TWI841471B - Contact lenses that slow down vision changes - Google Patents

Abstract

The present invention provides a contact lens capable of slowing down vision changes. The optical zone includes a vision correction zone that can enhance vision and a vision adjustment zone around the periphery of the vision correction zone. The vision correction zone can make the imaging beam approach parallel light The method passes through the central fossa on the retina of the eye to obtain clearer vision. When seeing more clearly, the pressure of the pressure ball can be relieved, and the image plane focused by the vision adjustment area is curved, which is different from the curvature of the retina of the eye. Then the change of myopic vision can be stabilized. The present invention adopts the above two methods to slow down the change of vision.

Description

Contact lenses that can slow down vision changes

The present invention relates to a contact lens capable of slowing down vision changes, particularly a contact lens for vision correction.

The main cause of myopia is the change in the optical structure of the eyeball. Due to the prevalence of various electronic, electrical, and 3C products, the age at which schoolchildren develop myopia has been decreasing year by year. As schoolchildren age, their eyeballs also continue to grow. When the eyeball grows excessively, the image falls in front of the retina, resulting in myopia.

People's eyes usually have positive spherical aberration, which makes the focal point outside the center of the retina usually fall behind the retina. When looking at close objects, the eyes often use the ciliary muscles to contract to make the lens more capable of focusing light, so that they can focus and see more clearly. Therefore, long-term use of the eyes for close objects will cause the ciliary muscles to be overused, and the eyeball will feel pressure. Myopic patients often have higher intraocular pressure, and higher intraocular pressure also forces the eye axis to lengthen, which is one of the possible causes of myopia.

In view of this, we have accumulated many years of experience in this field and have conducted careful research and continuous testing and improvement. Now we have finally invented a contact lens that can slow down vision changes, eliminate the shortcomings of conventional products, and enhance the effectiveness.

Therefore, the main purpose of the present invention is to provide a contact lens that can slow down vision changes, mainly to provide adequate vision correction within the retinal imaging angle of 5 degrees, and to increase the distance between the peripheral focal point and the retina in a continuous and gradual manner outside 5 degrees, thereby relieving eyeball pressure and achieving the effect of slowing down vision changes.

To achieve the above-mentioned purpose, the present invention provides a contact lens that can slow down vision changes. The contact lens includes an optical zone. The center of the optical zone is a vision correction zone that enhances vision. The vision correction zone mainly allows the focus of light to present a circle of confusion effect, which enables the imaging light beam to pass through the central fossa on the retina of the eye in a manner close to parallel light, so as to obtain clearer vision and relax the ciliary muscle of the eyeball. The periphery of the vision correction zone is a continuously changing vision accommodation zone. The image plane focused by the vision accommodation zone is arc-shaped. When the arc is different from the curvature of the retina and is in front of the retina, it can be used to stabilize the change of myopia vision. When it is behind the retina, it can be used to stabilize the change of hyperopia vision.

In order to allow the Honorable Review Committee to have a deeper understanding of this invention, Zzo uses diagrams to illustrate this creation in detail as follows:

(100):Contact lenses

(10):Optical area

(11): Vision correction area

(12): Visual adjustment area

(13): Front arc curve

(14): Backward arc curve

(15): Refractive index

(16): Center thickness

Figure 1: A schematic plan view of the contact lens of the present invention that can slow down vision changes.

Figure 2: A schematic diagram of the contact lens of the present invention that can slow down vision changes.

According to the contact lenses provided by the present invention, which can slow down vision changes, the refractive power distribution of the optical zone of the lens is mainly controlled to increase the range of the vision correction zone for the optical zone. Therefore, the present invention does not limit the refractive power distribution of the peripheral part. In practice, the peripheral vision adjustment zone can provide different optical designs according to product requirements.

Please refer to the first figure, the contact lens 100 of the present invention that can slow down vision changes includes an optical zone 10, the center of the optical zone 10 is a vision correction zone 11, the vision correction zone 11 is mainly used to make the focus of light present a circle of confusion effect, so that the imaging light beam can pass through the central fossa on the retina of the eye in a manner close to parallel light, so as to obtain clearer vision and achieve the effect of relaxing the ciliary muscle of the eyeball. The periphery of the vision correction zone 11 is a continuously changing vision accommodation zone 12, and the image plane focused by the vision accommodation zone 12 is arc-shaped. When the arc is different from the curvature of the retina of the eye and is in front of the retina, it can be used to stabilize the change of myopic vision. The vision correction zone 11 and the vision accommodation zone 12 have their own independent variable indexes that can be controlled separately. When controlling the degree of the vision correction zone 11, it will not affect the change of the degree of the vision accommodation zone 12.

According to the human eye, there is a depression less than two millimeters in the center of the retina, which is called the central fossa. It is located just opposite to the lens. There are densely clustered pyramidal cells in this depression. In addition to being responsible for the color vision of the human eye, the pyramidal cells are also the most sensitive to light and the place with the clearest vision. Whenever people focus on an object, their eyes will have a staring phenomenon, which is to project the image of the object to this position in order to obtain a clear image. The present invention considers that the central fossa is a depression, so the vision correction area 11 of the lens design center for enhancing vision must be able to cover the central fossa, and the light path passing through this area will also pass in a manner similar to parallel light. Unlike the light focusing on only one point, this method can ensure that the vision is fully corrected. Since the vision correction area 11 in the center of the lens is different from the vision accommodation area 12, the vision is enhanced without vision accommodation, so that the vision is fully corrected. When the eyeball can image more clearly, the ciliary muscle will no longer exert excessive force, thus achieving the effect of relieving intraocular pressure and preventing vision from deteriorating further.

Please refer to the second figure. According to the present invention, the front curve 13 of the vision correction zone 11 and the vision accommodation zone 12 in the center of the contact lens 100 with vision enhancement function can be obtained by using the ray tracing y-nu method of geometric optics and the quadratic equation that can describe the axially symmetric conical surface; wherein the four specifications that determine the refractive power of the lens are the front curve 13, the back curve 14, the refractive index 15 and the center thickness 16. After the specifications of the back curve 14, the refractive index 15 and the center thickness 16 of the contact lens 100 are determined, the power curve and the front and rear object distance range are set, and then the ray tracing y-nu method is used to repeatedly perform the refraction process (refracted porocedure) and transfer process (transfer porocedure) to obtain. Among them: refraction process

n'μ' = nμ + yc ( n' - n ) transfer process

二次方程式

Quadratic equation

cv=1/rd, rd is the radius of curvature

r ² = x ² + y ²

Since light is reversible, the relationship between the object and the image in the optical system is interchangeable. That is to say, if the image is regarded as the object, the image formed after the light passes through the system from right to left is the original object. Therefore, the present invention can determine the shape of the imaging surface, that is, the refractive power distribution curve plus the front and rear object distance, and then calculate the coordinate points on the front curve 13 of the contact lens 100 through the ray tracing and quadratic equation calculation of the above refraction process and transfer process.

In summary, the present invention is a contact lens that can slow down vision changes, comprising an optical zone, the center of which is a vision correction zone with enhanced vision. The vision correction zone mainly allows the focus of light to present a circle of confusion effect, which enables the imaging light beam to pass through the central fossa on the retina of the eye in a manner close to parallel light, so as to obtain clearer vision and achieve the effect of relaxing the ciliary muscle of the eyeball. The periphery of the vision correction zone is a continuously changing vision accommodation zone, and the image plane focused by the vision accommodation zone is arc-shaped. When the arc is different from the curvature of the retina of the eye and is in front of the retina, it can be used to stabilize the change of myopic vision. Its practical efficacy is beyond doubt, and this invention has never been made public or published in other publications, so it complies with the provisions of the Patent Law. Therefore, an invention patent application is filed in accordance with the law.

References: (or cited patents)

1. Effect of high add power, medium add power, or single vision contact lenses on myopia progression in children: the BLINK randomized clinical trial,” published August 11, 2020 in JAMA. DOI: 10.1001/jama.2020.10834

2. Wagner S, Conrad F, Bakaraju RC et al. Power profiles of single vision and multifocal soft contact lenses. Cont Lens Anterior Eye 2015;38:1 2-14.

(100):Contact lenses

(10):Optical area

(11): Vision correction area

(12): Visual adjustment area

Claims (1)

A contact lens capable of slowing down vision changes, the contact lens comprises an optical zone, the center of the optical zone is a vision correction zone, the vision correction zone mainly makes the focus of light present a circle of confusion The vision correction zone is a continuous variable vision accommodation zone. The image plane focused by the vision accommodation zone is arc-shaped. The arc is different from the curvature of the retina and can be used to stabilize the change of myopia vision when it is in front of the retina. The vision correction zone and the vision accommodation zone have their own independent variable indexes to control them separately. When controlling the degree of the vision correction zone, it will not affect the change of the degree of the vision accommodation zone.

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