TWI748612B - The structure of the orthokeratology lens in the parallel arc (Alignment Curve) - Google Patents

Abstract

The present invention relates to a structure of a orthokeratology lens with parallel arcs. The center of the inner surface of the lens includes a base arc, and the outer side of the base arc is provided with reverse arcs, parallel arcs and side arcs in sequence outwards, and the base arc The center is formed with a center point with a straight line distance from the cornea of the eyeball between 9μm~21μm. The straight line distance between the center point and the cornea is between 9μm~21μm, so when the lens is closed on the eyelid, the deviation can be reduced. Amount to enhance the visual correction effect.

Description

The structure of the orthokeratology lens in the parallel arc (Alignment Curve)

The present invention relates to a structure of a orthokeratology lens in parallel arcs, in particular, that the distance between the center point of the base arc of the lens and the cornea is between 9 and 21 μm, so as to reduce the deviation of the lens.

According to the research, development and innovation of various electronic and electrical products have brought people a lot of convenience in daily life and work. People are immersed in the field of use of electronic products, and a large number of electronic products are used for a long time, whether it is office workers, student groups or middle-aged and elderly people, etc., the coverage is also quite wide, which in turn derives the phenomenon of bowing people, and thus creates many People's eyesight loss, injuries, etc. are becoming more and more serious, and the myopia population is relatively increasing.

Furthermore, people’s myopia is caused by the mismatch between the tortuosity of the eye’s light and the length of the eye. It may be that the eye’s axis is too long or the corneal arc is too steep, causing the imaging point of the visual object to fall in front of the retina. It causes blurring of vision when imaging, so in order to correct myopia, it is necessary to reduce the tortuosity of the eye's light. Since the cornea's light tortuosity accounts for about 80% of the entire eye, the effect of correcting myopia can be achieved by reducing the refractive power of the cornea. .

The current methods of correcting refractive errors mainly include wearing glasses for correction, wearing contact lenses for correction, corneal myopia surgery or wearing corneal shaping lenses for correction. The methods have their own advantages and disadvantages. Here, the research is especially aimed at orthokeratology lenses. The orthokeratology lenses are made of high oxygen-permeable hard materials. When the lens is worn on the eyeball, the lens will be A layer of unevenly distributed tears is sandwiched between the outer surface of the cornea of the eyeball. The positive pressure exerted by the tears on the cornea can squeeze the epithelial cells. At the same time, if the wearer uses the eyelid to close the eye, it will The weight of the eyelid and the lens exerts a certain amount of pressure on the cornea. If worn for enough time, the central curvature of the cornea and the central epithelial layer can gradually become thinner, so as to flatten the center of the cornea and reduce the refractive power of the cornea. , To achieve the effect of correcting myopia and even returning to normal vision.

However, when the general orthokeratology lens is actually worn, the orthokeratology lens will be squeezed and rubbed when the eyelids are closed, so that the orthokeratology lens is prone to offset, which makes it impossible to flatten the corneal epithelial cells. When the orthokeratology lens has a low power (between 50 and 400 degrees), the base curve of the orthokeratology lens is spherical, so the spherical base curve is matched with one The space formed by the side reversal arc for the accumulation of tear fluid will be insufficient, so that the epithelial cells cannot be effectively squeezed, resulting in poor myopia control effect.

Therefore, how to try to solve the above-mentioned deficiencies and inconveniences of conventional use is the direction that relevant industries engaged in this industry urgently want to study and improve.

Therefore, in view of the above-mentioned deficiencies, the inventor collected relevant information, evaluated and considered in many ways, and based on the accumulated years of experience in this industry, through continuous trials and revisions, he began to design this kind of orthokeratology lens in parallel arcs. Inventor of the structure.

The main purpose of the present invention is to include a base at the center of the inner surface of the lens Arc, and the outer side of the base arc is provided with a reversal arc, a parallel arc, and a side arc in sequence, and a center point is formed at the center of the base arc, and a first intersection is formed at the intersection of the base arc and the reversal arc, and then A second point of intersection is formed at the intersection of the inverted arc and the parallel arc, and a third point of intersection is formed at the intersection of the parallel arc and the side arc. The linear distance between the center point and the cornea of the eyeball is between 9μm and 21μm. Since the linear distance between the center point and the cornea is between 9μm and 21μm, when the lens is closed on the eyelid, the offset can be reduced, and the purpose of vision correction can be improved.

The secondary purpose of the present invention is that the base curve of the lens is aspherical, so that the eccentricity of the image screen imaged on the retina of the eyeball can be made non-zero, so as to increase the peripheral defocus area of the image on the retina, thereby effectively Control the speed of eye axis change, thereby effectively controlling myopia or hyperopia, thereby achieving the purpose of correcting myopia or hyperopia.

Another object of the present invention is that the third intersection point between the parallel arc and the side arc is in contact with the corneal surface of the eyeball, and the third intersection point touches the most, so that when the eyelid of the lens is closed, it is not easy to shake In this case, the offset of the lens can be reduced, so that the accuracy of the extrusion can be improved, so as to achieve the purpose of accurately squeezing the surface of the cornea.

Another object of the present invention is that the linear distance between the first intersection point and the cornea is between 89μm~189μm, so when the eyelid is closed, the thickness of the tear fluid between the first intersection point and the cornea can effectively reduce the corneal epithelial cells Flatten, so as to achieve the purpose of improving the effect of myopia control.

1: lens

11: base arc

110: Center point

111: First Node

12: Reverse arc

121: second intersection

13: Parallel arc

131: Third Node

14: Edge arc

2: eyeball

21: Cornea

22: Retina

[Figure 1] is a side cross-sectional view of the present invention.

[Figure 2] is a schematic diagram of the optical path of the present invention.

[Figure 3] is a data diagram of the distance between the lens of the present invention and the cornea.

In order to achieve the above-mentioned purposes and effects, the technical means and structure adopted by the present invention are illustrated in detail below with regard to the preferred embodiments of the present invention, so as to fully understand the features and functions.

Please refer to Figures 1 and 2, which are side sectional views and schematic diagrams of the light path of the present invention. It can be clearly seen from the figures that the lens 1 is a corneal shaping lens that can be worn on the eyeball 2, and is round Curved surface and made of highly oxygen-permeable materials, the inner surface of the lens 1 is attached to the surface of the cornea 21 of the eyeball 2, and the center of the inner surface of the lens 1 includes a preset arc and penetrates the lens 1 and the cornea 21 tears (not shown in the figure) apply a positive pressure to the basal arc 11 (BC) on the surface of the cornea 21, and then a reverse arc 12 (RC), parallel to the outer side of the basal arc 11 Arc 13 (Alignment Curve) and side arc 14 (PC), and a center point 110 is formed at the center of the base arc 11, and a first intersection point 111 is formed at the intersection of the base arc 11 and the reversal arc 12, and the reversal arc A second intersection 121 is formed at the intersection of 12 and the parallel arc 13, and a third intersection 131 is formed at the intersection of the parallel arc 13 and the side arc 14.

The base arc 11 and the reversal arc 12 of the lens 1 are aspherical (that is, the eccentricity is non-zero).

Furthermore, the preset arc of the base arc 11 of the lens 1 is greater than the horizontal arc of the cornea 21 of the eyeball 2 (that is, the arc of the base arc 11 is flatter than the horizontal arc of the cornea 21), because the arc of the base arc 11 is greater than The curvature of the cornea 21, when the lens 1 is worn on the eyeball 2, the tear fluid between the base curve 11 and the cornea 21 can be used to produce the epithelial cells of the cornea 21. A positive pressure is generated; in addition, the reversal arc 12 of the lens 1 can store tears, and the negative pressure provided by the tears can achieve the effect of improving the positioning of the lens 1 on the eyeball 2.

The side arc 14 of the aforementioned lens 1 preferably has a slightly raised edge design, which can squeeze tears during blinking to promote the circulation of tears in the lens 1, and the lens 1 and the eyeball 2 can be made by the tear circulation. The cornea 21 is continuously lubricated and oxygen is brought in to improve the comfort and wearability during wearing.

When the present invention is actually used, the user can first put the lens 1 on the eyeball 2 and make the inner surface of the lens 1 contact the surface of the cornea 21 of the eyeball 2. At this time, the inner surface of the lens 1 and the cornea 21 There will be tears with uneven thickness. When the user blinks or goes to bed at night and closes the eyelid (not shown in the figure), the eyelid will press against the outer surface of the lens 1. At the same time, the eyelid and the lens The weight of 1 will generate a positive pressure, and the tear between the base curve 11 of the lens 1 and the cornea 21 exerts a positive pressure on the epithelial cells at the center of the cornea 21 surface of the eyeball 2, and the surface of the cornea 21 The epithelial cells are squeezed by the tear fluid to gradually make their central arcs become relatively flat, thereby making the central epithelial layer of the cornea 21 thinner, thereby reducing the refractive power of the cornea 21, so that the visual imaging point is toward the retina 22 of the eyeball 2 Move in the direction to achieve the effect of reducing or eliminating the degree of myopia.

Please refer to Figure 3 again, which is a data diagram of the distance between the lens of the present invention and the cornea. It can be clearly seen from the figure that the center point 110 of the base arc 11 of the lens 1 of the present invention and the cornea 21 of the eyeball 2 The straight-line distance is between 9μm~21μm, and the straight-line distance between the first intersection 111 between the base arc 11 and the reversal arc 12 and the cornea 21 of the eyeball 2 is between 89μm~189μm, which is due to the base arc 11 The linear distance between the center point 110 of the eyeball 2 and the cornea 21 of the eyeball 2 is between 9μm~21μm, so it can be derived from the experimental data It is known that the lens 1 can reduce the offset when the eyelid is closed, thereby improving the visual correction effect, and because the linear distance between the first intersection 111 and the cornea 21 of the eyeball 2 is between 89μm~189μm, it can be tested According to the data, when the eyelids are closed, the thickness of the tear fluid between the first intersection 111 and the cornea 21 of the eyeball 2 can effectively flatten the epithelial cells of the cornea 21, thereby achieving the effect of improving myopia control.

And the linear distance between the second intersection 121 between the reversal arc 12 and the parallel arc 13 of the lens 1 and the cornea 21 of the eyeball 2 is between 15 μm and 25 μm, because the base arc 11 and the reversal arc 12 of the lens 1 are It is aspherical, so the linear distance between the second intersection 121 and the cornea 21 of the eyeball 2 can be indeed between 15μm~25μm through this aspherical design, so as to improve the accuracy during manufacturing, and because of the lens 1 The base arc 11 is aspheric (non-zero eccentricity), so the eccentricity of the image screen imaged on the retina 22 of the eyeball 2 can be made non-zero, so as to increase the peripheral defocus area imaged on the retina 22, which is effective Control the speed of eye axis change (lengthening or shortening) to effectively control myopia or hyperopia, thereby achieving the effect of correcting myopia or hyperopia.

However, the third intersection 131 between the aforementioned parallel arc 13 and the side arc 14 is in contact with the surface of the cornea 21 of the eyeball 2. Since the lens 1 is in the shape of an arc, the closer the lens 1 is to the outer periphery, the larger the circumference. When the third point of intersection 131 is in contact with the surface of the cornea 21 of the eyeball 2, the contact is the most, so that when the eyelid of the lens 1 is closed, it is not easy to shake, thereby reducing the offset of the lens 1, thereby The accuracy of the squeezing can be improved to reliably squeeze the surface of the cornea 21.

The above are only the preferred embodiments of the present invention, which does not limit the scope of the patent of the present invention. Therefore, all simple modifications and etc. made by using the description and drawings of the present invention are given. All changes in the effective structure should be included in the scope of the patent of the present invention for the same reason, and shall be stated.

In summary, when the parallel arc structure of the orthokeratology lens of the present invention is actually applied and implemented, it can achieve its efficacy and purpose. Therefore, the present invention is a research and development with excellent practicability, and it is an application for invention patents. As for the essential requirements, Yan filed an application in accordance with the law, and I hope that the review committee will grant the approval of this case as soon as possible to protect the inventor’s hard research and development.

1: lens

11: base arc

110: Center point

111: First Node

12: Reverse arc

121: second intersection

13: Parallel arc

131: Third Node

14: Edge arc

Claims (6)

A keratoplasty lens has a parallel arc (Alignment Curve) structure. The lens is worn on the corneal surface of a predetermined eyeball, and includes a base arc at the center of the inner surface of the lens, and the outer side of the base arc faces sequentially There are reversal arcs, parallel arcs and side arcs on the outside, and a center point is formed at the center of the base arc, and a first intersection is formed at the intersection of the base arc and the reversal arc. A second intersection is formed at the intersection of the arcs, and a third intersection is formed at the intersection of the parallel arcs and the side arcs, and the linear distance between the center point of the base arc and the cornea of the predetermined eyeball is between 9μm and 21μm . The structure of the orthokeratology lens described in the scope of patent application in the Alignment Curve (Alignment Curve), wherein the eccentricity of the base arc of the lens is non-zero and the image screen eccentricity of the image on the retina of the predetermined eyeball Non-zero. For example, the orthokeratology lens described in item 1 of the scope of patent application has a parallel arc (Alignment Curve) structure, wherein the reversal arc of the lens is aspherical. The structure of the orthokeratology lens described in the first item of the scope of patent application in a parallel arc (Alignment Curve), wherein the second intersection point between the reversal arc and the parallel arc of the lens and the straight line of the cornea of the predetermined eyeball The distance is between 15μm and 25μm. For example, the orthokeratology lens described in item 1 of the scope of patent application has a parallel arc (Alignment Curve) structure, wherein the third intersection point between the parallel arc and the side arc is in contact with the corneal surface of the predetermined eyeball. As described in item 1 of the scope of patent application, the orthokeratology lens is in parallel arc (Ali gnment Curve), wherein the linear distance between the first intersection point between the base arc and the reversal arc and the cornea of the predetermined eyeball is between 89 μm and 189 μm.

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