Multi-area contact lens with property of controlling progression of myopia and application method of multi-area contact lens

A contact lens and application method technology, applied in the field of vision correction, can solve the problems of photophobia, lack of a clear relationship and increase in the size of the defocus around the human eye of the contact lens, and achieve the effect of reducing the difficulty of processing

Inactive Publication Date: 2019-03-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain shortcomings and side effects, such as photophobia, decreased adjustment, wearing discomfort, infection risk and dizziness.
[0004] The Hong Kong Polytechnic University proposed a CooperVision MiSight bifocal contact lens, which has been commercialized at present. It has been proved to have the performance of controlling the progression of myopia, but the peripheral myopic defocus provided by the contact lens is only 2D. Clinical studies have shown that a larger peripheral Myopic defocus can control the progression of myopia more effectively, but the peripheral myopic defocus provided by the existing contact lens design basically does not exceed 4D, which still needs to be increased
In addition, there is a lack of a clear relationship between the design parameters of contact lenses and the amount of defocus in the periphery of the human eye

Method used

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  • Multi-area contact lens with property of controlling progression of myopia and application method of multi-area contact lens
  • Multi-area contact lens with property of controlling progression of myopia and application method of multi-area contact lens
  • Multi-area contact lens with property of controlling progression of myopia and application method of multi-area contact lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The Atchison human eye model was established in the Zemax software, and its structural parameters are shown in Table 1. The myopic human eye model of SR=-3D is selected, then rc=7.704; vl=17.177; rx=-12.628, Qx=0.192; ry=-12.732, Qy=0.199. On the basis of this eye model, the optimal design and performance analysis of the contact lens is carried out. The lens body uses the silicone hydrogel material Balaficon A with a refractive index of 1.422.

[0035] Table 1 Structural parameters of Atchison's eye model

[0036]

[0037]

[0038] rc=7.77+0.022SR.

[0039] GradA=1.371+0.0652778Z-0.0226659Z2-0.0020399(X 2 +Y 2 ).

[0040] GradP=1.418-0.0100737Z2-0.0020399 (X 2 +Y 2 ).

[0041] vl=16.28-0.299SR.

[0042] rx=-12.91-0.094SR, Qx=0.27+0.026SR.

[0043] ry=-12.72+0.004SR, Qy=0.25+0.017SR.

[0044] Aperturetype: floatbystopsize.

[0045] according to figure 1 , 2 As shown in , 3, the present embodiment proposes a multi-zone contact lens capable of controlling ...

Embodiment 2

[0064] With reference to the design method in Example 1, only the size of the partition of the glasses body is changed, and the additional diopter of the second treatment area is increased,

[0065] according to figure 1 , 4 As shown in . The myopia correction zone 1 is an area that can completely correct myopia vision, the myopia treatment zone 2 is an area that can produce myopic defocus along the peripheral retina, and the front surface of the glasses body is rotationally symmetrical The multi-region aspheric / spherical surface type, and the front surface of the glasses body of the rotationally symmetrical multi-region aspheric / spherical surface type is divided by 5 radial coordinates A 1 、A 2 、A 3 、A 4 and A 5 Divided into five concentric radial areas, the five concentric radial areas are the first area, the second area, the third area, the fourth area and the fifth area from the inside to the outside, and the first area is myopia Correction area 1, the second area, ...

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Abstract

The invention provides a multi-area contact lens with a property of controlling progression of myopia and an application method of the multi-area contact lens. The multi-area contact lens comprises alens body, wherein the lens body comprises a myopia correction area, a myopia treatment area and a connection area for fixing wearing of the contact lens, the myopia correction area is an area capableof completely correcting myopia vision, and the myopia treatment area is an area capable of generating myopic defocusing along the peripheral retina. The multi-area contact lens with the property ofcontrolling the progression of the myopia and the application method of the multi-area contact lens have the advantages that the front surface of the lens body is provided with rotationally symmetrical multi-area aspheric surface/ spherical surface profiles so that the use of the aspheric surface can be avoided, thereby reducing the processing difficulty, surface profile parameters of all areas onthe front surface of the lens body can be adjusted flexibly, and by adjusting the size of the area and size of additional refractive power of all the areas of the lens body, the correction ability ofthe central vision and the size of provided peripheral myopic defocusing can be effectively adjusted, thereby being capable of providing personalized customization according to different individual needs.

Description

technical field [0001] The invention relates to the technical field of vision correction, in particular to a multi-region contact lens capable of controlling the progression of myopia and an application method thereof. Background technique [0002] Myopia is by far the most common refractive error among children and adolescents in most parts of the world. In addition, the age of onset of myopia is getting younger in many countries, and an earlier age of onset may accelerate the progression of myopia, which in turn increases the severity of myopia and increases the risk of related eye diseases such as cataracts, glaucoma, retinal degeneration, etc. risk. The design of contact lenses with the ability to control the progression of myopia is expected to slow down the progression of myopia in children and adolescents, and has potential application value. [0003] The current methods of controlling the progression of myopia mainly include atropine, orthokeratology lenses, bifoca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/04G02C7/02
Inventor 刘永基边亚燕
Owner NANKAI UNIV
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