 202 can accurately monitor the front-back position of the eye, that is, the distance from the cornea to the device.

Embodiment

[0035] The vision inspection method provided by this embodiment is based on the vision inspection device provided by the embodiment of the present invention, and includes the following steps: Step 1, where the operator determines and guides the position of the measured person's eyes through the eye position monitoring optical path to complete the alignment of the measured person's eyes; Step 2, where the measured person's eyes are stably fixated through the visual target optical path, and refractive anomaly information of the measured person's eyes is detected through the refractive power detection optical path, and a detection result of the refractive anomaly information corresponding to the measured person's eyes is obtained; Step 3, where interference information formed by the reflected light of the fundus and cornea of the measured person's eyes is collected through the eye axis length measurement optical path; Step 4, where a conclusion is drawn about the vision state of the measured person's eyes by using the detection result of the refractive anomaly information and the eye axis length.

[0036] Specifically, first, the position of the eyes is determined through the eye position monitoring optical path, and the operator is guided to complete the alignment of the eyes. After aligning the eyes, the measurement process is started. First, the refractive power is measured. The refractive power is preliminarily calculated based on the annular image in the first image sensor 21, and based on the preliminarily calculated refractive power, the members within the dotted line frame are moved back and forth. That is, the movable visual target 11, the movable refractive detection light source 16, the movable focusing lens 15, the movable annular aperture 14, and the first movable lens 19 are synchronously moved, thereby accurately measuring the refractive power of the eyes.

[0037] After finishing the measurement of the refractive power, the axial length of the eye is measured. By operating the movable prism module, the second prism 35 is quickly moved back and forth, and the signals in the interferometer 38 are synchronously and rapidly collected, and the axial length of the eye is calculated based on the signals of 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 front surface of the cornea and the reflected light from the fundus. The light of the light source 31 is divided into two parts via the beam splitter 33. One part (reflected light) enters the first prism 34 and is reflected, and the other part (transmitted light) enters the second prism 35 and is reflected. The light reflected via the first prism 34 is finally irradiated onto 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 onto the eye, reflected from the corneal surface, and then enters the interferometer 38. During the process of moving the second prism 35 back and forth, the optical distance until the reflected light of the cornea reaches the interferometer 38 can be changed. When the optical distances of the reflected light from the fundus and the reflected light from the cornea to the interferometer 38 are equal, an interference signal is formed. Since the interference signal directly originates from the reflections of the cornea and the fundus, the axial length of the eye (the axial length is the distance from the cornea to the fundus) can be directly determined by the moving distance of the second prism 35, and the eye axial length Le = ρ × Zp, where Zp is the distance of the second prism 35 from the zero point of the system, and ρ is the proportionality constant.

[0038] In the optical path design, the movable annular 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 conditions of the optical path, the movable annular aperture 14, the first image sensor 21, and the movable target 11 are conjugate to the fundus of the eye in terms of object and image. A clear image of the movable annular aperture 14 can be obtained by the first image sensor 21, and the size of the ring is fixed. However, when there is refractive abnormality in the eye of the measurement target, such a conjugate relationship between the object and the image is broken, the human eye cannot clearly see the target, the image of the movable annular aperture 14 obtained in the first image sensor 21 becomes unclear, and the size also changes. At this time, when the movable annular aperture 14, the first image sensor 21, and the movable target 11 are moved back and forth and moved to a specific characteristic distance L, the conjugate relationship between the object and the image is restored between the three and the fundus of the eye, the human eye can clearly see the target, a clear image of the movable annular aperture 14 can be obtained by the first image sensor 21, and the size is also restored. The refractive value of the human eye and the moved distance L of the three are in a geometric ratio relationship, and the refractive power D = βL, where β is the proportionality coefficient.

[0039] In this embodiment, in the optical path design, the measurement optical path of the eye axis length is installed on substantially the same plane (optical center coplanar), and the refractive power detection optical path, the target optical path, and the eye position monitoring optical path are installed on another plane. That is, a two-layer design is generally adopted overall.

[0040] Although the embodiments of the present invention have been shown and described, it is 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, and the scope of the present invention is defined by the appended claims and their equivalents.

Explanation of Reference Numerals

[0041] 1 Eye of the measurement subject 4 Eyepiece 5 Fourth beam splitter 6 Seventh lens 7 Second image sensor 8 Second beam splitter 9 Third beam splitter 10 Sixth lens 11 Movable visual marker 12 Mirror with a center hole 13 Third lens 14 Movable annular aperture 15 Movable focusing lens 16 Movable refractive detection light source 17 Second mirror 18 Fourth lens 19 First movable lens 20 Fifth lens 21 First image sensor 22 Light source module 23 Movable prism module 24 Optical path definition module 25 Measurement signal receiving module 30 First mirror 31 Light source 32 First lens 33 Beam splitter 34 First prism 35 Second prism 36 First beam splitter 37 Second lens 38 Interferometer 39 Motor sliding table 201 Eye illumination light source 202 Position detector 301 First periorbital illumination light source 302 Second periorbital illumination light source

Claims

1. A vision testing device, including an eyepiece lens (4), and further including an axial length measurement optical path used for measuring the axial length of the eye of the person to be measured, which is installed in parallel with the eyepiece lens (4) as a common member, a refractive power detection optical path used for acquiring refractive error information of the eye of the person to be measured, a fixation target optical path used for providing a fixation image to the eye of the person to be measured to stably fixate the eye of the person to be measured, and an eye position monitoring optical path used for performing three-dimensional positioning on the eye of the person to be measured and collecting imaging information of the eye of the person to be measured. The axial length measurement optical path includes a light source module (22) used for generating measurement light, a spectroscope (33) installed on the transmission path of the measurement light, which receives the measurement light and is used for splitting the measurement light into reflected light and transmitted light, a first prism (34) installed on the transmission path of the reflected light, which reflects the reflected light, forms fundus information collection light, retroreflects it, and transmits it through the spectroscope (33), a movable prism module (23) installed on the transmission path of the transmitted light, which reflects the transmitted light, forms corneal information collection light, retroreflects it, and reflects it through the spectroscope (33), a first beam splitter (36) installed on the transmission path of the transmitted light of the fundus information collection light passing through the spectroscope (33), which reflects the transmitted light of the fundus information collection light passing through the spectroscope (33) and the reflected light of the corneal information collection light passing through the spectroscope (33), forms axial length information collection light, and emits it, an optical path definition module (24) installed on the transmission path of the axial length information collection light, which introduces the axial length information collection light into the eye of the person to be measured, and after reflection by the fundus and cornea of the eye of the person to be measured, forms axial length information reflected light and retroreflects it to the first beam splitter (36), and a measurement signal receiving module (25) installed on the transmission path of the transmitted light of the axial length information reflected light passing through the first beam splitter (36), which is used for receiving the interference information of the transmitted light of the axial length information reflected light passing through the first beam splitter (36). A vision testing device characterized by the above.

2. 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 the 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 reflector (30), a second beam splitter (8), and the eyepiece lens (4) installed along the transmission direction of the eye axis information collection light. 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 passing through the first beam splitter (36). The vision testing device according to claim 1, characterized in that it includes the above.

3. The refractive power detection optical path includes a movable refractive light detection light source (16) used to send the refractive power detection light, and further includes a movable focusing lens (15), a movable annular aperture (14), a third lens (13), a reflector with a central hole (12), a third beam splitter (9), the second beam splitter (8), a fourth beam splitter (5), and the eyepiece lens (4) installed along the transmission direction of the refractive power detection light. When the refractive power detection light enters the eye of the person to be measured, it is reflected via the fundus of the eye of the person to be measured to form a refractive detection reflected light, and returns along the original path and is transmitted through the reflector with a central hole (12). The refractive power 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) installed along the transmission direction of the refractive detection reflected light transmitted through the reflector with a central hole (12). The vision testing device according to claim 2, characterized in that it includes the above.

4. The fixation target optical path includes a movable fixation target (11) used to generate a fixation light signal, and a sixth lens (10), the third beam splitter (9), the second beam splitter (8), the fourth beam splitter (5), and the eyepiece lens (4) installed along the transmission direction of the fixation light signal. The eye position monitoring optical path includes a first circumocular illumination light source (301) and a second circumocular illumination light source (302). The first circumocular illumination light source (301) and the second circumocular illumination light source (302) irradiate the eyes of the measurement subject to form a reflected irradiation optical signal. The eye position monitoring optical path further includes the eyepiece lens (4), the fourth beam splitter (5), the seventh beam splitter (6), and the second image sensor (7) installed along the transmission direction of the reflected irradiation optical signal, and an ocular illumination light source (201) and a position measuring device (202) installed to be symmetrically inclined with respect to the central axis of the eyes of the measurement subject. The second image sensor (7) is used to monitor the position of the eyes of the measurement subject and guide the operator and the measurement subject to align the eyes of the measurement subject with the central axis of the eyepiece lens (4). The position measuring device (202) is used to monitor the front-back position of the eyes of the measurement subject with respect to the eyepiece lens (4). The vision testing device according to claim 3, characterized in that

5. A method of operating a vision testing device according to any one of claims 1 to 4, comprising: Step 1: Using the eye position monitoring optical path, determining and guiding the position of the eyes of the measurement subject to complete the alignment of the eyes of the measurement subject; Step 2: Stably causing the measurement subject to fixate on the eyes through the target optical path, and detecting refractive abnormality information for the eyes of the measurement subject through the refractive power detection optical path, and obtaining a detection result of the refractive abnormality information corresponding to the eyes of the measurement subject; Step 3: Using the axial length measurement optical path, collecting interference information formed by the reflected light of the fundus and the cornea of the eyes of the measurement subject; Step 4: Evaluating the vision state of the eyes of the measurement subject based on the detection result of the refractive abnormality information and the measurement result of the axial length, and deriving a conclusion; A method of operating a vision testing device, characterized in that the vision testing device performs the above steps.

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