CN113440098A

CN113440098A - Full-automatic human eye visual inspection device and method

Info

Publication number: CN113440098A
Application number: CN202110632153.8A
Authority: CN
Inventors: 齐岳; 孟庆宾; 黄贵军; 张锟; 王雪乔
Original assignee: Tianjin Suowei Electronic Technology Co ltd
Current assignee: Tianjin Suowei Electronic Technology Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2021-09-28

Abstract

The invention relates to a full-automatic human eye visual inspection device, which consists of a light path component and a three-dimensional motion platform, wherein the light path component is fixed at the upper end of the three-dimensional motion platform, and is aligned with human eyes by the motion of the three-dimensional motion platform in X, Y, Z three directions; the curvature measuring system is used for measuring the curvature of the cornea of the human eye; the automatic focusing system is used for positioning human eyes. The invention also relates to a full-automatic human eye visual inspection method. The invention can automatically measure the visual optical parameters of human eye diopter, corneal curvature, pupil diameter and the like in a non-contact mode, is convenient to operate and high in efficiency, and is a device and a method with higher innovation.

Description

Full-automatic human eye visual inspection device and method

Technical Field

The invention belongs to the technical field of eye vision optics, and relates to a device for comprehensively checking the eye vision function by using a near-infrared light source as a measuring light source and an optical lens and a camera, in particular to a full-automatic eye vision checking device and method.

Background

Myopia and ametropia are listed as one of three major eye diseases in the world, China is a big myopia country, the number of myopia people is nearly 4 hundred million, and teenagers are about 2.7 hundred million. In 2018, the incidence rate of myopia of students in China is second in the world, and the number of myopia people is first in the world. Therefore, the education department and the national health committee aim to bring the myopia prevention and control work of children and teenagers, the total myopia rate and the physical health condition into government performance assessment indexes. In order to better prevent and control myopia, the myopia screening frequency needs to be enhanced, and early intervention is discovered early. Relevant policies and guidance suggestions are also provided by national departments, and the primary and secondary schools are required to perform diopter check for students every half year and conditionally perform diopter check once every quarter, and visual health files are established. Because the population base of China is huge, the fertility rate of developed countries is relatively high. Therefore, refractive screening efforts for children and adolescents are enormous.

The common application scenes of optometry equipment in the current market are hospitals, optometry centers, spectacle shops and other places. The operation of the device is performed by a physician, optometrist or other person with a professional background. However, the screening work is mainly performed in schools and is performed by teachers. This requires a simplified and highly automated operation of the device.

Patent CN104095610B realizes a device for measuring diopter and corneal curvature of human eye. The method needs manual alignment, has high operation requirement and more time consumption for measurement, and is difficult to meet the requirement of large-scale refractive screening. In order to deal with large-scale refraction screening scenes, a product with high measuring speed, simple and convenient operation, high efficiency and high automation degree is urgently needed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a full-automatic human eye visual inspection device and method which have high measurement speed and can automatically measure a plurality of biological parameters such as binocular diopter, corneal curvature, pupil diameter and the like.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

the full-automatic human eye visual inspection device is composed of a light path component and a three-dimensional motion platform, wherein the light path component is fixed at the upper end of the three-dimensional motion platform, and the alignment with human eyes is completed through the motion of the three-dimensional motion platform in X, Y, Z three directions, and the full-automatic human eye visual inspection device is characterized in that: the light path component consists of a refraction measuring system, a curvature measuring system and an automatic focusing system, wherein the refraction measuring system is used for measuring the diopter of human eyes; the curvature measuring system is used for measuring the curvature of the cornea of the human eye; the automatic focusing system is used for positioning human eyes.

Moreover, the refraction measuring system consists of a projection light path, a refraction measuring light path and a fog light path,

the projection light path consists of a refraction measurement light source, a condenser, a middle hole reflector, a refraction ocular lens and a spectroscope, wherein the condenser is arranged in front of the refraction measurement light source and projects collected light onto the middle hole reflector in front of the condenser, and the middle hole reflector sequentially projects the light onto the eyeground through the refraction ocular lens and the spectroscope arranged in front of the middle hole reflector to form a converged light spot;

the refraction measurement optical path is composed of a spectroscope, a refraction ocular lens, a middle hole reflector, an annular diaphragm, a conical lens, a refraction measurement objective lens and a refraction measurement camera, the spectroscope reflects light spots converged by the eyeground to the refraction ocular lens behind the spectroscope, the refraction ocular lens forms a light ring on the refraction measurement camera through the middle hole reflector, the annular diaphragm, the conical lens and the refraction measurement objective lens in sequence, and the diopter information of the measured eye is obtained through analysis of the light ring shape;

the fog-vision optical path is used for guiding the human eye crystals to relax during the refraction measurement, so that the influence of the human eye crystal adjustment on the measurement result is eliminated, and the fog-vision optical path is composed of a sighting target, a refraction compensation lens, a relay lens, a dichroic mirror, a curvature ocular lens and a spectroscope.

Moreover, the refraction measurement light source is a near-infrared band incoherent light source, and the central wavelength range is 700 nm-1100 nm;

the condenser lens is an optical lens and is used for collecting and converging light rays emitted by the refraction measuring light source, and the focal length range of the condenser lens is 10 mm-50 mm;

the middle hole reflector is a plane reflector with a hole in the center, the diameter range of a small hole in the center is 0.5-2.5mm, and when the middle hole reflector is used for projecting a light path, the middle hole reflector is used for projecting light rays emitted by a refraction measuring light source to the fundus to form light spots; when used in a refraction measurement optical path, the function of the optical path is to reflect light reflected from the fundus into the refraction measurement camera;

the refraction ocular lens is an optical lens, and the focal length range is 30-100 mm; when the device is used for projecting the light path, the device has the function of projecting the light rays emitted by the refraction measuring light source on the eyeground to form a convergent light spot; when the device is used for a refraction measurement light path, the device has the function of collecting light reflected by human eyes at the fundus convergence facula and is used for measuring diopter;

the spectroscope is an optical transreflector, can selectively transmit or reflect light according to wave bands, is a common optical element of a plurality of light paths, and has the function of reflecting the light of the near-infrared wave band to which the refraction measurement light source belongs, and transmitting the light of the near-infrared wave band to which the curvature measurement light source belongs and the light of the visible light wave band to which the fog visual target belongs.

And the dioptric ocular lens is arranged by deflection on the optical axis, and the deflection angle is 3-10 degrees.

The annular diaphragm is an optical element, an annular area on the annular diaphragm can transmit light, other areas can block light, and the position of the annular diaphragm on the optical axis is optically conjugated with the cornea of the human eye;

the conical lens is an optical lens, the surface of the conical lens is a conical surface, and the included angle between the conical surface and the plane is 3-10 degrees;

the refraction measurement objective lens is an optical lens and is used for ensuring that an image plane of a refraction measurement light path is positioned on the refraction measurement camera;

the refraction measurement camera is a CCD or CMOS camera, has a photosensitive area not larger than 1 inch and a resolution not lower than 30 ten thousand pixels, is positioned on an image plane of a refraction measurement light path, and forms an image for later analysis.

Moreover, the curvature measuring system is composed of a curvature illuminating module and a curvature measuring optical path,

the curvature lighting module comprises a lighting lamp plate, a near-infrared band LED light source and two focusing light sources, wherein one or more concentric rings are arranged on the lighting lamp plate, each concentric ring comprises a plurality of LED light sources with near-infrared bands which are uniformly distributed at intervals, the two focusing light sources are symmetrically arranged on two sides of the lighting lamp plate, and the included angle between each focusing light source and the lighting lamp plate is 20-70 degrees;

the curvature measurement light path is composed of a spectroscope, a curvature ocular lens, a dichroic mirror, a curvature measurement objective lens and a curvature measurement camera, the spectroscope is arranged behind the curvature lighting module, light rays of near infrared wave bands reflected by human eye cornea are transmitted through the spectroscope and collected on the curvature ocular lens, the light rays are reflected to the curvature measurement objective lens through the dichroic mirror, and the curvature measurement objective lens is used for ensuring that an image plane of a curvature measurement light path is located on the curvature measurement camera and enabling the size of the image to be matched with the photosensitive area of the curvature measurement camera.

Moreover, the central wavelength of the near-infrared band LED light source is 700 nm-1100 nm;

the focusing light source is a near-infrared band collimation light source, and the central wavelength of the focusing light source is the same as or similar to that of a near-infrared band LED light source;

the curvature ocular lens is an optical lens, and the focal length range is 50 mm-160 mm;

the dichroic mirror is an optical transflective mirror and is used for transmitting visible light rays emitted by a sighting mark in the fog-vision light path and reflecting near infrared rays for curvature measurement;

the curvature measurement objective lens is an optical lens and is used for ensuring that an image plane of a curvature measurement optical path is positioned on the curvature measurement camera and enabling the size of an image to be matched with the photosensitive area of the curvature measurement camera;

the curvature measuring camera is a CCD or CMOS camera, the photosensitive area is not more than 1 inch, the resolution is not less than 30 ten thousand pixels, and the curvature measuring camera is located on the image plane of the curvature measuring light path to form an image for later analysis.

The automatic focusing system is composed of two groups of imaging modules which are symmetrically distributed on two sides of the curvature lighting module at a certain included angle, and the included angle range is 20-70 degrees; the imaging module consists of an imaging lens and an imaging camera positioned at the rear part of the imaging lens.

Moreover, the imaging lens is a piece of optical lens or a group of optical lenses, the focal length of the optical lens is not more than 50mm, the imaging field of view is not less than 50 degrees, and the aperture is not less than F # 12;

the imaging camera is a CCD or CMOS camera, the photosensitive area is not more than 1 inch, the resolution is not less than 30 ten thousand pixels, the imaging camera is positioned on the back focal plane of the imaging lens, the pupil of the human eye is imaged, and the human eye is positioned by analyzing the position of the pupil.

A full-automatic human eye visual inspection method is characterized in that: the method comprises the following steps:

resetting the three-dimensional motion platform to X, Y, Z triaxial centered position;

step two, starting measurement, moving the three-dimensional platform 30mm to the left, detecting the left eye pupil by the automatic focusing system, and calculating the deviation of the current pupil position and the preset measurement position in three directions;

the preset measuring position is a position where the visual axis is coincident with the optical axis of the machine and the vertex of the cornea is located at the standard working distance of the equipment;

driving the three-dimensional motion platform according to the deviation calculated in the second step to enable the left eye pupil to move to a preset measurement position, and finishing X, Y, Z coarse alignment; at the moment, a clearer concentric ring image can be obtained from the curvature measuring camera, and the deviation between the central coordinate of the concentric ring and the X, Y direction of the preset measuring position is calculated;

driving the three-dimensional motion platform according to the deviation calculated in the step three to finish X, Y direction fine alignment; at the moment, a focusing light spot can be detected in the curvature measuring camera, and the Z-direction deviation of the current corneal vertex and a preset measuring position can be calculated through the position of the focusing light spot; if the detection fails, the Z-direction deviation is over large, and at the moment, the automatic focusing system is called again for alignment;

step five, driving the three-dimensional motion platform according to the deviation calculated in the step four to finish the Z-direction precise alignment; after alignment, a curvature measurement camera acquires images to measure the corneal curvature; after the refraction measurement is finished, starting a refraction measurement light source and a refraction measurement camera to perform refraction measurement;

step six, after the refraction measurement is finished, the refraction measurement light source and the refraction measurement camera are closed; meanwhile, the three-dimensional motion platform automatically moves rightwards to a position which is 30mm away from the right side of the center, and the right eye is automatically measured;

and seventhly, after the binocular measurement is finished, the three-dimensional platform automatically resets to wait for the next measurement.

The invention has the advantages and positive effects that:

1. the invention adopts a refraction measuring system without a refraction compensation module, and omits a complex motion structure and circuit control. The structure is compact and simple, and the integration with other functional modules and the production and debugging are convenient. Different from the traditional ring thickness method, the invention adopts a brand-new optical design and uses the conical lens to convert the eyeground reflection light spots of the human eyes with different diopters into the circular rings with different diameters so as to obtain the refraction information of the human eyes.

2. The refraction measurement light source is designed into a near-infrared waveband incoherent light source, namely a non-laser light source, and the incoherent light source has the advantages that speckles are not formed as the coherent light source, so that the influence of the speckles on the measurement precision is avoided.

3. By adopting a double-camera structure (two imaging cameras in an automatic focusing system), pupils are automatically identified, and the spatial coordinates of the pupils are accurately positioned through a binocular stereo vision algorithm. And the three-dimensional motion platform can be driven to automatically align with human eyes and measure binocular vision parameters. The operation steps of manual alignment and measurement are omitted, and the screening efficiency is greatly improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the optical path components of the fully automatic human eye vision inspection device of the present invention;

FIG. 2 is a schematic diagram of a self-aligning module configuration;

FIG. 3 is a calibration checkerboard diagram;

FIG. 4 is an image of an auto focus system imaging camera, a being an image taken by camera 1 and b being an image taken by camera 2;

fig. 5 is a measurement flow chart.

Description of reference numerals:

1-refraction measuring light source, 2-condenser, 3-mesopore reflector, 4-refraction measuring camera, 5-refraction measuring objective, 6-conical lens, 7-refraction ocular lens, 8-imaging camera, 9-imaging lens, 10-focusing light source, 11-curvature lighting module, 12-eye, 13-spectroscope, 14-curvature ocular lens, 15-dichroic mirror, 16-relay lens, 17-refraction compensation lens, 18-sighting mark, 19-curvature measuring camera, 20-curvature measuring objective, 21-imaging camera I, 22-imaging camera II and 23-annular diaphragm.

Detailed Description

The following detailed description of specific embodiments of the invention is provided in conjunction with the accompanying drawings:

the embodiment of the invention relates to equipment and a method for automatically measuring visual optical parameters such as human eye diopter, corneal curvature, pupil diameter and the like in a non-contact mode. In the following description, the direction in which the device moves forward and backward with respect to the patient's eye 12 is set as the Z-axis, the direction perpendicular to the Z-axis and parallel to the ground is set as the X-axis, and the direction perpendicular to the Z-axis and also perpendicular to the ground is set as the Y-axis.

The device of the embodiment mainly comprises a light path component and a three-dimensional motion platform. The optical path component consists of a refraction measuring system, a curvature measuring system and an automatic focusing system. As shown in fig. 1, the refractive measurement system includes a projection light path, a refractive measurement light path, and a fog light path. Wherein, the projection light path comprises a refraction measurement light source 1, a condenser lens 2, a mesopore reflector 3, a refraction ocular lens 7 and a spectroscope 13. Wherein the meso-porous reflector and the refractive eyepiece are shared with the refractive measurement light path. The spectroscope is shared with a refraction measuring light path and a fog light path.

Wherein, the refraction measurement light source is an LED with the central wavelength of 850 nm.

Wherein, the condensing lens is an aspheric condensing lens with a focal length of 25 mm.

Wherein, the mesopore reflector is a plane reflector with a hole at the center, and the diameter of the small hole is 1.5 mm. For projecting a light path that functions to pass light from the refraction measuring light source; for use in a refraction measurement optical path that functions to reflect light reflected back from the fundus into the refraction measurement camera. Since the aperture in the central region does not reflect light, the light reflected back from the fundus after reflection becomes a ring of light and no longer a spot. On the optical axis, the central aperture and the human eye crystal are optically conjugated (in an object-image relationship with each other). Thus, the aperture also prevents light emitted by the refraction measuring light source that is reflected by the central region of the eye's lens from entering the refraction measuring camera. The interference of the light on the refraction measurement is avoided, and the measurement accuracy is ensured.

Wherein, the dioptric eyepiece is a biconvex lens with a focal length of 50mm and has an inclination angle of 8 degrees. When the device is used for projecting the light path, the device has the function of projecting the light rays emitted by the refraction measuring light source on the eyeground to form a convergent light spot; when the device is used for a refraction measurement light path, the device has the function of collecting light reflected by human eyes at the fundus convergence facula for measuring diopter. The refractive eyepieces are not perpendicular to the optical axis but are deflected by an angle in the range of 3-10 degrees. The deflection angle can prevent the light emitted by the surface reflection refraction measurement light source of the lens from entering the refraction measurement camera and influencing the measurement precision.

The spectroscope can reflect 850nm near infrared light and transmit 950nm near infrared light and visible light. The optical element can selectively transmit or reflect light according to wave bands and is a common optical element of a plurality of optical paths. The function is that the light of the near-infrared wave band to which the refraction measuring light source belongs is reflected, and the light of the near-infrared wave band to which the curvature measuring light source belongs and the light of the visible wave band to which the fog visual target belongs are transmitted.

The refraction measurement optical path comprises a spectroscope, a refraction ocular lens, a mesopore reflector, an annular diaphragm 23, a conical lens 6, a refraction measurement objective lens 5 and a refraction measurement camera 4. The function of the device is to collect the light reflected by human eyes at the eyeground convergence facula, and form a light ring on the refraction measuring camera through the functions of the conical lens and the refraction measuring objective lens. And the diopter information of the tested human eyes is obtained by analyzing the halo form. The beam splitter, the dioptric eyepiece and the meso-porous mirror are common optical elements.

Wherein, annular diaphragm has a ring shape region can see through light, and this ring region internal diameter is 5mm, and the external diameter is 6 mm. Specifically, a circular ring-shaped area can transmit light, and other areas can block light. The position of the optical axis is optically conjugate with the cornea of the human eye (mutually in an object-image relationship). Thus, light emitted by the refraction measuring light source reflected by the central region of the cornea of the human eye can be intercepted. The interference of the light rays entering the refraction measuring camera to the refraction measurement is avoided, and the measurement precision is ensured.

Wherein, conical mirror is a conical mirror, and the included angle between the conical surface and the plane is 5 degrees. The function of the device is to further enlarge the light ring formed by the middle hole reflector, so that the final size of the light ring is matched with the photosensitive area of the refraction measuring camera. And further, enough pixels in the refraction measuring camera can be used for calculating the diopter, and the measuring precision is guaranteed.

Wherein, the refraction measurement objective lens is a double-cemented lens with a focal length of 25 mm. An image plane for ensuring a refraction measurement optical path is located on the refraction measurement camera.

The refraction measuring camera is a CMOS camera, the light sensing area is 1/2 inches, and the resolution is 120 ten thousand pixels.

The refractive measurement process comprises the following steps: the refraction measuring light source emits light rays, the light rays are converged by the condenser lens and pass through the small hole of the mesoporous reflector, and then the light rays are projected to the eye ground of human eyes by the refraction ocular lens to form a converged light spot. The light spot is reflected by the eye fundus of the human eye and then collected by the refraction ocular lens again, forms a light ring after being reflected by the mesoporous reflector, and is refracted by the conical lens and the refraction measurement objective lens to finally form a circular ring image in the refraction measurement camera. Through morphological analysis of the circular ring image, diopter information of human eyes can be obtained.

The fog light path comprises an optotype 18, a refraction compensation lens 17, a relay lens 16, a dichroic mirror 15, a curvature ocular lens 14 and a spectroscope. Wherein the dichroic mirror and the curvature eyepiece are shared with a curvature measurement optical path in the curvature measurement system. The beam splitter is shared with a plurality of optical paths.

The fog optical path has the function of guiding the human eye lens to relax during the refraction measurement, so that the influence of the human eye lens adjustment on the measurement result is eliminated, and the fog optical path is a mature technology and is not repeated.

The curvature measurement system comprises a curvature illumination module and a curvature measurement light path.

The curvature lighting module 11 is a lighting panel, and 32 LED light sources with a central wavelength of 950nm are provided thereon. The 32 LEDs are arranged in 2 concentric rings. When the two parts emit light simultaneously, 1 or more light rings can be formed on the cornea of the human eye. These rings are reflected by the cornea into the curvature measurement optical path and eventually form 1 or more concentric ring patterns in the curvature measurement camera. By morphological analysis of the circular ring pattern, the curvature information of the cornea of the human eye can be obtained.

The center wavelength of the LED light source is different from the center wavelength of the refraction measuring light source, so that the two measuring systems are prevented from interfering with each other. The number of the LEDs can be determined by the number of the formed circular rings, the number of the LEDs is at least 1 circle and 16, and 32 LEDs are selected in the embodiment.

The curvature lighting module is also provided with a focusing light source 10, and the focusing light source is 2 collimated LEDs with the wavelength of 950nm and can emit parallel light. The 2 collimated light sources are symmetrically distributed on the lighting module at an included angle of 30 degrees. Which can form two symmetrical in-focus light spots on the cornea of a human eye. By calculating the position of the focused light spot, the accurate position of the vertex of the cornea of the human eye in the Z direction can be obtained.

The curvature measurement optical path includes a spectroscope, a curvature eyepiece, a dichroic mirror, a curvature measurement objective lens 20, and a curvature measurement camera 19.

Wherein, the curvature ocular lens is a biconvex lens with a focal length range of 100 mm. The function of the device is to collect the light reflected by the cornea of the human eye and emitted by the curvature lighting module.

The dichroic mirror is capable of transmitting light rays in a visible light wave band and reflecting light rays in a near infrared wave band. Specifically, visible light rays emitted by the sighting mark in the fog light path can be transmitted, and near-infrared rays for curvature measurement are reflected.

Wherein, the curvature measuring objective lens is a low distortion lens group with a focal length of 75 mm. And the image plane used for ensuring the curvature measurement light path is positioned on the curvature measurement camera, and the size of the image is matched with the photosensitive area of the curvature measurement camera. And further, enough pixels in the curvature measuring camera can be used for calculating the curvature, and the measuring precision is guaranteed.

The curvature measuring camera is a CMOS camera, the light sensing area is 1/2 inches, and the resolution is 120 ten thousand pixels.

The curvature measurement process comprises the following steps: the curvature lighting module emits light rays which are projected on the cornea of human eyes to form 2 concentric light rings. The light ring is reflected by the cornea of the human eye, collected by the curvature ocular lens and imaged on the curvature measuring camera by the curvature measuring objective lens. By analyzing the form of the concentric circular ring pattern, the curvature information of human eyes can be obtained.

The automatic focusing system comprises two sets of same imaging modules. As shown in fig. 2, each set of imaging modules includes an imaging lens 9 and an imaging camera 8. The two sets of imaging modules are symmetrically distributed on two sides of the curvature lighting module at 45-degree included angles, and the intersection point of the optical axes is the vertex of the cornea.

The imaging lens is a lens group with a focal length of 8mm, an imaging field of view is 70 degrees, and an aperture F #4 is formed.

The imaging camera is a CMOS camera, with a photosensitive area of 1/4 inches and a resolution of 80 ten thousand pixels.

The automatic focusing system is a binocular stereo vision system, and can accurately position the positions of human eyes. The corneal vertex is difficult to identify, and the pupil has obvious characteristics under infrared illumination and is easy to identify. Therefore, the pupil is used as the target to locate, and the proper deviation is added to locate the vertex of the cornea of the human eye more accurately.

Due to assembly errors, the position calibration of the binocular camera in the auto-focus system is required. The checkerboard shown in fig. 3 is used as a calibration chart, and a plurality of checkerboard images with different angles and distances are collected. And inputting the image into a calibration algorithm to obtain internal reference and external reference data of the binocular system, wherein the parameters take the camera 1 as a reference coordinate.

The three-dimensional motion platform is an electric platform and can move along X, Y, Z three directions. This is a well-established technique and will not be described in detail. And the light path component is fixed at the upper end of the three-dimensional motion platform. Thus, the light path assembly can also move X, Y, Z in three directions and achieve alignment with the human eye.

Fig. 4 is a human eye image actually photographed by the automatic focusing system, and the pixel coordinates of the center of the pupil of the human eye can be calculated. And then, according to the calibration parameters, the three-dimensional positions of the pupils of the human eyes in the coordinate systems of the first imaging camera 21 and the second imaging camera 22 can be calculated. By comparing the deviation of the pupil position of the human eye from the preset position, the amount of shift of X, Y, Z can be obtained. And finally, the automatic alignment of human eyes can be realized by driving the three-dimensional motion platform.

Fig. 5 is a measurement flowchart of the present embodiment.

The three-dimensional motion platform was reset X, Y, Z to the tri-axial centered position prior to measurement.

After the measurement is started, firstly, the three-dimensional platform moves 30mm to the left, the automatic focusing system detects the left eye pupil, and the deviation of the current pupil position and the preset measurement position in three directions is calculated. And driving the three-dimensional motion platform according to the calculated deviation, so that the left eye pupil moves to a preset measurement position, and finishing X, Y, Z coarse alignment.

Next, the deviation of the center coordinates (current corneal vertex coordinates) of the concentric ring image obtained in the curvature measuring camera from the X, Y direction of the preset measurement position was calculated. And driving the three-dimensional motion platform according to the calculated deviation to finish X, Y direction fine alignment.

And thirdly, detecting a focused light spot in the curvature measuring camera, and calculating the Z-direction deviation of the current corneal vertex from the preset measuring position through the position of the focused light spot. And driving the three-dimensional motion platform according to the calculated deviation to finish the Z-direction precise alignment. If the detection fails, the Z-direction deviation is over large, and the automatic focusing system is called again to carry out alignment at the moment. After alignment, the curvature measuring camera collects images to measure the corneal curvature. After the refraction measurement is finished, starting a refraction measurement light source and a refraction measurement camera to perform refraction measurement;

finally, after the measurement of the left eye is completed, the refraction measuring light source and the refraction measuring camera are turned off. Meanwhile, the three-dimensional motion platform automatically moves rightwards to a position which is 30mm away from the right side of the center, and the right eye is automatically measured; and after the binocular measurement is finished, the three-dimensional platform automatically resets to wait for the next measurement.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims

1. The full-automatic human eye visual inspection device consists of an optical path component and a three-dimensional motion platform, wherein the optical path component is fixed at the upper end of the three-dimensional motion platform, and the alignment with eyes (12) is completed through the motion of the three-dimensional motion platform in X, Y, Z three directions, and the full-automatic human eye visual inspection device is characterized in that: the light path component consists of a refraction measuring system, a curvature measuring system and an automatic focusing system, wherein the refraction measuring system is used for measuring the diopter of human eyes; the curvature measuring system is used for measuring the curvature of the cornea of the human eye; the automatic focusing system is used for positioning human eyes; the refraction measuring system consists of a projection light path, a refraction measuring light path and a fog light path,

the projection light path is composed of a refraction measurement light source (1), a condenser lens (2), a mesopore reflector (3), a refraction ocular lens (7) and a spectroscope (13), the condenser lens (2) is arranged in front of the refraction measurement light source (1), the condenser lens (2) projects collected light rays onto the mesopore reflector (3) in front of the condenser lens, and the mesopore reflector (3) sequentially projects the light rays onto the eye ground through the refraction ocular lens (7) and the spectroscope (13) arranged in front of the mesopore reflector to form a converged light spot;

the refraction measurement optical path is composed of a spectroscope (13), a refraction ocular lens (7), a middle hole reflector (3), an annular diaphragm (23), a conical lens (6), a refraction measurement objective lens (5) and a refraction measurement camera (4), the spectroscope (13) reflects light spots converged by the eyeground to the refraction ocular lens (7) at the rear part of the spectroscope, the refraction ocular lens (7) sequentially forms a light ring on the refraction measurement camera (4) through the middle hole reflector (3), the annular diaphragm (23), the conical lens (6) and the refraction measurement objective lens (5), and the refraction information of the eye to be measured is obtained through analysis of the light ring form;

the fog light path is used for guiding human eye crystals to relax during refraction measurement, so that the influence of human eye crystal adjustment on a measurement result is eliminated, and the fog light path is composed of a sighting target (18), a refraction compensation lens (17), a relay lens (16), a dichroic mirror (15), a curvature ocular lens (14) and a spectroscope (13).

2. A fully automated human eye vision inspection apparatus according to claim 1, wherein: the refraction measurement light source (1) is a near-infrared band incoherent light source, and the central wavelength range is 700 nm-1100 nm;

the condenser lens (2) is an optical lens and is used for collecting and converging light rays emitted by the refraction measuring light source (1), and the focal length range of the condenser lens is 10-50 mm;

the middle hole reflector (3) is a plane reflector with a hole in the center, the diameter range of the small hole in the center is 0.5-2.5mm, and when the middle hole reflector is used for projecting a light path, the middle hole reflector is used for projecting light rays emitted by the refraction measuring light source (1) to the fundus to form light spots; when used in a refraction measurement optical path, the function of the optical path is to reflect light reflected from the fundus into the refraction measurement camera (4);

the refraction ocular lens (7) is an optical lens, and the focal length range is 30-100 mm; when the device is used for projecting the light path, the device has the function of projecting the light rays emitted by the curvature measuring light source on the fundus to form a convergent light spot; when the device is used for a curvature measuring light path, the device has the function of collecting light reflected by human eyes at the fundus convergence facula and is used for measuring diopter;

the spectroscope (13) is an optical transreflector, can selectively transmit or reflect light according to wave bands, is a common optical element of a plurality of light paths, and has the function of reflecting the light of the near infrared wave band to which the refraction measurement light source (1) belongs, and transmitting the light of the near infrared wave band to which the curvature measurement light source belongs and the light of the visible light wave band to which the fog visual target belongs.

3. A fully automated human eye vision inspection apparatus according to claim 1, wherein: the dioptric ocular lens (7) is arranged on an optical axis in a deflection mode, and the deflection angle is 3-10 degrees.

4. A fully automated human eye vision inspection apparatus according to claim 1, wherein: the annular diaphragm (23) is an optical element, an annular area on the annular diaphragm can transmit light, other areas can block light, and the position of the annular diaphragm on the optical axis is optically conjugated with the cornea of the human eye;

the conical lens (6) is an optical lens, the surface of the conical lens is a conical surface, and the included angle between the conical surface and the plane is 3-10 degrees;

the refraction measurement objective lens (5) is an optical lens and is used for ensuring that an image plane of a refraction measurement optical path is positioned on the refraction measurement camera (4);

the refraction measurement camera (4) is a CCD or CMOS camera, the light sensing area is not more than 1 inch, the resolution is not less than 30 ten thousand pixels, and the refraction measurement camera is positioned on the image plane of the refraction measurement light path to form an image for later analysis.

5. A fully automated human eye vision inspection apparatus according to claim 1, wherein: the curvature measuring system consists of a curvature lighting module (11) and a curvature measuring optical path,

the curvature lighting module (11) is composed of a lighting lamp panel, a near-infrared band LED light source and two focusing light sources (10), one or more concentric rings are arranged on the lighting lamp panel, the concentric rings are composed of a plurality of LED light sources of near-infrared bands which are uniformly distributed at intervals, the two focusing light sources (10) are symmetrically arranged on two sides of the lighting lamp panel, and the included angle between each focusing light source (10) and the lighting lamp panel is 20-70 degrees;

the curvature measuring light path is composed of a spectroscope (13), a curvature ocular lens, a dichroic mirror, a curvature measuring objective lens (20) and a curvature measuring camera (19), the spectroscope (13) is arranged behind the curvature lighting module (11), light rays of a near infrared band reflected by a cornea of a human eye are transmitted through the spectroscope (13) and collected on the curvature ocular lens, the light rays are reflected to the curvature measuring objective lens (20) through the dichroic mirror, the curvature measuring objective lens (20) is used for ensuring that an image plane of the curvature measuring light path is located on the curvature measuring camera (19), and the image size is matched with the photosensitive area of the curvature measuring camera (19).

6. A fully automated human eye vision inspection apparatus according to claim 5, further comprising: the central wavelength of the near-infrared band LED light source is 700 nm-1100 nm;

the focusing light source (10) is a near-infrared band collimation light source, and the central wavelength of the focusing light source is the same as or similar to that of a near-infrared band LED light source;

the curvature measurement objective lens (20) is an optical lens and is used for ensuring that an image plane of a curvature measurement optical path is positioned on the curvature measurement camera (19) and enabling the size of an image to be matched with the light sensing area of the curvature measurement camera (19);

the curvature measuring camera (19) is a CCD or CMOS camera, the photosensitive area is not more than 1 inch, the resolution is not less than 30 ten thousand pixels, and the curvature measuring camera is positioned on the image plane of the curvature measuring light path to form an image for later analysis.

7. A fully automated human eye vision inspection apparatus according to claim 5, further comprising: the automatic focusing system is composed of two groups of imaging modules which are symmetrically distributed on two sides of the curvature lighting module (11) at a certain included angle, and the included angle range is 20-70 degrees; the imaging module is composed of an imaging lens (9) and an imaging camera (8) positioned at the rear part of the imaging lens.

8. A fully automated human eye vision inspection apparatus according to claim 7, wherein: the imaging lens is one or a group of optical lenses, the focal length of the imaging lens is not more than 50mm, the imaging field of view is not less than 50 degrees, and the aperture is not less than F # 12;

9. A full-automatic human eye visual inspection method is characterized in that: the method comprises the following steps:

driving the three-dimensional motion platform according to the deviation calculated in the second step to enable the left eye pupil to move to a preset measurement position, and finishing X, Y, Z coarse alignment; at the moment, a clearer concentric ring image can be obtained in the curvature measuring camera (19), and the deviation between the central coordinate of the concentric ring and the X, Y direction of the preset measuring position is calculated;

driving the three-dimensional motion platform according to the deviation calculated in the step three to finish X, Y direction fine alignment; at the moment, a focusing light spot can be detected in the curvature measuring camera (19), and the Z-direction deviation of the current corneal vertex and a preset measuring position can be calculated through the position of the focusing light spot; if the detection fails, the Z-direction deviation is over large, and at the moment, the automatic focusing system is called again for alignment;

step five, driving the three-dimensional motion platform according to the deviation calculated in the step four to finish the Z-direction precise alignment; after alignment, a curvature measurement camera (19) collects images to measure the corneal curvature; after the measurement is finished, the refraction measurement light source (1) and the refraction measurement camera (4) are turned on to perform refraction measurement;

step six, after the refraction measurement is finished, the refraction measurement light source (1) and the refraction measurement camera (4) are closed; meanwhile, the three-dimensional motion platform automatically moves rightwards to a position which is 30mm away from the right side of the center, and the right eye is automatically measured;