CN206725873U - A kind of hard corneal contact lens - Google Patents
A kind of hard corneal contact lens Download PDFInfo
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- CN206725873U CN206725873U CN201720260688.6U CN201720260688U CN206725873U CN 206725873 U CN206725873 U CN 206725873U CN 201720260688 U CN201720260688 U CN 201720260688U CN 206725873 U CN206725873 U CN 206725873U
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Abstract
It the utility model is related to a kind of hard corneal contact lens, including anterior optical surface region and rear surface optical region, anterior optical surface region includes preceding face center region and positioned at the defocus region of preceding face center area peripheral edge, preceding face center region is sphere, the radius of curvature in defocus region constantly reduces since the outside in preceding face center region, and the minimum profile curvature radius in defocus region is 95% the 50% of preceding face center region radius of curvature.Due to the structure of human eye, human eye has an other central distance vision defocus phenomenon, i.e., the picture point in the centre of one picture is just in the macular region of retina, and the picture of neighboring area falls at the rear of retina.There is experiment to prove that other central distance vision defocus is a major reason of myopia progression, reducing other central distance vision defocus contributes to the control of myopia.The utility model design is more than middle section due to the refractive power of lens periphery, it is possible to reduces other central distance vision defocus, and then produces near-sighted control action.
Description
Technical field
It the utility model is related to a kind of hard corneal contact lens.
Background technology
Hard corneal contact lens is the conventional eyeglass that A nearsighted person corrects defects of vision, the preceding surface of existing hard corneal contact lens
Optical region (eyeglass center 6mm-8mm regions) be all sphere, radius of curvature is consistent, that is, single-focusing eyeglass.And
From optometry angle, there is other central distance vision defocus phenomenon in human eye, i.e., same object is imaged on the retina, object center
Picture point falls in retinal centre region, but the picture point of object peripheral part fall it is remote at the rear of retina, i.e., so-called other center
Depending on property defocus.This phenomenon is also proved to be the major reason of myopia progression.Reduce the hair that this phenomenon can slows down myopia
Exhibition.The user of existing single focus lens can cause myopia progression because of other central distance vision defocus.
Utility model content
The utility model provides a kind of hard corneal contact lens, with solve the user of existing hard corneal contact lens understand because
Other central distance vision defocus causes the technical problem of myopia progression.
In order to solve the above technical problems, the utility model adopts the technical scheme that：
A kind of hard corneal contact lens, including anterior optical surface region and rear surface optical region, it is characterized in that：Before described
Surface optical region includes preceding face center region and positioned at the defocus region of the preceding face center area peripheral edge, the preceding table
Face middle section is sphere, and the radius of curvature in the defocus region constantly subtracts since the outside in the preceding face center region
Small, the minimum profile curvature radius in the defocus region is the 95%-50% of the preceding face center region radius of curvature.
Surface optical region includes rear face center region and positioned at the anti-of the rear face center area peripheral edge after described
Turn region, it is described after face center region be sphere, the radius of curvature of the inversion region is from the face center region afterwards
Outside starts constantly to reduce, and the minimum profile curvature radius of the inversion region is the rear face center region radius of curvature
98%-80%.
The preceding face center region radius of curvature is 5.0mm-30.0mm, the preceding face center region project plane
Radius is 1.0mm-3.0mm, and the rear face center region radius of curvature is 5.0mm-30.0mm, the rear face center region
The radius of projection plane is 2.0mm-6.0mm
The defocus region is to the region away from center of lens 4.0mm, institute since the preceding face center edges of regions
State the annulus that inversion region is the 1.0mm-4.0mm outside the rear face center region.
After above-mentioned technical proposal is employed, because anterior optical surface region includes preceding face center region and positioned at preceding table
The defocus region on face middle section periphery, preceding face center region are sphere, and the radius of curvature in defocus region is from preceding face center
The outside in region starts constantly to reduce, and the minimum profile curvature radius in defocus region is the 95%- of preceding face center region radius of curvature
50%, so same object is imaged on the retina, the picture point in object center falls in retinal centre region, object peripheral part
Picture point there is Myopia drift, solve existing hard corneal contact lens and do not reduce the technology of other central distance vision defocus and ask
Topic.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model specific embodiment one.
In figure, 1 is preceding face center region, and 2 be defocus region, and 3 be rear face center region, and 4 be inversion region.
Embodiment
Specific embodiment one
As shown in figure 1, a kind of hard corneal contact lens, including anterior optical surface region and rear surface optical region, preceding table
Face optical region includes preceding face center region and positioned at the defocus region of preceding face center area peripheral edge, preceding face center region
For sphere, the radius of curvature in defocus region constantly reduces since the outside in preceding face center region, the most Chinese yeast in defocus region
Rate radius is the 95%-50% of preceding face center region radius of curvature, rear surface optical region include rear face center region and
Positioned at the inversion region of rear face center area peripheral edge, rear face center region is sphere, and the radius of curvature of inversion region is from rear
The outside in face center region starts constantly to reduce, and the minimum profile curvature radius of inversion region is rear face center region radius of curvature
98%-80%, preceding face center region radius of curvature is 5.0mm-30.0mm, the radius of preceding face center region project plane
For 1.0mm-3.0mm, rear face center region radius of curvature is 5.0mm-30.0mm, the half of rear face center region project plane
Footpath is 2.0mm-6.0mm.Defocus region is to the region away from center of lens 4.0mm, instead since preceding face center edges of regions
Turn an annulus of the region for the 1.0mm-4.0mm outside rear face center region.Same object is imaged on the retina, in object
The picture point of centre falls there is Myopia drift in retinal centre region, the picture point of object peripheral part, solves existing rigid angle
Film contact lense does not reduce the technical problem of other central distance vision defocus.
Claims (3)
1. a kind of hard corneal contact lens, including anterior optical surface region and rear surface optical region, it is characterized in that：The preceding table
Face optical region includes preceding face center region and positioned at the defocus region of the preceding face center area peripheral edge, the preceding surface
Middle section is sphere, and the radius of curvature in the defocus region constantly reduces since the outside in the preceding face center region,
The minimum profile curvature radius in the defocus region is the 95%-50% of the preceding face center region radius of curvature, the rear surface
Optical region includes rear face center region and in the inversion region of the rear face center area peripheral edge, the rear surface
Centre region is sphere, and the radius of curvature of the inversion region constantly reduces since the outside in the rear face center region, institute
The minimum profile curvature radius for stating inversion region is the 98%-80% of the rear face center region radius of curvature.
2. hard corneal contact lens as claimed in claim 1, it is characterized in that：The preceding face center region radius of curvature is
5.0mm-30.0mm, the radius of the preceding face center region project plane is 1.0mm-3.0mm, the rear face center region
Radius of curvature is 5.0mm-30.0mm, and the radius of the rear face center region project plane is 2.0mm-6.0mm.
3. hard corneal contact lens as claimed in claim 2, it is characterized in that：The defocus region is from the preceding face center
It is outside the rear face center region that edges of regions, which starts to the region away from center of lens 4.0mm, the inversion region,
A 1.0mm-4.0mm annulus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720260688.6U CN206725873U (en) | 2017-03-17 | 2017-03-17 | A kind of hard corneal contact lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720260688.6U CN206725873U (en) | 2017-03-17 | 2017-03-17 | A kind of hard corneal contact lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206725873U true CN206725873U (en) | 2017-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720260688.6U Active CN206725873U (en) | 2017-03-17 | 2017-03-17 | A kind of hard corneal contact lens |
Country Status (1)
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| CN (1) | CN206725873U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773121A (en) * | 2017-03-17 | 2017-05-31 | 施伯彦 | A kind of hard corneal contact lens |
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2017
- 2017-03-17 CN CN201720260688.6U patent/CN206725873U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773121A (en) * | 2017-03-17 | 2017-05-31 | 施伯彦 | A kind of hard corneal contact lens |
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