CN114711713A

CN114711713A - Triangular fixed-focus positioning system and method based on corneal topography

Info

Publication number: CN114711713A
Application number: CN202210356322.4A
Authority: CN
Inventors: 朱永林
Original assignee: SUZHOU KANGJIE MEDICAL Inc
Current assignee: SUZHOU KANGJIE MEDICAL Inc
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-07-08

Abstract

The invention relates to a triangular fixed-focus positioning system and method based on a corneal topography, and the system comprises an infrared laser, an auto-collimation lens, a laser adjusting base, a Prasist disc, an imaging lens group and a camera, wherein the infrared laser and the auto-collimation lens are arranged on the laser adjusting base, the laser adjusting base is arranged at the rear end of a sleeve, the Prasist disc is arranged in the sleeve, the imaging lens group is arranged at the rear end of the sleeve, the camera is arranged right opposite to the imaging lens group and fixedly arranged on the sleeve, a first through hole is arranged at the central position of the Prasist disc, a second through hole right opposite to the auto-collimation lens is arranged on the Prasist disc, a simulation eye is arranged at the front end of the sleeve, and the simulation eye and the imaging lens group are arranged right opposite. According to the invention, the angle of the laser beam emitted by the infrared laser is adjusted by the laser adjusting base, the camera automatically identifies whether the reflected light point is overlapped with the through hole of the Prasise disk or not, and automatic shooting is carried out during overlapping, so that the operation is simple, the efficiency is high, professional technicians are not required, and the shooting accuracy and the repeatability are high.

Description

Triangular fixed-focus positioning system and method based on corneal topography

Technical Field

The invention relates to the technical field of corneal topography, in particular to a triangular fixed-focus positioning system and method based on a corneal topography.

Background

The corneal topography is clinically applied to diagnosis of corneal astigmatism, corneal characteristics are quantitatively analyzed, corneal flexion is displayed by data or different colors, and the difference of two-axis flexion is the corneal astigmatism. The emergence of corneal topography makes the early diagnosis of the keratoconus and the keratoconus in the sub-clinical period possible, and the accuracy of the keratoconus diagnosis is up to 96%. In addition, the method can be used for diagnosing corneal distortion induced by a corneal contact lens. When the cornea is measured by using the cornea topographer, the measuring accuracy can be ensured only by positioning the top point of the eyeball at the set position of the instrument. At present, a common method is to specially arrange a positioning mark on a bracket to limit the position of the measured eye so as to meet the measurement requirements of the corneal topographer. The method for limiting by adopting a mechanical mode has low positioning precision, and is easy to generate larger deviation in repeated measurement to influence the measurement accuracy.

There are cataract surgery, IOL lens calculation, contact lens adaptation and refractive laser surgery in corneal topography applications, and the topography method is subject to high requirements in terms of measurement accuracy and repeatability, which requires improvement of the conventional topography method or development of new methods. The topography methods known at present are based on specially matched deflection measurements, fringe projection, etc. Thus, the corneal radius can be determined with an accuracy of up to about +/-0.05mm using a keratometer or refractometer. But at present such accuracy does not meet the requirements of the above applications.

In addition, when an ophthalmologist uses the corneal topographic map, accurate diagnosis data can be obtained only by obtaining a clear corneal topographic map, so that higher requirements are put on operation, and the cornea topographic map can not be normally used by ordinary people; the use efficiency of the device is low; it takes a long time.

Disclosure of Invention

The invention aims to provide a cornea topography based triangulation fixed focus positioning system and method, which are used for solving the problems of low measurement precision and poor repeatability of a cornea topography method in the prior art.

The invention provides a triangular fixed-focus positioning system based on a corneal topography, which comprises an infrared laser, an auto-collimation lens, a laser adjusting base, a Prasist disc, an imaging lens group and a camera, wherein the infrared laser and the auto-collimation lens are arranged in an opposite mode and are both arranged on the laser adjusting base, the laser adjusting base is arranged at the rear end of a sleeve, the Prasist disc is arranged in the sleeve, the imaging lens group is arranged at the rear end of the sleeve, the camera is arranged in an opposite mode to the imaging lens group and is fixedly arranged on the sleeve, a first through hole is formed in the center of the Prasist disc and is arranged in an opposite mode to the imaging lens group, a second through hole in an opposite mode to the auto-collimation lens is formed in the Prasist disc, an analog eye is arranged at the front end of the sleeve, and the analog eye and the imaging lens group are arranged in an opposite mode.

Furthermore, an inclined through hole is formed in the sleeve, and an auto-collimation lens is arranged in the through hole.

Further, the inboard embedding sleeve of formation of image lens group and outside fixed mounting on the mounting panel, mounting panel fixed mounting is on the sleeve, the outside fixed mounting camera of mounting panel.

Further, the camera is a COMSX camera.

The invention provides a triangle fixed-focus positioning method based on a corneal topography, which comprises the following steps:

(1) the infrared laser emits laser beams, the collimated laser beams are projected by the auto-collimation lens, and the collimated laser beams penetrate through the through hole II of the Pulas disc and are projected to the position of the cornea center point of the simulated eye;

(2) reflecting the light beam on the simulated eye;

(3) the reflected light spot is projected to an imaging lens group, and the camera performs image recognition and starts to take a picture.

Further, step (3) still include that the laser instrument adjusts the base and adjusts the angle that infrared laser instrument launches the laser beam, and then adjusts the position of reflection light spot at the plausis dish, when the camera discerned that reflection light spot and the through-hole of plausis dish coincide, starts to shoot, obtains clear and accurate cornea topography image.

The technical scheme of the invention has the beneficial effects that:

the triangular fixed-focus positioning system based on the corneal topography adjusts the angle of the laser beam emitted by the infrared laser through the laser adjusting base, the camera automatically identifies whether the reflected light point is coincident with the through hole of the placian disc or not, automatic photographing is carried out during coincidence, the operation is simple, the efficiency is high, professional technicians are not needed, and the photographing accuracy is high and the repeatability is good.

Drawings

FIG. 1 is a schematic diagram of a corneal topography-based triangulation fixed-focus positioning system according to the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

the system comprises an infrared laser 1, an auto-collimation lens 2, a laser adjusting base 3, a placian disc 4, an imaging lens group 5, a camera 6, a sleeve 7, a simulated eye 8 and a mounting plate 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

As shown in fig. 1, the present embodiment is a triangular fixed-focus positioning system based on a corneal topography, which includes an infrared laser 1, an auto-collimation lens 2, a laser adjusting base 3, a plausis disc 4, an imaging lens set 5 and a camera 6, wherein the infrared laser 1, the auto-collimation lens 2 and the laser adjusting base 3 form an emitting optical signal unit, the imaging lens set 5 and the camera 6 form a receiving optical signal unit, the emitting optical signal unit and the receiving optical signal unit form an included angle α, the infrared laser 1 and the auto-collimation lens 2 are arranged opposite to each other and both mounted on the laser adjusting base 3, the laser adjusting base 3 is mounted at the rear end of a sleeve 7, the plausis disc 4 is mounted in the sleeve 7, the imaging lens set 5 is mounted at the rear end of the sleeve 7, the camera 6 is arranged opposite to the imaging lens set 5 and is fixedly mounted on the sleeve 7, a first through hole is arranged at the center position of the plausis disc 4, the first through hole is opposite to the imaging lens group 5, the second through hole opposite to the auto-collimation lens 2 is formed in the Prussian disc 4, the simulation eye 8 is arranged at the front end of the sleeve 7, and the simulation eye 8 is opposite to the imaging lens group 5. In the embodiment, the light-emitting signal unit emits a collimated laser beam safe to human eyes, the light beam is projected to the central position of the cornea of the simulated eye 8, the light spot is reflected to the light-receiving signal unit, and the camera 6 of the light-receiving signal unit starts shooting to obtain a cleaned corneal topography when recognizing that the reflected light spot is overlapped with a through hole I arranged at the central position of the Pulas disc 4.

Specifically, the sleeve 7 is provided with an inclined through hole, and the auto-collimation lens 2 is arranged in the through hole.

Specifically, the inboard embedding sleeve 7 of formation of image lens group 5 is interior and outside fixed mounting on mounting panel 9, mounting panel 9 fixed mounting is on sleeve 7, the outside fixed mounting camera 6 of mounting panel 9, camera 6 is COMSX camera 6.

Another embodiment is a method for triangulating a corneal topography, comprising the steps of:

(1) the infrared laser 1 emits laser beams, the collimated laser beams are projected through the auto-collimation lens 2, and the collimated laser beams pass through the through hole II of the Pulas disc 4 and are projected to the position of the cornea center point of the simulated eye 8;

(2) the light beam is reflected on the simulated eye 8;

(3) the reflected light spot is projected to the imaging lens group 5, and the camera 6 performs image recognition and starts photographing.

Specifically, the step (3) further comprises the step of adjusting the angle of the laser beam emitted by the infrared laser 1 by the laser adjusting base 3, further adjusting the position of the reflected light spot on the plausis disc 4, and when the reflected light spot is identified to coincide with the through hole of the plausis disc 4 by the camera 6, starting to take a picture to obtain a clear and accurate corneal topographic image.

In conclusion, the triangular fixed-focus positioning system based on the corneal topography adjusts the angle of the laser beam emitted by the infrared laser through the laser adjusting base, the camera automatically identifies whether the reflected light point is coincident with the through hole of the placian disc or not, automatic photographing is carried out during coincidence, the operation is simple, the efficiency is high, professional technicians are not needed, and the photographing accuracy is high and the repeatability is good.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a triangle tight positioning system based on cornea topography, its characterized in that, includes infrared laser instrument, auto-collimation lens, laser instrument adjustment base, placian dish, formation of image lens group and camera, infrared laser instrument and auto-collimation lens are just to setting up, and the two all installs on laser instrument adjustment base, laser instrument adjustment base installs in the sleeve rear end, the placian dish is installed in the sleeve, the formation of image lens group is installed in the sleeve rear end, the camera is just setting up and fixed mounting on the sleeve to the formation of image lens group, the central point of placian dish puts and sets up through-hole one, and this through-hole one is just to the formation of image lens group setting, set up through-hole two just to the auto-collimation lens on the placian dish, telescopic front end sets up the simulation eye, the simulation eye is just to setting up with the formation of image lens group.

2. A corneal topography-based triangulation, fixed-focus positioning system according to claim 1 wherein said sleeve is provided with a slanted through hole in which an auto-collimating lens is disposed.

3. A corneal topography-based triangulation focus-fixing positioning system as claimed in claim 1, wherein said imaging lens group is embedded inside the sleeve and fixedly mounted on the mounting plate on the outside, said mounting plate being fixedly mounted on the sleeve, said mounting plate fixedly mounted on the outside with the camera.

4. The corneal topography-based triangulation, fixed-focus positioning system of claim 1, wherein said camera is a COMSX camera.

5. A triangular fixed-focus positioning method based on a corneal topography is characterized by comprising the following steps:

(2) reflecting the light beam on the simulated eye;

6. The corneal topography map-based triangular fixed-focus positioning method as claimed in claim 5, wherein the step (3) further comprises adjusting the angle of the laser beam emitted by the infrared laser by the laser adjusting base, so as to adjust the position of the reflected light spot on the plausi disc, and when the camera recognizes that the reflected light spot coincides with the through hole of the plausi disc, starting to take a picture to obtain a clear and accurate corneal topography map.