TWI754991B - Multi-arc and multi-segment orthokeratology contact lens positioning structure and method - Google Patents

Abstract

The present invention relates to a multi-arc and multi-segment orthokeratology contact lens positioning structure and method. The center of the inner surface of the lens includes a base arc, and the outer side of the base arc is provided with an inversion arc facing outward, and the inversion arc is The outer side is provided with a matching arc positioned on the cornea of the eyeball, and then the outer side of the matching arc is provided with a side arc, and the area on the surface of the cornea that is in contact with the matching arc forms a positioning area, and in the positioning area Divided into a plurality of blocks, and a plurality of positioning blocks corresponding to the curvature values of the plurality of blocks in the positioning area are formed in the fitting arc corresponding to the positions of the plurality of blocks, and the complex positioning blocks of the fitting arc are in line with the cornea. So that the lens can be stably positioned on the eyeball, so when the wearer's eyelid is closed, the lens is not prone to axial rotation and inaccurate alignment, so that the base arc of the lens can indeed exert pressure. On the corneal surface of the eyeball, it can achieve the effect of improving and reducing the degree of myopia or eliminating the stability of the degree of myopia.

Description

Multi-arc and multi-segment orthokeratology contact lens positioning structure and method

The present invention relates to a multi-arc and multi-segment orthokeratology contact lens positioning structure and method, especially that the multiple positioning blocks of the matching arc of the lens are in line with the curvature value of the cornea, so that the lens can be stably positioned on the eyeball , so that the lens is not prone to axial rotation and inaccurate alignment, so that the base arc of the lens is indeed squeezed on the corneal surface of the eyeball.

Press, with the development and innovation of various electronic and electrical products, it has brought people a lot of convenience in daily life and work, especially the advent of a large number of electronic products, which has also led to the popularization of applications in communications and the Internet, so that many People are immersed in the use of electronic products, and a large number of electronic products are used for a long time, whether it is office workers, students, or middle-aged and elderly people, covering a wide range, which leads to the phenomenon of bow-headed people, which has created many People's eyes vision impairment, injury and other conditions are becoming more and more serious, and the population of myopia is relatively increased.

Furthermore, myopia occurs due to the mismatch between the eye's ability to bend light and the length of the eye. It may be that the eye axis is too long or the corneal arc is too steep, causing the visual imaging point to fall in front of the retina. Causes blurring of vision during imaging. Therefore, in order to correct myopia, it is necessary to reduce the bending ability of the eye light. Since the corneal light bending ability accounts for about 80% of the entire eye, it is only necessary to reduce the refractive power of the cornea to achieve the effect of correcting myopia. .

At present, the main methods of correcting refractive errors include wearing glasses to correct and wear contact lenses. There are several methods such as lens correction, corneal myopia surgery, or wearing orthokeratology sheets. The above methods have their own advantages and disadvantages. Here, we especially study the orthokeratology sheets. It is made of oxygen-hard material. When the lens is worn on the eyeball, a layer of unevenly distributed tears will be sandwiched between the lens and the outer surface of the cornea of the eyeball. Epithelial cells are squashed. At the same time, if the wearer uses the eyelid to close the eye, it will exert a certain pressure on the cornea by the weight of the eyelid and the lens. If the wearing time is sufficient, the central curvature of the cornea can be gradually made Flattening and thinning of the central epithelium gradually flatten the center of the cornea, thereby reducing the refractive power of the cornea, thereby achieving the effect of correcting myopia and even restoring normal vision.

However, the corneal surface of the general eye is not a complete and smooth curved surface, so when the orthokeratology sheet is worn on the eye, it is prone to rotation or misalignment. When a certain pressure is applied, the squeeze will be inaccurate, resulting in the inability to correct the power and return to the normal vision state.

Therefore, how to solve the above-mentioned deficiencies and inconveniences is the direction of research and improvement that the relevant practitioners in this industry are eager to study and improve.

Therefore, in view of the above-mentioned deficiencies, the inventor collected relevant information, evaluated and considered from various parties, and based on years of experience accumulated in this industry, through continuous trial production and modification, before designing this kind of multi-arc and multi-segment corneal plastic surgery. The inventor of the structure and method of positioning contact lens.

The main object of the present invention is that the center of the inner surface of the lens includes a base arc that applies a positive pressure on the corneal surface through the tear fluid between the lens and the cornea of the eyeball, and A reversal arc is arranged on the outside of the base arc, and a fitting arc positioned on the cornea is arranged on the outside of the reversal arc, and a side arc is arranged on the outside of the fitting arc, and the surface of the cornea is aligned with the fitting arc. The contact area is formed with a positioning area, and a plurality of blocks are divided in the positioning area, and a plurality of positioning blocks corresponding to the curvature values of the plurality of blocks in the positioning area are formed in the fitting arc corresponding to the positions of the plurality of blocks, Because the multiple positioning blocks of the matching arc are in line with the curvature value of the cornea, so that the lens can be stably positioned on the eyeball, so when the wearer's eyelid is closed, the lens is not prone to axial rotation and inaccurate alignment. Therefore, the tear fluid between the base arc of the lens and the cornea can indeed exert a positive pressure on the corneal surface of the eyeball, so as to achieve the purpose of improving and reducing the degree of myopia or eliminating the stability of the degree of myopia.

1: Lens

11: base arc

12: reverse arc

13: Fitting Arc

131: Locate block

14: Edge Arc

2: Eyeball

21: Cornea

211: Positioning area

2111: block

[Fig. 1] is a top sectional view of the lens of the present invention.

[Fig. 2] is a schematic diagram of the eyeball of the present invention.

[Fig. 3] is a flow chart of the present invention.

In order to achieve the above objects and effects, the technical means and structures adopted by the present invention are described in detail with reference to the preferred embodiments of the present invention, and the features and functions are as follows, so as to be fully understood.

Please refer to Figures 1, 2 and 3, which are top sectional views of the lens of the present invention, schematic diagrams and flow charts of the eyeballs. It can be clearly seen from the figures that the lens 1 is a corneal plastic that can be worn on the eyeball 2. The lens 1 has a circular arc surface shape and is made of high oxygen permeability material. 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 transparent lens 1 and a The tear fluid (not shown) between the cornea 21 exerts a positive pressure on the cornea 2 1. The base arc 11 (BC) on the surface, and the outer side of the base arc 11 is sequentially provided with a reverse arc 12 (RC), and the outer side of the reverse arc 12 is provided with a matching arc 13 positioned on the cornea 21. (AC), and then a side arc 14 (PC) is provided on the outside of the matching arc 13, and a positioning area 211 is formed on the surface of the cornea 21 in contact with the matching arc 13, and the positioning area 211 is divided into a plurality of Block 2111, and the position corresponding to the complex block 2111 in the adaptation arc 13 is formed with an even number (eg 2, 4, 6, 8, 10 or 12) and a complex number that conforms to the curvature value of the complex block 2111 Locate block 131.

Furthermore, the preset arc of the base arc 11 of the above-mentioned 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, can generate a positive pressure on the epithelial cells of the cornea 21 through the tear fluid between the base arc 11 and the cornea 21; in addition, the inversion of the lens 1 The arc 12 is used for storing tear fluid, and the effect of positioning the lens 1 on the eyeball 2 can be enhanced by the negative pressure provided by the tear fluid.

The edge arc 14 of the above-mentioned lens 1 is preferably designed with a slightly raised edge, which can squeeze tears during blinking, so as to promote the circulation of tears in the lens 1. The cornea 21 is continuously lubricated and oxygen is brought in to improve wearing comfort and wearability.

Moreover, the radian of the fitting arc 13 of the above-mentioned lens 1 at the side adjacent to the nose is smaller than the radian on the opposite side of the nose.

In addition, the inner surface of the above-mentioned lens 1 is aspherical.

When the lens 1 of the present invention is actually manufactured, it may include the following steps:

(A) The cornea 21 of the eyeball 2 can be measured first through a corneal map, to obtain complex radian values in the cornea 21 .

(B) and use the electronic device to calculate the curvature value of the cornea 21 of the eyeball 2. The positioning area 211 of the cornea 21 that conforms to the fitting arc 13 of the lens 1 to be produced is firstly divided into a plurality of blocks 2111, and by A preset algorithm is used to calculate the complex radian value of the cornea 21 in each block 2111 into a curvature value.

(C) The lens 1 is then manufactured according to the curvature values of the plurality of blocks 2111 through the lens making machine, so that the fitting arc 13 of the lens 1 is formed with a plurality of positioning blocks 131 corresponding to the curvature values of the plurality of blocks 2111, Then, the manufacture of the lens 1 is completed.

How the corneal map instrument in the above step (A) measures the cornea 21 of the eyeball 2 to obtain the complex number of radians in the cornea 21 is within the scope of the known technology, so the internal electronic components and circuit design are not required to be a separate one. Repeat for understanding.

Furthermore, the electronic device in the above step (B) can be a desktop computer, a notebook computer, an industrial computer or other electronic devices with computing functions.

And the electronic device in the above-mentioned step (B) can divide the positioning area 211 of the cornea 21 into eight blocks 2111. In the process of dividing, the positioning area 211 of the cornea 21 can be divided into the X and Y axes first. Divide it into four blocks 2111, and then divide the four blocks with a 45° angle, and then divide the positioning area 211 into eight blocks 2111, so that the lens 1 can be matched with the eight blocks 2111. The suitable arc 13 forms eight positioning blocks 131 , and the eight positioning blocks 131 can be used to improve positioning.

However, the electronic device in the above step (B) can first use the center point of the cornea 21 of the eyeball 2 as the origin (0, 0) of the coordinate system (X, Y), and the preset algorithm can be the following formula :

Wherein, z represents the distance between the Y direction and the origin, c represents the curvature of the center of the cornea 21 , r represents the distance between the X direction and the origin of the coordinates, k represents asphericity, and k=-e ² , and e is the centrifugal force Rate.

In addition, the lens manufacturing machine in the above step (C) can be an aspherical surface manufacturing machine, so as to use the aspherical surface manufacturing method to manufacture the lens 1. However, there are many devices and components inside the lens manufacturing machine, which is not the case in this case. The key points of the invention will not be repeated for the sake of understanding.

When the present invention is actually worn and used, the fitter can first measure the cornea 21 of the wearer's eyeball 2 through a corneal map to obtain the complex radian value in the wearer's cornea 21. The corneal map The complex radian value will be transmitted to the electronic device. At this time, the fitting person can use the electronic device to calculate the curvature value, so that the positioning area 211 in the cornea 21 conforms to the fitting arc 13 of the lens 1 to be produced. A plurality of blocks 2111 are formed, and a preset algorithm is used to calculate the complex radian value of the cornea 21 in each block 2111 into a curvature value, and the electronic device will transmit the complex curvature value of the cornea 21 to the lens making machine. and the lens making machine will manufacture the lens 1 according to the curvature values of the plurality of blocks 2111, so that the fitting arc 13 of the lens 1 is formed with a plurality of positioning blocks 131 corresponding to the curvature values of the plurality of blocks 2111, and The wearer can wear the manufactured 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 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, so when the wearer goes to bed at night and closes the eyelid (not shown in the figure), the Lens 1 is not prone to axial rotation and inaccurate alignment Therefore, the tear fluid between the base arc 11 of the lens 1 and the cornea 21 can indeed exert a positive pressure on the epithelial cells in the center of the surface of the cornea 21 of the eyeball 2, and the epithelial cells on the surface of the cornea 21 are squeezed by the tear fluid. The central radian will gradually become relatively flat, thereby thinning the central epithelial layer of the cornea 21, thereby reducing the refractive power of the cornea 21, so that the imaging point of the visual object moves in the direction of the retina (not shown in the figure) of the eyeball 2 , so as to achieve the effect of improving the stability of reducing the degree of myopia or eliminating the degree of myopia.

The above description is only a preferred embodiment of the present invention, which does not limit the scope of the patent of the present invention. Therefore, any simple modifications and equivalent structural changes made by using the contents of the description and drawings of the present invention should be similarly included in the Within the scope of the patent of the present invention, it is hereby stated.

To sum up, the multi-arc and multi-segment orthokeratology contact lens positioning structure and method of the present invention can achieve its efficacy and purpose in practical application and implementation. Therefore, the present invention is a research and development with excellent practicability. In order to meet the application requirements for an invention patent, we should file an application in accordance with the law. We hope that the review committee will approve this case as soon as possible to protect the inventor's hard work in research and development. Cooperation is a real virtue.

1: Lens

11: base arc

12: reverse arc

13: Fitting Arc

131: Locate block

14: Edge Arc

Claims (7)

A method for positioning a multi-arc and multi-segment orthokeratology contact lens, comprising the following steps: (A) measuring the cornea of the eyeball through a corneal map to obtain the complex radian value in the cornea; (B) And use the electronic device to calculate the curvature value of the cornea of the eyeball. The positioning area in the cornea that meets the matching arc of the lens to be produced is first divided into a plurality of blocks, and a preset algorithm is used to divide each block. The complex radian value of the cornea is calculated as a curvature value; (C) the lens is produced by the lens making machine according to the curvature values of the complex blocks, so that the matching arc of the lens is formed with the curvature value of the complex block. Plural positioning blocks. The method for positioning a multi-arc and multi-segment orthokeratology contact lens according to claim 1, wherein the electronic device in the step (B) is a desktop computer, a notebook computer or an industrial computer. The method for positioning a multi-arc and multi-segment orthokeratology contact lens according to claim 1, wherein the number of the positioning blocks of the matching arc in the step (B) is an even number. The positioning method of a multi-arc and multi-segment orthokeratology contact lens according to claim 1, wherein the curvature of the fitting arc of the lens adjacent to the side of the predetermined nose is smaller than the curvature of the opposite side of the nose. The method for positioning a multi-arc and multi-segment orthokeratology contact lens according to claim 1, wherein the electronic device in step (B) is to divide the positioning area of the cornea into eight blocks , in the process of division, the positioning area of the cornea is first divided into four blocks by the X and Y axes, and then divided by the 45° angle in the four blocks, and then the positioning area is divided into eight blocks, The fitting arc of the lens forms eight positioning blocks by means of eight blocks, and the eight positioning blocks are used to improve the positioning. The method for positioning a multi-arc and multi-segment orthokeratology contact lens according to claim 1, wherein the electronic device in step (B) firstly takes the corneal center point of the eyeball as the origin of the X, Y coordinate system, and The preset algorithm can be the following formula:

, where z is the distance between the Y direction and the origin, c is the corneal center curvature, r is the distance between the X direction and the coordinate origin, k is the asphericity, and k=-e ² , and e is the eccentricity. The method for positioning a multi-arc and multi-segment orthokeratology contact lens according to claim 1, wherein the lens making machine in the step (C) is an aspherical surface manufacturing machine, so as to use the aspherical surface manufacturing method to make the lenses .

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