TW202414043A - contact lenses - Google Patents

Abstract

A contact lens has an optical zone and a peripheral zone, wherein the optical zone is a circular zone with an imaginary central optical axis as the center, and the peripheral zone surrounds the outer periphery of the optical zone in an annular shape, and the refractive powers of the optical zone and the peripheral zone continuously change along the radial direction, wherein the refractive power in the circular zone with a diameter of 0.5mm to 8mm from the imaginary central optical axis has at least eight peaks in a degree change curve, and the difference between the highest refractive power and the lowest refractive power in the circular zone with a diameter of 0.5mm to 4mm from the imaginary central optical axis in the degree change curve presents a continuously increasing or continuously decreasing trend in the direction away from the imaginary central optical axis.

Description

Contact Lenses

The present invention relates to contact lenses, and in particular to contact lenses that can correct astigmatism, reduce myopia, and improve wearing comfort.

With the popularity of 3C products today, there is a trend of children and adolescents becoming myopic at younger and younger ages, which in turn increases the proportion of patients with high myopia, thereby increasing the risk of complications such as early-onset cataracts, glaucoma, retinal detachment, and macular degeneration.

Regarding vision problems, in addition to myopia and hyperopia, astigmatism often occurs together with nearsightedness and farsightedness. After light passes through the cornea, it will focus on the retina to produce an image. When light passes through the cornea, it cannot focus on a single focal point and produces multiple focal points, which is astigmatism, resulting in distorted, distorted, and blurred vision when looking at both near and far distances.

Astigmatism can be corrected by wearing hard contact lenses. However, hard contact lenses are made of poly (methyl methacrylate) (PMMA), which is harder than soft contact lenses. In addition, since the entire lens of hard contact lenses is made of a hard material, it is easy for the edge of the lens to contact the eye, which may cause discomfort to the eyes of first-time or infrequent users and require a long time to adapt. Therefore, improvements are needed.

In addition, existing myopia reduction or multi-focal products have problems such as image jumps, poor quality, and long adaptation time after wearing. Therefore, it is necessary to optimize the product brightness based on factors such as the brightness of the surrounding environment, near and far vision, etc. to improve the above problems.

In view of this, how to solve the above problems is the primary issue that the present invention intends to solve.

The main purpose of the present invention is to provide a contact lens that has the function of correcting astigmatism and reducing myopia, and the optical area of the lens is designed with zoom and defocus, and the material of the peripheral area is made of soft material, which has the effect of improving wearing comfort.

To achieve the above-mentioned purpose, the present invention provides a contact lens, which includes an optical zone and a peripheral zone, wherein the optical zone is a circular zone formed with an imaginary central optical axis as the center, and the peripheral zone surrounds the outer periphery of the optical zone in an annular manner, the elastic coefficient of the optical zone is higher than the elastic coefficient of the peripheral zone, and the refractive power of the optical zone and the peripheral zone is The optical zone has a circular area with a diameter of 0.5 mm to 4 mm from the imaginary central optical axis and a diopter having at least four peaks in the diopter change curve, and the difference between the highest diopter and the lowest diopter in the diopter change curve of the optical zone presents a continuously increasing or decreasing trend in the direction away from the imaginary central optical axis.

Preferably, the elastic coefficient of the optical zone is greater than or equal to 1.5 MPa.

Preferably, the elastic coefficient of the peripheral area is less than or equal to 0.8 MPa.

Preferably, the optical zone further includes an inner optical zone and an outer optical zone surrounding the inner optical zone, wherein the inner optical zone is within a circular area with a diameter of 0.5mm to 4mm from the imaginary central optical axis, and the difference between the highest diopter and the lowest diopter in the power change curve is between 0.25D and 4.0D; the outer optical zone is within a circular area with a diameter of 4mm to 8mm from the imaginary central optical axis, and the difference between the highest diopter and the lowest diopter in the power change curve is between 0.25D and 4.0D.

In another embodiment of the present invention, a contact lens is provided, which includes an optical zone and a peripheral zone. The optical zone is a circular zone with an imaginary central optical axis as the center. The peripheral zone surrounds the outer periphery of the optical zone in an annular manner. The optical zone includes an inner optical zone and an outer optical zone surrounding the outer periphery of the inner optical zone. The refractive powers of the inner optical zone and the outer optical zone continuously change along the radial direction. The difference between the highest refractive power and the lowest refractive power of the outer optical zone is between 4D and 12D.

The above-mentioned objects and advantages of the present invention can be more clearly understood from the detailed description and accompanying drawings of the following selected embodiments.

First, please refer to FIGS. 1 to 4, which are the first embodiment of the contact lens 1 provided by the present invention, which is composed of an optical area 10 and a peripheral area 20, wherein:

The optical zone 10 is a circular zone with an imaginary central optical axis L as the center, and the optical zone 10 is composed of an inner optical zone 11 and an outer optical zone 12 surrounding the inner optical zone 11. In this embodiment, the optical zone 10 can be made of polymethyl methacrylate (PMMA) to increase the hardness of the optical zone 10. The above materials are only listed and do not limit the present invention. The elastic coefficient of the optical zone 10 is greater than or equal to 1.5Mpa.

The peripheral region 20 extends outward from the outer periphery of the optical region 10 and is in a ring shape. In this embodiment, the peripheral region 20 can be made of a soft material such as hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA), a copolymer of methyl methacrylate (MMA) and hydroxyethyl glycerol acrylate, a hydrophilic hydrogel, or a hydrophobic silicone hydrogel. The above materials are merely listed and do not limit the present invention. The elastic coefficient of the peripheral region 20 is less than or equal to 0.8 Mpa and lower than the elastic coefficient of the optical region 10.

In this embodiment, the diameter of the optical area 10 is 0.5 mm to 8 mm, but in actual structural design, the diameter of the optical area 10 is not limited to the range of 0.5 mm to 8 mm and can be adjusted according to imaging quality or manufacturing technology. The diopter (D) of the inner optical area 11 and the outer optical area 12 changes continuously outward along the radial direction, wherein the diopter is the unit of refractive power. The optical zone 10 has at least eight peaks in the power variation curve within a circular area with a diameter of 0.5mm-8mm from the imaginary central optical axis L (as shown in Figures 4-7), and the difference (ADD) between the highest diopter and the lowest diopter in the power variation curve within a circular area with a diameter of 0.5mm-4mm from the imaginary central optical axis L of the optical zone 10 presents a continuous increasing or decreasing trend in the direction away from the imaginary central optical axis L, and the diopter presents a continuous undulating and gradual trend.

Furthermore, the inner optical zone 11 is within a circular area with a diameter of 0.5mm~4mm from the imaginary central optical axis L, and the ADD in the degree change curve is between 0.25D~4.0D. The outer optical zone 12 is within a circular area with a diameter of 4mm to 8mm from the imaginary central optical axis L, and the ADD in the degree change curve is between 0.25D~4.0D. The refractive power and focal length are negatively correlated to each other. Since the refractive power is continuously fluctuating and gradually changes to form a focal depth area in front of the retina 3, the focal lengths of different pupil positions are connected to form a focal depth. When the wearer switches to view objects at different distances, the depth of focus is changed into a continuous connection technology of the focus point, and the wearer's brain judges the distance, so that the wearer's ciliary muscles do not need to exert excessive force, thereby reducing the long-term tension and contraction of the ciliary muscles, and the target object is clearly imaged on the wearer's retina 3, so that the wearer does not cause visual jumps due to rapid changes in focal length, thereby avoiding the wearer's discomfort of dizziness.

As shown in Figure 2, astigmatism can be divided into regular astigmatism and irregular astigmatism. The shape of the eyeball of patients with regular astigmatism is generally elliptical, and the curvature of the eyeball is different in different directions. Some directions have a more curved curvature, and some directions have a flatter curvature. On the other hand, the surface of the cornea 4 of the eyeball of patients with irregular astigmatism is irregularly distorted or uneven, usually caused by scars on the cornea 4, or due to diseases such as conical keratoconus, corneal marginal degeneration, pterygium, etc. Therefore, after the light enters the eyeball, it does not focus on a single point, but produces multiple focal points, making the formed image blurred. Astigmatism can be better corrected by wearing contact lenses. As shown in FIG. 3 , through the optical design of the contact lens 1 provided by the present invention, the optical zone 10 has a high elastic coefficient and is not easily deformed and has a high hardness. The optical zone 10 of the contact lens 1 can fill the gap between the contact lens 1 and the surface of the eyeball with tears, just like a hard contact lens, so that the surface of the eyeball forms a spherical surface, thereby improving astigmatism.

Please refer to FIG. 4 , which is a distribution diagram of the power variation curve (Center Far) of the first embodiment of the contact lens 1 provided by the present invention for center far vision. In the first embodiment, the inner optical zone 11 is within a circular area with a diameter of 0.5 mm to 4 mm from the imaginary center optical axis L, and the ADD in the power variation curve is between 0.5D and 2.0D. The outer optical zone 12 is within a circular area with a diameter of 4 mm to 8 mm from the imaginary center optical axis L, and the ADD in the power variation curve is between 2.0D and 2.5D. The closer the optical zone 10 is to the imaginary center optical axis L, the greater the diopter and the smaller the ADD, so as to provide the wearer with good clarity when viewing distant objects.

In addition, since the ADD of the optical zone 10 shows a continuous gradual change trend in the direction away from the imaginary central optical axis L, the refractive power also shows a continuous fluctuating gradual change trend. When the wearer switches to view targets at different distances, the wearer's brain judges the distance to select the most appropriate refractive power, thereby achieving the effect of clearly imaging the target object on the wearer's retina 3, thereby preventing the wearer from experiencing dizziness and discomfort due to rapid changes in refractive power.

It should be particularly noted that, due to the high elastic coefficient of the optical zone 10, the hardness of the material of the optical zone 10 does not deform along with the curvature of the cornea 4, so that the optical zone 10 of the contact lens 1 can fill the gap between the contact lens 1 and the surface of the eyeball with tears, just like a hard contact lens, so that the surface of the eyeball forms a spherical surface, thereby achieving the purpose of improving astigmatism. In addition, the elastic coefficient of the peripheral zone 20 is lower and is softer and easier to deform, so that the contact lens 1 can be stably attached to the cornea 4, avoiding the contact lens 1 from slipping and causing discomfort to the wearer, thereby improving the wearing comfort.

Please refer to FIG. 5, which is a distribution diagram of the power variation curve for center vision of the second embodiment of the contact lens 1 provided by the present invention. Far), in the second embodiment, the inner optical zone 11 is within a circular area with a diameter of 0.5mm~4mm from the imaginary central optical axis L, and the ADD in the power change curve is between 0.5D~1.0D, the outer optical zone 12 is within a circular area with a diameter of 4mm to 8mm from the imaginary central optical axis L, and the ADD in the power change curve is between 0.25D~0.5D, and the closer the optical zone 10 is to the imaginary central optical axis L, the greater the refractive power and the greater the ADD, so as to provide the wearer with good visual quality when viewing near objects due to the reduction of the pupil, and at the same time have good clarity when viewing distant objects.

Please refer to FIG. 6, which is a distribution diagram of the power variation curve for near vision of the third embodiment of the contact lens 1 provided by the present invention (Center In the third embodiment, the inner optical zone 11 is within a circular area with a diameter of 0.5mm-4mm from the imaginary center optical axis L, and the ADD in the power change curve is between 0.5D and 1.0D. The outer optical zone 12 is within a circular area with a diameter of 4mm to 8mm from the imaginary center optical axis L, and the ADD in the power change curve is between 1.0D and 1.5D. The closer the optical zone 10 is to the imaginary center optical axis L, the smaller the diopter and the ADD are, so as to provide the wearer with good clarity when viewing near objects, and maintain basic visual requirements when viewing distant objects.

Please refer to FIG. 7, which is a distribution diagram of the power variation curve for near vision of the fourth embodiment of the contact lens 1 provided by the present invention (Center In the fourth embodiment, the inner optical zone 11 is within a circular area with a diameter of 0.5mm-4mm from the imaginary center optical axis L, and the ADD in the degree change curve is between 0.25D and 1.0D. The outer optical zone 12 is within a circular area with a diameter of 4mm to 8mm from the imaginary center optical axis L, and the ADD in the degree change curve is between 0.25D and 0.5D. The closer the optical zone 10 is to the imaginary center optical axis L, the smaller the diopter and the larger the ADD, so as to provide the wearer with a focal depth area when viewing near objects, and the function of adjusting the visual image by focusing when viewing different distances, thereby having better clarity.

The second, third and fourth embodiments are similar to the first embodiment in that the optical zone 10 has a high elastic coefficient and is not easily deformed, so that the optical zone 10 of the contact lens 1 can fill the gap between the contact lens 1 and the surface of the eyeball with tears, just like a hard contact lens, to improve astigmatism. The elastic coefficient of the peripheral zone 20 is relatively low, so that the contact lens 1 can be stably attached to the cornea 4, avoiding the contact lens 1 from slipping and causing discomfort to the wearer, and also having the effect of improving wearing comfort.

Please refer to FIG. 8, which is a distribution diagram of the diopter variation curve of the fifth embodiment of the contact lens 1 provided by the present invention. The difference between the fifth embodiment and the first embodiment is that in the fifth embodiment, the diopter extending from the inner optical zone 50 to the outer optical zone 60 further adopts a design of focal depth and gradual defocusing. The diopter of the inner optical zone 50 and the outer optical zone 60 is a trend of continuous and gradual increase in the radial direction, and the difference (ADD) between the highest diopter and the lowest diopter of the outer optical zone 60 is between 4D and 1. 2D, whereby the average refractive power of the outer optical zone 60 is greater than the average refractive power of the inner optical zone 50, so as to generate myopic defocus, so that the target object is imaged in front of the retina 3 through the optical zone to form a focal depth, and myopic defocus is formed in front of the periphery of the retina 3, so that when looking at close objects, the focus is automatically adjusted due to the design of the focal depth, thereby reducing the long-term tension of the ciliary muscle, so as to avoid the problem of the eyeball tracking focus due to the peripheral hyperopic defocus, resulting in the deepening of the degree, and thus having the effect of slowing down the growth of myopia.

In addition, in the second embodiment, the elastic coefficient of the optical zone is greater than or equal to 1.5 MPa, and the elastic coefficient of the peripheral zone is less than or equal to 0.8 MPa, thereby achieving the same function as the first embodiment and having the effect of improving astigmatism and enhancing wearing comfort.

The disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention. Therefore, any change in numerical values or replacement of equivalent elements should still fall within the scope of the present invention.

In summary, it should be possible for those familiar with the art to understand that the present invention can indeed achieve the aforementioned purpose and is in compliance with the provisions of the Patent Law, and therefore an application can be filed in accordance with the law.

1: Contact lens 10: Optical zone 11: Inner optical zone 12: Outer optical zone 20: Peripheral zone 3: Retina 4: Cornea 50: Inner optical zone 60: Outer optical zone L: Imaginary central optical axis

Figure 1 is a schematic diagram of the contact lens of the present invention. Figure 2 is a schematic diagram of the imaging state of an astigmatism patient. Figure 3 is a schematic diagram of the imaging state of an astigmatism patient wearing the present invention. Figure 4 is a distribution diagram of the degree change curve of the diopter of the first embodiment of the present invention. Figure 5 is a distribution diagram of the degree change curve of the diopter of the second embodiment of the present invention. Figure 6 is a distribution diagram of the degree change curve of the diopter of the third embodiment of the present invention. Figure 7 is a distribution diagram of the degree change curve of the diopter of the fourth embodiment of the present invention. Figure 8 is a distribution diagram of the degree change curve of the diopter of the fifth embodiment of the present invention.

10: Optical area

11: Inner Optical Area

12: Outdoor Optics Area

20: Peripheral area

3: Retina

4: Cornea

L: imaginary center optical axis

Claims (8)

A contact lens comprises an optical zone and a peripheral zone, wherein the optical zone is a circular zone with an imaginary central optical axis as the center, and the peripheral zone surrounds the outer periphery of the optical zone in an annular shape, and the diopter of the optical zone and the peripheral zone changes continuously in the radial direction, wherein the diopter of the optical zone in a circular zone with a diameter of 0.5mm to 8mm from the imaginary central optical axis has at least eight peaks in a degree change curve, and the difference between the highest diopter and the lowest diopter of the optical zone in a circular zone with a diameter of 0.5mm to 4mm from the imaginary central optical axis in the degree change curve presents a continuously increasing or decreasing trend in the direction away from the imaginary central optical axis. The contact lens as claimed in claim 1, wherein the elastic coefficient of the optical zone is higher than the elastic coefficient of the peripheral zone. A contact lens as described in claim 2, wherein the elastic coefficient of the optical zone is greater than or equal to 1.5 MPa, and the elastic coefficient of the peripheral zone is less than or equal to 0.8 MPa. The contact lens as claimed in claim 1, wherein the optical zone is made of poly (methyl methacrylate) (PMMA). The contact lens as described in claim 1, wherein the optical zone further includes an inner optical zone and an outer optical zone surrounding the inner optical zone, wherein the difference between the highest diopter and the lowest diopter in the power change curve of the inner optical zone is between 0.25D and 4.0D within a circular area with a diameter of 0.5mm to 4mm from the imaginary central optical axis; and the difference between the highest diopter and the lowest diopter in the power change curve of the outer optical zone is between 4mm and 8mm from the imaginary central optical axis. A contact lens comprises an optical zone and a peripheral zone, wherein the optical zone is a circular zone with an imaginary central optical axis as the center, and the peripheral zone surrounds the outer periphery of the optical zone in an annular shape, and the optical zone comprises an inner optical zone and an outer optical zone surrounding the outer periphery of the inner optical zone, wherein the refractive power of the inner optical zone and the outer optical zone continuously changes along the radial direction, and the difference between the highest refractive power and the lowest refractive power of the outer optical zone is between 4D and 12D. A contact lens as described in claim 6, wherein the elastic coefficient of the optical zone is higher than the elastic coefficient of the peripheral zone. A contact lens as described in claim 7, wherein the elastic coefficient of the optical zone is greater than or equal to 1.5 MPa, and the elastic coefficient of the peripheral zone is less than or equal to 0.8 MPa.

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