TWM603972U - Design structure of orthokeratology film in the reverse arc - Google Patents

Abstract

This creation is about the design structure of a reversing arc of a corneal plastic lens. The center of the inner surface of the lens includes a base arc, and the outer side of the base arc is provided with a reverse arc, a matching arc, and a side arc in sequence. The intersection of the base arc and the reversal arc is formed with a straight-line distance between 89μm and 189μm with the cornea. Because the straight-line distance between the intersection and the cornea is between 89μm and 189μm, compared with ordinary orthokeratology lenses, Can provide more myopia peripheral defocus, thereby enhancing the effect of myopia control.

Description

The design structure of the orthokeratology film in the reverse arc

This creation is about the design structure of an orthokeratology lens in the reversal arc, especially the distance between the base arc and the intersection of the reversal arc of the lens and the cornea is between 89~189μm, so when the eyelid is closed, compared to Ordinary orthokeratology lenses can provide more near-sighted peripheral defocus, thereby enhancing the effect of myopia control.

By the way, 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, and has led to the popularization of applications in communications and the Internet. 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, and then the phenomenon of bowing people is derived, and therefore many People’s eyesight loss and injuries are getting worse, and the myopia population is relatively increasing.

Furthermore, the reason why people have myopia is caused by the mismatch between the tortuosity of the eye 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. 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. .

At present, the main ways to correct refractive errors are to wear glasses to correct and wear invisible There are several methods of lens correction, corneal myopia surgery or wearing orthokeratology. Each of the above methods has its advantages and disadvantages. Here, the research is especially aimed at orthokeratology. Among them, the orthokeratology is made of high permeability. Made of oxygen-hard material, when the lens is worn on the eyeball, a layer of unevenly distributed tear fluid will be sandwiched between the lens and the outer surface of the cornea of the eyeball, and the positive pressure exerted by the tear fluid on the cornea can reduce The epithelial cells are squashed, and 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 wear time is sufficient, the central curvature of the cornea can be gradually increased. Flatten and gradually thin the central epithelial layer to flatten the center of the cornea, thereby reducing the refractive power of the cornea, thereby achieving the effect of correcting myopia and even returning to normal vision.

However, the general low-degree (between 50 and 400 degrees) corneal shaping tablets have poor myopia control effects. In order to understand the reasons, the experimenters repeated experiments to obtain the experimental data in Figure 4, which is the conventional tear thickness analysis. From the data chart, it can be clearly seen that the tear thickness of the corneal shaping sheet with curvature 39, 42 and 46 at myopia 500, 700, and 900 degrees is above 90μm. This is due to the low degree of myopia, which is 500 degrees. The orthokeratology lens can provide more defocus degrees of myopia to effectively control myopia. However, the current base curve of the orthokeratology lens is spherical, so at low power, the base curve of the orthokeratology lens is matched with a The space formed by the reversal arc on the side for the accumulation of tears will be insufficient, resulting in low-degree corneal shaping tablets that cannot effectively control myopia.

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

Therefore, in view of the above-mentioned deficiencies, the creators have collected relevant information through various Evaluation and consideration, and with years of experience in this industry, through continuous trials and modifications, he designed the new type of patent for the design and structure of the reversal arc of the orthokeratology sheet.

The main purpose of this creation is that the center of the inner surface of the lens includes a base arc, and the outer side of the base arc is provided with a reversal arc, a matching arc, and a side arc in sequence outwards, and the center of the base arc forms a center point And the intersection is formed at the intersection of the base arc and the reversal arc, and the straight-line distance between the intersection and the cornea is between 89μm and 189μm. Because the straight-line distance between the intersection and the cornea is between 89μm and 189μm, so When the eyelids are closed, compared to ordinary corneal shaping lenses, it can provide more myopia peripheral defocus, thereby achieving the purpose of improving myopia control effect.

The secondary purpose of this creation is that the base curve of the lens is aspherical, so 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 imaged on the retina, which is effective Control the speed of changes in the eye axis, thereby effectively controlling myopia, thereby achieving the purpose of correcting myopia.

1: lens

11: base arc

111: Intersection

12: Reverse arc

13: fit arc

14: Edge arc

2: eyeball

21: Cornea

22: Retina

[Picture 1] is a cross-sectional side view of this creation.

[Picture 2] is a schematic diagram of the light path of this creation.

[Picture 3] is a data diagram of the distance between this creative lens and the cornea.

[Figure 4] is a data diagram of conventional tear thickness analysis.

In order to achieve the above-mentioned purpose and effect, the technical means and structure used in this creation are described in detail below with the preferred embodiment of this creation, for the benefit of a complete understanding.

Please refer to Figures 1, 2 and 3, which are the side-view cross-sectional diagrams, schematic diagrams of the light path and the data diagram of the distance between the lens and the cornea of this creation. It can be clearly seen from the diagram that the lens 1 is suitable for wearing The corneal shaping sheet on the eyeball 2 is arc-shaped and 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, and is at the center of the inner surface of the lens 1 Including the base curve 11 (BC) that has an eccentricity between 0 and 4 and passes through the tear fluid (not shown in the figure) between the lens 1 and the cornea 21 to apply a positive pressure on the surface of the cornea 21, and then the base curve 11 is provided with a reversing arc 12 (RC), a matching arc 13 (AC) and a side arc 14 (PC) in sequence outwards, and the intersection of the base arc 11 and the reversing arc 12 forms an intersection 111, and the The linear distance between the intersection 111 between the base arc 11 and the reversal arc 12 and the cornea 21 of the eyeball 2 is between 89 μm and 189 μm.

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 arc 11 and the cornea 21 can generate a positive pressure on the epithelial cells of the cornea 21; in addition, the lens 1 is reversed The arc 12 is used for storing tear fluid, and the negative pressure provided by the tear fluid 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 tear circulation. The cornea 21 is continuously lubricated and oxygen is brought into it to improve the comfort and wearability during wearing.

When the lens 1 of this creation is produced, the eccentricity of the base curve 11 of the lens 1 can be between 0 and 4 through the preset processing machine, so as to use the base curve with the eccentricity between 0 and 4 11 to make the straight line distance between the intersection 111 and the cornea 21 of the eyeball 2 be between 89μm~189μm, and when the original creation is actually worn, the user can first put the lens 1 on the eyeball 2. The inner surface of the lens 1 is brought into contact with the surface of the cornea 21 of the eyeball 2. At this time, tears of uneven thickness will be generated between the inner surface of the lens 1 and the cornea 21. When the user goes to bed at night, the eyelids (not shown in the figure) When the eyelid is closed, the eyelid will press against the outer surface of the lens 1. At the same time, the weight of the eyelid and the lens 1 will generate a positive pressure, and the contact between the base curve 11 of the lens 1 and the cornea 21 Tear fluid exerts a positive pressure on the epithelial cells at the center of the cornea 21 surface of the eyeball 2, and the epithelial cells on the surface of the cornea 21 are squeezed by the tear fluid to make the central curvature gradually become relatively flat, thereby making the cornea 21 upper center The cortex becomes thinner, thereby reducing the refractive power of the cornea 21, so that the visual imaging point moves toward the retina 22 of the eyeball 2, so as to achieve the effect of reducing or eliminating myopia.

And the linear distance between the intersection 111 between the base arc 11 and the reversal arc 12 and the cornea 21 of the eyeball 2 is between 89μm~189μm, so when the eyelid is closed, it can provide more than ordinary orthokeratology lenses. More myopia peripheral defocus, which can achieve the effect of improving myopia control.

Furthermore, the base curve 11 of the lens 1 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 periphery of the image on the retina 22 The defocus area effectively controls the speed of eye axis change, thereby effectively controlling myopia, thereby achieving the effect of correcting myopia.

The above is only a preferred embodiment of this creation, and it is not limited to this creation. Therefore, all simple modifications and equivalent structural changes made by using this creation specification and schematic content shall be included in the patent scope of this creation in the same way and shall be stated.

In summary, the design structure of the reversal arc of the corneal shaping sheet of this creation can indeed achieve its efficacy and purpose when it is actually applied and implemented. Therefore, this creation is a research and development with excellent practicality and is in line with new patents. For the application requirements, Yan submits an application in accordance with the law. I hope that the review committee will grant the approval of this case as soon as possible to protect the creators’ hard research and development and creation. If the review committee of the bureau has any doubts, please feel free to write instructions, and the creators will do their best to cooperate. Poop.

1: lens

11: base arc

111: Intersection

12: Reverse arc

13: fit arc

14: Edge arc

Claims (3)

A design structure of a reversing arc of a corneal shaping lens. The lens is worn on the corneal surface of the predetermined eyeball and includes a base arc with an eccentricity between 0 and 4 at the center of the inner surface of the lens. The outer side of the arc is provided with a reversal arc, a suitable arc and a side arc in sequence, and the base arc and the reversal arc form an intersection, and the intersection between the base arc and the reversal arc is a straight line between the cornea of the preset eyeball The distance is between 89μm and 189μm. For example, the design structure of the orthokeratology lens in the reversal arc of the scope of patent application, wherein the base arc eccentricity of the lens is non-zero and the eccentricity of the image screen imaged on the retina of the preset eyeball is non-zero. For example, the design structure of the reversal arc of the orthokeratology lens described in the scope of the patent application, wherein the reversal arc of the lens is aspherical.

Images