CN114077069A - Multi-arc multi-segment cornea molding contact lens positioning structure and method - Google Patents
Multi-arc multi-segment cornea molding contact lens positioning structure and method Download PDFInfo
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- CN114077069A CN114077069A CN202010819142.6A CN202010819142A CN114077069A CN 114077069 A CN114077069 A CN 114077069A CN 202010819142 A CN202010819142 A CN 202010819142A CN 114077069 A CN114077069 A CN 114077069A
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- cornea
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- 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
- G02C7/048—Means for stabilising the orientation of lenses in the eye
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- 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
- G02C7/021—Lenses; Lens systems ; Methods of designing lenses with pattern for identification or with cosmetic or therapeutic effects
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- 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
- G02C7/024—Methods of designing ophthalmic lenses
Abstract
The invention relates to a multi-arc multi-section cornea molding contact lens positioning structure and a method, wherein the center of the inner surface of the lens comprises a base arc, the outer side of the base arc is outwards provided with an inverted arc, the outer side of the inverted arc is outwards provided with an adaptive arc positioned on the cornea of an eyeball, the outer side of the adaptive arc is outwards provided with a side arc, the surface of the cornea is provided with a positioning area in the area contacting with the adaptive arc, the positioning area is divided into a plurality of blocks, and a plurality of positioning blocks which are in accordance with the curvature values of the blocks in the positioning area are formed in the positions of the adaptive arc corresponding to the blocks, because the plurality of positioning blocks of the adaptive arc are in accordance with the curvature value of the cornea, the lens can be stably positioned on the eyeball, when the eyelid of a wearer is closed, the lens is not easy to axially rotate and is not aligned accurately, and further the base arc of the lens can really apply pressure on the surface of the cornea of the eyeball, thereby achieving the effect of improving and reducing the myopia degree or eliminating the stability of the myopia degree.
Description
Technical Field
The invention relates to a multi-arc and multi-section cornea molding contact lens positioning structure and a method, in particular to a plurality of positioning blocks of an adaptive arc of a lens, which are curvature values according with a cornea, so that the lens can be stably positioned on an eyeball, the lens is not easy to generate axial rotation and inaccurate alignment, and a base arc of the lens is extruded on the corneal surface of the eyeball.
Background
Along with research, development and innovation of various electronic and electrical products, people are convenient and fast in daily life and work, and especially, the popularization of application of electronic products in communication and internet is caused, so that many people are immersed in the use field of electronic products, the coverage range of the electronic products is quite wide no matter office workers, student groups or middle-aged and old people, the phenomena of low head are derived, the situations of eye vision loss, injury and the like of many people are serious day by day, and the shortsightedness population is relatively improved.
Furthermore, myopia is caused by the mismatching of the light bending ability of the eye and the length of the eye, which may be caused by the overlong axis of the eye or the too steep arc of the cornea, so that the imaging point of the object falls in front of the retina, which causes the blur of the object during imaging, therefore, in order to correct the myopia, the light bending ability of the eye needs to be reduced, and since the light bending ability of the cornea accounts for about 80% of the whole eye, the effect of correcting the myopia can be achieved by only reducing the refractive power of the cornea.
The present methods for correcting ametropia mainly include a method of correcting a wearer's eyes, a method of correcting a wearer's contact lens, a method of correcting a corneal myopia, or a method of correcting a corneal plastic-molded piece, each of which has advantages and disadvantages, and the methods are particularly studied with respect to a corneal plastic-molded piece, wherein the corneal plastic-molded piece is made of a material having high oxygen permeability, after the lens is worn on an eyeball, a layer of tear fluid which is unevenly distributed is sandwiched between the lens and an outer surface of the cornea of the eyeball, so that epithelial cells can be flattened by a forward pressure applied to the cornea by the tear fluid, and meanwhile, if the wearer performs an eye-closing action by using an eyelid, a certain pressure is applied to the cornea by the weight of the eyelid and the lens, and if the wearing time is sufficient, the central curvature of the cornea is gradually flattened and the central center of the cornea is gradually thinned, thereby reducing the refractive power of the cornea and achieving the effects of correcting myopia degrees and even restoring normal vision.
However, the cornea surface of the eye is not a perfect smooth curve, so when the cornea-shaping sheet is worn on the eye, it is easy to rotate or misaligned, so that when a certain pressure is applied to the cornea by the base curve of the cornea-shaping sheet, it is possible to press the cornea inaccurately, which results in failure to restore the power correction to the normal vision state.
Therefore, how to try to solve the above-mentioned drawbacks and inconveniences of the prior art is a direction in which related practitioners in the industry are keenly looking to research and improve.
Disclosure of Invention
Therefore, in view of the above-mentioned shortcomings, the inventor of the present invention has developed a multi-arc multi-segment corneal remodelling contact lens positioning structure and method by collecting relevant data, evaluating and considering it in multiple ways, and using the accumulated years of experience in the industry, and by trial and modification.
The main objects of the present invention are: when the eyelids of the wearer are closed, the lens is not easy to rotate axially and is not aligned exactly, and then tear between the base arc of the lens and the cornea exerts a positive pressure on the cornea surface of the eyeball, thereby achieving the purpose of improving and reducing the myopic degree or eliminating the stability of the myopic degree.
The invention provides a multi-arc multi-section cornea molding contact lens positioning structure, the center of the inner surface of the lens comprises a base arc which applies a positive pressure on the surface of a cornea through tears between the lens and the cornea of an eyeball, the outer side of the base arc is outwards provided with a reversal arc, the outer side of the reversal arc is outwards provided with a matching arc positioned on the cornea, the outer side of the matching arc is outwards provided with a side arc, a positioning area is formed on the surface of the cornea in contact with the matching arc, a plurality of blocks are divided in the positioning area, a plurality of positioning blocks which are in accordance with the curvature values of the blocks in the positioning area are formed in the positions of the matching arc corresponding to the blocks, and the lens can be stably positioned on the eyeball because the plurality of positioning blocks of the matching arc are in accordance with the curvature values of the cornea, so that when an eyelid of a wearer is closed, the lens is not easy to axially rotate and be aligned incorrectly, thereby truly applying a positive pressure on the cornea surface of the eyeball to the tear between the base curve of the lens and the cornea, and achieving the purpose of improving and reducing the myopic degree or eliminating the stability of the myopic degree.
Wherein, the number of the positioning blocks of the adaptive arc is even.
Wherein, the inner surface of the lens is aspheric.
The invention also provides a method for molding a contact lens by using the multi-arc and multi-segment cornea, which comprises the following steps:
step A: firstly, measuring the cornea of an eyeball by a cornea map instrument to obtain a plurality of radian numerical values in the cornea;
and B: the method comprises the following steps of calculating curvature values of the cornea of an eyeball by utilizing an electronic device, dividing a positioning area in the cornea, which accords with an adaptive arc of a lens to be manufactured, into a plurality of blocks, and calculating a plurality of curvature values of the cornea in each block into a curvature value by a preset algorithm;
and C: and then, manufacturing the lens according to the curvature values of the blocks by using a lens manufacturing machine, so that a plurality of positioning blocks which are in accordance with the curvature values of the blocks are formed on the fitting arc of the lens.
Wherein, the electronic device in the step B is a desktop computer, a notebook computer or an industrial computer.
Wherein, the number of the positioning blocks of the adaptive arc in the step B is even.
Wherein, the radian of the fitting arc of the lens adjacent to one side of the preset nose is smaller than the radian at the opposite side of the nose.
The electronic device in step B divides the positioning area of the cornea into eight blocks, wherein in the dividing process, the positioning area of the cornea is divided into four blocks in the X, Y axial direction, then divided into eight blocks at 45 ° angles among the four blocks, and further divided into eight blocks, the fitting arc of the lens is formed into eight positioning blocks through the eight blocks, and the eight positioning blocks are used for lifting and positioning.
The electronic device in step B is to use the corneal center point of the eyeball as the origin of the X, Y coordinate system, and the predetermined algorithm can be the following formula:
The lens manufacturing machine in the step C is an aspheric surface manufacturing machine, so that the lens is manufactured by an aspheric surface manufacturing method.
Drawings
FIG. 1 is a top sectional view of the lens of the present invention.
FIG. 2 is a schematic view of an eyeball according to the present invention.
FIG. 3 is a flow chart of the present invention.
List of reference numerals: 1-a lens; 11-base arc; 12-a reverse arc; 13-fitting arc; 131-a positioning block; 14-side arc; 2-eyeball; 21-the cornea; 211-a localization zone; 2111-block.
Detailed Description
To achieve the foregoing and other objects, and in accordance with the purpose of the invention, as embodied and broadly described herein, the following detailed description is provided to explain preferred embodiments of the invention and to provide a thorough understanding of the invention.
Referring to fig. 1, 2 and 3, which are a schematic top view cross-sectional view, an eyeball schematic view and a flow chart of the lens of the present invention, it can be clearly seen from the figures that the lens 1 is a corneal plastic sheet for wearing on the eyeball 2, and is made of a circular arc-shaped material and made of a highly oxygen-permeable material, the inner surface of the lens 1 is attached to the surface of the cornea 21 of the eyeball 2, and includes a base arc 11(BC) applying a positive pressure on the surface of the cornea 21 through tears (not shown) between the lens 1 and the cornea 21 at the center of the inner surface of the lens 1, and the outer side of the base arc 11 is sequentially provided with an inverted arc 12(RC) outwards, and the outer side of the inverted arc 12 is provided with an adaptive arc 13(AC) positioned on the cornea 21 outwards, and the outer side of the adaptive arc 13 is provided with an outward arc 14(PC), and a positioning area 211 is formed on the surface of the cornea 21 and is contacted with the adaptive arc 13, and a plurality of blocks 2111 are divided in the positioning area 211, and a plurality of positioning blocks 131, which are even in number (e.g., 2, 4, 6, 8, 10 or 12) and conform to the curvature values of the plurality of blocks 2111, are formed in the fitting arc 13 at positions corresponding to the plurality of blocks 2111.
Moreover, the predetermined curvature of the base curve 11 of the lens 1 is greater than the horizontal curvature of the cornea 21 of the eyeball 2 (i.e. the curvature of the base curve 11 is flatter than the horizontal curvature of the cornea 21), and since the curvature of the base curve 11 is greater than the curvature of the cornea 21, when the lens 1 is worn on the eyeball 2, a positive pressure can be generated on the epithelial cells of the cornea 21 by tears between the base curve 11 and the cornea 21; in addition, the reversed arc 12 of the lens 1 is for storing tears, so that the negative pressure provided by tears can improve the positioning of the lens 1 on the eyeball 2.
The arc 14 of the lens 1 preferably has a slightly raised edge, so as to press tears during blinking, so as to promote the circulation of tears inside the lens 1, i.e. the tears circulate to keep lubrication between the lens 1 and the cornea 21 of the eyeball 2 and to carry oxygen, thereby improving comfort and wearability during wearing.
And the radian of the fitting arc 13 of the lens 1 adjacent to one side of the nose is smaller than that of the opposite side of the nose.
The inner surface of the lens 1 is aspheric.
When the lens 1 of the present invention is actually manufactured, the following steps may be included:
step A: the cornea 21 of the eyeball 2 may be first measured by a corneal mapper to obtain a plurality of radian values in the cornea 21.
And B: the curvature value of the cornea 21 of the eyeball 2 is calculated by an electronic device, a positioning area 211 in the cornea 21, which is in accordance with the fitting arc 13 of the lens 1 to be manufactured, is divided into a plurality of blocks 2111, and a plurality of curvature values of the cornea 21 in each block 2111 are calculated into a curvature value by a preset algorithm.
And C: then, the lens 1 is manufactured by the lens manufacturing machine according to the curvature values of the areas 2111, so that a plurality of positioning areas 131 conforming to the curvature values of the areas 2111 are formed on the fitting arc 13 of the lens 1, and the lens 1 is manufactured.
How the cornea map instrument measures the cornea 21 of the eyeball 2 in the step a to obtain a plurality of radian values in the cornea 21 is the scope of the prior art, so the internal electronic parts and circuit design are not repeated for understanding.
Furthermore, the electronic device in step B may be a desktop computer, a notebook computer, an industrial computer or other electronic devices with computing functions.
In the step B, the electronic device can divide the positioning area 211 of the cornea 21 into eight blocks 2111, and in the dividing process, the positioning area 211 of the cornea 21 can be divided into four blocks 2111 in the X, Y axial direction, and then divided into 45 ° angles of the four blocks, so as to divide the positioning area 211 into eight blocks 2111, that is, eight positioning blocks 131 can be formed by the fitting arc 13 of the lens 1 through the eight blocks 2111, and the eight positioning blocks 131 can be used for lifting and positioning.
However, the electronic device in the step B may use the central point of the cornea 21 of the eyeball 2 as the origin (0, 0) of the coordinate system (X, Y), and the predetermined algorithm may be the following formula:
where z represents the distance from the origin in the Y direction, c represents the central curvature of the cornea 21, r represents the distance from the origin in the X direction, k represents the asphericity (asphericity), and k-e2And e is eccentricity.
In addition, the lens manufacturing machine in the step C may be an aspheric surface manufacturing machine to manufacture the lens 1 by an aspheric surface manufacturing method, but many apparatuses and components related to the inside of the lens manufacturing machine are not the key point of the present invention, and thus are not described in detail and will be understood.
When the present invention is actually worn and used, the testing and matching staff can firstly measure the cornea 21 of the eyeball 2 of the wearer by the cornea map instrument to obtain a plurality of radian values in the cornea 21 of the wearer, the cornea map instrument can transmit the radian values to the electronic device, at this time, the testing and matching staff can use the electronic device to calculate the curvature value so as to divide the positioning area 211 in the cornea 21, which is in accordance with the fitting arc 13 of the lens 1 to be manufactured, into a plurality of blocks 2111, and calculate the radian values of the cornea 21 in each block 2111 into a curvature value by the preset algorithm, the electronic device can transmit the curvature values in the cornea 21 to the lens manufacturing machine, and the lens manufacturing machine can manufacture the lens 1 according to the curvature values of the blocks 2111 so as to form a plurality of positioning blocks 131 in accordance with the curvature values of the blocks 2111 on the fitting arc 13 of the lens 1, the wearer can wear the manufactured lens 1 on the eyeball 2 and make the inner surface of the lens 1 contact with the surface of the cornea 21 of the eyeball 2, at this time, because the fitting arc 13 is formed with a plurality of positioning blocks 131, and the plurality of positioning blocks 131 conform to the curvature value on the cornea 21, so that the lens 1 can be stably positioned on the eyeball 2, when the wearer sleeps at night and closes the eyelid (not shown in the figure), the lens 1 is not easy to axially rotate and is not aligned exactly, and further, the tear liquid between the base arc 11 and the cornea 21 of the lens 1 can really apply a positive pressure on the epithelial cells at the center of the surface of the cornea 21 of the eyeball 2, and the central curvature of the epithelial cells on the surface of the cornea 21 is relatively flat when being pressed by the tear liquid, thereby thinning the central epithelial layer of the cornea 21, further reducing the refractive power of the cornea 21, and making the eye forming point of the object move towards the retina (not shown in the figure) of the eyeball 2, thereby achieving the effect of improving and reducing the myopia degree or eliminating the stability of the myopia degree.
It should be understood that the above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, so that the present invention is not limited by the above description and the accompanying drawings.
Claims (10)
1. A multi-arc multi-section cornea molding contact lens positioning structure is characterized in that the center of the inner surface of a lens comprises a base arc which applies positive pressure on the surface of a cornea through tears between the lens and the cornea of an eyeball, a reverse arc is arranged outwards on the outer side of the base arc, a matching arc positioned on the cornea is arranged outwards on the outer side of the reverse arc, a side arc is arranged outwards on the outer side of the matching arc, a positioning area is formed on the area, contacting with the matching arc, of the surface of the cornea, a plurality of blocks are divided in the positioning area, and a plurality of positioning blocks which are in accordance with the curvature values of the blocks in the positioning area are formed in the positions, corresponding to the blocks, of the matching arc.
2. The multi-arc multi-segment corneal shaping contact lens positioning structure of claim 1, wherein the number of the fitting arcs is an even number.
3. The multi-arc multi-segment corneal remodelling contact lens positioning structure of claim 1, wherein said lens inner surface is aspheric.
4. A method of molding a contact lens from a multi-arc, multi-segment cornea, comprising the steps of:
step A: firstly, measuring the cornea of an eyeball by a cornea map instrument to obtain a plurality of radian numerical values in the cornea;
and B: the method comprises the following steps of calculating curvature values of the cornea of an eyeball by utilizing an electronic device, dividing a positioning area in the cornea, which accords with an adaptive arc of a lens to be manufactured, into a plurality of blocks, and calculating a plurality of curvature values of the cornea in each block into a curvature value by a preset algorithm;
and C: and then, manufacturing the lens according to the curvature values of the blocks by using a lens manufacturing machine, so that a plurality of positioning blocks which are in accordance with the curvature values of the blocks are formed on the fitting arc of the lens.
5. The method of claim 4, wherein the electronic device in step B is a desktop computer, a notebook computer or an industrial computer.
6. The method of claim 4, wherein the number of segments for fitting the arc in step B is even.
7. The method of claim 4, wherein the arc of the mating curve of the lens adjacent the intended side of the nose is less than the arc at the opposite side of the nose.
8. The method of claim 4, wherein the electronic device in step B divides the corneal location area into eight zones, wherein the dividing step comprises dividing the corneal location area into four zones along the X, Y axial direction, dividing the corneal location area into eight zones along the 45 ° angle of the four zones, and dividing the corneal location area into eight zones, forming eight location zones by the eight zones to form the lens fitting arc, and using the eight location zones to promote the positioning.
9. The method of claim 4, wherein the electronic device in step B is to use the corneal center point of the eyeball as the origin of X, Y coordinate system, and the predetermined algorithm is as follows:
10. The method of claim 4, wherein the lens-making machine of step C is an aspheric-surface-making machine for making lenses by aspheric-surface-making method.
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| CN202010819142.6A CN114077069A (en) | 2020-08-14 | 2020-08-14 | Multi-arc multi-segment cornea molding contact lens positioning structure and method |
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| CN202010819142.6A CN114077069A (en) | 2020-08-14 | 2020-08-14 | Multi-arc multi-segment cornea molding contact lens positioning structure and method |
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