CN104298815A - Reverse construction method for human eye average model - Google Patents
Reverse construction method for human eye average model Download PDFInfo
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- CN104298815A CN104298815A CN201410491589.XA CN201410491589A CN104298815A CN 104298815 A CN104298815 A CN 104298815A CN 201410491589 A CN201410491589 A CN 201410491589A CN 104298815 A CN104298815 A CN 104298815A
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Abstract
The invention discloses a reverse construction method for a human eye average model. Based on flat curvature radius values, steep curvature radius values and quadric surface coefficients of the front surface and the rear surface of a measured human cornea facial contour and intraocular intervals, through the combination of a cornea facial contour model, a crystalline lens graduated refractive index model and an intraocular medium chromatic dispersion model, a model of a crystalline lens is set to be an unknown quantity, an evaluation function is established, the unknown quantity is acquired through iterative optimization approach in optical design, and then the human eye model with aberration meeting the practical situation is acquired. Based on the human eyes in China, the process is simple, the recurrence accuracy of the measured human eye aberration is improved, and an optimum solution of the crystalline lens is acquired.
Description
Technical field
The present invention relates to visual optics and ophthalmic art field, particularly a kind of reverse construction method of human eye averaging model.
Background technology
Say from optical angle, eyeball is a typical Image-forming instrument, a complex optics, its principal ingredient is respectively from outside to inside: cornea, aqueous humor, pupil, crystalline lens, vitreum and retina, and each interface before from cornea to eye ground is all the ingredient of this complex optics.Although each interface has complicated geometric properties and optical characteristics, but for different objects, human eye has much common feature, as all roughly the same in the refractive index of each medium, the curvature of each plane of refraction etc., therefore can represent general human eye with a relatively simple statistical eye model.
The object of eye of designing a model is applicable to carry out eyeball optics systems theory research and the optical texture can simulating eyes imaging state to set up one.Based on Physiological Anatomy data, in conjunction with the experimental result of the measurement means such as optic test, optical model is set up to human eye, study the optical signature at each interface, can not only contribute to understanding the imaging on the refractive status of each medium of intraocular and whole eyeball and retina, and have important using value at the clinicing aspect of ophthalmology.Human eye averaging model be structured in living eyes aberration correction, artificial lens design aspect has very important effect.The structure of current human-eye model is all based on external human eye, and process is slightly aobvious complicated and to survey the precision of human eye pixel not high.
Summary of the invention
Technical matters to be solved by this invention be overcome prior art defect and a kind of reverse construction method of human eye averaging model is provided, the present invention is based on the eye cornea of actual measurement, intraocular spacing and aberration statistical analyses result, in conjunction with canthus face pattern type, crystalline lens graded index model and ocular media dispersive model, by setting up evaluation function, reappearing actual measurement human eye aberration is target, and iteration optimization obtains human eye averaging model.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
According to the reverse construction method of a kind of human eye averaging model that the present invention proposes, comprise the following steps:
The initial configuration of step one, structure human eye averaging model;
A, the flat radius-of-curvature recording the front and rear surfaces of canthus face type, precipitous radius-of-curvature value and quadric surface coefficient, set up the model of canthus face type;
B, record spacing between ocular media, call each medium refraction rate database of intraocular based on Conrady dispersion equation, and set up ocular media dispersive model;
C, set up crystalline lens graded index model, adopt double cubic surface as crystalline honorable type, crystalline lens graded index model is called in Zemax optical design software;
Model, ocular media dispersive model, the crystalline lens graded index model of the above cornea face type set up of d, basis, adopt Zemax optical design software to build the initial configuration of human eye averaging model;
The Zernike coefficient of step 2, measurement human eye aberration, adopts the Zernike Standard Phase face type in Zemax optical design software to represent the phase plane of reflection aberration in the entrance pupil position of opthalmic optics's system;
Step 3, set up evaluation function, average after measuring the human eye parameter of n people, this mean value is set to variable as the parameter of the initial configuration of structure human eye averaging model, crystalline honorable type is set to variable, based on damped least square method, by asking the minimal value solution of evaluation function, to minimize the wave aberration RMS of whole opthalmic optics's system of the phase plane comprising reflection aberration for target, be optimized; N be greater than or equal to 2 integer;
After step 4, optimization terminate, obtain crystalline honorable pattern type, and then obtain human eye averaging model.
As the scheme of the further optimization of the reverse construction method of a kind of human eye averaging model of the present invention, in described a, the flat radius-of-curvature of the front and rear surfaces of canthus face type, precipitous radius-of-curvature value and quadric surface coefficient adopt anterior ocular segment analysis and diagnosis system to record.
As the scheme of the further optimization of the reverse construction method of a kind of human eye averaging model of the present invention, in described b, the spacing between ocular media adopts diasonograph to record.
As the scheme of the further optimization of the reverse construction method of a kind of human eye averaging model of the present invention, in described step 2, the Zernike coefficient of human eye aberration is measured by Shack-Hartmann wavefront analyzer.
As the scheme of the further optimization of the reverse construction method of a kind of human eye averaging model of the present invention, the human eye parameter in described step 3 comprises the spacing between canthus face type, ocular media.
The present invention adopts above technical scheme compared with prior art, there is following technique effect: the present invention is based on the eye cornea of actual measurement, intraocular spacing and aberration statistical analyses result, in conjunction with canthus face pattern type, crystalline lens graded index model and ocular media dispersive model, by setting up evaluation function, reappearing actual measurement human eye aberration is target, and iteration optimization obtains human eye averaging model.Process of the present invention simple and easy and improve actual measurement human eye aberration fidelity, obtain lenticular optimum solution.
Accompanying drawing explanation
Fig. 1 is the reverse construction method schematic diagram of human eye averaging model of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, be the reverse construction method schematic diagram of human eye averaging model of the present invention.A reverse construction method for human eye averaging model, comprises the following steps:
The initial configuration of step one, structure human eye averaging model;
A, the flat radius-of-curvature recording the front and rear surfaces of canthus face type, precipitous radius-of-curvature value and quadric surface coefficient, set up the model of canthus face type;
B, record spacing between ocular media, call each medium refraction rate database of intraocular based on Conrady dispersion equation, and set up ocular media dispersive model;
C, set up crystalline lens graded index model, adopt double cubic surface as crystalline honorable type, crystalline lens graded index model is called in Zemax optical design software;
Model, ocular media dispersive model, the crystalline lens graded index model of the above cornea face type set up of d, basis, adopt Zemax optical design software to build the initial configuration of human eye averaging model;
Step 2, measure the Zernike coefficient of human eye aberration, adopt the Zernike Standard Phase(Ze Nike normalized phase in Zemax optical design software in the entrance pupil position of opthalmic optics's system) face type represents the phase plane of reflection aberration;
Step 3, set up evaluation function, average after measuring the human eye parameter of n people, this mean value is set to variable as the parameter of the initial configuration of structure human eye averaging model, in evaluation function, the fiducial interval of these parameters presets, crystalline honorable type is set to variable, based on damped least square method, by asking the minimal value solution of evaluation function, to minimize the wave aberration RMS of whole opthalmic optics's system of the phase plane comprising reflection aberration for target, be optimized; N be greater than or equal to 2 integer;
After step 4, optimization terminate, obtain crystalline honorable pattern type, and then obtain human eye averaging model.
In described step 2, the Zernike coefficient of human eye aberration is measured by Shack-Hartmann wavefront analyzer.Application Shack-Hartmann wavefront analyzer measures human eye aberration, and introduces the phase plane of reflection actual measurement human eye aberration.In conjunction with canthus face pattern type, crystalline lens graded index model and ocular media dispersive model, by setting up evaluation function, reappearing actual measurement human eye aberration is target, and iteration optimization tries to achieve lenticular equivalent optical model.The system model that application Zemax finally sets up is human eye averaging model.In described a, the flat radius-of-curvature of the front and rear surfaces of canthus face type, precipitous radius-of-curvature value and quadric surface coefficient adopt anterior ocular segment analysis and diagnosis system to record.In described b, the spacing between ocular media adopts diasonograph to record.In described step 2, the Zernike coefficient of human eye aberration is measured by Shack-Hartmann wavefront analyzer.Human eye parameter in described step 3 comprises the spacing between canthus face type, ocular media.
The present invention is based on the eye cornea of actual measurement, intraocular spacing and aberration statistical analyses result, in conjunction with canthus face pattern type, crystalline lens graded index model and ocular media dispersive model, by setting up evaluation function, reappearing actual measurement human eye aberration is target, and iteration optimization obtains human eye averaging model.Application Zemax finally sets up human eye averaging model.Existing average human eye model is all set up based on external human eye, and human eye averaging model of the present invention has China's human eye feature, is conducive to the independent research of all kinds of modern ophthalmological instrument of China.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deductions can also be made or substitute, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. a reverse construction method for human eye averaging model, is characterized in that, comprise the following steps:
The initial configuration of step one, structure human eye averaging model;
A, the flat radius-of-curvature recording the front and rear surfaces of canthus face type, precipitous radius-of-curvature value and quadric surface coefficient, set up the model of canthus face type;
B, record spacing between ocular media, call each medium refraction rate database of intraocular based on Conrady dispersion equation, and set up ocular media dispersive model;
C, set up crystalline lens graded index model, adopt double cubic surface as crystalline honorable type, crystalline lens graded index model is called in Zemax optical design software;
Model, ocular media dispersive model, the crystalline lens graded index model of the above cornea face type set up of d, basis, adopt Zemax optical design software to build the initial configuration of human eye averaging model;
The Zernike coefficient of step 2, measurement human eye aberration, adopts the Zernike Standard Phase face type in Zemax optical design software to represent the phase plane of reflection aberration in the entrance pupil position of opthalmic optics's system;
Step 3, set up evaluation function, average after measuring the human eye parameter of n people, this mean value is set to variable as the parameter of the initial configuration of structure human eye averaging model, crystalline honorable type is set to variable, based on damped least square method, by asking the minimal value solution of evaluation function, to minimize the wave aberration RMS of whole opthalmic optics's system of the phase plane comprising reflection aberration for target, be optimized; N be greater than or equal to 2 integer;
After step 4, optimization terminate, obtain crystalline honorable pattern type, and then obtain human eye averaging model.
2. the reverse construction method of a kind of human eye averaging model according to claim 1, it is characterized in that, in described a, the flat radius-of-curvature of the front and rear surfaces of canthus face type, precipitous radius-of-curvature value and quadric surface coefficient adopt anterior ocular segment analysis and diagnosis system to record.
3. the reverse construction method of a kind of human eye averaging model according to claim 1, is characterized in that, in described b, the spacing between ocular media adopts diasonograph to record.
4. the reverse construction method of a kind of human eye averaging model according to claim 1, is characterized in that, in described step 2, the Zernike coefficient of human eye aberration is measured by Shack-Hartmann wavefront analyzer.
5. the reverse construction method of a kind of human eye averaging model according to claim 1, is characterized in that, the human eye parameter in described step 3 comprises the spacing between canthus face type, ocular media.
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Cited By (2)
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| CN109241680A (en) * | 2018-10-30 | 2019-01-18 | 南昌航空大学 | Human eye biomethanics analogy method under state of weightlessness based on finite element |
| CN113197543A (en) * | 2021-05-06 | 2021-08-03 | 南开大学 | Method and system for evaluating vision quality after refractive surgery based on vector aberration theory |
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| CN101069636A (en) * | 2006-05-09 | 2007-11-14 | 南开大学 | Cornea cutting depth calculation based on personalized human eye model |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109241680A (en) * | 2018-10-30 | 2019-01-18 | 南昌航空大学 | Human eye biomethanics analogy method under state of weightlessness based on finite element |
| CN109241680B (en) * | 2018-10-30 | 2022-03-25 | 南昌航空大学 | Finite element-based human eye biomechanics simulation method in weightless state |
| CN113197543A (en) * | 2021-05-06 | 2021-08-03 | 南开大学 | Method and system for evaluating vision quality after refractive surgery based on vector aberration theory |
| CN113197543B (en) * | 2021-05-06 | 2023-02-28 | 南开大学 | Method and system for evaluating vision quality after refractive surgery based on vector aberration theory |
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Application publication date: 20150121 |