CN110275316B - A multifunctional hard corneal contact lens - Google Patents
A multifunctional hard corneal contact lens Download PDFInfo
- Publication number
- CN110275316B CN110275316B CN201910591509.0A CN201910591509A CN110275316B CN 110275316 B CN110275316 B CN 110275316B CN 201910591509 A CN201910591509 A CN 201910591509A CN 110275316 B CN110275316 B CN 110275316B
- Authority
- CN
- China
- Prior art keywords
- zone
- lens
- positioning
- defocus
- luminosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
- G02C7/044—Annular configuration, e.g. pupil tuned
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Abstract
本发明提供一种多功能硬性角膜接触镜，包括镜体，所述镜体从中心向外依次设置有光学区、离焦区、定位区和周边弧区，通过设计泪液层的光度、定位区最大曲率以及相对光度，在满足近视离焦设计的同时，更好的兼顾不规则角膜的验配，改善现有RGP在高度近视应用中的边缘舒适感，提高镜片的普适性。
The present invention provides a multifunctional hard corneal contact lens, comprising a lens body, wherein the lens body is sequentially provided with an optical zone, a defocus zone, a positioning zone and a peripheral arc zone from the center outward, and by designing the luminosity of the tear layer, the maximum curvature of the positioning zone and the relative luminosity, while satisfying the myopia defocus design, better consideration is given to the fitting of irregular corneas, the edge comfort of the existing RGP in high myopia applications is improved, and the universality of the lens is improved.
Description
Technical Field
The invention relates to the technical field of contact lenses for correcting eyesight of glasses, in particular to a multifunctional hard cornea contact lens.
Background
The existing hard cornea contact lens is good news for high-degree patients, but as the degree of myopia increases, the thickness of the edge of the lens also increases obviously, so that the comfortable experience of a wearer is reduced due to too thick edge, and even the situation that the wearer cannot wear the lens adaptively and cannot wear the lens continuously can occur.
The existing positioning design of the peripheral area in the hard cornea contact lens can only be applicable to one cornea form, and the universality is limited.
In addition, in order to better control myopia progression, peripheral vision must be compromised while correcting myopia to ensure central macular vision of the retina, according to peripheral retinal defocus theory. Irregular cornea is often accompanied by irregular astigmatism, and the test and matching of the irregular cornea is high compared with that of a conventional cornea.
Disclosure of Invention
The invention provides a hard cornea contact lens capable of improving the edge comfort of a high-myopia lens body.
In order to solve the technical problems, the invention adopts the following technical scheme:
a multifunctional hard cornea contact lens comprises a lens body, wherein an optical zone, a defocusing zone, a positioning zone and a peripheral arc zone are sequentially formed on the lens body from the center to the outside;
the luminosity D tear of the tear fluid layer formed between the lens body and the cornea of the patient meets the following formula:
Dtear＝Dcentre*0.25
Where r 2 is the radius of curvature of the optical zone of the rear surface of the mirror, r c is the central radius of curvature of the front surface of the mirror, and r 2>rc,Dcentre is the luminosity of the optical zone of the mirror.
Further, in order to consider the fitting of irregular cornea and improve the universality of the lens, the maximum curvature difference delta between the initial point of the positioning area close to the defocus area and the end point of the positioning area close to the peripheral arc area is taken as a variable adjustment factor, and the following formula is satisfied:
Wherein y 1 is the y-axis coordinate of the starting point of the positioning region, y 2 is the y-axis coordinate of the ending point of the positioning region, y 1 'is the first-order bias of y 1, y 2' is the first-order bias of y 2, y 1 "is the second-order bias of y 1, y 2" is the second-order bias of y 2, R is the starting radius of curvature of the positioning region, e is the eccentricity, and W is the radius from the ending point of the positioning region to the center line.
Further, in order to meet the design of myopia defocus, the situation of overcorrection of the periphery of the retina is avoided, and the relative luminosity D defocus＝Dperiphery-Dcentre >0 of the lens body is avoided, wherein D periphery is the luminosity of the defocus region, and D centre is the luminosity of the optical region of the lens body.
According to the technical scheme, the luminosity of the tear liquid layer, the maximum curvature of the positioning area and the relative luminosity are designed, so that the design of myopia defocus is met, meanwhile, the test and the matching of irregular cornea are better considered, the edge comfort of the existing RGP in high myopia application is improved, and the universality of the lens is improved.
Drawings
FIG. 1 is a schematic view of the structure of a hard contact lens of the present invention;
FIG. 2 is a schematic view of a lens in contact with the cornea and showing the tear layer;
FIG. 3 is a graph of a conventional lens power distribution;
FIG. 4 is a graph of luminance value distribution of the optical zone and the defocus zone;
fig. 5 is a schematic view of object imaging of a mirror.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the multifunctional hard contact lens comprises a lens body 1, wherein an optical zone 2, a defocusing zone 3, a positioning zone 4 and a peripheral arc zone 5 are sequentially formed from the center to the outside of the lens body. The concave surface of the mirror body is called the rear surface, and the convex surface of the mirror body is called the front surface.
The more myopic the patient, the flatter the anterior surface of the lens, and the thicker the edge of the lens is machined. This optical law, which is present not only in the manufacture of contact lenses, but also in the prescription of frame lenses, often reduces the thickness of the edges of the lenses by changing the refractive index of the lenses when they are worn, but the contact lenses are limited in material and therefore limit the choice of refractive index. According to this optical law, the processed lens edge can be made thinner as long as the processing power of the lens can be reduced. The contact lens is worn on the eyeball, besides the lens itself provides corrective diopter, a tear layer 6 (refer to fig. 2) is formed between the lens body 1 and the cornea 7 of the patient, and the tear layer formed by the design of the invention can share partial luminosity, so that the luminosity of the lens body is reduced, and the purpose of thinning the edge is realized.
The luminosity D tear of the tear layer 6 satisfies the following formula:
Dtear＝Dcentre*0.25
Where r 2 is the radius of curvature of the optical zone of the rear surface of the mirror, r c is the central radius of curvature of the front surface of the mirror, and r 2>rc,Dcentre is the luminosity of the optical zone of the mirror. D centre is determined by the front and back surfaces of the lens and the center thickness, i.e., a complete parameter of the lens body, without distinguishing between the front and back surfaces.
R 2>rc; and is also provided withThis flatter optical zone design, applied to an irregularly shaped cornea patient, helps to improve its irregular astigmatism while the positioning arc allows for better lens positioning, greatly simplifying the prescription of the previous irregular cornea. The following table shows the comparison of the edge thickness of the lens of the present invention with conventional designs for different corneal central curvatures K and different myopia:
Since D centre and r c are objective data of patients, the edge of the mirror body designed in the way is thinned by about 20% compared with the prior conventional design.
In order to consider the irregular cornea fitting and improve the universality of the lens, the maximum curvature difference delta between the initial point of the positioning area close to the defocus area and the end point of the positioning area close to the peripheral arc area of the positioning area 4 is taken as a variable adjustment factor, and the following formula is satisfied:
Wherein y 1 is the y-axis coordinate of the starting point of the positioning region, y 2 is the y-axis coordinate of the ending point of the positioning region, y 1 'is the first-order bias of y 1, y 2' is the first-order bias of y 2, y 1 "is the second-order bias of y 1, y 2" is the second-order bias of y 2, R is the starting radius of curvature of the positioning region, e is the eccentricity, and W is the radius from the ending point of the positioning region to the center line.
The morphology of the peripheral region in the cornea varies greatly, and even if the morphology of the central region is the same, the morphology of the peripheral region may be completely different. To solve this problem, the present invention satisfies the change in the middle circumference of the cornea by adding a variable adjustment factor. The adjusting factor is the maximum curvature difference delta between the initial position and the end of the positioning area, according to Qu Lvcha, we can reversely calculate the eccentricity e value of the lens, and the larger the e value is, the faster the curvature radius change of each point of the positioning arc is.
The specific deduction process of the formula is as follows:
The general equation for the secondary aspheric is:
the first order partial derivative is obtained by solving the following steps:
similarly, a second order bias derivative y' is calculated; the formula defined according to the curvature is:
Maximum curvature difference Wherein R is the curvature radius value of the locating area near the locating area starting point of the defocusing area, K 2 and K 1 are the curvature radius values of the locating area ending point and the locating area starting point, the three values are obtained by measuring the curvature radius value of the cornea locating arc through a cornea topographic map, W 2 and W 1 are the ending position and the starting position of the locating arc, and the data are also determined according to the specific measurement of the cornea diameter of each person.
Then the equationBelonging to the unitary equation from which the eccentricity e value at the lens positioning arc can be deduced.
Concave lenses are used to correct myopia, so that the more divergent the light is, the less negative the lens, or the higher the patient's myopia.
The relative luminosity D defocus is also called the relative defocus amount, and D defocus＝Dperiphery-Dcentre, where D periphery is the refractive value of the human eye's periphery and D centre is the luminosity of the optic region of the lens body.
If D defocus <0, the light divergence degree in the center of the lens body is larger than that in the periphery;
If D defocus =0, it indicates that the light divergence degree in the center of the lens body is equal to that in the periphery;
If D defocus >0, it is indicated that the light divergence in the center of the mirror is smaller than that in the periphery.
As shown in fig. 3, the conventional lens is characterized by the distance from the center (0) to the periphery of the optical zone of the lens in the horizontal direction, negative values indicate the left side of the center of the lens, and positive values indicate the right side of the center of the lens; the vertical direction indicates the optical zone refractive power distribution of the lens; as can be seen from the example graph analysis, the conventional spherical contact lens has a tendency that the refractive power of the lens outside the central zone (outside 3 mm) becomes smaller when the optical power D of the center is given, that is, the peripheral light of the optical zone of the spherical contact lens diverges more, and if the myopia of the peripheral zone is not so great, there is a possibility that the peripheral of the retina is overcorrected, so that the peripheral of the retina of the patient is in a far-vision defocus state.
The invention divides the original optical distinction of conventional design into two parts: a central optical zone 2 and a defocus zone 3. The diameter of the optical zone 2 is 3mm-6mm, the surface width of the defocusing zone 3 is 1mm-3mm, the surface width of the positioning zone 4 is 0.6mm-1.5mm, the total diameter of the lens body 1 is 9.0mm-11.5mm, and the optical zone, the defocusing zone, the positioning zone and the peripheral arc zone are aspheric.
The relative luminosity of the mirror body is designed to be D defocus＝Dperiphery-Dcentre >0, which is 0.5D-5.0D, where D is the luminosity unit.
As shown in fig. 4, the optical zone 2 of the present invention is of aspheric design, and is capable of forming a suitable eccentricity e value, so that the luminosity is uniform, the relative luminosity of the defocus region with respect to the optical zone is increased, and such a lens is worn on the cornea of a patient in accordance with the degree of myopia, so that the central myopia state is corrected positively, i.e. the object is imaged on the macular region of the retina, and the imaging of the peripheral region falls either on or in front of the periphery of the retina, forming myopia defocus. The optical path is shown in fig. 5, if the patient has myopia of 325 degrees, the contact lens of the invention is worn, the diameter of the optical area is 4mm, the luminosity of the optical area of the lens is-3.25D, the light beam A completely passes through the optical area of the lens body, passes through the eyeball to be focused in the macular area of the retina, the width of the defocusing area is 1.5mm, the luminosity of the periphery of the lens body is 1.75D, the light beams B and C, and the marginal light part passes through the defocusing area of the lens body, passes through the eyeball to be focused in front of the periphery of the retina, so that the peripheral myopia defocusing is formed.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (4)
1. The multifunctional hard cornea contact lens comprises a lens body and is characterized in that an optical zone, a defocusing zone, a positioning zone and a peripheral arc zone are sequentially formed on the lens body from the center to the outside;
the luminosity D tear of the tear fluid layer formed between the lens body and the cornea of the patient meets the following formula:
Dtear＝Dcentre*0.25
Wherein r 2 is the radius of curvature of the optical zone of the rear surface of the mirror body, r c is the central radius of curvature of the front surface of the mirror body, and r 2>rc,Dcentre is the luminosity of the optical zone of the mirror body;
the maximum curvature difference delta of the positioning area from the starting point of the positioning area close to the defocusing area to the ending point of the positioning area close to the peripheral arc area is used as a variable adjustment factor, and the following formula is satisfied:
Wherein y 1 is the y-axis coordinate of the starting point of the positioning region, y 2 is the y-axis coordinate of the ending point of the positioning region, y 1 'is the first-order bias of y 1, y 2' is the first-order bias of y 2, y 1 "is the second-order bias of y 1, y 2" is the second-order bias of y 2, R is the starting curvature radius of the positioning region, e is the eccentricity, W is the radius from the ending point of the positioning region to the central line, and y represents the sagittal height of the lens.
2. The multifunctional hard contact lens of claim 1, wherein the relative power of the lens body, D defocus＝Dperiphery-Dcentre >0, wherein D periphery is the power of the defocus region and D centre is the power of the optical region of the lens body.
3. The multifunctional hard contact lens of claim 2, wherein the relative luminosity is between 0.5D and 5.0D, wherein D is the luminosity unit.
4. The multifunctional hard contact lens of claim 1, wherein the diameter of the optical zone is 3mm-6mm, the surface width of the defocus zone is 1mm-3mm, the surface width of the positioning zone is 0.6mm-1.5mm, the total diameter of the lens body is 9.0mm-11.5mm, and the optical zone, defocus zone, positioning zone and peripheral arc zone are aspheric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591509.0A CN110275316B (en) | 2019-07-02 | 2019-07-02 | A multifunctional hard corneal contact lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591509.0A CN110275316B (en) | 2019-07-02 | 2019-07-02 | A multifunctional hard corneal contact lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110275316A CN110275316A (en) | 2019-09-24 |
| CN110275316B true CN110275316B (en) | 2024-11-22 |
Family
ID=67963909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910591509.0A Active CN110275316B (en) | 2019-07-02 | 2019-07-02 | A multifunctional hard corneal contact lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110275316B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112764240B (en) * | 2019-11-04 | 2022-11-25 | 亨泰光学股份有限公司 | Aspheric lens for controlling eyeball growth rate by E value and manufacturing method thereof |
| TWI799867B (en) * | 2020-01-08 | 2023-04-21 | 星歐光學股份有限公司 | Contact lens and contact lens product |
| TWI731544B (en) * | 2020-01-08 | 2021-06-21 | 星歐光學股份有限公司 | Contact lens and contact lens product |
| CN111856781A (en) * | 2020-08-24 | 2020-10-30 | 深圳威尔视科技有限公司 | Full-lens ring-curved-surface corneal shaping lens |
| CN113238394A (en) * | 2021-05-25 | 2021-08-10 | 萧旭贵 | Full-view-area zoom corneal contact lens |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085315A (en) * | 2017-06-21 | 2017-08-22 | 王桂云 | A kind of concentric circles defocus haptic lens |
| WO2018204395A1 (en) * | 2017-05-01 | 2018-11-08 | Pres-By Vision Ltd. | Dynamic tear lenses |
| CN208270873U (en) * | 2017-04-30 | 2018-12-21 | 欧普康视科技股份有限公司 | A kind of identical property positioning Ortho-K that machinable is realized |
| CN210155447U (en) * | 2019-07-02 | 2020-03-17 | 欧普康视科技股份有限公司 | A multifunctional rigid contact lens |
Family Cites Families (2)
| 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 |
| CN109407341B (en) * | 2018-11-21 | 2023-09-08 | 欧普康视科技股份有限公司 | Hard contact lens for reducing paracentral hyperopia and defocus and manufacturing method thereof |
-
2019
- 2019-07-02 CN CN201910591509.0A patent/CN110275316B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208270873U (en) * | 2017-04-30 | 2018-12-21 | 欧普康视科技股份有限公司 | A kind of identical property positioning Ortho-K that machinable is realized |
| WO2018204395A1 (en) * | 2017-05-01 | 2018-11-08 | Pres-By Vision Ltd. | Dynamic tear lenses |
| CN107085315A (en) * | 2017-06-21 | 2017-08-22 | 王桂云 | A kind of concentric circles defocus haptic lens |
| CN210155447U (en) * | 2019-07-02 | 2020-03-17 | 欧普康视科技股份有限公司 | A multifunctional rigid contact lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110275316A (en) | 2019-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110275316B (en) | A multifunctional hard corneal contact lens | |
| JP4425350B2 (en) | Progressive lens element, design method and use thereof | |
| US7338160B2 (en) | Contact lens with shaped periphery | |
| KR101166623B1 (en) | Method and apparatus for controlling peripheral image position for reducing progression of myopia | |
| KR101627476B1 (en) | Ophthalmic lens element | |
| CN111407465B (en) | High Definition and Extended Depth of Field Intraocular Lenses | |
| JP6474542B2 (en) | Contact lenses with improved fit characteristics | |
| TW201326960A (en) | Method for designing non-round soft contact lenses | |
| KR20130057418A (en) | Contact lenses for myopic eyes and methods of treating myopia | |
| CN116745688A (en) | Spectacle lens design, method for manufacturing a spectacle lens and method for providing a spectacle lens for at least slowing the progression of myopia | |
| JP2010250347A (en) | Progressive spectacle lens with two non-spherical surfaces, more particularly progressive surfaces, and method of calculating the same | |
| WO2019109862A2 (en) | Orthokeratology lens and method for manufacture thereof | |
| JP2019045859A (en) | Atoric surfaces to minimize secondary astigmatism in contact lenses for correction of astigmatism | |
| JP4510177B2 (en) | Progressive focus lens for spectacles, manufacturing method thereof, and spectacles using the progressive focus lens for spectacles | |
| CN207301528U (en) | A kind of peripheral hyperopia defocus control eyeglass of fixed compensation amount | |
| KR20190018732A (en) | Method of manufacturing progressive spectacle lens, progressive spectacle lens, and method of designing progressive spectacle lens | |
| WO2016167104A1 (en) | Contact lens for suppressing progression of myopia, method for designing same, and method for manufacturing same | |
| JPWO2018079072A1 (en) | Orthodontic contact lens | |
| CN114911069A (en) | Modeling method of retina periphery defocusing model | |
| CN210155447U (en) | A multifunctional rigid contact lens | |
| CN115639686A (en) | orthokeratology lens | |
| TWI758731B (en) | A positioning structure for contact lenses | |
| CN114127620B (en) | Soft contact lenses with new stabilization zones for improved angular stability and comfort | |
| JP7566760B2 (en) | Optical device with desensitized rotational angular alignment for astigmatism correction - Patents.com | |
| CN114911073A (en) | Stepless out-of-focus lens and frame glasses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |