CN215584104U

CN215584104U - Subjective and objective integrated precise optometry device with stray light eliminating mechanism

Info

Publication number: CN215584104U
Application number: CN202120560751.4U
Authority: CN
Inventors: 何良义
Original assignee: Changxing Aizhitong Medical Technology Co ltd
Current assignee: Zhejiang Aizhitong Medical Technology Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2022-01-21
Anticipated expiration: 2031-03-18

Abstract

The utility model discloses an objective and subjective integrated precise optometry device with a parasitic light elimination mechanism, which comprises an infrared beacon light source, a collimating objective, a reflector, a second spectroscope, a first relay telescope, a second relay telescope and a wavefront sensor, wherein all components are combined to form the precise optometry device, and the device is characterized in that: an annular diaphragm and a polarizing plate are arranged on the light path of the infrared beacon light source and the collimating objective lens, the annular diaphragm and the polarizing plate are sequentially arranged between the collimating objective lens and the second beam splitter, and the analyzer plate is arranged between the second relay telescope and the first beam splitter; the second relay telescope is provided with a small aperture diaphragm; the device can eliminate the influence of various stray lights on the refractive error of human eyes measured by the wavefront sensor.

Description

Subjective and objective integrated precise optometry device with stray light eliminating mechanism

Technical Field

The utility model relates to the field of ophthalmic medical equipment, in particular to an objective and subjective integrated precise optometry device with a parasitic light eliminating mechanism.

Background

Uncorrected refractive errors (including myopia, hyperopia and astigmatism), and non-surgically treated cataracts are the two leading causes of vision impairment (see literature [ J ]. Ophthematology 2016; 123 (5): 1036) 1042. The critical point in performing refractive correction for a patient is the accurate refraction of the human eye for the degree of refractive error to give the best corrective prescription.

Currently, the optometry procedure includes two steps of objective optometry and subjective optometry. Methods for objective refraction include shadowgraph and optometry and objective measurement of refractive errors of patients by means of professional equipment such as computer optometry, eye aberrometers and the like. On the basis, the subjective refraction is carried out by utilizing the trial frame insert or the comprehensive refractometer. Since objective refraction does not involve subjective feedback from the subject, the test results are often used as reference. The accuracy and repeatability of subjective refraction depends on the degree of fitting of the examinee, the level of the examinee and clinical experience to a great extent, so that the quality of the corrective prescription obtained based on the existing subjective refraction method is uneven. More importantly, the prior trial frame insert or the prior comprehensive optometry instrument adopts trial lenses with discrete degrees (step length of 0.25D) to carry out subjective optometry, has adjustment errors and cannot realize continuous and accurate optometry on the ametropia of human eyes.

Aiming at the problems that the subjective and objective separation (different devices are adopted) of the existing optometry means, the subjective and objective artificial factors have large influence and the test lens degree is discontinuous and has the rounding error, the subjective and objective integrated precise optometry device is provided in the patent 201910777661.8, and the binocular subjective and objective integrated precise optometry can be realized. The optometry device adopts a Hartmann wavefront measurement technology to realize the measurement of the human eye ametropia. In actual operation, when the beacon light enters the human eye through the relay optical system and the cornea of the human eye, stray light reflected by the optical lens and the surface of the cornea of the human eye enters the wavefront sensor, which seriously affects the measurement result of the refractive error of the human eye and even cannot be measured. Meanwhile, the retina of the human eye is composed of a multilayer structure, and reflected light of different layers of the retina can enter the wavefront sensor to influence the measurement result of the refractive error of the human eye. In addition, ambient illumination light can also affect the proper operation of the wavefront sensor. In order to eliminate the influence of ambient illumination light, the common method is used in a darkroom, and the defect of the method is that the debugging is inconvenient and the indoor illumination light needs to be switched back and forth.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an objective and subjective integrated precise optometry device with a parasitic light elimination mechanism aiming at the defects, and solves the problems that various stray light influences a wavefront sensor to measure the refractive error of human eyes and the prior art is inconvenient to debug in the prior art.

The scheme is realized as follows:

the utility model provides an accurate optometry device of subjective and objective integral type with stray light mechanism disappears, includes infrared beacon light source, collimating objective, speculum, second spectroscope, first relay telescope, second relay telescope and wavefront sensor, and each subassembly combination forms accurate optometry device, its characterized in that: an annular diaphragm and a polarizing plate are arranged on the light path of the infrared beacon light source and the collimating objective lens, the annular diaphragm and the polarizing plate are sequentially arranged between the collimating objective lens and the second beam splitter, and the analyzer plate is arranged between the second relay telescope and the first beam splitter; and the second relay telescope is provided with a small aperture diaphragm.

Based on the subjective and objective integrated precise optometry device with the stray light eliminating mechanism, the front end of the wavefront sensor is provided with the band-pass filter with the central wavelength consistent with or close to the beacon wavelength.

Based on the subjective and objective integrated precise optometry device with the stray light eliminating mechanism, the deflection direction of the analyzer plate is orthogonal to the polarization direction of the polarizer plate.

Based on the above-mentioned accurate optometry device of subjective and objective integral type with stray light mechanism that disappears, second relay telescope includes 2 lenses, the aperture diaphragm sets up in the public focus department that is located two lenses.

Based on the accurate optometry device of subjective and objective integral type with stray light mechanism that disappears of the aforesaid, annular diaphragm and polarizer structure as an organic whole, the structure as an organic whole is made with arbitrary lens in the second relay telescope to analyzer plate, and band pass filter becomes an organic whole structure with wavefront sensor's microlens array.

Based on the above subjective and objective integrated accurate optometry device with the stray light eliminating mechanism, the annular diaphragm is connected with the rotating mechanism, and the annular diaphragm is rapidly rotated through the rotating mechanism to shield an optical path.

Based on the subjective and objective integrated precise optometry device with the stray light eliminating mechanism, the annular diaphragm comprises an outer shading ring, a central shading plate and a connecting part; the central shading plate is connected with the outer shading ring through a connecting part, a gap is arranged between the outer shading ring and the central shading plate, and the gap is a light transmission part.

Based on the subjective and objective integrated precise optometry device with the stray light eliminating mechanism, the optometry device also comprises an eye refraction correction subsystem, an eyeball positioning subsystem and a viewing function testing subsystem; the human eye refraction correction subsystem comprises a first relay telescope and a cylindrical mirror pair, the eyeball positioning subsystem comprises a pupil imaging device, and the subjective visual function test subsystem comprises a visual target display device and a visual target objective lens; the human eye refractive objective measurement subsystem and the human eye refractive correction subsystem share a first relay telescope.

Based on the subjective and objective integrated precise optometry device with the stray light eliminating mechanism, the cylindrical lens pair is arranged between the first relay telescope and the first spectroscope, the cylindrical lens pair is coaxial with the optical path of the first relay telescope, the original optical path of the first spectroscope is coaxial with the optical path of the second relay telescope, the light splitting path of the first spectroscope is coaxial with the original optical path of the second spectroscope, the light splitting path of the second spectroscope is coaxial with the optical path of the collimating objective, the near-infrared beacon light source is arranged at the rear position of the collimating objective, and the wavefront sensor is arranged at the rear position of the second relay telescope; the cylindrical mirror pair is arranged on an optical loop between the first relay telescope and the first spectroscope, the steering angle of a single cylindrical mirror in the cylindrical mirror pair is adjusted, continuous correction on astigmatism of eyes is achieved, the distance of a lens in the first relay telescope is adjusted, and continuous correction on defocusing is achieved; the reflector is arranged in parallel with the second spectroscope, the sighting target objective lens is arranged in the direction of emergent rays of the reflector, and the sighting target display device is arranged at the rear side position of the sighting target objective lens; the first relay telescope comprises convex lenses arranged in parallel, and the optical paths of the two convex lenses are coaxial.

Compared with the prior art, the utility model has the beneficial effects that:

1. the optical diaphragm with the center shielding is adopted in the scheme, enters human eyes after passing through the polarizing plate and the optical system, the analyzer is arranged in front of the wavefront sensor, and the polarization direction is orthogonal to the polarization direction of the polarizing plate so as to eliminate the influence of backward reflected light of the vertex of the surface of the lens and the vertex of the cornea of the human eyes on the wavefront sensor. Meanwhile, a small aperture diaphragm with a proper aperture is added at the common focus of the relay telescope to filter out stray light caused by other layers of retina, cornea and lens surface. A band-pass filter is added at the front end of the wavefront sensor to eliminate the influence of ambient illumination light on the wavefront sensor; the influence of various stray lights on the refractive error of the human eyes measured by the wavefront sensor is eliminated.

Drawings

FIG. 1 is a schematic diagram of an optical path of an objective and subjective integrated precision optometry apparatus in the prior art;

FIG. 2 is a schematic structural diagram of an objective and subjective integrated precision optometry device with a parasitic light eliminating mechanism according to the present invention;

in the figure: 1. the human eye; 2. a pupil imaging device; 3. a first relay telescope; 4. through the cylindrical mirror pair; 5. a first beam splitter; 6. a second relay telescope; 7. a wavefront sensor; 8. a visual target display device; 9. a near-infrared beacon light source; 10. a collimating objective lens; 11. a sighting target objective lens; 12. a mirror; 13. a second spectroscope; 14. an annular diaphragm; 15. a polarizing plate; 16. a polarization analyzing sheet; 17. and (4) a small aperture diaphragm.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example 1

Referring to fig. 2, the present invention provides a technical solution:

an objective and subjective integrated precise optometry device with a parasitic light eliminating mechanism; the device comprises an infrared beacon light source 9, a collimating objective lens 10, a reflector 12, a second spectroscope 13, a first spectroscope 5, a first relay telescope 3, a second relay telescope 6 and a wavefront sensor 7, wherein all components are combined to form the accurate optometry device, and the structure and the connection mode are the prior art; an annular diaphragm 14 and a polarizing plate 15 are arranged on the light path of the infrared beacon light source 9 and the collimating objective lens, the annular diaphragm 14 and the polarizing plate 15 are sequentially arranged between the collimating objective lens and the second beam splitter, and the analyzer 16 is arranged between the second relay telescope and the first beam splitter; the second relay telescope is provided with a small aperture diaphragm 17; and a band-pass filter with the central wavelength consistent with or close to the beacon wavelength is arranged at the front end of the wavefront sensor.

Based on the structure, an annular diaphragm 14 with a central shield and a polarizing plate 15 are added in a beacon light path, an analyzer plate 16 is arranged in front of the wavefront sensor, and the polarization direction is orthogonal to the polarization direction of the polarizing plate 15, so that the influence of backward reflection light of the vertex of the lens surface and the vertex of the human eye cornea on the wavefront sensor 7 is eliminated.

The light coming back from the fundus is changed into partial polarized light or natural light after being scattered for multiple times, wherein the light with the polarization direction consistent with that of the analyzer plate 16 can penetrate through the analyzer plate 16 to enter the wavefront sensor 7, and the measurement of the human eye refractive error is realized.

An aperture stop 17 is added to the second relay telescope 6, and only the beacon light scattered from a specific layer of the fundus retina can pass through the aperture stop, so that stray light caused by other layers, the cornea and the lens surface can be eliminated. In addition, a band-pass filter with the central wavelength consistent with or close to the beacon wavelength is added at the front end of the wavefront sensor, so that the influence of ambient illumination light on the wavefront sensor is eliminated, and the device can normally work under the illumination condition.

The second relay telescope comprises 2 lenses and the aperture stop 17 is arranged at the common focus of the two lenses.

In other embodiments, the ring diaphragm 14 and the polarizer 15 are integrated to facilitate the adjustment of the whole device.

In other embodiments, the analyzer plate 16 and any lenses in the second relay telescope 6 are integrated to facilitate adjustment of the overall device.

In other embodiments, the bandpass filter is integral with the microlens array of the wavefront sensor.

In other embodiments, the annular diaphragm 14 is connected to a rotating mechanism, and the rotating mechanism rapidly rotates the annular diaphragm 14 to block the optical path.

Since there is no annular diaphragm 14 with a completely independent center, the annular diaphragm 14 with an independent center is obtained by approximation through high-speed rotation; the annular diaphragm 14 includes an outer shading ring, a central shading plate and a connecting portion; the central shading plate is connected with the outer shading ring through a connecting part, a gap is arranged between the outer shading ring and the central shading plate, and the gap is a light transmission part; when the annular diaphragm 14 rotates at a high speed, the gap forms an annular light-transmitting part approximately, and the central light shielding plate forms an independent structure approximately to shield the central flare passing through the gap.

The scheme supplements the integral optometry device, and also comprises an eye refraction correction subsystem and an eyeball positioning subsystem; the human eye refraction correction subsystem comprises a first relay telescope 3 and a cylindrical mirror pair 4, the eyeball positioning subsystem comprises a pupil imaging device 2, and the subjective visual function test subsystem comprises a visual target display device 8 and a visual target objective lens 11. The human eye refractive objective measurement subsystem and the human eye refractive correction subsystem share a first relay telescope 3;

the cylindrical mirror pair 4 is arranged between the first relay telescope 3 and the first spectroscope 5, the cylindrical mirror pair 4 is coaxial with an optical path of the first relay telescope 3, a primary optical path of the first spectroscope 5 is coaxial with an optical path of the second relay telescope 6, a light splitting path of the first spectroscope 5 is coaxial with a primary optical path of the second spectroscope 13, a light splitting path of the second spectroscope 13 is coaxial with an optical path of the collimator objective lens 10, the near-infrared beacon light source 9 is arranged at the rear side position of the collimator objective lens 10, and the wavefront sensor 7 is arranged at the rear side position of the second relay telescope 6.

The cylindrical mirror pair 4 is arranged on an optical loop between the first relay telescope 3 and the first spectroscope 5, the steering angle of a single cylindrical mirror in the cylindrical mirror pair 4 is adjusted, continuous correction of astigmatism of human eyes 1 is achieved, the distance of a lens in the first relay telescope 3 is adjusted, and continuous correction of defocusing is achieved.

The reflector 12 is arranged in parallel with the second beam splitter 13, the sighting target object lens 11 is arranged in the direction of the emergent ray of the reflector, and the sighting target display device 8 is arranged at the rear side position of the sighting target object lens 11.

The first relay telescope 3 comprises convex lenses arranged in parallel, and the optical paths of the two convex lenses are coaxial.

The cylindrical mirror pair 4 is arranged at the conjugate position of the pupil of the human eye 1, and light emitted by the near-infrared beacon light source 9 is collimated by the collimating objective lens 10, reflected by the second beam splitter 13 and the first beam splitter 5, and enters the human eye 1 through the cylindrical mirror pair 4, the first relay telescope 3 and the pupil imaging device 2; the light reflected by the fundus of the human eye 1 enters a wavefront sensor 7 through a pupil imaging device 2, a first relay telescope 3, a cylindrical lens pair 4, a first spectroscope 5 and a second relay telescope 6 to objectively measure the human eye refractive error (defocusing, astigmatism and astigmatism axial directions); according to the measured human eye refractive error, the distance between two lenses of the first relay telescope 3 along the optical axis is changed to compensate the defocusing of the human eye, the cylindrical lens pair 4 is rotated around the optical axis to compensate the astigmatism of the human eye, after the compensation of the human eye refractive error is completed, the sighting target display device 8 displays a sighting target of a specific type, and the human eye 1 observes the sighting target displayed on the sighting target display device 8 through the first relay telescope 3, the cylindrical lens pair 4, the first spectroscope 5, the second spectroscope 13, the reflecting mirror 12 and the sighting target objective 11.

The optical diaphragm with the center shielding is adopted in the scheme, enters human eyes after passing through the polarizing plate 15 and the optical system, the analyzer plate 16 is arranged in front of the wavefront sensor, and the polarization direction is orthogonal to the polarization direction of the polarizing plate 15 so as to eliminate the influence of backward reflection light at the vertex of the surface of the lens and the vertex of the cornea of the human eyes on the wavefront sensor. Meanwhile, a small aperture diaphragm 17 with a proper aperture is added at the common focus of the relay telescope to filter out stray light caused by other layers of retina, cornea and lens surface. A band-pass filter is added at the front end of the wavefront sensor to eliminate the influence of ambient illumination light on the wavefront sensor; the influence of various stray lights on the refractive error of the human eyes measured by the wavefront sensor is eliminated.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements 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 an accurate optometry device of subjective and objective integral type with stray light mechanism disappears, includes infrared beacon light source, collimating objective, speculum, second spectroscope, first relay telescope, second relay telescope and wavefront sensor, and each subassembly combination forms accurate optometry device, its characterized in that: an annular diaphragm and a polarizing plate are arranged on the light path of the infrared beacon light source and the collimating objective lens, the annular diaphragm and the polarizing plate are sequentially arranged between the collimating objective lens and the second spectroscope, an analyzer is arranged in front of the wavefront sensor, and the analyzer is arranged between the second relay telescope and the first spectroscope; and the second relay telescope is provided with a small aperture diaphragm.

2. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 1, wherein: and a band-pass filter with the central wavelength consistent with or close to the beacon wavelength is arranged at the front end of the wavefront sensor.

3. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 2, wherein: the deflection direction of the analyzer is orthogonal to the polarization direction of the polarizer.

4. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 3, wherein: the second relay telescope comprises 2 lenses, and the aperture diaphragm is arranged at the common focus of the two lenses.

5. An objective and subjective integrated precision optometric instrument with a parasitic light eliminating mechanism according to claim 2, 3 or 4, wherein: the annular diaphragm and the polarizing plate are of an integral structure, the analyzer and any lens in the second relay telescope are of an integral structure, and the band-pass filter and the micro-lens array of the wavefront sensor are of an integral structure.

6. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 5, wherein: the annular diaphragm is connected with the rotating mechanism, and the rotating mechanism is used for rapidly rotating the annular diaphragm to shield the light path.

7. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 6, wherein: the annular diaphragm comprises an outer shading ring, a central shading plate and a connecting part; the central shading plate is connected with the outer shading ring through a connecting part, a gap is arranged between the outer shading ring and the central shading plate, and the gap is a light transmission part.

8. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 7, wherein: the system also comprises an eye refraction correction subsystem, an eyeball positioning subsystem and a viewing function testing subsystem; the human eye refraction correction subsystem comprises a first relay telescope and a cylindrical mirror pair, the eyeball positioning subsystem comprises a pupil imaging device, and the subjective visual function test subsystem comprises a visual target display device and a visual target objective lens; the human eye refractive objective measurement subsystem and the human eye refractive correction subsystem share a first relay telescope.

9. The accurate optometry unit of subjective and objective integral type with parasitic light eliminating mechanism of claim 8, wherein: the cylindrical mirror pair is arranged between the first relay telescope and the first spectroscope, the cylindrical mirror pair is coaxial with the optical path of the first relay telescope, the primary optical path of the first spectroscope is coaxial with the optical path of the second relay telescope, the light splitting path of the first spectroscope is coaxial with the primary optical path of the second spectroscope, the light splitting path of the second spectroscope is coaxial with the optical path of the collimating objective lens, the infrared beacon light source is arranged at the rear position of the collimating objective lens, and the wavefront sensor is arranged at the rear position of the second relay telescope; the cylindrical mirror pair is arranged on an optical loop between the first relay telescope and the first spectroscope, the steering angle of a single cylindrical mirror in the cylindrical mirror pair is adjusted, continuous correction on astigmatism of eyes is achieved, the distance of a lens in the first relay telescope is adjusted, and continuous correction on defocusing is achieved; the reflector is arranged in parallel with the second spectroscope, the sighting target objective lens is arranged in the direction of emergent rays of the reflector, and the sighting target display device is arranged at the rear side position of the sighting target objective lens; the first relay telescope comprises convex lenses arranged in parallel, and the optical paths of the two convex lenses are coaxial.