TWI783809B - Myopia Control Contact Lenses - Google Patents

Abstract

A contact lens for myopia control, which defines an optical zone and a ring-shaped light-shielding zone, wherein the optical zone includes a central portion with a diameter of less than 3 mm, which has a constant diopter P ₁ ; a focal point surrounding the central portion In the deep part, the minimum diameter of the inner ring is 1 mm, and the maximum diameter of the outer ring is 7 mm. The diopter system changes continuously along the radial direction, and the highest diopter is P ₂ , which satisfies 0.25 ≦ P ₂ - P ₁ ≦ 4; and a surrounding In the out-of-focus part outside the depth of focus, the minimum diameter of the inner ring is 3 mm, and the maximum diameter of the outer ring is 10 mm. The diopter system changes continuously along the radial direction, and the highest diopter is P ₃ , which satisfies 3 ≦ P ₃ - P ₁ ≦20. In addition, the diameter of the inner circle of the shading area is between 3mm and 6mm, and the diameter of the outer circle is between 7mm and 15mm.

Description

Myopia Control Contact Lenses

The invention relates to a vision correction device, especially a contact lens.

Myopia is one of the diseases of modern civilization. Especially after the popularization of TV, computer and 3C technology products, the number of myopia patients has also increased. As shown in Figure 10A, the front end of the eyeball 9 has a lens 91 and the rear end has a retina 92. The lens 91 is pulled by the ciliary muscle 93 to change its shape, thereby adjusting the imaging position of the object. When the eye's visual function is normal, the ciliary muscle 93 pulls the lens 91 into an appropriate shape, so that the image of the object is correctly projected on the retina 92, so that the object can be seen clearly. It is generally believed that the cause of myopia lies in staring at near objects for a long time, the ciliary muscle 93 in the eyeball 9 continues to contract and cannot return to a relaxed state, and the lens 91 is controlled by the contracted ciliary muscle 93 to thicken, resulting in the object image as The image shown in Fig. 10B is not projected on the retina 92, but is in front of it, so that the objects cannot be seen clearly.

The above-mentioned myopia problem can be improved by wearing myopia glasses. As shown in Figure 10C, the lens 94 of the myopia glasses is a concave lens, which can adjust the angle at which light enters the eyeball 9, so that the image of the object is projected on the retina 92 in a corrected manner, so that it can be seen clearly. According to the severity of the myopia problem, that is, the ability of the ciliary muscle 93 to adjust the shape of the lens 91, the lens 94 is ground to a suitable shape, thereby producing an appropriate diopter, so that the light is properly refracted by the lens 94, Cooperating with the crystal lens 91 that cannot be adjusted normally, it can be projected on the retina 92 .

However, the lens 94 of the conventional myopia glasses has only one focal point. Although the center of the image of the object can fall on the retina 92, the periphery of the image will fall behind the retina 92. If things go on like this, the eyeball 9 will not be able to image correctly. The increase of the eye axis, and the increase of the eye axis will make the center of the image return to the front of the retina 92, forming a vicious circle, causing myopia to become more serious even though wearing glasses improves myopia.

Based on the above-mentioned phenomenon that wearing glasses can make myopia worse, the medical community has developed a method to control myopia by using a mydriatic agent (Atropine, Atropine). A careful study of the cause of myopia is the disorder of the control of the ciliary muscle on the lens. Therefore, according to the degree of myopia, instilling an appropriate concentration of mydriatic agent into the eyeball can relax the tight ciliary muscle, and the lens will change its shape and improve the condition. the imaging position. However, after the eyeball is injected with mydriatic agent, the pupil will dilate, so the amount of light passing through the pupil will increase, and the patient will feel glare and even affect normal life.

In view of this, how to improve the above problems is the primary task to be solved by the present invention.

The main purpose of the present invention is to provide a contact lens, which can block part of the light entering the eyeball, thereby improving the photophobia caused by the use of mydriatics for myopia control patients. In addition, the present invention improves the imaging position in the eyeball through the planning and design of the diopter change of the lens, so as to achieve the effect of inhibiting the growth of the eye axis and avoiding the further deterioration of myopia.

In order to achieve the aforementioned purpose, the present invention provides a kind of myopia control contact lens, which defines an optical zone and a ring-shaped light-shielding zone, wherein the optical zone includes: a central part that is circular and has a diameter below 3mm, its It has a constant diopter P ₁ ; a depth of focus part that is annular and surrounds the central part, the diameter of the inner ring is at least 1 mm, and the diameter of the outer ring is at most 7 mm, and its diopter changes continuously along the radial direction, and the highest The diopter is P ₂ , which satisfies 0.25 ≦ P ₂ - P ₁ ≦ 4; and a ring-shaped out-of-focus part that surrounds the outside of the depth of focus. The minimum diameter of the inner circle is 3mm, and the maximum diameter of the outer circle is 10mm. Its diopter changes continuously along the radial direction, and the highest diopter is P ₃ , which satisfies 3 ≦ P ₃ - P ₁ ≦ 20; the diameter of the inner circle of the shading area is between 3mm and 6mm, and the diameter of the outer circle is between Between 7mm and 15mm.

Preferably, the difference between the highest diopter and the lowest diopter of the depth-of-focus portion is between 0.25 and 4.

Preferably, the diopter P ₁ of the central portion is between 1 and -20.

In one embodiment, the shading rate of the shading area is any fixed value between 20% and 100%.

In another embodiment, the shading rate of the shading area gradually increases radially outward from the inner ring from a minimum value to a maximum value, wherein the minimum value is 0%, and the maximum value is between 30% and 100%.

In another embodiment, the shading rate of the shading area gradually increases radially outward from the inner ring, and the shading rate of the shading area changes with the amount of ultraviolet light received.

The above objects and advantages of the present invention can be easily understood from the following detailed descriptions and accompanying drawings of selected embodiments.

Please refer to Figures 1 and 2, which show the first embodiment of the myopia control contact lens provided by the present invention, which forms a curved surface as a whole, and when viewed from the front, defines an optical zone 1 and a light-shielding zone 2, wherein the optical zone 1 includes a central portion 11, a focal depth portion 12 and a defocused portion 13.

The central portion 11 forms a circle and is located at the center of the entire lens. In this embodiment, the diameter of the central portion 11 is less than 3 mm, and any position in the central portion 11 has a constant diopter P ₁ , wherein P ₁ is between 1 and −20. The above-mentioned diopter refers to the refractive power of a lens or a curved mirror, and its unit is m ^-1 .

The depth of focus part 12 forms a ring shape and surrounds the center part 11. The minimum diameter of the inner circle is 1mm, and the maximum diameter of the outer circle is 7mm. The diopter of the depth of focus 12 varies with different positions; in this embodiment, the diopter of the depth of focus 12 changes continuously along the radial direction, and gradually increases from inside to outside, the highest diopter is P ₂ , and the depth of focus 12 The difference (ADD) between the highest diopter and the lowest diopter of 12 is between 0.25 and 4. Further satisfy the relational expression of 0.25≦P ₂ - P ₁ ≦4.

The out-of-focus part 13 forms a ring shape and surrounds the outside of the depth-of-focus part 12. The minimum diameter of the inner circle is 3mm, and the maximum diameter of the outer circle is 10mm. The diopter of the out-of-focus part 13 varies with different positions; in this embodiment, the diopter of the out-of-focus part 13 changes continuously along the radial direction and gradually increases from inside to outside, and the highest diopter is P ₃ . Further satisfy the relational expression of 3≦P ₃ - P ₁ ≦20.

The shading area 2 forms a ring shape, the diameter of the inner ring is between 3mm and 6mm, and the diameter of the outer ring is between 7mm and 15mm. The shading area 2 has the function of blocking the passage of light, so that only part of the external light can pass through the lens and enter the eyes. According to the shading ratio of the shading area 2, it can be determined how much light will be filtered out. The middle area surrounded by the shading area 2 can allow all the light to pass through because it is not shaded.

In this embodiment, no matter where it is in the shading area 2 , the shading rate is any fixed value between 20% and 100%.

After wearing the above-mentioned contact lens of the present invention on the eye, when the myopia patient uses the mydriatic agent to control the myopia and causes the phenomenon of pupil dilation, part of the light can be filtered through the light-shielding area 2, reducing the amount of light entering the eye. The dosage can alleviate the patient's photophobia caused by dilated pupils, thereby overcoming the side effects of using mydriatics.

In addition, after wearing the above-mentioned contact lens of the present invention on the eye, as shown in Figure 9, since the diopters of the central part, the focal depth part and the defocused part of the lens 7 are different, and along the diameter The direction is continuously increasing, so that the central focus of the image of the object falls on the retina 81, and at the same time, the peripheral focus falls on the retina 81 or in front of the retina 81, thereby inhibiting the growth of the eye axis of the eyeball 8 and avoiding further deterioration of myopia. effect.

Please refer to Figures 3 and 4, which show the second embodiment of the myopia control contact lens provided by the present invention, which forms a curved surface as a whole, and when viewed from the front, defines an optical zone 3 and a light-shielding zone 4, wherein the optical zone 3 includes a central portion 31, a focal depth portion 32 and a defocused portion 33.

The central portion 31 forms a circle and is located at the center of the entire lens. In this embodiment, the diameter of the central portion 31 is less than 3 mm, and any position in the central portion 31 has a constant diopter P ₁ , wherein P ₁ is between 1 and −20. The above-mentioned diopter refers to the refractive power of a lens or a curved mirror, and its unit is m ^-1 .

The depth of focus part 32 forms a ring shape and surrounds the center part 31. The minimum diameter of the inner circle is 1mm, and the maximum diameter of the outer circle is 7mm. The diopter of the depth of focus part 32 varies with different positions; in this embodiment, as shown in Figure 5, the diopter of the depth of focus part 32 changes continuously along the radial direction, and gradually increases from the inside to the outside, and the highest diopter is P ₂ , and the difference (ADD) between the highest diopter and the lowest diopter of the depth of focus portion 32 is between 0.25 and 4. Further satisfy the relational expression of 0.25≦P ₂ - P ₁ ≦4.

The out-of-focus part 33 forms a ring shape and surrounds the outside of the depth-of-focus part 32. The minimum diameter of the inner circle is 3mm, and the maximum diameter of the outer circle is 10mm. The diopter of the defocused part 33 varies with different positions; in this embodiment, as shown in Figure 5, the diopter of the defocused part 33 changes continuously along the radial direction, and gradually increases from the inside to the outside, the highest The diopter is P ₃ . Further satisfy the relational expression of 3≦P ₃ - P ₁ ≦20.

The shading area 4 forms a ring shape, the diameter of the inner ring is between 3mm and 6mm, and the diameter of the outer ring is between 7mm and 15mm. The shading area 4 has the function of blocking the passage of light, so that only part of the external light can pass through the lens and enter the eyes. According to the shading rate of the shading area 4, it can be determined how much light will be filtered out. The middle area surrounded by the shading area 4 allows all the light to pass through because it is not shielded.

In this embodiment, as shown in Figure 5, the shading rate of the shading area 4 changes continuously along the radial direction, and gradually increases from a minimum value to a maximum value from the inside to the outside, wherein the minimum value is 0%, The maximum value is between 30% and 100%.

Please refer to Figures 6, 7A, and 7B, which show the third embodiment of the myopia control contact lens provided by the present invention, which forms a curved surface as a whole, and when viewed from the front, defines an optical zone 5 and a The light shielding area 6, wherein the optical area 5 includes a central portion 51, a depth of focus portion 52 and a defocusing portion 53.

The central portion 51 forms a circle and is located at the center of the entire lens. In this embodiment, the diameter of the central portion 51 is less than 3 mm, and any position in the central portion 51 has a constant diopter P ₁ , wherein P ₁ is between 1 and −20. The above-mentioned diopter refers to the refractive power of a lens or a curved mirror, and its unit is m ^-1 .

The depth of focus part 52 forms a ring shape and surrounds the outside of the center part 51. The minimum diameter of the inner circle is 1mm, and the maximum diameter of the outer circle is 7mm. The diopter of the depth of focus part 52 varies with different positions; in this embodiment, as shown in Figure 8, the diopter of the depth of focus part 52 changes continuously along the radial direction, and gradually increases from the inside to the outside, and the highest diopter is P ₂ , and the difference (ADD) between the highest diopter and the lowest diopter of the depth of focus portion 52 is between 0.25 and 4. Further satisfy the relational expression of 0.25≦P ₂ - P ₁ ≦4.

The out-of-focus part 53 forms a ring shape and surrounds the outside of the depth-of-focus part 52. The minimum diameter of the inner circle is 3mm, and the maximum diameter of the outer circle is 10mm. The diopter of the defocused part 53 varies with different positions; in this embodiment, as shown in Figure 8, the diopter of the defocused part 53 changes continuously along the radial direction, and gradually increases from the inside to the outside, the highest The diopter is P ₃ . Further satisfy the relational expression of 3≦P ₃ - P ₁ ≦20.

The shading area 6 forms a ring shape, the diameter of the inner ring is between 3mm and 6mm, and the diameter of the outer ring is between 7mm and 15mm. The shading area 6 has the function of blocking the passage of light, so that only part of the external light can pass through the lens and enter the eyes. According to the shading ratio of the shading area 6, it can be determined how much light will be filtered out. The middle area surrounded by the light-shielding area 6 can allow all the light to pass through because it is not shaded.

In this embodiment, as shown in FIG. 8, the shading rate of the shading area 6 changes continuously along the radial direction, and gradually increases from the inside to the outside. In addition, the shading rate of the shading area 6 will change with the amount of ultraviolet light received. When the external ultraviolet light is weak, the shading rate of the shading area 6 will become a lower value as shown in Figure 7A. Further, less light is filtered out; and when the external ultraviolet light is strong, the shading rate of the shading area 6 will become a higher value as shown in FIG. 7B, thereby filtering out more light.

However, the disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention, and any replacement of equivalent elements should still fall within the scope of the present invention.

To sum up, those skilled in the art can understand that the present invention can clearly achieve the above-mentioned purpose, and it actually complies with the provisions of the Patent Law, so they should file an application according to the law.

1: Optical zone 11: Center 12: Depth of focus 13: Out-of-focus part 2: shading area 3: Optical zone 31: Center 32: Depth of focus 33: Out-of-focus part 4: shading area 5: Optical zone 51: Center 52: Depth of focus 53: Out-of-focus part 6: shading area 7: Lens 8: eyeball 81: retina 9: eyeball 91:Crystal 92: Retina 93: Ciliary muscle 94: Lenses

Figures 1 and 2 are schematic plan views of the first embodiment of the present invention; Figures 3 and 4 are schematic plan views of the second embodiment of the present invention; Figure 5 is a graph of the refractive index and light shielding rate of the second embodiment of the present invention; Figures 6, 7A and 7B are schematic plan views of the third embodiment of the present invention; Figure 8 is a graph of the refractive index and light shielding rate of the third embodiment of the present invention; Figure 9 is a schematic diagram of the use state of the present invention; Figure 10A is a schematic diagram of an object projected on a normal eyeball; Figure 10B is a schematic diagram of the object projected on the myopic eyeball; Fig. 10C is a schematic diagram of objects projected on the eyeball under conventional glasses for correcting vision.

2: shading area

Claims (6)

A kind of myopia control contact lens, which defines an optical zone and a ring-shaped light-shielding zone, wherein the optical zone includes: a circular central part with a diameter of less than 3 mm, which has a constant diopter P ₁ ; The depth of focus is annular and surrounds the outside of the central part. The diameter of the inner ring is at least 1 mm, and the diameter of the outer ring is at most 7 mm. The diopter changes continuously along the radial direction, and the highest diopter is P ₂ , which satisfies 0.25 ≦ P ₂ - P ₁ ≦ 4; and a ring-shaped out-of-focus part that surrounds the outside of the depth of focus. The diameter of the inner ring is at least 3 mm, and the diameter of the outer ring is at most 10 mm. The diopter changes continuously along the radial direction. , and the highest diopter is P ₃ , where 3 ≦ P ₃ - P ₁ ≦ 20 is satisfied; the diameter of the inner circle of the shading area is between 3mm and 6mm, and the diameter of the outer circle is between 7mm and 15mm. The myopia control contact lens according to Claim 1, wherein the difference between the highest diopter and the lowest diopter in the depth of focus is between 0.25 and 4. The myopia control contact lens according to claim 1, wherein the diopter P1 of the central part is between ₁ and -20. The myopia control contact lens according to claim 1, wherein the shading rate of the shading area is any fixed value between 20% and 100%. The myopia control contact lens as described in Claim 1, wherein, the shading rate of the shading area gradually increases from a minimum value to a maximum value radially outward from the inner ring, wherein the minimum value is 0%, and the maximum value is between 30 % to 100%. The myopia control contact lens according to claim 1, wherein the shielding rate of the light-shielding area gradually increases radially outward from the inner ring, and the shielding rate of the light-shielding area changes with the amount of ultraviolet light received.

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