CN114587268A

Movatterモバイル変換

Info

Publication number: CN114587268A
Application number: CN202210358199.XA
Authority: CN
Inventors: 田苗; 贾晓轩
Original assignee: Shanghai Guanai Medical Technology Co ltd
Current assignee: Shanghai Guanai Medical Technology Co ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-06-07

Abstract

The invention provides a full-automatic optometry topographic map, which comprises an imaging system and a control processing system, wherein the imaging system comprises an imaging component, an illuminating device and a shooting device, a projection objective is arranged on the light emergent side of the illuminating device, a digital micro-mirror device or a transmission type calibration plate with projection patterns is arranged on the light emergent side of the projection objective, and the projection patterns are used for assisting in qualitatively and quantitatively analyzing the refraction degree of human eyes; the control processing system comprises a data processing module for receiving the fundus image and calculating to generate a topographic map and an output display module for displaying the topographic map. The invention also provides an optometry method applying the full-automatic optometry topographic map instrument. The full-automatic optometry topographic map instrument and the optometry method provided by the invention have the advantages that the equipment structure is simple, the cost is low, the detection parameters are complete, the ametropia condition of human eyes is obtained through the change of the characteristics of the projection pattern, and the optometry topographic map can be obtained through image processing.

Description

Full-automatic optometry topographic map instrument and optometry method

Technical Field

The invention relates to a topographer and an optometry method, in particular to a full-automatic optometry topographer for ophthalmologic detection and an optometry method.

Background

The refraction of human eyes usually needs to detect the ametropia such as myopia, hyperopia and astigmatism, and is the most common means in clinical ophthalmology clinics. According to the statistics of the world health organization, China has become the world with the most people suffering from ametropia. Ametropia affects not only the visual health of individuals, but also the culture of a large number of professional talents such as national soldier admission, pilot culture, navigation, fire fighting, criminal investigation and the like, so that the detection evaluation and the effective prevention and control of ametropia are very important.

In the detection evaluation of ametropia, the diopter of the central visual field is one of the most important parameters for the vision evaluation of the human eye. Most of the existing vision measuring devices mainly measure the central visual field refraction of human eyes. Studies have shown that diopters of the peripheral field of vision contribute to the trend of vision. However, there is no clear research conclusion at present regarding how large the diopter of the peripheral visual field is and what the influence on the visual acuity is. This is because there is no optometric means available in existing commercial optometric products to enable reliable, high-density, continuous measurement of the retinal peripheral refractive state. In the prior art (CN202011088042.7), the dioptric topographer mainly detects different defocus positions when light with different wavelengths is converged on the retina, and simulates and calculates the dioptric topography of the retina by defocus compensation. However, such a refractive topographer must use a multispectral light source, which results in a high cost and complex construction.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a full-automatic optometry topographer and an optometry method, and solves the problems of few detection parameters, high cost and complex structure of the existing optometry equipment.

In order to solve the technical problems, the invention provides the following technical scheme:

a full-automatic optometry topographic map instrument comprises an imaging system and a control processing system, wherein the imaging system comprises an imaging assembly, an illuminating device and a shooting device, a projection objective is arranged on the light emitting side of the illuminating device, a digital micro-mirror device or a transmission type calibration plate with a projection pattern is arranged on the light emitting side of the projection objective, the projection pattern is used for assisting in qualitatively and quantitatively analyzing the refraction degree of human eyes, and the projection pattern has the characteristics of clear outline, sharp edge line, arrangement rule and convenience in calculating and analyzing pattern change; the control processing system comprises a data processing module for receiving the fundus image and calculating to generate a topographic map and an output display module for displaying the topographic map.

Further, the formation of image subassembly is including the omentum objective that is used for the first time formation of image, the group of the commentaries on classics image mirror that is used for the second time formation of image and the collimation mirror that is used for the formation of image for the third time group, shooting device is used for shooing the formation of image for the third time, be provided with first polaroid between omentum objective and the group of the commentaries on classics image mirror, the light path of first polaroid with the light path of projection objective is parallel and relatively independent.

Furthermore, the control processing system is connected with a driving device, and the driving device can control the image rotating mirror group or the collimating mirror group to move so as to adjust the relative positions of the image rotating mirror group and the collimating mirror group.

Further, the driving device is a stepping motor, and the stepping motor is connected with the collimating lens group.

Further, the lighting device comprises a light source and a driver, wherein the driver is used for adjusting the light emitting brightness of the light source, and a second polaroid is arranged between the light source and the projection objective.

Further, the control processing system is connected with the driver through a driving circuit.

Further, the projection pattern is a black and white checkerboard pattern.

Furthermore, the material of the transmission type calibration plate is glass or plastic.

An optometry method applying the full-automatic optometry topographic map instrument comprises the following steps:

s1, controlling the driver by the control processing system through the driving circuit to keep the light source at a low brightness and at a normal brightness, and projecting the projection pattern onto the retina of the human eye through the second polarizer and the projection objective;

s2, adjusting the relative position of the image transfer lens group and the collimating lens group by the control processing system to focus the definition of the eyeground image, after focusing, starting exposure, simultaneously and rapidly increasing the brightness of the light source to obtain a clear eyeground image with a projection pattern, then storing the image and reducing the brightness of the light source to a lower brightness state to protect human eyes;

s3, the data processing module calculates the change condition of the projection pattern in the obtained fundus image by taking the fundus picture with the projection pattern which is normal to refract as reference, thereby obtaining the corresponding ametropia condition of human eyes, further obtaining the optometry parameters and generating an optometry topographic map.

Further, in step S2, one fundus image is taken focusing on the position where the center image of the projected pattern is most clear, and then the stepping motor is controlled by the control processing system to move in the front and rear two directions, which correspond to the near-vision defocus and the far-vision defocus respectively, and take several fundus images in the two directions, respectively.

The invention relates to a full-automatic optometry topographic map and an optometry method, which have the advantages of simple equipment structure, low cost and complete detection parameters, and can obtain an optometry topographic map by changing the characteristics of a projection pattern and processing the image according to the principle that the detailed characteristics of the image imaged by an eyeground imaging module can be changed to different degrees after the projection pattern is reflected by retina due to different refraction of human eyes.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of an optical path structure of a fully-automatic optometry topographic apparatus in use;

FIG. 2 is a schematic diagram of a black and white checkerboard pattern;

FIG. 3 is a schematic diagram of an alternative projection pattern;

FIG. 4 is a schematic flow diagram of an optometry method;

fig. 5 is a schematic view of a fundus image in which a projection pattern is fused in an optometry method.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

A full-automatic optometry topographic map instrument comprises an imaging system and a control processing system, wherein the imaging system comprises an imaging assembly, a lighting device and a shooting device, aprojection objective 1 is arranged on the light-emitting side of the lighting device, a transmissiontype calibration plate 2 with a projection pattern is arranged on the light-emitting side of theprojection objective 1, the projection pattern is used for assisting in qualitatively and quantitatively analyzing the refraction degree of human eyes, and the projection pattern has the characteristics of clear outline, sharp edge lines, regular arrangement and convenience in calculating and analyzing pattern change; the control processing system comprises adata processing module 3 for receiving the fundus image and computationally generating a topographic map and anoutput display module 4 for displaying the topographic map.

The transmissive calibration plate with the projected pattern can be replaced with digital micromirror devices each containing millions of individually controlled micromirrors (built on corresponding CMOS memory cells). During operation, the controller of the digital micromirror device loads each elementary memory cell with a "1" or a "0", followed by the application of a mirror reset pulse, which causes each micromirror to electrostatically deflect by about an angle, thereby achieving the corresponding +/-12 ° state. The angle of departure of these two active states is repeatable, as it is physically stopped by the resistance of the two pogo pins. In a projection system, the +12 ° state corresponds to an "on" pixel and the-12 ° state corresponds to an "off" pixel. The projected pattern is created by programming the on/off duty cycle of each lens. The process of generating the projected pattern by the digital micromirror device can be implemented by controlling a controller of the digital micromirror device by a control processing system.

The imaging system is a high-resolution fundus camera optical system, and the optical system meets the requirement of performing clear imaging on retina of a human eye in a large view field range. The imaging assembly comprises a meshobjective lens 5 forprimary imaging 105, an imagetransfer lens group 6 forsecondary imaging 106 and acollimating lens group 7 for third imaging, the shooting device is used for shooting third imaging, afirst polaroid 8 is arranged between the meshobjective lens 5 and the imagetransfer lens group 6, and the light path of thefirst polaroid 8 is parallel to and relatively independent of the light path of the projectionobjective lens 1.

Fig. 1 is a schematic diagram of an optical path structure when the present invention is used, wherein 101 is a human eye, 102 is a retina, 103 is an eyeball, and 104 is a pupil. The specific light path principle is as follows: the light source emits monochromatic light which sequentially passes through the first polaroid, the projection objective, the transmission type calibration plate with projection patterns, the retina objective, the pupil and the eyeball to reach the retina; the light is subjected to diffuse reflection on the retina, and the reflected light sequentially passes through the eyeball, the pupil and the retina objective lens to form a first image; the light enters the image rotating mirror group after passing through the second polaroid to form a second image; and forming a third image after passing through a collimating lens group.

The control processing system is connected with a driving device which is a stepping motor, the stepping motor is connected with thecollimating lens group 7, and thecollimating lens group 7 can be controlled to move so as to adjust the relative positions of therelay lens group 6 and thecollimating lens group 7, thereby completing defocusing compensation.

The illumination device comprises alight source 9 and a driver for adjusting the brightness of the light emitted by thelight source 9, and asecond polarizer 10 is arranged between thelight source 9 and theprojection objective 1. The light source is used as the illumination light source of the eyeground and the illumination light source of the projection objective at the same time, the light source adopts the full-system apochromatism illumination technology with a reflector improved on the basis of the Kohler illumination system, the illumination chromatic aberration can be eliminated, the reducibility of light is enhanced, the resolution ratio is further improved, the illumination is uniform, the light effect is high, the projection pattern can be uniformly and fully bright, and the high-resolution projection of the projection pattern is ensured without generating glare.

The control processing system is connected with the driver through the driving circuit, so that the brightness of the light source is automatically adjusted.

The projection pattern is a black and white checkerboard pattern, as shown in fig. 2, the projection pattern is composed of small black and white squares of n × n, the side length of each small black and white square is C/n (mm), and C is the diameter of retina of human eye. The projected pattern may also be a circle such as a concentric circle, diamond grid, a combination of ordered patterns, black and white spaced sectors, as shown in fig. 3.

The material of thetransmission calibration plate 2 is glass or plastic.

Thedata processing module 3 adopts a high-performance microcomputer data processing center and is used for finishing various data processing including feedback data required by a control processing system, optometry parameters required by an output display module and the like.

As shown in fig. 4, an optometry method using the fully automatic optometry topographer comprises the following steps:

s2, adjusting the relative positions of the image transfer lens group and the collimating lens group by the control processing system to focus the definition of the eyeground image, after the focusing is finished, starting exposure, and simultaneously rapidly increasing the brightness of the light source to obtain a clear eyeground image A (shown in figure 5) with a projection pattern, focusing to shoot an eyeground image A at the position which enables the central imaging of the projection pattern to be clearest, then controlling the stepping motor to move in the front and back two directions by the control processing system, shooting an eyeground image A by the motor at each angle, wherein the front and back two directions respectively correspond to near-out focusing and far-out focusing, shooting 10 eyeground images A in the two directions respectively, storing the images and reducing the brightness of the light source to a low brightness state to protect human eyes;

and S3, the data processing module calculates the change condition of the projection pattern in the obtained fundus image A by taking the fundus picture with the projection pattern in the emmetropia as a reference so as to obtain the corresponding ametropia condition of human eyes, further obtain the optometry parameters and generate an optometry topographic map.

Due to the existence of defocus, the detail characteristics of the projection pattern on each fundus image generate variation corresponding to the defocus condition, the size and the direction of defocus can be obtained by analyzing and calculating the variation through an image processing algorithm, and the optometry parameters and the optometry topographic map of human eyes can be more accurately obtained.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a full-automatic optometry topographic map appearance which characterized in that: comprises an imaging system and a control processing system,

the imaging system comprises an imaging component, an illuminating device and a shooting device, wherein a projection objective is arranged on the light emitting side of the illuminating device, a digital micro-mirror device or a transmission type calibration plate with a projection pattern is arranged on the light emitting side of the projection objective, the projection pattern is used for assisting in qualitatively and quantitatively analyzing the refraction degree of human eyes, and the projection pattern has the characteristics of clear outline, sharp ridge line, arrangement rule and convenience in calculating and analyzing pattern change;

the control processing system comprises a data processing module for receiving the fundus image and calculating to generate a topographic map and an output display module for displaying the topographic map.

2. The fully automatic optometric topographer of claim 1, wherein: the imaging assembly comprises a mesh film objective lens for imaging for the first time, a relay lens group for imaging for the second time and a collimating lens group for imaging for the third time, the shooting device is used for shooting the imaging for the third time, a first polaroid is arranged between the mesh film objective lens and the relay lens group, and the light path of the first polaroid is parallel to the light path of the projection objective lens and is relatively independent.

3. A fully automatic optometric topographer according to claim 2 wherein: the control processing system is connected with a driving device, and the driving device can control the image rotating mirror group or the collimating mirror group to move so as to adjust the relative positions of the image rotating mirror group and the collimating mirror group.

4. A full-automatic optometry topographer according to claim 3, wherein: the driving device is a stepping motor, and the stepping motor is connected with the collimating lens group.

5. The fully automatic optometric topographer of claim 1, wherein: the lighting device comprises a light source and a driver, wherein the driver is used for adjusting the light-emitting brightness of the light source, and a second polaroid is arranged between the light source and the projection objective.

6. The fully automatic optometric topographer of claim 5, wherein: the control processing system is connected with the driver through a driving circuit.

7. The fully automatic optometric topographer of claim 1, wherein: the projection pattern is a black and white checkerboard pattern.

8. The fully automatic optometric topographer of claim 1, wherein: the transmission type calibration plate is made of glass or plastic.

9. An optometry method using a fully automated optometry topographer according to claim 4, comprising the steps of:

and S3, the data processing module calculates the change condition of the projection pattern in the obtained fundus image by taking the fundus picture with the projection pattern in the emmetropia as a reference so as to obtain the corresponding ametropia condition of human eyes and further obtain the optometry parameters and generate an optometry topographic map.

10. The optometric method of claim 9, wherein: in step S2, a single fundus image is taken focusing on the position where the center image of the projected pattern is most clear, and then the stepping motor is controlled by the control processing system to move in the front and rear directions, which correspond to the near defocus and the far defocus respectively, and take a plurality of fundus images in the two directions, each at an angle of rotation of the motor.