Design method for cornea contact lens based on wave front technology

A corneal contact lens and corneal contact technology, which is applied in the field of vision correction, can solve the problems that the accuracy is affected by subjective factors, the contact lens optometry process is complicated, and the optometry result is not accurate enough.

Inactive Publication Date: 2011-07-20
NANKAI UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems that the existing contact lens optometry process is complicated, the optometry result is not accurate enough and the accuracy is affected by subjective factors, and to provide a contact lens design method based on wavefront technology, so as to design contact lens based on objective measurement data. Optimal contact lenses to improve the visual quality of the human eye

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  • Design method for cornea contact lens based on wave front technology
  • Design method for cornea contact lens based on wave front technology
  • Design method for cornea contact lens based on wave front technology

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Embodiment

[0062] Table 1 shows the corneal topography characteristic parameters of two test eyes measured by Orbscan Ⅱ corneal topography instrument, where R is the reference spherical radius given by the corneal topography instrument, and the corneal topography is expressed by Zernike polynomial. Table 1 lists 3rd(α c 3 ) - Item 9 (α c 9 ) coefficients of Zernike polynomials.

[0063] Table 1 The characteristic parameters of corneal surface shape of two tested eyes

[0064]

[0065] Table 2 shows the fitted surface and its characteristic parameters according to the characteristic parameters of the corneal surface. Where R' (mm) is the radius of curvature of the best fitting sphere, P' is the best fitting sphericity, R1 and R2 refer to the radius of curvature of the best fitting toroidal surface along the x-axis and y-axis direction (mm ), P1 and P2 are the diopters (D) in the corresponding direction, is the corneal astigmatism (D), and the meaning of θ angle (°) is the same a...

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Abstract

The invention provides a design method for a cornea contact lens based on a wave front technology. The method is a technology for obtaining a surface type structure of the cornea contact lens according to an objective measurement data of eye vision light; according to actually measured corneal topography data, optimum spherical or circular fitting is processed for the cornea front surface by MATLAB software programming to design the surface type structure of an optical region on the back surface of the cornea contact lens. The spreading of the wave front that is transmitted to the cornea front surface from the exit pupil plane through a tear lens and a cornea contact lens medium is calculated according to the actually measured wave front aberration data of human eyes based on a diffractive angular spectrum theory so as to obtain the equivalent wave front aberration of the front surface of the cornea contact lens and then fit to figure out the optimum curved surface type of the optical region on the front surface of the cornea contact lens for correcting the wave front aberration of eye; and the optimum sphericity, column degree and parallactic angle of an astigmatism axis of the cornea contact lens are figured out for the cornea contact lens by calculating and fitting the designed surface type structures for optical region on the front and back surfaces of the cornea contact lens.

Description

technical field [0001] The invention belongs to the technical field of vision correction. Background technique [0002] Contact lenses have been around for more than a hundred years, and the development of modern high-tech has provided more ways for the research of contact lenses, such as the improvement of manufacturing process and materials, the personalization of fitting and design, etc., making corneal contact lenses Lenses are favored by more and more eye patients. [0003] At present, the diopter of contact lenses required to correct ametropia is obtained by the following optometry procedure: based on the basic diopter measured by objective computer refractometer and manual retinoscopy, combined with the corneal curvature radius obtained by keratometer, select a certain Standard try-in lenses are used for subjective optometry, and the test results obtained are based on the diopter of the frame glasses plane as the reference plane. Finally, it is converted into a conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/04G02B27/00
Inventor 王肇圻李蕊饶丰张振华
Owner NANKAI UNIV
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