CN117838036A - A peripheral axial length measurement system, a peripheral axial length development inspection system and a control method - Google Patents

Abstract

The invention discloses a peripheral eye axis measuring system which can measure the peripheral eye axis without contacting eyes of a user so as to establish a retina morphological model, has good safety, improves user experience, adopts infrared light imaging and low-coherence light measurement, has measuring precision reaching a micrometer level and improves measuring precision. The invention also discloses a peripheral eye axis development checking system and a control method, which can judge whether the peripheral far vision defocus exists or not by comparing the position deviation of the imaging outline and the actually measured retina outline after wearing the common single-light lens, thereby providing powerful data support for wearing the defocus lens and controlling the myopia of teenagers.

Description

A peripheral axial length measurement system, a peripheral axial length development inspection system and a control method

Technical Field

The present invention relates to the technical field of axial length measurement, and in particular to a peripheral axial length measurement system, a peripheral axial length development inspection system and a control method.

Background technique

Myopia has become a global public health problem, and early childhood myopia is the focus of high myopia prevention and control. At present, the mechanism of myopia has not been fully elucidated, but animal experimental studies have found that the imaging quality of the peripheral retina is equally important for the growth and development of the eyeball. The peripheral refractive power of myopic patients is more likely to drift toward hyperopia than emmetropia and hyperopia. The possible reason is that the axial axial length of myopic eyes grows faster than the equatorial part, resulting in a shorter peripheral axial length than the central part, so that the focus of light falls behind the peripheral retina. As shown in Figure 1, the front part of the eyeball 1' is the pupil 2' and the cornea 3', the center of the rear fundus is the central retina 4', and the surrounding of the central retina 4' is the peripheral retina 5'. If the imaging contour 7' of a myopic patient wearing an ordinary myopia lens 6' is on the rear side of the peripheral retina 5', it will cause the peripheral axial length to grow too fast, which is not conducive to the control of the axial length development, and it is necessary to wear a defocus lens for correction. As shown in Figure 2, after the patient wears the defocus lens 8', its imaging contour 7' is on the front side of the peripheral retina 5', which can effectively inhibit the growth and development of the peripheral axial length.

MRI studies have shown that the length, width, and height of the eyeballs of myopic patients have increased, but the growth in the long axis direction is the most obvious. Changes in eyeball morphology and retinal curvature may occur before changes in refraction. Therefore, how to measure the growth status of retinal curvature and peripheral eye axis can help predict the occurrence and development of myopia.

In the prior art, methods for obtaining retinal morphological features include ultrasound technology. However, ultrasound technology requires contact with the human eye, and the measurement accuracy is at the millimeter level, which is not precise enough.

In view of this, it is necessary to provide a novel peripheral axial length measurement system, peripheral axial length development inspection system and control method.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a peripheral axial length measurement system that can measure the peripheral axial length without contacting the user's eyes to establish a retinal morphological model. By adopting infrared light imaging and coherence principles, the measurement accuracy can reach the micron level, thereby improving the measurement accuracy.

The purpose of the present invention is to overcome the shortcomings of the prior art and also provide a peripheral axial development inspection system and control method. By comparing the position deviation of the imaging contour after wearing ordinary single-vision lenses with the actual measured retinal contour, it is determined whether there is peripheral hyperopic defocus of the retina, thereby providing strong data support for the wearing of defocus lenses and the control of myopia in adolescents.

The technical solution of the present invention provides a peripheral eye axis measurement system, comprising:

Infrared light source;

A light board, wherein the center of the light board has a light board through hole for the user to observe, and a plurality of lamp beads are evenly distributed on the light board around the light board through hole;

An infrared camera module, wherein a lens of the infrared camera module is coaxially arranged with the through hole of the lamp board, and is used to take an image of the lamp beads of the plurality of lamp beads in the eye;

An interference signal conversion module, the interference signal conversion module is connected to the infrared light source through an optical fiber and is used to convert the optical signal into an electrical signal, and convert the electrical signal into a data signal;

A first beam splitter, the first beam splitter is located between the light board and the infrared camera module, the first beam splitter allows visible light to pass through, and is used to reflect and propagate the infrared light output from the interference signal conversion module toward the through hole of the light board;

A fixation module, the fixation module is located on one side of the axis of the through hole of the light board, and the fixation module has a row of uniformly distributed sight marks;

A reflector, the reflector is located between the fixation module and the light board and is used to reflect the sight mark toward the through hole of the light board;

The data processing module is used to receive the data signals transmitted by the infrared camera module and the interference signal conversion module, and calculate the corneal curvature radius r, the axial length Alp measured when the fixation angle is θ, and the coordinate parameters Yr and Zr of the axial length on the retina.

In one of the optional technical solutions, when the fixation angle is 0, the axial length is Ala, and the coordinate parameters of the axial length on the retina are Ala, 0; when the fixation angle is θ, the axial length is Alp, and the coordinate parameters are Yr, Zr;

Then, Yr = (Alp-r) × sinθ;

Zr＝(Alp-r)×cosθ.

In one of the optional technical solutions, the data processing module outputs the actually measured retinal contour based on the calculated curvature radius r and coordinate parameters.

In one of the optional technical solutions, the reflector is a second beam splitter that is transparent to infrared light;

The second beam splitter is located between the light board and the infrared camera module and on the central axis of the through hole of the light board.

In one of the optional technical solutions, the maximum value of the fixation angle θ is between 60° and 80°.

In one of the optional technical solutions, the infrared light source includes a superluminescent diode, and the central wavelength of the infrared light is 850±50nm.

In one of the optional technical solutions, the interference signal conversion module includes a collimator, and the infrared light is collimated by the collimator and then emitted to the first beam splitter.

In one of the optional technical solutions, the interference signal conversion module includes a sample arm, a reference arm, a fiber coupler, a photoelectric detection module and a data acquisition module;

The light source, the optical fiber coupler and the sample arm are connected via an optical fiber;

The reference arm, the optical fiber coupler and the photoelectric detection module are connected via another optical fiber;

The data acquisition module is connected to the photoelectric detection module by signal, and the data acquisition module is connected to the data processing module by signal;

The return light of the reference arm and the sample arm is coherent in the optical fiber coupler, the photoelectric detection module detects and converts the optical signal into an electrical signal, the data acquisition module performs AD conversion on the collected electrical signal to obtain a data signal, and transmits the data signal to the data processing module for processing.

The technical solution of the present invention further provides a peripheral axial length development inspection system, comprising an optical simulation module and the peripheral axial length measurement system described in any of the above technical solutions;

The data processing module is signal-connected to the optical simulation module;

The optical simulation module includes an eyeball simulation unit, a single vision lens simulation unit and a light emitting simulation unit;

The eyeball simulation unit is used to establish an eyeball model and form a retinal contour for actual measurement;

The single vision lens simulation unit is used to simulate and establish a single vision lens with a preset degree at the front side of the eyeball model;

The light emitting simulation unit is used to simulate emitting multiple groups of parallel light beams to the single vision lens to simulate and obtain an imaging profile;

If the imaging contour is in front of the retinal contour, the requirement is met;

If the imaging contour is located behind the retinal contour, the requirement is not met.

The technical solution of the present invention also provides a control method for a peripheral axial eye development inspection system, comprising the following steps:

S01: According to the data signal transmitted by the data processing module, the eyeball simulation unit is used to establish an eyeball model and form a retinal contour for actual measurement;

S02: The single vision lens simulation unit simulates and establishes a single vision lens of a preset degree at a preset distance in front of the eyeball model;

S03: The light emitting simulation unit simulates emitting multiple groups of parallel light beams to the single vision lens. Each group of parallel light beams will form an intersection point at the fundus of the eyeball model after being refracted by the single vision lens. Multiple intersection points are connected by arc curves to obtain an imaging contour;

S04: If the imaging contour is in front of the retinal contour, the requirement is met;

If the imaging contour is located behind the retinal contour, the requirement is not met.

The above technical solution has the following beneficial effects:

In the peripheral eye axis measurement system provided by the present invention, the user observes the sight marks at different positions of the fixation module, and the infrared camera module can capture the lamp bead imaging diagram of the lamp bead in the eye, and transmit the data signal to the data processing module, and the curvature radius r of the cornea can be calculated through the position of the eye and the imaging of the lamp bead. At the same time, the interference signal conversion module converts the infrared light coherent light signal into an electrical signal, and then converts it into a data signal and transmits it to the data processing module, and calculates the eye axis length Alp measured when the fixation angle is θ and the coordinate parameters Yr and Zr of the eye axis on the retina, so that the actual measured retinal contour can be calculated.

The peripheral axial length measurement system provided by the present invention can measure the peripheral axial length without contacting the user's eyes to establish a retinal morphological model, has good safety, and improves user experience. It adopts infrared light imaging and low-coherence light measurement, and the measurement accuracy can reach the micron level, thereby improving the measurement accuracy.

The peripheral axial growth inspection system and control method provided by the present invention can determine whether there is peripheral retinal hyperopic defocus by comparing the position deviation between the imaging contour after wearing ordinary single-vision lenses and the actually measured retinal contour, thereby providing strong data support for the wearing of defocus lenses and the control of myopia in adolescents. If the imaging contour is on the front side of the retinal contour, it is judged to meet the requirements and OK lenses can be worn to control the growth and development of the axial growth; if the imaging contour is on the back side of the retinal contour, peripheral retinal hyperopic defocus occurs and defocus lenses need to be worn to effectively control the growth and development of the axial growth.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

FIG1 is a schematic diagram showing the image contour at the rear side of the peripheral retina after wearing ordinary myopia glasses;

FIG2 is a schematic diagram showing an image contour in front of the peripheral retina after wearing a defocusing lens;

FIG3 is a schematic diagram of a peripheral eye axis measurement system provided by an embodiment of the present invention;

FIG4 is an image of the lamp beads on the cornea at the first fixation angle;

FIG5 is an image of the lamp beads on the cornea at the second fixation angle;

FIG6 is an image of the lamp beads on the cornea at the third fixation angle;

FIG7 is a schematic diagram showing the coincidence of the line of sight and the measurement light when the fixation angle is 0;

FIG8 is a schematic diagram showing the intersection of the line of sight and the measurement light when the fixation angle is θ;

FIG9 is a signal data diagram of axial length;

FIG10 is a schematic diagram of a model of an eye;

Figure 11 shows the retinal contour actually measured;

FIG12 is a schematic diagram of a peripheral axial growth inspection system provided by an embodiment of the present invention;

FIG. 13 is a schematic diagram of the simulation operation of the optical simulation module.

Detailed ways

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

As shown in Figures 3-10, a peripheral eye axis measurement system provided by an embodiment of the present invention includes an infrared light source 1, a light board 2, an infrared camera module 3, an interference signal conversion module 4, a first beam splitter 5, a fixation module 6, a reflector 7 and a data processing module 8.

The center of the lamp board 2 has a lamp board through hole 21 for the user's eyes 9 to observe, and a plurality of lamp beads 22 are evenly distributed on the lamp board 2 around the lamp board through hole 21 .

The lens of the infrared camera module 3 is coaxially arranged with the through hole 21 of the lamp board, and is used to capture the lamp bead imaging image of the plurality of lamp beads 22 in the eye 9 .

The interference signal conversion module 4 is connected to the infrared light source 1 through an optical fiber, and is used to convert the optical signal into an electrical signal, and convert the electrical signal into a data signal.

The first beam splitter 5 is located between the light board 2 and the infrared camera module 3 . The first beam splitter 5 allows visible light to pass through and is used to reflect and propagate the infrared light output from the interference signal conversion module 4 toward the light board through hole 21 .

The fixation module 6 is located on one side of the axis of the light board through hole 21 , and has a row of uniformly distributed sight marks 61 .

The reflector 7 is located between the fixation module 6 and the light board 2 and is used to reflect the sight mark 61 toward the through hole 21 of the light board.

The data processing module 8 is used to receive the data signals transmitted by the infrared camera module 3 and the interference signal conversion module 4, and calculate the curvature radius r of the cornea 91, the axial length Alp measured when the fixation angle is θ, and the coordinate parameters Yr and Zr of the axial length on the retina 92.

The peripheral eye axis measurement system provided by the invention is used in a biometer.

The infrared light source 1 adopts an SLD light source, which has a wider spectrum width and lower coherence.

The light board 2 is a circular light board with a circular light board through hole 21 at the center thereof, through which the user's eye 9 can observe the sight mark 61 of the fixation module 6. The light board 2 has a plurality of lamp beads 22, which surround the light board through hole 21 and are evenly distributed. The lamp beads 22 are LED lamp beads. The lamp beads 22 are used to illuminate the eye 9 on the one hand so that the infrared camera module 3 can take pictures, and on the other hand, the curvature radius r of the cornea 91 can be calculated by taking pictures of the lamp bead images of the plurality of lamp beads 22 on the cornea 91.

The lens of the infrared camera module 3 is coaxially arranged with the light board through hole 21 , which is located at the rear side of the light board 2 .

The infrared camera module 3 is used to capture the lamp bead imaging diagram of multiple lamp beads 22 in the eye 9. When the eye 9 looks at different sight marks 61, the eyeball rotates and the measured eye axis position is different. As shown in Figures 7-8, the solid line F is the measurement light direction, and the dotted line E is the direction of the line of sight. As shown in Figures 4-6, when the eye 9 looks at different sight marks 61, different lamp bead imaging diagrams are obtained. The distance between the eye 9 and the light board 2 is fixed. The data processing module 8 can calculate the curvature radius r of the cornea 91 through the position of the eye 9 and multiple sets of lamp bead imaging diagrams. Assuming that the distance between the lamp bead 22 and the focus of the cornea 91 is L, the actual radius of the lamp bead 22 is r ₁ , and the radius of the lamp bead 22 in the lamp bead imaging diagram is r ₂ , then the image magnification is r ₁ /r ₂ , and the curvature radius of the cornea 91 is r=2L×r ₁ /r ₂ .

The interference signal conversion module 4 is used, on the one hand, to transmit the infrared light emitted by the infrared light source 1 to the first beam splitter 5. The interference signal conversion module 4 is used, on the other hand, to convert the interference light signal into an electrical signal, and then convert the electrical signal into a data signal, to obtain the data of the eye 9, and transmit the data signal to the data processing module 8. The data processing module 8 can calculate the axial length Alp measured when the fixation angle is θ and the coordinate parameters Yr and Zr of the axial length on the retina 92 based on the obtained data, so as to calculate the actual measured retinal contour G.

The first beam splitter 5 is transparent to visible light and reflects infrared light. The first beam splitter 5 is located on the optical path between the light board 2 and the infrared camera module 3. The infrared light output from the interference signal conversion module 4 is reflected by the first beam splitter 5 and propagates along the path A toward the light board through hole 21, and then reflected by the eye 9 and propagates along the river path B to the infrared camera module 3, and the infrared camera module 3 captures the image.

The fixation module 6 is offset on one side of the axis of the light board through hole 21. The fixation module 6 can be a display or a panel. The fixation module 6 has a row of uniformly distributed sight marks 61. When the fixation module 6 adopts a display, a sight mark 61 at a position can be displayed separately each time. The sight mark 61 is a mark for the user to observe, and can also be a logo graphic, number, letter, cross symbol, etc.

In the present invention, when the eye 9 observes different sight marks 61, the angle between the measured light and the sight line is called the fixation angle. When the human eye fixes on different sight marks 61, the measured light and the visual axis of the human eye form an angle θ. The farther the fixation sight mark 61 is offset from the center, the larger the angle θ is, and the larger the retinal range measured is.

The reflector 7 is located on the optical path between the fixation module 6 and the light board 2. The reflector 7 is used to reflect the sight mark 61 toward the through hole 21 of the light board so that the user can see the sight mark 61. As shown in Figures 3-8, when the user observes the sight mark 61 in the middle, the sight mark 61 propagates along the optical path D, the measuring light coincides with the line of sight, the fixation angle θ=0, and the lamp bead imaging diagram is roughly as shown in Figure 4; when the user observes the sight mark 61 at the edge, the sight mark 61 propagates along the optical path C, the measuring light coincides with the line of sight, the fixation angle θ＞0, and the lamp bead imaging diagram can be as shown in Figures 5 or 6

The data processing module 8 can be a chip, a processor, etc. The data processing module 8 can receive the data signals transmitted by the infrared camera module 3 and the interference signal conversion module 4, and finally calculate the curvature radius r of the cornea 91, the axial length Alp measured when the fixation angle is θ, and the coordinate parameters Yr and Zr of the axial length on the retina 92 when the fixation angle is θ, Yr is the distance between the point where the axial length falls on the retina 92 and the central axial length, and Zr is the distance between the point where the axial length falls on the retina 92 and the focus of the cornea 91. After calculating the above data, the morphological model of the retina 92 can be established, the actual measured retinal contour G can be obtained, and the state of the peripheral axial length can be obtained to provide basic data for subsequent inspection and judgment.

As shown in Figure 9, the horizontal axis in Figure 9 represents length, the vertical axis represents the amplitude of light, 91′ represents the position signal data of the cornea 91, and 92′ represents the position signal data of the retina 92. The axial length of the eye can be obtained by subtracting the horizontal axes of the two. The axial lengths Ala and Alp in the present invention can be obtained from this figure.

In summary, the peripheral axial length measurement system provided by the present invention can measure the peripheral axial length without contacting the user's eyes 9 to establish a morphological model of the retina 92. It has good safety and improves the user experience. It uses infrared light imaging and low-coherence light measurement, and the measurement accuracy can reach the micron level, thereby improving the measurement accuracy.

In one embodiment, as shown in FIG. 10 , when the fixation angle is 0, the axial length is Ala, and the coordinate parameters of the axial length on the retina 92 are Ala, 0; when the fixation angle is θ, the axial length is Alp, and the coordinate parameters are Yr, Zr.

Then, Yr = (Alp-r) × sinθ, Zr = (Alp-r) × cosθ.

In this embodiment, when the center of the eye 9 is fixed, the axial length of the eye is measured to be Ala, and its YZ coordinates are set to Ala, 0. When the fixation angle is θ, the axial length of the eye is measured to be Alp.

According to geometric optics calculation, the coordinate parameters of the eye axis on the retina 92 when the fixation angle is θ, Yr and Zr, can be calculated. As shown in FIG10 , Yr, Zr and (Alp-r) form a right triangle, (Alp-r) is the hypotenuse of the right triangle, and Yr = (Alp-r) × sinθ, Zr = (Alp-r) × cosθ can be calculated according to trigonometric functions.

In one embodiment, as shown in Fig. 11, the data processing module 8 outputs the actually measured retinal contour G according to the calculated curvature radius r and coordinate parameters. The retinal contour G can be displayed as a specific image through a display for the user to observe and judge.

In one embodiment, as shown in Fig. 3, the reflector 7 is a second beam splitter that is transparent to infrared light. The second beam splitter is located between the light board 2 and the infrared camera module 3 and on the central axis of the through hole 21 of the light board.

In this embodiment, the reflector 7 adopts a second beam splitter, which can transmit infrared light and reflect visible light. Therefore, the second beam splitter can be arranged on the optical path between the light board 2 and the infrared camera module 3, which is convenient for arrangement and helps to reduce the volume of the biometer.

In one embodiment, the maximum value of the fixation angle θ is between 60°-80°, that is, the maximum angle of the fixation angle θ is between 60°-80°, which means that the maximum measurement angle is 60°-80°, so as to cover the angle that the pupil can rotate, thereby improving the comprehensiveness and accuracy of the measurement results.

In one embodiment, the infrared light source 1 includes a superluminescent diode, and the central wavelength of the infrared light is 850±50nm, which has a good measurement effect.

In one embodiment, the interference signal conversion module 4 includes a collimator, and the infrared light is collimated by the collimator and then emitted to the first beam splitter 5 , thereby improving the accuracy of the interference signal conversion module 4 transmitting light to the first beam splitter 5 .

In one embodiment, as shown in FIG. 3 , the interference signal conversion module 4 includes a sample arm 41 , a reference arm 42 , a fiber coupler 43 , a photoelectric detection module 44 and a data acquisition module 45 .

The light source, the fiber coupler 43 and the sample arm 41 are connected via an optical fiber.

The reference arm 42, the fiber coupler 43 and the photoelectric detection module 44 are connected by another optical fiber.

The data acquisition module 45 is signal-connected to the photoelectric detection module 44 , and the data acquisition module 45 is signal-connected to the data processing module 8 .

The return light from the reference arm 42 and the sample arm 41 is coherent in the fiber coupler 43, the photoelectric detection module 44 detects and converts the optical signal into an electrical signal, the data acquisition module 45 performs AD conversion on the collected electrical signal to obtain a data signal, and transmits the data signal to the data processing module 8 for processing.

The sample arm 41, the reference arm 42 and the fiber coupler 43 are used for infrared interference. The infrared light from the sample arm 41 is transmitted to the first beam splitter 5 through the collimator, and then reflected by the eye 9. The reflector in the reference arm 42 continuously changes the optical path through the motor movement. The return light from the reference arm 42 and the sample arm 41 interferes in the fiber coupler 43.

The photoelectric detection module 44 detects the interfering light signal and converts the interfering light signal into an electrical signal. The data acquisition module 45 collects the electrical signal and then performs AD conversion on the collected electrical signal to obtain a data signal. The data acquisition module 45 transmits the data signal to the data processing module 8 for processing.

As shown in FIGS. 12-13 , a peripheral axial growth examination system provided in one embodiment of the present invention includes an optical simulation module 10 and the peripheral axial growth measurement system described in any of the aforementioned embodiments.

The data processing module 8 is signal-connected to the optical simulation module 10 .

The optical simulation module 10 includes an eyeball simulation unit 101 , a single vision lens simulation unit 102 and a light emitting simulation unit 103 .

The eyeball simulation unit 101 is used to establish an eyeball model 1011 and form a retinal contour G that is actually measured.

The single vision lens simulation unit 102 is used to simulate and establish a single vision lens 1021 of a preset degree on the front side of the eyeball model 1011 .

The light emitting simulation unit 103 is used to simulate emitting a plurality of parallel light beams 1031 to the single vision lens 1021 to simulate and obtain an imaging profile H.

If the imaging contour H is in front of the retinal contour G, the requirement is met.

If the imaging contour H is behind the retinal contour G, it does not meet the requirements.

The peripheral axial growth inspection system provided by the present invention is used to determine whether it is necessary to wear a defocus lens.

The peripheral axial length development inspection system comprises an optical simulation module 10 and a peripheral axial length measurement system.

For the composition and working principle of the peripheral axial length measurement system, please refer to the previous description of the peripheral axial length measurement system, which will not be repeated here.

The optical simulation module 10 is used for simulation modeling and can be implemented by optical simulation software, for example, using ZEMAX software.

The optical simulation module 10 includes an eyeball simulation unit 101 , a single vision lens simulation unit 102 and a light emitting simulation unit 103 .

The eyeball simulation unit 101 simulates and establishes an eyeball model 1011 according to the eye parameter signal data transmitted by the data processing module 8, and generates the actually measured retinal contour G. The above eye parameter signal data includes axial data, corneal data, corneal curvature radius data, retinal data, axial coordinate parameter data, etc.

According to the visual acuity of the subject, or the visual acuity measured by the ophthalmometer, a preset degree, for example, 200°, is provided to the single vision lens simulation unit 102. The single vision lens simulation unit 102 simulates and establishes a single vision lens 1021 of the preset degree at about 12 mm in front of the eyeball model 1011. The single vision lens 1021 is a myopia lens.

The light emitting simulation unit 103 is used to simulate the geometric imaging of an infinitely distant object at the fundus. The light emitting simulation unit 103 simulates emitting multiple groups of parallel light beams 1031 to the single-vision lens 1021. Each group of parallel light beams 1031 will form an intersection 1032 at the fundus of the eyeball model 1011 after being refracted by the single-vision lens 1021. The multiple intersections 1032 are connected by arc curves to obtain the imaging profile H.

If the imaging contour H is in front of the retinal contour G, it meets the requirements, indicating that the subject does not need to wear a defocusing lens and wearing an OK lens can control the growth and development of the eye axis.

If the imaging contour H is behind the retinal contour G, it does not meet the requirements, indicating that the subject needs to wear a defocusing lens to control the growth and development of the eye axis.

Specifically, by comparing the imaging profile H after wearing the single-vision lens 1021 with the actually measured retinal profile G, it can be known whether the peripheral eye axis is defocused after wearing the single-vision lens 1021. Taking Figure 13 as an example, the actually measured retinal profile G is the dotted line part, and the imaging profile H of the infinite object distance imaging after wearing the single-vision lens 1021 is the solid line. Because the solid line does not coincide with the dotted line, and the solid line is outside or behind the dotted line, while the dotted central vision is corrected after wearing the single-vision lens 1021, the peripheral eye axis is in a defocused state. According to the "focus growth principle", it is not conducive to the development of the eye axis. Therefore, it is necessary to further prevent and control myopia through means such as defocusing lenses.

As shown in FIGS. 12-13 , a control method of a peripheral axial growth inspection system provided by an embodiment of the present invention includes the following steps:

S01: According to the data signal transmitted from the data processing module 8, the eyeball simulation unit 101 is used to establish an eyeball model 1011 and form a retinal contour G that is actually measured.

S02 : The single vision lens simulation unit 102 simulates and establishes a single vision lens 1021 of a preset degree at a preset distance in front of the eyeball model 1011 .

S03: The light emitting simulation unit 103 simulates emitting multiple groups of parallel light beams 1031 to the single-vision lens 1021. Each group of parallel light beams 1031 will form an intersection 1032 on the fundus of the eyeball model 1011 after being refracted by the single-vision lens 1021. The multiple intersections 1032 are connected by arc curves to obtain an imaging contour H.

S04: If the imaging contour H is in front of the retinal contour G, the requirement is met.

If the imaging contour H is behind the retinal contour G, it does not meet the requirements.

The control method of the peripheral axial growth inspection system provided by the present invention is used to determine whether it is necessary to wear a defocus lens, and the steps are as follows:

In the first step, the data processing module 8 transmits the eye parameter signal data to the optical simulation module 10. The above eye parameter signal data includes eye axis data, corneal data, corneal curvature radius data, retinal data, eye axis coordinate parameter data and the like.

The eyeball simulation unit 101 simulates and establishes an eyeball model 1011 according to the above-mentioned eye parameter signal data, and generates a retinal contour G that is actually measured.

Step 2: According to the visual acuity of the subject, or the visual acuity measured by the ophthalmometer, a preset degree, such as 200°, is provided to the single vision lens simulation unit 102. The single vision lens simulation unit 102 will simulate and establish a single vision lens 1021 of the preset degree at about 12 mm in front of the eyeball model 1011. The single vision lens 1021 is a myopia lens.

Step 3: The light emitting simulation unit 103 simulates the geometric imaging of an infinitely distant object at the fundus. Specifically, the light emitting simulation unit 103 simulates emitting multiple groups of parallel light beams 1031 to the single-vision lens 1021. Each group of parallel light beams 1031 will form an intersection 1032 at the fundus of the eyeball model 1011 after being refracted by the single-vision lens 1021. The multiple intersections 1032 are connected by arc curves to obtain the imaging profile H.

Step 4: Make a judgment: If the imaging contour H is in front of the retinal contour G, it meets the requirements, indicating that the subject does not need to wear a defocus lens, and wearing an OK lens can control the growth and development of the eye axis.

If the imaging contour H is behind the retinal contour G, it does not meet the requirements, indicating that the subject needs to wear a defocusing lens to control the growth and development of the eye axis.

Specifically, by comparing the imaging profile H after wearing the single-vision lens 1021 with the actually measured retinal profile G, it can be known whether the peripheral eye axis is defocused after wearing the single-vision lens 1021. Taking Figure 13 as an example, the actually measured retinal profile G is the dotted line part, and the imaging profile H of the infinite object distance imaging after wearing the single-vision lens 1021 is the solid line. Because the solid line does not coincide with the dotted line, and the solid line is outside or behind the dotted line, while the dotted central vision is corrected after wearing the single-vision lens 1021, the peripheral eye axis is in a defocused state. According to the "focus growth principle", it is not conducive to the development of the eye axis. Therefore, it is necessary to further prevent and control myopia through means such as defocusing lenses.

In summary, the peripheral axial growth inspection system and control method provided by the present invention can determine whether there is peripheral retinal hyperopic defocus by comparing the position deviation between the imaging contour H after wearing ordinary single-vision lenses and the actually measured retinal contour G, thereby providing strong data support for the wearing of defocus lenses and the control of myopia in adolescents. If the imaging contour H is on the front side of the retinal contour G, it is judged to meet the requirements, and OK lenses can be worn to control the growth and development of the axial length. If the imaging contour H is on the back side of the retinal contour G, peripheral retinal hyperopic defocus occurs, and defocus lenses need to be worn to effectively control the growth and development of the axial length.

As needed, the above technical solutions can be combined to achieve the best technical effect.

The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered as the protection scope of the present invention.

Claims (10)

1. A peripheral eye axis measurement system, comprising: Infrared light source; A light board, wherein the center of the light board has a light board through hole for the user to observe, and a plurality of lamp beads are evenly distributed on the light board around the light board through hole; An infrared camera module, wherein a lens of the infrared camera module is coaxially arranged with the through hole of the lamp board, and is used to take an image of the lamp beads of the plurality of lamp beads in the eye; An interference signal conversion module, the interference signal conversion module is connected to the infrared light source through an optical fiber and is used to convert the optical signal into an electrical signal, and convert the electrical signal into a data signal; A first beam splitter, the first beam splitter is located between the light board and the infrared camera module, the first beam splitter allows visible light to pass through, and is used to reflect and propagate the infrared light output from the interference signal conversion module toward the through hole of the light board; A fixation module, the fixation module is located on one side of the axis of the through hole of the light board, and the fixation module has a row of uniformly distributed sight marks; A reflector, the reflector is located between the fixation module and the light board and is used to reflect the sight mark toward the through hole of the light board; The data processing module is used to receive the data signals transmitted by the infrared camera module and the interference signal conversion module, and calculate the corneal curvature radius r, the axial length Alp measured when the fixation angle is θ, and the coordinate parameters Yr and Zr of the axial length on the retina. 2. The peripheral axial length measurement system according to claim 1, characterized in that: When the fixation angle is 0, the axial length is Ala, and the coordinate parameters of the axial length on the retina are Ala, 0; when the fixation angle is θ, the axial length is Alp, and the coordinate parameters are Yr, Zr; Then, Yr = (Alp-r) × sinθ; Zr＝(Alp-r)×cosθ. 3. The peripheral axial length measurement system according to claim 2 is characterized in that the data processing module outputs the actually measured retinal contour according to the calculated curvature radius r and coordinate parameters. 4. The peripheral eye axis measurement system according to claim 1, characterized in that the reflector is a second beam splitter that is transparent to infrared light; The second beam splitter is located between the light board and the infrared camera module and on the central axis of the through hole of the light board. 5 . The peripheral eye axis measurement system according to claim 1 , wherein the maximum value of the fixation angle θ is between 60° and 80°. 6. The peripheral axial length measurement system according to claim 1 is characterized in that the infrared light source comprises a superluminescent diode, and the central wavelength of the infrared light is 850±50nm. 7 . The peripheral eye axis measurement system according to claim 1 , wherein the interference signal conversion module comprises a collimator, and the infrared light is collimated by the collimator and then emitted to the first beam splitter. 8. The peripheral eye axis measurement system according to claim 1, characterized in that the interference signal conversion module includes a sample arm, a reference arm, a fiber coupler, a photoelectric detection module and a data acquisition module; The light source, the optical fiber coupler and the sample arm are connected via an optical fiber; The reference arm, the optical fiber coupler and the photoelectric detection module are connected via another optical fiber; The data acquisition module is connected to the photoelectric detection module by signal, and the data acquisition module is connected to the data processing module by signal; The return light of the reference arm and the sample arm is coherent in the optical fiber coupler, the photoelectric detection module detects and converts the optical signal into an electrical signal, the data acquisition module performs AD conversion on the collected electrical signal to obtain a data signal, and transmits the data signal to the data processing module for processing. 9. A peripheral axial length development inspection system, characterized by comprising an optical simulation module and the peripheral axial length measurement system according to any one of claims 1 to 8; The data processing module is signal-connected to the optical simulation module; The optical simulation module includes an eyeball simulation unit, a single vision lens simulation unit and a light emitting simulation unit; The eyeball simulation unit is used to establish an eyeball model and form a retinal contour for actual measurement; The single vision lens simulation unit is used to simulate and establish a single vision lens with a preset degree at the front side of the eyeball model; The light emitting simulation unit is used to simulate emitting multiple groups of parallel light beams to the single vision lens to simulate and obtain an imaging profile; If the imaging contour is in front of the retinal contour, the requirement is met; If the imaging contour is located behind the retinal contour, the requirement is not met. 10. A control method for the peripheral axial eye development inspection system according to claim 9, characterized in that it comprises the following steps: S01: According to the data signal transmitted by the data processing module, the eyeball simulation unit is used to establish an eyeball model and form a retinal contour for actual measurement; S02: The single vision lens simulation unit simulates and establishes a single vision lens of a preset degree at a preset distance in front of the eyeball model; S03: The light emitting simulation unit simulates emitting multiple groups of parallel light beams to the single vision lens. Each group of parallel light beams will form an intersection point at the fundus of the eyeball model after being refracted by the single vision lens. Multiple intersection points are connected by arc curves to obtain an imaging contour; S04: If the imaging contour is in front of the retinal contour, the requirement is met; If the imaging contour is located behind the retinal contour, the requirement is not met.