CN101669850A - MTF based optimization design for customized human eye correction model - Google Patents
MTF based optimization design for customized human eye correction model Download PDFInfo
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Abstract
On the basis of a customized human eye model, the invention designs an optimized ablation mode for a refractive surgery to correct out-of-focus, astigmatism and other aberrations, and belongs to the technical field of orthoptics of human eyes. The design uses actually-measured human eye wavefront aberrations, cornea characteristic parameters and axial spacing data of each part in eyes in construction of the customized human eye model, and acquires respectively MTF of a whole eye, the cornea and crystalline lens through the optimization function of Zemax software. The design acquires the customized visual function through correlation between the aberration and a contrast sensitivity function, designs the optimized customized ablation so as to acquire the optimized visual quality. The customized visual quality can better meet the requirement of an operative patient on visual quality.
Description
Technical field
The invention belongs to the vision correcting technical field.
Background technology
In recent years, along with the continuous development of modern optometry theory and technology, excimer laser surgery more and more is subjected to people's attention as the ametropic instrument of a kind of rectification human eye.Refraction correction surgery in the past all is to be that a sphere model cuts with anterior corneal surface, and for example the shape cutting Model of description such as Munnerlyn is " Sharp-subtraction " pattern, and the cornea shape that nature is evolved changes, thereby has influenced visual quality.
Studies show that, operations such as PRK, LASIK, LASEK are because laser cutting has changed the shape of cornea, make human eye become non-physiological state (Oblate central authorities are smooth, and the edge is precipitous), cause a series of optical problem thus by original normal physiological state (Prolate asphericity).Show that in the research of Fabrice Manns etc. exist between the change of this cornea form and the spherical aberration and contact directly, the degree of myopia correction is dark more, spherical aberration is big more, and higher order aberratons also can change thereupon.
The main means that are applied to estimate the human eye visual quality at present are to consider the vision of cone cell and action of nervous system and contrast sensitivity function CSF (Contrast Sensitivity Function) etc.Because the measurement of vision and contrast sensitivity all needs measured's subjectivity to participate in, and can not really reflect visual quality, therefore needs more responsive evaluation methodology accurately.And aberration interacts between each rank as the instrument of reflection eyes and brain resultant effect, influences each other, and single aberration data can not truly reflect the optical quality of human eye, therefore also needs a kind of objective method.
In addition, correction of refractive errors in the past mainly is to be converted by optometry method, do not consider the wavefront aberration data of individual human eye, thereby also just can't accurately calculate the diopter of cornea and higher order aberratons etc. according to the concrete characteristic parameter of individual human eye, thereby make the refractive surgery that on cornea, carries out have certain error, therefore need a kind of new refraction correction surgery method.
Summary of the invention
This patent is application of modulation transfer function MTF (Modulation Transfer Function) corneal refractive surgery (LASIK, PRK, a series of types such as EPI-LASIK) Qian Hou visual quality is assessed, by human eyes wave-front optical aberration, cornea characteristic parameter and ophthalmic each several part axial spacing data with actual measurement is the fundamental construction personalized human-eye model, optimizational function by optical design software Zemax, design human eye optimal light structure, instruct and select the optimized operation plan of human eye is improved the optical quality and the visual performance of human eye dioptric system.
This invention has following function and advantage:
Function one according to the full wavefront aberration data that actual measurement obtains, is calculated the MTF of full eye.
Function two according to actual measurement gained cornea front and rear surfaces altitude information, is calculated cornea front and rear surfaces aberration, further obtains the MTF of cornea.
Function three, according to known actual persons wavefront aberration data, cornea characteristic parameter and ophthalmic each several part axial spacing data, utilization optical design software Zemax makes up personalized human-eye model.
Function four based on personalized human-eye model, is utilized the optimizational function of Zemax software, obtains lenticular aberration and MTF, and design human eye optimal light structure instructs the selection of optimization operation plan.
Function five according to the association between aberration and the contrast sensitivity function CSF, is obtained personalized visual function, thereby is obtained optimized visual quality.
Concrete technical scheme
The technical scheme of this invention comprises following main aspect:
One according to the survey wave front aberration, makes up the human eye pupil function, and the optical transfer function of opthalmic optics system is the self correlation of pupil function, and the optical transfer function delivery can obtain corresponding modulation transfer function (MTF).
Its two, accurately measure the cornea front and rear surfaces height map of individual human eye by the medical cornea activity mapping instrument, carry out the shape match with the high order aspheric surface function and be placed in the eye model; Measure axial width between people's each several part 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 three, based on the human-eye model that makes up, utilize the optimizational function of Zemax software, the designing optimal operation plan.Utilize the related of aberration and contrast sensitivity, obtain the optimum visual quality.
Description of drawings
Accompanying drawing 1 is the design flow diagram that the present invention is based on the optimization visual quality of personalized 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.In addition, also can calculate full eye MTF according to this wave aberration.
Pentacam eye anterior segment analysis system [2] is used for measuring corneal curvature and the 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.
Calculate lenticular aberration and MTF by crystalline honorable type.Utilize the association between it and the full eye contrast sensitivity function [7], obtain personalized visual function.
Itracy wavefront aberrometer [8] is used for measuring cornea front and rear surfaces aberration, calculates the MTF of cornea front and rear surfaces.Full eye MTF is calculated by full aberration and obtains.In conjunction with personalized visual function, the cutting mode of design optimization reaches the purpose of out of focus [9], astigmatism [10] and other aberrations [11] of correcting human eye.
Claims (3)
1. design based on the cornea ablation mode of personalized human-eye model comprises structure and the calculating of cornea, crystalline lens and full aberration and MTF.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 design of described cornea ablation mode based on personalized human-eye model according to right 1, it is characterized in that:, can obtain lenticular type and MTF by the optimal design of Zemax software.
3. require the design of described cornea ablation mode based on personalized human-eye model according to right 1, it is characterized in that: according to the association between aberration and the contrast sensitivity function CSF, can obtain personalized visual function, correct out of focus, astigmatism and other aberrations, thereby obtain optimized visual quality.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467612A (en) * | 2010-11-18 | 2012-05-23 | 沈阳理工大学 | Method for constructing individual eye optical model |
| CN110960349A (en) * | 2019-12-12 | 2020-04-07 | 朱登峰 | Method for predicting diopter adjustment value in SMILE refractive surgery |
| CN114748242A (en) * | 2022-04-13 | 2022-07-15 | 南开大学 | Cornea ablation design method and device for wavefront-guided refractive surgery |
-
2008
- 2008-09-10 CN CN200810151282A patent/CN101669850A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467612A (en) * | 2010-11-18 | 2012-05-23 | 沈阳理工大学 | Method for constructing individual eye optical model |
| CN110960349A (en) * | 2019-12-12 | 2020-04-07 | 朱登峰 | Method for predicting diopter adjustment value in SMILE refractive surgery |
| CN110960349B (en) * | 2019-12-12 | 2024-06-18 | 朱登峰 | Prediction method for diopter adjustment value of SMILE refractive surgery |
| CN114748242A (en) * | 2022-04-13 | 2022-07-15 | 南开大学 | Cornea ablation design method and device for wavefront-guided refractive surgery |
| CN114748242B (en) * | 2022-04-13 | 2023-01-10 | 南开大学 | Corneal ablation design method and device for wavefront-guided refractive surgery |
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Application publication date: 20100317 |