CN113940812A - Cornea center positioning method for excimer laser cornea refractive surgery - Google Patents
Cornea center positioning method for excimer laser cornea refractive surgery Download PDFInfo
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- CN113940812A CN113940812A CN202111283757.2A CN202111283757A CN113940812A CN 113940812 A CN113940812 A CN 113940812A CN 202111283757 A CN202111283757 A CN 202111283757A CN 113940812 A CN113940812 A CN 113940812A
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- 210000004087 cornea Anatomy 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001356 surgical procedure Methods 0.000 title claims abstract description 15
- 210000001747 pupil Anatomy 0.000 claims abstract description 42
- 238000005286 illumination Methods 0.000 claims abstract description 14
- 238000012876 topography Methods 0.000 claims abstract description 5
- 238000009825 accumulation Methods 0.000 claims description 6
- 230000001953 sensory effect Effects 0.000 abstract description 2
- 210000001508 eye Anatomy 0.000 description 6
- 230000004075 alteration Effects 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000000554 iris Anatomy 0.000 description 2
- 210000000697 sensory organ Anatomy 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 208000029091 Refraction disease Diseases 0.000 description 1
- 230000004430 ametropia Effects 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000000860 keratorefractive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 208000014733 refractive error Diseases 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F9/00802—Methods or devices for eye surgery using laser for photoablation
- A61F9/00804—Refractive treatments
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F2009/00861—Methods or devices for eye surgery using laser adapted for treatment at a particular location
- A61F2009/00872—Cornea
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Optics & Photonics (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Physics & Mathematics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Veterinary Medicine (AREA)
- Laser Surgery Devices (AREA)
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Abstract
The invention discloses a cornea center positioning method for excimer laser cornea refractive surgery, which comprises the following steps: setting an illumination brightness value, concentrating the illumination brightness value on a cornea part, simultaneously acquiring and recording the size of a pupil and the position of the pupil center relative to the vertex center of a corneal topography through an instrument, and transmitting an acquired image to computer processing equipment; the diameter R of the pupil is collected through the computer processing equipment, the value taking area is determined according to the center of the pupil by the computer processing equipment, all points are selected to be set as undetermined centers of circles according to the accumulated values in the area, the distance between the boundary point and the center of the circle is calculated at the same time, the accumulated value data is compared, and therefore the linear distance between the center of the cornea and the center of the pupil is obtained, manual and sensory positioning by a doctor is not needed, accuracy of positioning the center of the cornea is guaranteed, errors are greatly reduced, and practical application and operation are facilitated.
Description
Technical Field
The invention belongs to the technical field of excimer laser cornea refractive surgery, and particularly relates to a cornea center positioning method for excimer laser cornea refractive surgery.
Background
In the existing life, excimer laser corneal surface ablation is the first surgical method for correcting ametropia by applying laser in ophthalmology, in recent years, LASIK and LASEK are developed on the basis of PRK surgery, pupils are the holes surrounded by irises and are important components of an optical system of human eyes, the main function of the excimer laser corneal surface ablation is to maintain the stability of light rays entering eyeground under different illumination environments by changing the size, in addition, the size of the pupils also has great influence on the focal depth of eye imaging and the aberration of the whole eye, and in the laser refractive surgery, the positioning and the maintenance of a corneal ablation center are vital, especially in the laser refractive surgery guided by aberration. In laser refractive surgery, for ease of operation, it is generally assumed that the treatment center passes through the theoretical visual axis and corneal vertex. However, to solve this problem, the current method is to introduce a fixed shift amount to compensate for the difference, and to track the pupil center, but the treatment zone is centered at the corneal vertex close to the visual axis, so that the corneal center positioning is also an important step in excimer laser keratorefractive surgery.
However, in the prior art, the corneal center is positioned simply by relying on the sense organ of the doctor and the center position of the pupil, and such positioning methods have many external influence factors, the positioning result is not accurate enough, and the experience and the sense organ operation of the doctor are extremely tested.
The invention content is as follows:
the present invention has been made to solve the above problems, and an object of the present invention is to provide a method for corneal centration in excimer laser corneal refractive surgery, which solves the problems mentioned in the background art.
In order to solve the above problems, the present invention provides a technical solution:
a corneal center positioning method for excimer laser corneal refractive surgery, comprising the steps of:
s1, setting an illumination brightness value, concentrating the illumination brightness value on a cornea part, simultaneously collecting and recording the size of a pupil and the position of the pupil center relative to the vertex center of a corneal topography through an instrument, and transmitting the collected image to computer processing equipment;
s2, collecting the diameter R of the pupil through computer processing equipment, determining the circle center position of the pupil according to the diameter, and establishing a rectangular coordinate system by taking the circle center position of the pupil as a coordinate dot;
s3, setting the center (Xn, Yn) of the cornea to be in a circular area H with the center of the pupil as the center and the diameter of M;
s4, setting up coordinate E in circular area H0(A0，B0) And simultaneously calculating to obtain an accumulated edge coordinate F0(A0，B1) Coordinate E0And edge coordinate F0The straight-line distance between is | B1|-|B0And setting an accumulation point C (i, j);
s5, taking a point (Xj, Yi) from the region H as the center of the to-be-determined cornea;
s6, searching (1/4) pi- (2/4) pi and (37/4) pi- (5 pi)/4 boundary points by taking (Xj, Yi) as a circle center, and simultaneously calculating the distance j between the boundary points and the circle center;
s7, repeating the step S4, and taking all points E in the circular area H0And finding out the maximum value of C (i, j) by using computer processing equipment, wherein i is the straight-line distance between the circle center of the cornea and the circle center of the pupil.
Preferably, the illumination brightness value is set to 78-96 in the step S1, and the instrument in the step S1 is a near-infrared camera.
Preferably, the computer processing device in step S2 is a laser machine with an eye tracking system.
Preferably, the diameter M of the circular region H in the step S3 is 2/3R.
Preferably, i in the step S4 represents a sequence number in the region H, and j in the step S4 represents a radius value in the region H.
Preferably, in step S4, the point C and the coordinate E are accumulated0Is less than | B1|-|B0|。
Preferably, the radius of the circle center of the undetermined cornea selected in the step S5 is limited to 0.4R-0.9R.
Preferably, in step S7, all points E are repeatedly taken0When the pupil is taken as a coordinate dot, values are respectively taken in the first quadrant, the second quadrant, the third quadrant and the fourth quadrant by taking the center position of the pupil as the coordinate dot.
The invention has the beneficial effects that: the invention utilizes computer processing equipment to determine a value-taking area according to the center of the pupil, selects all points in the area to be set as undetermined centers according to the accumulated value, simultaneously calculates the distance between the boundary point and the center of the pupil, and compares the accumulated value data to obtain the linear distance between the center of the cornea and the center of the pupil, thereby further not needing to carry out manual and sensory positioning by a doctor, ensuring the accuracy of positioning the center of the cornea, greatly reducing the occurrence of errors and being beneficial to practical application and operation.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a flow chart of the corneal centration method of the present invention for excimer laser corneal refractive surgery.
The specific implementation mode is as follows:
as shown in fig. 1, the following technical solutions are adopted in the present embodiment:
example (b):
a corneal center positioning method for excimer laser corneal refractive surgery, comprising the steps of:
s1, setting an illumination brightness value, concentrating the illumination brightness value on a cornea part, simultaneously collecting and recording the size of a pupil and the position of the pupil center relative to the vertex center of a corneal topography through an instrument, and transmitting the collected image to computer processing equipment;
s2, collecting the diameter R of the pupil through computer processing equipment, determining the circle center position of the pupil according to the diameter, and establishing a rectangular coordinate system by taking the circle center position of the pupil as a coordinate dot;
s3, setting the center (Xn, Yn) of the cornea to be in a circular area H with the center of the pupil as the center and the diameter of M;
s4, setting up coordinate E in circular area H0(A0，B0) And simultaneously calculating to obtain an accumulated edge coordinate F0(A0，B1) Coordinate E0And edge coordinate F0The straight-line distance between is | B1|-|B0Is provided in parallelSetting an accumulation point C (i, j);
s5, taking a point (Xj, Yi) from the region H as the center of the to-be-determined cornea;
s6, searching boundary points in (1/4) pi- (2/4) pi and (37/4) pi- (5 pi)/4 by taking (Xj, Yi) as a circle center, and simultaneously calculating the distance j between the boundary points and the circle center, so that the interference of iris textures is better eliminated;
s7, repeating the step S4, and taking all points E in the circular area H0And finding out the maximum value of C (i, j) by using computer processing equipment, wherein i is the straight-line distance between the circle center of the cornea and the circle center of the pupil.
In step S1, the illumination brightness value is set to 78-96, and the instrument in step S1 is a near-infrared camera, so as to more clearly capture images.
The computer processing device in step S2 is a laser machine with an eye tracking system, and the position and diameter of the center of the pupil can be better determined by the laser machine with the eye tracking system.
In step S3, the diameter M of the circular region H is 2/3R, which facilitates better assurance of accuracy of the value determination.
Wherein, i in the step S4 represents the sequence number in the region H, and j in the step S4 represents the radius value in the region H, so as to more intuitively represent the technical numerical value.
Wherein, in the step S4, the point C and the coordinate E are accumulated0Is less than | B1|-|B0And l, the better guarantee that the accumulation point is always positioned inside the edge of the circle center area is facilitated.
In step S5, the radius of the circle center of the to-be-determined cornea is selected and limited to 0.4R-0.9R, which facilitates better reduction of calculation amount.
Wherein, in the step S7, all points E are repeatedly taken0In the process, the position of the center of the pupil circle is taken as a coordinate dot, and values are respectively taken in the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, so that comparison calculation of data in different quadrants is facilitated.
Specifically, the method comprises the following steps: in practical applicationFirstly, setting an illumination brightness value to be 80, concentrating the illumination brightness value on a cornea part, simultaneously collecting and recording the size of a pupil and the position of the pupil center relative to the vertex center of a corneal topography through an instrument, and transmitting a collected image to computer processing equipment; then, acquiring the diameter R of the pupil through a laser machine with an eyeball tracking system, determining the circle center position of the pupil according to the diameter, and establishing a rectangular coordinate system by taking the circle center position of the pupil as a coordinate dot; then, the center (Xn, Yn) of the cornea is set to be within a circular area H with the diameter M and the center of the pupil, wherein the diameter M of the circular area H is 2/3R; then, in the circular region H, coordinates E are set0(A0，B0) And simultaneously calculating to obtain an accumulated edge coordinate F0(A0，B1) Coordinate E0And edge coordinate F0The straight-line distance between is | B1|-|B0And an accumulation point C (i, j) is set, where i represents a serial number within the area H, j in the step S4 represents a radius value within the area H, and the accumulation point C and the coordinate E are added0Is less than | B1|-|B0L, |; taking a point (Xj, Yi) from the region H as the center of the to-be-determined cornea, wherein the radius of the center of the to-be-determined cornea is limited to 0.4R-0.9R; searching (1/4) pi- (2/4) pi and (37/4) pi- (5 pi)/4 boundary points by taking (Xj, Yi) as a circle center, and simultaneously calculating the distance j between the boundary points and the circle center; then, repeating the above steps, and taking all points E in the circular area H0Finding out the maximum value of C (i, j) by computer processing equipment, wherein i is the linear distance between the center of the cornea and the center of the pupil, and repeatedly taking all points E0When the pupil is taken as a coordinate dot, values are respectively taken in the first quadrant, the second quadrant, the third quadrant and the fourth quadrant by taking the center position of the pupil as the coordinate dot.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A corneal center positioning method for excimer laser corneal refractive surgery, comprising the steps of:
s1, setting an illumination brightness value, concentrating the illumination brightness value on a cornea part, simultaneously collecting and recording the size of a pupil and the position of the pupil center relative to the vertex center of a corneal topography through an instrument, and transmitting the collected image to computer processing equipment;
s2, collecting the diameter R of the pupil through computer processing equipment, determining the circle center position of the pupil according to the diameter, and establishing a rectangular coordinate system by taking the circle center position of the pupil as a coordinate dot;
s3, setting the center (Xn, Yn) of the cornea to be in a circular area H with the center of the pupil as the center and the diameter of M;
s4, setting up coordinate E in circular area H0(A0，B0) And simultaneously calculating to obtain an accumulated edge coordinate F0(A0，B1) Coordinate E0And edge coordinate F0The straight-line distance between is | B1|-|B0And setting an accumulation point C (i, j);
s5, taking a point (Xj, Yi) from the region H as the center of the to-be-determined cornea;
s6, searching (1/4) pi- (2/4) pi and (37/4) pi- (5 pi)/4 boundary points by taking (Xj, Yi) as a circle center, and simultaneously calculating the distance j between the boundary points and the circle center;
s7, repeating the step S4, and taking all points E in the circular area H0And finding out the maximum value of C (i, j) by using computer processing equipment, wherein i is the straight-line distance between the circle center of the cornea and the circle center of the pupil.
2. The method for corneal centration according to claim 1, wherein the illumination brightness value is set to 78 to 96 in step S1, and the apparatus in step S1 is a near-infrared camera.
3. The method of claim 1, wherein the computer processing device of step S2 is a laser machine with an eye tracking system.
4. The method for corneal centration according to claim 1, wherein the diameter M of the circular region H in step S3 is 2/3R.
5. The method of claim 1, wherein i in the step S4 represents the number of the sequence in the region H, and j in the step S4 represents the radius value in the region H.
6. The method for corneal centration according to claim 1, wherein the point C and the coordinate E are accumulated in step S40Is less than | B1|-|B0|。
7. The method for corneal centration according to claim 1, wherein the step S5 is performed such that the radius of the center of the cornea to be determined is limited to 0.4R-0.9R.
8. The method for corneal centration according to claim 1, wherein the step S7 is performed by repeating all points E0When the pupil is taken as a coordinate dot, values are respectively taken in the first quadrant, the second quadrant, the third quadrant and the fourth quadrant by taking the center position of the pupil as the coordinate dot.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114129126A (en) * | 2022-01-29 | 2022-03-04 | 北京九辰智能医疗设备有限公司 | Cornea center positioning method, device, equipment and storage medium |
| CN116777794A (en) * | 2023-08-17 | 2023-09-19 | 简阳市人民医院 | Cornea foreign body image processing method and system |
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| CN116777794B (en) * | 2023-08-17 | 2023-11-03 | 简阳市人民医院 | Cornea foreign body image processing method and system |
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| CN113940812B (en) | 2024-02-27 |
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