CN101069636A - Cornea cutting depth calculation based on personalized human eye model - Google Patents
Cornea cutting depth calculation based on personalized human eye model Download PDFInfo
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- CN101069636A CN101069636A CN 200610013616 CN200610013616A CN101069636A CN 101069636 A CN101069636 A CN 101069636A CN 200610013616 CN200610013616 CN 200610013616 CN 200610013616 A CN200610013616 A CN 200610013616A CN 101069636 A CN101069636 A CN 101069636A
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- 210000004087 cornea Anatomy 0.000 title claims abstract description 39
- 238000005520 cutting process Methods 0.000 title claims abstract description 19
- 230000004075 alteration Effects 0.000 claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 201000009310 astigmatism Diseases 0.000 claims abstract description 7
- 210000000695 crystalline len Anatomy 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims 3
- 238000002679 ablation Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000004438 eyesight Effects 0.000 abstract description 2
- 230000004382 visual function Effects 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 7
- 241001300078 Vitrea Species 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 208000001491 myopia Diseases 0.000 description 2
- 230000004379 myopia Effects 0.000 description 2
- 230000002980 postoperative effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 208000003164 Diplopia Diseases 0.000 description 1
- 208000029091 Refraction disease Diseases 0.000 description 1
- 230000004430 ametropia Effects 0.000 description 1
- 210000002159 anterior chamber Anatomy 0.000 description 1
- 210000001742 aqueous humor Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 208000014733 refractive error Diseases 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
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Abstract
本发明以个性化人眼模型为基础，计算个体人眼的角膜切削深度，矫正人眼的离焦、像散及高级像差，提高人眼的视功能，属于视觉矫正技术领域。本发明将实际测量的人眼波前像差、角膜特征参数及眼内各部分轴向间距数据用于个性化人眼模型的构建，然后在个性化人眼模型中优化角膜的前表面结构，矫正人眼的波前像差，并通过计算角膜形状的改变量来得到个体人眼的角膜切削深度。该角膜切削深度的计算方法能够更精确地计算实际个体人眼的角膜切削深度，可以根据个体人眼的实际光学特性矫正离焦、像散及高级像差。Based on a personalized human eye model, the invention calculates the corneal cutting depth of an individual human eye, corrects the defocus, astigmatism and advanced aberration of the human eye, improves the visual function of the human eye, and belongs to the technical field of vision correction. The present invention uses the actually measured human eye wavefront aberration, corneal characteristic parameters and axial distance data of each part in the eye to construct a personalized human eye model, and then optimizes the anterior surface structure of the cornea in the personalized human eye model to correct The wavefront aberration of the human eye, and the corneal ablation depth of the individual human eye is obtained by calculating the amount of change in the shape of the cornea. The method for calculating the depth of corneal ablation can more accurately calculate the depth of corneal ablation of an actual individual human eye, and can correct defocus, astigmatism, and advanced aberrations according to the actual optical characteristics of the individual human eye.
Description
Technical field
The invention belongs to the vision correcting technical field.
Background technology
Correct the ametropia of human eye carries out widely with the method for refractive surgery.Traditional Laser in Situ Keratomileusis (LASIK) has been tending towards ripe at aspects such as the myopia of correcting human eye, astigmatism, yet has complication such as postoperative dazzle, monocular diplopia.Its main cause is that traditional laser cornea cutting operation causes postoperative human eye senior aberration to increase easily.The cornea ablation operation of wave front aberration guiding not only can be corrected the myopia and astigmatism of human eye, and can reduce senior aberration, improves the visual quality of human eye, thereby is more and more paid close attention to by people.
At present, the calculating of the cornea ablation operation corneal cutting depth of wave front aberration guiding is to carry out with the method for OPD (optical pathdifference, the optical path difference from the retina to the measurement plane).
OPD=(n
c-n
0) d formula 1
Wherein, n
cThe refractive index of expression cornea, n
0The refractive index of expression air, d is the cutting depth of cornea tissue.
Different individual human eyes has different ophthalmic optical characteristics.The method of calculating cornea cutting depth with formula is not considered other characteristic parameter of the cornea shape of human eye and ophthalmic, not accurately to calculate cornea cutting depth according to the concrete feature of individual human eye, thereby compared error with ideal cutting depth, this error more be can not ignore for the bigger human eye of wave front aberration.
Summary of the invention
The purpose of this patent is that human eyes wave-front optical aberration, cornea characteristic parameter and the ophthalmic each several part axial spacing data with actual measurement are the fundamental construction lens structure, thereby further makes up personalized human-eye model.On this basis,, optimize the front surface shape of cornea, the wave front aberration of correcting human eye, the cutting depth of calculating cornea, the visual function of raising human eye by the optimizational function of Zemax software.
This invention has following function and advantage:
Function one, the wavefront aberration data of known actual human eye, cornea characteristic parameter and ophthalmic each several part axial spacing data, utilization optical design software Zemax makes up personalized human-eye model.
Function two based on personalized human-eye model, is optimized the front surface structure of cornea, not only corrects human eye out of focus and astigmatism, and corrects the senior aberration of human eye, improves the visual quality of human eye.
Cornea surface structure before and after the function three, calculation optimization obtains the cutting depth of the cornea of individual human eye along the difference of optical axis direction.
Concrete technical scheme
The technical scheme of this invention comprises following main aspect:
One is accurately measured the cornea front and rear surfaces shape of individual human eye by the medical cornea activity mapping instrument, carries out the shape match with the high order aspheric surface function and is placed in the eye model; Measure the axial width of each several parts such as human eye's anterior chamber, crystalline lens, vitreous body with medical A-mode ultrasonic wave technology, these thickness are imported in the eye model as optical interval; Lenticular surface configuration is optimized, makes the wave aberration of full eye equate with the actual wave aberration that personnel selection glances wavefront aberrometer measures.
Its two, optimize the structure of anterior surface of cornea, reduce the wave front aberration of human eye.
Its three, the anterior corneal surface structure after the optimization with optimize before the anterior corneal surface structure compare, calculate the difference of cornea along optical axis direction, obtain the cutting depth of individual eye cornea.
Its four, mobile anterior surface of cornea, the anterior surface of cornea cutting depth that solves behind the initial optimization is minus problem, carries out iteration optimization then, the defocusing amount that makes new generation is zero.
Description of drawings
Accompanying drawing 1 is the calculation flow chart that the present invention is based on the cornea cutting depth of personalized human-eye model.
Specify embodiments of the present invention below in conjunction with accompanying drawing.
Concrete embodiment
As shown in Figure 1, Hartmann-Shack Wavefront sensor [1] is used for measuring the wave front aberration of human eye, the aberration data of individual human eye is joined in the majorized function of optical design software Zemax, defines the actual aberration of human eye with this.
Corneal topographer Orbscan II[2] be used for measuring corneal curvature and cornea front and rear surfaces height value with respect to the reference sphere.Anterior corneal surface is converted into vertically difference in height along the difference in height of radius vector direction, simulates the non-spherical surface of cornea with the high order aspheric surface function.
A-mode ultrasonic calibrator [3] is used for measuring the each several part spacing of axis oculi, comprises cornea front and rear surfaces spacing, the camera oculi anterior degree of depth, lens thickness and Vitrea thickness.
The ophthalmic optical system comprises cornea, aqueous humor, crystalline lens and Vitrea medium refraction index [4] The data Gullstrand eye model numerical value.
The face type of crystalline lens [5] is set to Ze Nike rise face, optimizes lenticular front and rear surfaces, makes the wave aberration of full eye equate with the actual wave aberration that personnel selection glances wavefront aberrometer measures.Personalized human-eye model [6] made up and finished this moment.
Optimize anterior surface of cornea, the human-eye model after being optimized [7].On the basis of initial optimization, personalized human-eye model is carried out iteration optimization, obtain the human-eye model [8] after the iteration optimization, this eye model can be corrected the out of focus [9] of human eye, astigmatism [10], senior aberration [11], and the cutting depth [12] that calculates cornea.
Claims (3)
1. the computational methods based on the cornea cutting depth of personalized human-eye model comprise cornea, crystalline lens and amphiblestroid structure.It is characterized in that: the wave front aberration by personalized human-eye model full aberration that gets and the actual human eye that measures with wavefront analyzer equates.
2. require the computational methods of described cornea cutting depth based on personalized human-eye model according to right 1, it is characterized in that: be optimized by Zemax software corneal front surface structure, not only can correct the out of focus and the astigmatism of human eye, and the senior aberration that can correct human eye.
3. require the computational methods of described cornea cutting depth based on personalized human-eye model according to right 1, it is characterized in that: before and after optimizing, anterior surface of cornea is the cutting depth of cornea along the difference of optical axis direction.
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| CN 200610013616 CN101069636A (en) | 2006-05-09 | 2006-05-09 | Cornea cutting depth calculation based on personalized human eye model |
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| CN 200610013616 CN101069636A (en) | 2006-05-09 | 2006-05-09 | Cornea cutting depth calculation based on personalized human eye model |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467612A (en) * | 2010-11-18 | 2012-05-23 | 沈阳理工大学 | Construction method of personalized eye optical model |
| CN104298815A (en) * | 2014-09-23 | 2015-01-21 | 南京邮电大学 | Reverse construction method for human eye average model |
| CN106291923A (en) * | 2016-10-25 | 2017-01-04 | 吉林大学 | A kind of projection helmet objective designing method of corrective ophthalmic optical aberration |
| CN114587775A (en) * | 2020-12-04 | 2022-06-07 | 艾维斯技术有限责任公司 | Customized ablation for correcting vision ametropia |
| CN114748242A (en) * | 2022-04-13 | 2022-07-15 | 南开大学 | A method and device for designing corneal ablation for wavefront-guided refractive surgery |
| CN115336967A (en) * | 2022-09-19 | 2022-11-15 | 南开大学 | Method for obtaining retinal morphology |
-
2006
- 2006-05-09 CN CN 200610013616 patent/CN101069636A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467612A (en) * | 2010-11-18 | 2012-05-23 | 沈阳理工大学 | Construction method of personalized eye optical model |
| CN104298815A (en) * | 2014-09-23 | 2015-01-21 | 南京邮电大学 | Reverse construction method for human eye average model |
| CN106291923A (en) * | 2016-10-25 | 2017-01-04 | 吉林大学 | A kind of projection helmet objective designing method of corrective ophthalmic optical aberration |
| CN114587775A (en) * | 2020-12-04 | 2022-06-07 | 艾维斯技术有限责任公司 | Customized ablation for correcting vision ametropia |
| CN114748242A (en) * | 2022-04-13 | 2022-07-15 | 南开大学 | A method and device for designing corneal ablation for wavefront-guided refractive surgery |
| CN115336967A (en) * | 2022-09-19 | 2022-11-15 | 南开大学 | Method for obtaining retinal morphology |
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