CN212694189U - Design structure of corneal plastic sheet in reverse arc - Google Patents

Abstract

The creation is about a corneal plastic molding piece in the design structure of reversal arc, this lens internal surface center department includes the base arc, and the base arc outside is equipped with reversal arc, adaptation arc and side arc outwards in proper order, and base arc and reversal arc junction form with the linear distance of cornea in the crossing point between 89 mu m-189 mu m, because the linear distance of crossing point and cornea is between 89 mu m-189 mu m, so than the ordinary corneal plastic molding lens, can provide more near-sighted peripheral defocus, promote near-sighted control effect from this.

Description

Design structure of corneal plastic sheet in reverse arc

Technical Field

The present invention relates to a design structure of a corneal remodelling sheet in an inverted arc, and more particularly to a design structure of a lens in which the distance between the intersection point between the base arc and the inverted arc and the cornea is 89 to 189 μm, so that when an eyelid is closed, more myopic peripheral defocus can be provided compared with a common corneal remodelling lens, thereby improving the myopia control effect.

Background

Accordingly, with the development and innovation of various electronic and electrical products, people are convenient and fast in daily life and work, and especially, the popularization of the application of electronic products in communication and internet is further caused, so that many people are immersed in the application field of electronic products, the coverage range of the electronic products is quite wide for a long time, no matter office workers, student groups, middle-aged and old people and the like, and then the phenomenon of head lowering is derived, and therefore 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 myopia control effect of the general low-power corneal remodelling sheet (between about 50 and 400 degrees) is mostly poor, and the experimenter obtains the experimental data of fig. 4 through repeated experiments for understanding the reason, fig. 4 is a data diagram of the conventional tear thickness analysis, as can be clearly seen from fig. 4, the tear thicknesses of 500, 700 and 900 degrees of myopia of the corneal remodelling sheets with curvatures 39, 42 and 46 are all more than 90 μm, and the myopia can be effectively controlled because the myopic 500-degree corneal remodelling lens can provide more myopic defocus degrees relative to the low-power corneal remodelling lens, but the base arcs of the corneal remodelling sheet are all spherical, so that at a low power, the space for tear accumulation formed by the base arcs of the corneal remodelling sheet matching with the inverted arcs on one side is insufficient, and the myopia control cannot be effectively performed by the low-power corneal remodelling sheet nowadays.

Therefore, how to try to solve the above-mentioned existing drawbacks and inconveniences is a direction that those skilled in the art are eagerly looking to research and improve.

SUMMERY OF THE UTILITY MODEL

Therefore, in view of the above-mentioned shortcomings, the inventor has searched relevant data, and has designed a new patent of the design structure of the corneal plastic sheet in the reverse arc through many evaluations and considerations, and through continuous trial and modification based on years of experience accumulated in the industry.

The main purpose of this creation is: when the eyelids are closed, compared with a common cornea molding lens, the near-sighted cornea molding lens can provide more near-sighted peripheral defocus degrees, thereby achieving the purpose of improving the near-sighted control effect.

The secondary objective of the present invention is to increase the peripheral defocus area imaged on the retina, so as to effectively control the speed of the change of the eye axis, thereby effectively controlling the myopia, and achieving the purpose of correcting the myopia.

In order to realize the purpose, the technical scheme adopted by the creation is as follows:

the creation provides a design structure of a cornea molding sheet in a reverse arc, the lens is worn on the surface of the cornea of a preset eyeball, the center of the inner surface of the lens comprises a base arc with eccentricity between 0 and 4, the outer side of the base arc is sequentially provided with the reverse arc, an adapting arc and a side arc outwards, an intersection point is formed at the joint of the base arc and the reverse arc, and the linear distance between the intersection point between the base arc and the reverse arc and the cornea of the preset eyeball is between 89 mu m and 189 mu m. Therefore, in the creation, when the eyelid is closed, more myopic peripheral defocus degrees can be provided compared with the common cornea molding lens, thereby achieving the purpose of improving the myopia control effect.

Wherein, the eccentricity of the base arc of the lens is non-zero and the eccentricity of the image screen imaged on the retina of the preset eyeball is non-zero. Therefore, the peripheral out-of-focus area of this creation multiplicable formation of image on the retina, and then the speed of effective control eye axis change to effective control myopia, reach the purpose for correcting myopia from this.

Wherein, the reverse arc of the lens is aspheric. The eccentricity is non-zero, so the eccentricity of the image screen on the retina of the eyeball can be non-zero by the creation, the peripheral defocusing area on the retina is increased, the change speed of the eye axis is effectively controlled, the myopia is effectively controlled, and the effect of correcting the myopia is achieved.

Drawings

Fig. 1 is a side sectional view of the present invention.

Fig. 2 is a schematic diagram of the optical path of the present invention.

FIG. 3 is a data diagram of the distance between the lens and the cornea of the present invention.

Fig. 4 is a data graph of a conventional tear thickness analysis.

List of reference numerals: 1: a lens; 11: a base arc; 111: a point of intersection; 12: reversing the arc; 13: fitting an arc; 14: side arc; 2: an eyeball; 21: a cornea; 22: the retina.

Detailed Description

To achieve the above objects and advantages, the present invention provides a method and structure for implementing the same, which is characterized in that the following drawings are provided to illustrate the preferred embodiments of the present invention in detail.

Referring to fig. 1, 2 and 3, there are shown a side sectional view, a schematic view of an optical path and a data diagram of the distance between the lens and the cornea, as can be clearly seen from the drawings, the lens 1 is a cornea molding sheet which can be worn on the eyeball 2, is in a circular arc shape and is made of high oxygen permeable material, the inner surface of the lens 1 is attached to the surface of the cornea 21 of the eyeball 2, the center of the inner surface of the lens 1 comprises a base arc 11(BC) which has an eccentricity of 0-4 and applies a positive pressure to the surface of the cornea 21 through tears (not shown in the figure) between the lens 1 and the cornea 21, a reverse arc 12(RC), a matching arc 13(AC) and a side arc 14(PC) are sequentially arranged outside the base arc 11, and an intersection point 111 is formed at the joint of the base arc 11 and the reverse arc 12, the straight-line distance between the intersection 111 of the base arc 11 and the inverted arc 12 and the cornea 21 of the eyeball 2 is 89 μm to 189 μm.

The base curve 11 and the inversion curve 12 of the lens 1 are aspheric (i.e., have non-zero eccentricity).

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.

When the lens 1 of the present invention is manufactured, the eccentricity of the base arc 11 of the lens 1 is between 0 to 4 by a preset processing machine, the straight-line distance between the intersection point 111 and the cornea 21 of the eyeball 2 is between 89 μm to 189 μm by using the base arc 11 with the eccentricity between 0 to 4, and when the lens 1 is actually worn, the user can wear the lens 1 on the eyeball 2 first and contact the inner surface of the lens 1 with the surface of the cornea 21 of the eyeball 2, at this time, tears with uneven thickness are generated between the inner surface of the lens 1 and the cornea 21, when the user closes an eyelid (not shown in the figure) at night, the eyelid will press against the outer surface of the lens 1, and simultaneously, the weight of the eyelid and the lens 1 will generate a positive pressure, and a positive pressure is applied to the central epithelial cells of the cornea 21 of the eyeball between the base arc 11 of the lens 1 and the cornea 21, the epithelial cells on the surface of the cornea 21 are squeezed by tears, so that the central radian of the epithelial cells is gradually flattened, the central epithelial layer of the cornea 21 is thinned, the refractive power of the cornea 21 is reduced, and the image point of the object moves towards the retina 22 of the eyeball 2, so that the effect of reducing the myopia degree or eliminating the myopia degree is achieved.

And the straight line distance between the intersection point 111 between the base arc 11 and the inversion arc 12 and the cornea 21 of the eyeball 2 is between 89 mu m and 189 mu m, so when the eyelid is closed, more myopic peripheral defocus can be provided compared with a common cornea molding lens, and the effect of improving myopia control can be achieved.

Furthermore, the base curve 11 of the lens 1 is aspheric (the eccentricity is non-zero), so that the eccentricity of the image screen formed on the retina 22 of the eyeball 2 is non-zero to increase the peripheral defocus area formed on the retina 22, thereby effectively controlling the speed of the change of the eye axis, and thus effectively controlling the myopia, thereby achieving the effect of correcting the myopia.

It should be understood that the above description is only a preferred embodiment of the present disclosure, and not intended to limit the scope of the present disclosure, so that the present disclosure and drawings should be interpreted as including all the modifications and equivalents thereof.

Claims (3)

1. A design structure of a cornea molding sheet on an inversion arc is characterized in that a lens is worn on the surface of the cornea of a preset eyeball, the center of the inner surface of the lens comprises a base arc with eccentricity between 0 and 4, the outer side of the base arc is sequentially provided with the inversion arc, an adaptation arc and a side arc outwards, an intersection point is formed at the joint of the base arc and the inversion arc, and the linear distance between the intersection point between the base arc and the inversion arc and the cornea of the preset eyeball is between 89 mu m and 189 mu m.

2. The corneal sculpting piece having a reverse curvature as in claim 1, wherein the base curve eccentricity of the lens is non-zero and the screen eccentricity of the image imaged on the retina of the intended eye is non-zero.

3. The corneal remodelling device of claim 1, wherein the lens has an inverted arc design, wherein the inverted arc is aspheric.

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