CN210155447U - Multifunctional hard corneal contact lens - Google Patents
Multifunctional hard corneal contact lens Download PDFInfo
- Publication number
- CN210155447U CN210155447U CN201921018457.XU CN201921018457U CN210155447U CN 210155447 U CN210155447 U CN 210155447U CN 201921018457 U CN201921018457 U CN 201921018457U CN 210155447 U CN210155447 U CN 210155447U
- Authority
- CN
- China
- Prior art keywords
- area
- lens
- lens body
- zone
- optical
- 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
Images
Abstract
The utility model provides a multi-functional rigid cornea contact lens, including the mirror body, the mirror body has outwards set gradually optics district from the center, has moved focal zone, location district and peripheral arc district, through luminosity, the biggest camber in location district and the relative luminosity of design tear fluid layer, when satisfying myopia out of focus design, the better trial of taking into account irregular cornea improves the marginal comfort of current RGP in high myopia is used, improves the universality of lens.
Description
Technical Field
The utility model relates to a contact lens technical field for correcting glasses vision, concretely relates to multi-functional rigid corneal contact lens.
Background
The existing hard corneal contact lens is good news of patients with high degrees, but the edge thickness of the lens is obviously increased along with the increase of the myopic degree, the comfortable experience of a wearer is reduced due to too thick edge, and even the situation that the wearing cannot be adapted to the wearer and the wearing cannot be maintained can occur.
The existing positioning design of the peripheral region in the hard corneal contact lens can only be suitable for one corneal shape, and the universality is limited.
In addition, in order to better control the myopia progression, according to the peripheral retinal defocus theory, peripheral vision must be considered while the central macular vision of the retina is ensured by correcting myopia. Irregular corneas are often accompanied by irregular astigmatism, and are more complex to fit than conventional corneas.
SUMMERY OF THE UTILITY MODEL
The utility model provides a hard corneal contact lens capable of improving the comfort level of the edge of a high myopia lens body.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a multifunctional hard corneal contact lens comprises a lens body, wherein an optical area, an out-of-focus area, a positioning area and a peripheral arc area are sequentially formed on the lens body from the center to the outside;
luminosity D of the tear layer formed between the lens body and the patient's corneatearThe following formula is satisfied:
Dtear＝Dcentre*0.25
wherein r is2Is the radius of curvature, r, of the optical zone of the rear surface of the lens bodycIs the central radius of curvature of the front surface of the lens body, and r2>rc，DcentreIs the optical power of the optical area of the lens body.
Further, in order to take account of the fitting of irregular corneas and improve the universality of the lens, the maximum curvature difference Δ of the positioning area from the starting point of the positioning area close to the out-of-focus 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, y1Y-axis coordinate of starting point of location area2To locate the y-axis coordinate of the end point of the field, y1' is y1First order partial derivative of (y)2' is y2First order partial derivative of (y)1"is y1Second order partial derivative of y2"is y2R is the initial curvature radius of the positioning area, e is the eccentricity, and W is the radius from the end point to the center line of the positioning area.
Further, in order to meet the requirement of the myopic defocus design and avoid the condition of retinal periphery overcorrection, the relative luminosity D of the lens body is determineddefocus＝Dperiphery-Dcentre> 0, wherein DperipheryIs the luminosity of the out-of-focus region, DcentreIs the optical power of the optical area of the lens body.
According to the above technical scheme, the utility model discloses a luminosity, the biggest camber in locating area and the relative luminosity of design tear fluid layer when satisfying myopia out of focus design, the better trial of taking into account irregular cornea improves the marginal comfort of current RGP in high myopia is used, improves the universality of lens.
Drawings
FIG. 1 is a schematic structural view of a hard contact lens of the present invention;
FIG. 2 is a schematic view of the lens in contact with the cornea and showing the tear layer;
FIG. 3 is a diagram of a prior art lens photometric value profile;
FIG. 4 is a graph of photometric values for the optical zone and the out-of-focus zone;
fig. 5 is a schematic view of object imaging of the mirror body.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in figure 1, the multifunctional hard corneal contact lens comprises a lens body 1, wherein an optical area 2, an out-of-focus area 3, a positioning area 4 and a peripheral arc area 5 are sequentially formed on the lens body from the center to the outside. The concave surface of the mirror is called the back surface and the convex surface of the mirror is called the front surface.
For patients with higher degrees of myopia, the flatter the anterior surface of the lens body, and the thicker the finished edge of the lens body. This optical law exists not only in the manufacture of contact lenses, but also in the fitting of frame spectacles, and when wearing frame spectacles, the edge thickness of the lens is often reduced by changing the refractive index of the lens, but the material of the contact lens is limited, thereby limiting the choice of refractive index. According to the optical law, as long as the processing power of the lens can be reduced, the edge of the processed lens can be thinned. The contact lens is worn on the eyeball, besides the lens itself provides the correction diopter, a lacrimal fluid layer 6 (refer to fig. 2) can be formed between the lens body 1 and the cornea 7 of the patient, the utility model discloses a lacrimal fluid layer that forms can share partial luminosity, and the luminosity of the lens body reduces to the purpose of edge thinning has been realized.
Luminosity D of the lacrimal fluid layer 6tearThe following formula is satisfied:
Dtear＝Dcentre*0.25
wherein r is2Is the radius of curvature, r, of the optical zone of the rear surface of the lens bodycIs the central radius of curvature of the front surface of the lens body, and r2>rc，DcentreIs the optical power of the optical area of the lens body. DcentreThe lens is a complete parameter of the lens body determined by the front and back surfaces and the central thickness of the lens, and the front and back surfaces are not distinguished.
r2>rc(ii) a And is
This relatively flat opticsThe zone design, applied to patients with irregular corneas, helps to improve their irregular astigmatism, while the positioning arc allows better positioning of the lens, which is greatly simplified compared to previous prescription of irregular corneas. The following table shows the contrast of the lens body edge thickness with the conventional design under different cornea central curvature K values and different near-sightedness:
due to DcentreAnd rcAre both objective data of the patient, measured directly, and the mirror edge of this design is thinned by about 20% compared to the previous conventional design.
In order to take account of the fitting of irregular cornea and improve the universality of the lens, the maximum curvature difference delta of the positioning area 4 from the starting point of the positioning area close to the out-of-focus area to the ending point of the positioning area close to the peripheral arc area is taken as a variable adjusting factor, and the following formula is satisfied:
wherein, y1Y-axis coordinate of starting point of location area2To locate the y-axis coordinate of the end point of the field, y1' is y1First order partial derivative of (y)2' is y2First order partial derivative of (y)1"is y1Second order partial derivative of y2"is y2R is the initial curvature radius of the positioning area, e is the eccentricity, and W is the radius from the end point to the center line of the positioning area.
The utility model discloses a change that satisfies the circumference portion in the cornea through adding variable adjustment factor in order to solve this problem, the adjustment factor is the maximum curvature difference △ of locating area initial position and termination, according to the curvature difference, we can reverse the eccentricity e value of lens, and the bigger the e value explains, explains that the radius of curvature change of location arc each point is comparatively fast.
The specific derivation process of the formula is as follows:
the general equation for the second order asphere is:
the first order partial derivative can be obtained:
similarly, the second-order partial derivative y is solved; the formula defined according to curvature is:
difference in maximum camber
Wherein R is the curvature radius value of the initial point of the positioning area close to the out-of-focus area of the positioning area, K2And K1The curvature values of the end point and the starting point of the positioning area are obtained by measuring the curvature radius value of the cornea positioning arc through the corneal topography, and W2And W1To locate the end and start of the arc, this data is also determined from measurements of each individual corneal diameter.
Then equation
Belongs to a unitary equation, and can derive the eccentricity e value at the positioning arc of the lens.
The concave lens is adopted for correcting the myopic eye, so that the light rays are diverged, the more the light rays are diverged, the smaller the negative power value of the lens is, or the higher the myopic power of a patient is.
Relative luminosity DdefocusAlso called relative defocus amount, and Ddefocus＝Dperiphery-DcentreWherein D isperipheryThe refractive value of the periphery of the human eye, DcentreIs the optical power of the optical area of the lens body.
If D isdefocus< 0, indicating that the light divergence degree of the center of the lens body is larger than that of the periphery;
if D isdefocus0, the divergence degree of the light rays in the center of the lens body is equal to that of the periphery;
if D isdefocusThe divergence degree of the light rays in the center of the lens body is less than that in the periphery of the lens body when the divergence degree of the light rays is more than 0.
In the prior art lens shown in fig. 3, the horizontal direction represents the distance from the center (0) to the periphery of the optical zone of the lens, negative values represent the left side of the center of the lens, and positive values represent the right side of the center of the lens; the vertical direction represents the optical zone refractive power distribution of the lens; from the example graph analysis, it can be seen that, in the existing spherical contact lens, when the central luminosity D is given, the diopter beyond the central zone (beyond 3 mm) of the lens tends to become smaller, that is, the peripheral light ray divergence degree of the optical zone of the spherical contact lens is larger, and if the myopia degree of the periphery of the optical zone is not so great, the peripheral retinal over-correction may occur, so that the peripheral retinal of the patient presents a hyperopic defocused state.
The utility model discloses distinguish the optics of original conventional design for two parts: a central optical zone 2 and an out-of-focus zone 3. The diameter of the optical area 2 is 3mm-6mm, the surface width of the out-of-focus area 3 is 1mm-3mm, the surface width of the positioning area 4 is 0.6mm-1.5mm, the total diameter of the lens body 1 is 9.0mm-11.5mm, and the optical area, the out-of-focus area, the positioning area and the peripheral arc area are aspheric surfaces.
The relative light degree of the lens body is designed to be Ddefocus＝Dperiphery-Dcentre> 0, said relative luminosity is between 0.5D and 5.0D, wherein D is a photometric unit.
As shown in FIG. 4, the optical zone 2 of the present invention is designed to be aspheric, and can form a suitable eccentricity e value, so that the illuminance is uniform, the relative illuminance of the defocus zone to the optical zone becomes large, such lens is worn on the cornea of the patient corresponding to the myopia degree, so the myopia state of the center is corrected, that is, the object is imaged in the macular area of the retina, and the image of the peripheral zone is either dropped on the periphery of the retina or in front of the periphery of the retina, so as to form the defocus for myopia. Light path is as shown in fig. 5, if the patient is near-sighted 325 degrees, wears the utility model discloses contact lens, optics district diameter 4mm, the optics district luminosity of lens is-3.25D, beam A, the complete optics district that passes through the mirror body, pass eyeball focus in the macula district of retina, the width from the focal zone is 1.5mm, the peripheral luminosity of mirror body is 1.75D, beam B and C, marginal light part passes through the out-of-focus district of the mirror body, passes the eyeball and focuses on the peripheral the place ahead of retina, has formed peripheral myopia out-of-focus.
The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (5)
1. A multifunctional hard corneal contact lens comprises a lens body, and is characterized in that an optical area, an out-of-focus area, a positioning area and a peripheral arc area are sequentially formed on the lens body from the center to the outside;
luminosity D of the tear layer formed between the lens body and the patient's corneatearThe following formula is satisfied:
Dtear＝Dcentre*0.25
wherein r is2Is behind the mirror bodyRadius of curvature of surface optical zone, rcIs the central radius of curvature of the front surface of the lens body, and r2>rc，DcentreIs the optical power of the optical area of the lens body.
2. The multifunctional hard contact lens of claim 1, wherein the maximum curvature difference Δ from the starting point of the positioning region near the out-of-focus region to the ending point of the positioning region near the peripheral arc region is used as a variable adjustment factor, and the following formula is satisfied:
wherein, y1Y-axis coordinate of starting point of location area2To locate the y-axis coordinate of the end point of the field, y1' is y1First order partial derivative of (y)2' is y2First order partial derivative of (y)1"is y1Second order partial derivative of y2"is y2R is the initial curvature radius of the positioning area, e is the eccentricity, and W is the radius from the end point to the center line of the positioning area.
3. Multifunctional hard corneal contact lens according to claim 1 or 2, wherein the relative luminosity D of the lens bodydefocus＝Dperiphery-Dcentre> 0, wherein DperipheryIs the luminosity of the out-of-focus region, DcentreIs the optical power of the optical area of the lens body.
4. The multifunctional hard corneal contact lens of claim 3, wherein the relative luminosity is between 0.5D and 5.0D, wherein D is a photometric unit.
5. The multi-functional hard contact lens of claim 1 or 2, wherein the optical zone has a diameter of 3mm to 6mm, the out-of-focus zone has a surface width of 1mm to 3mm, the positioning zone has a surface width of 0.6mm to 1.5mm, the lens body has an overall diameter of 9.0mm to 11.5mm, and the optical zone, the out-of-focus zone, the positioning zone and the peripheral arc zone are aspheric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018457.XU CN210155447U (en) | 2019-07-02 | 2019-07-02 | Multifunctional hard corneal contact lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018457.XU CN210155447U (en) | 2019-07-02 | 2019-07-02 | Multifunctional hard corneal contact lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210155447U true CN210155447U (en) | 2020-03-17 |
Family
ID=69765076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921018457.XU Active CN210155447U (en) | 2019-07-02 | 2019-07-02 | Multifunctional hard corneal contact lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210155447U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110275316A (en) * | 2019-07-02 | 2019-09-24 | 欧普康视科技股份有限公司 | A kind of multi-functional hard corneal contact lens |
-
2019
- 2019-07-02 CN CN201921018457.XU patent/CN210155447U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110275316A (en) * | 2019-07-02 | 2019-09-24 | 欧普康视科技股份有限公司 | A kind of multi-functional hard corneal contact lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6726929B2 (en) | Multifocal optical lens | |
| US7338160B2 (en) | Contact lens with shaped periphery | |
| KR101166623B1 (en) | Method and apparatus for controlling peripheral image position for reducing progression of myopia | |
| JP4183772B2 (en) | Multifocal concentric annular lens and design method thereof | |
| EP2560040B1 (en) | Contact lens for correction of irregular astigmatism | |
| KR20160026725A (en) | Freeform lens design and method for preventing and/or slowing myopia progression | |
| JP6474542B2 (en) | Contact lenses with improved fit characteristics | |
| CN110275316A (en) | A kind of multi-functional hard corneal contact lens | |
| CN114391121A (en) | Lenses and methods for retarding myopia progression | |
| JP2019530012A (en) | Contact lens with lenticular in the upper part of the contact lens | |
| JP2007526512A (en) | Eyeglass lens with supporting peripheral edge | |
| 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 | |
| CN215986770U (en) | Cornea plastic mirror for reshaping front surface shape of cornea | |
| CN212965668U (en) | Ring focus myopia lens for delaying myopia progression and preparation mold thereof | |
| EP3370905A1 (en) | Chiral scleral lenses | |
| CN210155447U (en) | Multifunctional hard corneal contact lens | |
| WO2016167104A1 (en) | Contact lens for suppressing progression of myopia, method for designing same, and method for manufacturing same | |
| CN107627635B (en) | Molds for contact lenses having non-rotationally symmetric edges or rims | |
| CN215117038U (en) | Stepless out-of-focus lens and frame glasses | |
| CN216434567U (en) | Ophthalmic defocusing lens | |
| US20220206320A1 (en) | Optical frame glasses | |
| JPWO2018079072A1 (en) | Orthodontic contact lens | |
| CN114911069A (en) | Modeling method of retina periphery defocusing model | |
| CN219417914U (en) | Partitioned gradual change multiple spot defocus type myopia prevention and control lens | |
| CN215117039U (en) | Stepless out-of-focus lens and frame glasses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |