An accommodating intraocular lens

Abstract

The application discloses a kind of unaccommodated contact lens lenses, including lens body, the lens body is provided with optical area, the middle part of the optical area is provided with dioptric correction area, the outer periphery of the dioptric correction area is provided with first defocus ring, the outer periphery of the first defocus ring is provided with second defocus ring, the defocus amount of the second defocus ring is greater than the defocus amount of the first defocus ring, and the defocus amount of the first defocus ring and the second defocus ring changes in radial direction.Compared with prior art, in the technical scheme of the application, by setting the defocus amount of the first defocus ring and the second defocus ring to be variable, when blinking, the lens body will move, so that the defocus amount of the area corresponding to the original position of the eyeball changes, so that the brain cannot clearly identify the peripheral imaging, that is, the effect of inhibiting the growth of the eye axis can be maintained, so that longer-term myopia control effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of contact lens technology, and in particular to an amorphous contact lens. Background Technology

[0002] The degree of light refraction at an interface can be expressed as refractive power, which depends on the refractive indices of the two media and the radius of curvature of the interface. Myopia is a type of refractive error. In a normal eye, both central and peripheral images are projected onto the retina. In a myopic eye, due to the elongation of the eyeball, parallel light rays, in a relaxed state of accommodation, focus in front of the retina after refraction by the eye's refractive system.

[0003] Novel peripheral defocus lenses can reduce hyperopic defocus in the periphery of the retina, and even reduce it to myopic defocus, thus alleviating axial elongation. These specially designed optical lenses can be orthokeratology lenses (such as OK lenses), contact lenses (including soft contact lenses and hard contact lenses such as RGP lenses), or eyeglasses (such as prism bifocals, bifocals, and progressive multifocals). After myopia is corrected with peripheral defocus lenses, the image at the central visual field is projected onto the retina, while the peripheral image is projected onto or in front of the retina, creating a myopic defocus effect. Studies have found that peripheral defocus contact lenses can control myopia (i.e., inhibit axial elongation) with a success rate of approximately 30% to 40%.

[0004] However, with existing technology, after long-term wear, the brain becomes accustomed to the pattern of defocus changes in existing lenses, which reduces the success rate of inhibiting axial length growth, meaning that the effect of myopia control weakens over time. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide an amorphous contact lens that, by setting the defocus amount of the defocus zone to vary irregularly, makes it impossible for the brain to clearly recognize peripheral images in a regular manner, thereby achieving a longer-term myopia control effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A variable focal length contact lens includes a lens body with an optical zone. The optical zone has a refractive correction zone in its center. A first defocus ring surrounds the outer periphery of the refractive correction zone, and a second defocus ring surrounds the outer periphery of the first defocus ring. The defocus amount of the second defocus ring is greater than that of the first defocus ring, and the defocus amounts of the first and second defocus rings vary in the radial direction.

[0008] Furthermore, the first defocus ring is provided with a plurality of first defocus zones, and each first defocus zone has a different defocus amount within the same radius size range in the radial direction.

[0009] Furthermore, the amount of defocusing varies for each of the first defocusing regions within the same radius size gradient range in the radial direction.

[0010] Furthermore, the second defocus ring is provided with a plurality of second defocus zones, and the defocus amount of the second defocus zone increases in a direction from the center of the second defocus ring along the outer peripheral edge of the second defocus ring.

[0011] Furthermore, the amount of defocusing in each of the second defocusing zones varies in the direction of increasing from the center of the second defocusing ring along the outer peripheral edge of the second defocusing ring.

[0012] Furthermore, the refractive correction area is also provided with a decompression area.

[0013] Furthermore, within the same angular direction and the same radius size gradient range, the defocusing amount change rate K1 of the first defocusing ring is less than the defocusing amount change rate K2 of the second defocusing ring.

[0014] Furthermore, in the same angular direction, the distribution function of the defocusing amount of the first defocusing ring in the radial direction is: ,in , Scaling parameters for the function, , These are the e-index radial translation parameter and the Log defocus parameter, respectively.

[0015] Furthermore, in the same angular direction, the distribution function of the defocusing amount of the second defocusing ring in the radial direction is: ,in , Scaling parameters for the function, , These are the radial translation parameter and the defocusing parameter of the e-exponential function, respectively.

[0016] Furthermore, a plurality of the first defocus areas are asymmetrically arranged around the center of the first defocus ring, and / or a plurality of the second defocus areas are asymmetrically arranged around the center of the second defocus ring.

[0017] Compared to existing technologies, the amorphous contact lens provided by this invention includes a lens body with an optical zone. A refractive correction zone is located in the center of the optical zone. A first defocus ring surrounds the outer periphery of the refractive correction zone, and a second defocus ring surrounds the outer periphery of the first defocus ring. The defocus amount of the second defocus ring is greater than that of the first defocus ring, and the defocus amounts of the first and second defocus rings vary radially. By making the defocus amount of the defocus zone irregularly varied, this invention prevents the brain from clearly recognizing peripheral images according to a predictable pattern, thus increasing the success rate of inhibiting axial elongation and achieving a longer-term myopia control effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the amorphous contact lens provided by the present invention.

[0020] Figure 2 This is a schematic diagram showing the distribution of the first defocus area in the first defocus ring of an embodiment of the amorphous contact lens provided by the present invention.

[0021] Figure 3 This is a schematic diagram showing the distribution of the first defocus area in the first defocus ring of another embodiment of the amorphous contact lens provided by the present invention.

[0022] Figure 4 This is a schematic diagram showing the distribution of the second defocus area in the second defocus ring of an embodiment of the amorphous contact lens provided by the present invention.

[0023] Figure 5 A diagram showing the relationship between the refractive power and radius of the decompression zone and the refractive correction zone of the amorphous contact lens provided by this invention.

[0024] Figure 6 The distribution function diagram of the defocus amount of the first and second defocus rings of the amorphous contact lens provided by the present invention is shown at the same angle upwards.

[0025] Explanation of reference numerals in the attached diagram:

[0026] 1. Lens body; 2. Optical zone; 3. Refractive correction zone; 4. First defocus ring; 5. Second defocus ring; 6. First defocus area; 7. Second defocus area; 6a. First defocus area; 6b. Another first defocus area; 6c. First first defocus area; 6d. Second first defocus area; 6e. Third first defocus area; 7a. First second defocus area; 7b. Second second defocus area; 7c. Third second defocus area. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may have other meanings besides indicating orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0030] Furthermore, the terms “first” and “second” as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are used only to distinguish one element from another. When used herein, the singular forms “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having” specify the presence of the stated features, integrals, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integrals, steps, operations, components, parts, or combinations thereof.

[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] like Figure 1 As shown, the amorphous contact lens provided by the present invention includes a lens body 1, an optical zone 2, a refractive correction zone 3 in the center of the optical zone 2, a first defocus ring 4 surrounding the outer periphery of the refractive correction zone 3, and a second defocus ring 5 surrounding the outer periphery of the first defocus ring 4. The defocus amount of the second defocus ring 5 is greater than that of the first defocus ring 4, and the defocus amounts of the first defocus ring 4 and the second defocus ring 5 vary in the radial direction.

[0034] It should be noted that the refractive correction zone 3 enables the image to be formed on the retina, thus correcting vision. The first defocus ring 4 and the second defocus ring 5 form myopia defocus by setting defocus amount in the periphery, which is used to control myopia, prevent myopia from worsening, and achieve the effect of myopia prevention and control.

[0035] Understandably, the defocus amount of the second defocus ring 5 is greater than that of the first defocus ring 4. To a certain extent, the greater the defocus amount, the better the effect of myopia control. However, a greater defocus amount will cause discomfort to the user when wearing the device. Since the first defocus ring 4 is close to the refractive correction zone 3, the defocus amount of the second defocus ring 5 is greater than that of the first defocus ring 4, which can provide a buffering effect for the eyes. That is, while controlling myopia, it reduces the degree of discomfort to the eyes when wearing the device.

[0036] The defocus amount of the first defocus ring 4 and the second defocus ring 5 varies in the radial direction. Specifically, the defocus amount of the first defocus ring 4 and the second defocus ring 5 varies irregularly in the radial direction, that is, the increase or decrease of the defocus amount of the first defocus ring 4 in different radius range gradients is different.

[0037] In one embodiment, the defocusing amount of the first defocusing ring increases from the inner radial direction to the outer radial direction, and the minimum defocusing amount of the second defocusing ring is greater than the maximum defocusing amount of the first defocusing ring. In another embodiment, the defocusing amount of the first defocusing ring decreases from the inner radial direction to the outer radial direction, and the minimum defocusing amount of the second defocusing ring is greater than the maximum defocusing amount of the first defocusing ring.

[0038] It is understandable that during a blink, the pressure of the eyelid on the lens body 1 causes the lens body 1 to shift on the eyeball, which changes the amount of defocus on the original position on the eyeball. This makes it difficult for the eye to get used to the distribution pattern of defocus on the first defocus ring 4 and the second defocus ring 5, making it impossible for the brain to clearly identify the peripheral images according to the pattern, thereby achieving a longer-term myopia control effect.

[0039] Compared with the prior art, in the technical solution of the present invention, by setting the defocus amount of the first defocus ring 4 and the second defocus ring 5 to be irregularly varied, the lens body 1 will move after blinking, causing the defocus amount of the area corresponding to the original position of the eyeball to change. This makes it difficult for the brain to recognize or get used to the defocus amount distribution on the first defocus ring 4 and the second defocus ring 5 in a short period of time. The defocus amount of the first defocus ring and the second defocus ring is large, making it difficult for the brain to clearly recognize the peripheral image, that is, it can maintain the effect of inhibiting the growth of the axial length of the eye, so that the image through the refractive correction area can be imaged on the retina for a long time, thereby achieving a longer-term myopia control effect.

[0040] In one embodiment, such as Figure 1 and Figure 2 As shown, the first defocus ring 4 is provided with several first defocus areas 6. Each first defocus area 6 has a different defocus amount within the same radius gradient in the radial direction. For example, if two first defocus areas 6 are provided at angular angles of 30° or 60° and radii between 7mm and 8mm, namely a first defocus area 6a and a first defocus area 6b, then the two first defocus areas 6 located at the same radius (30° or 60°) have different defocus amounts. For instance, at 30° and with a radius between 7mm and 8mm, one first defocus area 6a is located at 7mm-7.5mm. Between these two points, another first defocus zone 6b is located between 7.5mm and 8mm. If the defocus amount of one first defocus zone 6a is a0 and the defocus amount of the other first defocus zone 6b is b0, then a0 is not equal to b0. This means that the defocus amount of each first defocus zone 6 is different within the same radius size range in the radial direction. This results in an irregular distribution of the defocus amount on the first defocus ring 4, making it difficult for the brain to get used to or recognize the distribution of the defocus amount of the first defocus zone 6 on the first defocus ring 4. As a result, the brain cannot clearly recognize the peripheral image, which can maintain the effect of inhibiting the growth of the eye axis and achieve the effect of myopia control.

[0041] Specifically, the amount of defocusing varies within the same radial radius gradient range for each first defocusing zone 6. This is understandable, as... Figure 3 As shown, three first defocus zones 6 are set within a 30° angular radius and a radius of 7mm-8.5mm: the first first defocus zone 6c, the second first defocus zone 6d, and the third first defocus zone 6e. The first first defocus zone 6c is located between 7mm and 7.5mm, the second first defocus zone 6d is between 7.5mm and 8mm, and the third first defocus zone 6e is between 8mm and 8.5mm. If, within a 30° angular radius, the defocus amount of the first first defocus zone 6c is a1, the defocus amount of the second first defocus zone 6d is b1, and the defocus amount of the third first defocus zone 6e is c1, then the difference between a1 and b1 is not equal to the difference between b1 and c1. That is, the change in defocus amount within the same radius gradient range in the radial direction varies for each first defocus zone 6. This results in an irregular distribution of defocus amount across different first defocus zones 6, making it difficult for the brain to clearly recognize peripheral images, thus achieving the effect of myopia control.

[0042] Furthermore, such as Figure 1 As shown, the second defocus ring 5 is provided with several second defocus zones 7. The defocus amount of the second defocus zone 7 increases from the center of the second defocus ring 5 along the outer peripheral edge of the second defocus ring 5. That is, the closer the second defocus zone 7 is to the outer edge of the second defocus ring 5, the greater its defocus amount. A larger defocus amount can achieve a better myopia control effect. The fact that the defocus amount of the second defocus zone 7 increases from the center of the second defocus ring 5 along the outer peripheral edge of the second defocus ring 5 ensures that the defocus amount of the second defocus zone 7 near the refractive correction zone 3 is smaller. Although a larger defocus amount results in a better myopia control effect, a larger defocus amount can easily cause eye discomfort and even lead to a more blurred image. In order to ensure greater wearing comfort, the defocus amount of the second defocus zone 7 increases from the center of the second defocus ring 5 along the outer peripheral edge of the second defocus ring 5. This ensures that while controlling myopia, the wearing comfort is better, and the refractive correction zone 3 can be clearly imaged on the retina.

[0043] Specifically, the amount of defocusing in each second defocus zone 7 increases differently in the direction from the center of the second defocus ring 5 along the outer periphery of the second defocus ring 5. It is understandable that, as... Figure 4As shown, three second defocus areas 7 are set within a radius of 7mm-8.5mm at an angular angle of 30°. These are designated as the first second defocus area 7a, the second second defocus area 7b, and the third second defocus area 7c. The first second defocus area 7a is located between 7mm and 7.5mm, the second second defocus area 7b is located between 7.5mm and 8mm, and the third second defocus area 7c is located between 8mm and 8.5mm. If, at an angular angle of 30°, the defocus amount of the first second defocus area 7a is a2, the defocus amount of the second second defocus area 7b is b2, and the defocus amount of the third second defocus area 7c is c2, then c2... If the difference between c2 and b2 is greater than b2 and a2, and the difference between c2 and b2 is not equal to the difference between b2 and a2, then the defocus amount of each second defocus zone 7 has a different gradient in the direction of increasing from the center of the second defocus ring 5 along the outer periphery of the second defocus ring 5. This results in an irregular distribution of the defocus amount of the second defocus zone 7 in the radial direction, making it difficult for the brain to get used to recognizing the distribution pattern of the defocus amount of the second defocus zone 6 in a short period of time. This makes it difficult for the brain to clearly recognize the peripheral images, thus achieving the effect of myopia control.

[0044] Furthermore, such as Figure 1 As shown, several first defocus zones 6 are asymmetrically arranged around the center of the first defocus ring 4, and / or several second defocus zones 7 are asymmetrically arranged around the center of the second defocus ring 5. That is, the asymmetrical distribution of the first defocus zones 6 and the second defocus zones 7 can make the distribution pattern of defocus amount on the first defocus ring 4 and the second defocus ring 5 more irregular. This makes it difficult for the brain to clearly recognize the peripheral image, i.e., it is difficult to recognize the pattern of peripheral defocus amount changes. This increases the success rate of inhibiting axial growth, thereby achieving a longer-term myopia control effect.

[0045] Preferably, since the first defocus ring 4 and the second defocus ring 5 each have a relatively large number of defocus areas, and in order to prevent excessive defocus from causing discomfort to the eyes when wearing the lens, a decompression zone (not shown) is provided in the refractive correction area 3. In this embodiment, as shown... Figure 5 As shown, the refractive power of the refractive correction zone 3 is -3.2D and is a constant value. The refractive power of the decompression zone decreases along the direction from the center of the refractive correction zone 3 towards its edge 1, meaning the refractive power of the decompression zone is greater than that of the refractive correction zone 3. This means that when the first and second defocus rings are used to control myopia due to their unfocused changes, the negative impact of excessive defocus in these rings is mitigated by the decompression zone. This allows users to avoid discomfort caused by excessive defocus when wearing the lenses. Furthermore, the presence of a decompression zone within the refractive correction zone allows for longer lens wearing times, thus inhibiting axial growth for an extended period and achieving better myopia control.

[0046] It should be noted that the addition degree (ADD) of the depressurization zone is between +0.2D and +1.00D. In a preferred embodiment, such as... Figure 2 As shown, the addition degree (ADD) of the decompression zone is between +0.5D and +0.8D. For example, in this embodiment, the refractive power of the decompression zone decreases from -2.2D to -2.8D, which means the addition degree of the decompression zone is +0.6D. Therefore, by setting a decompression zone in the refractive correction zone 3, the discomfort caused by excessive accommodation due to excessive defocus over a long period of time can be reduced.

[0047] Furthermore, such as Figure 6 As shown, within the same angular direction and the same radius size gradient range, the defocusing amount change rate K1 of the first defocusing ring 4 is less than the defocusing amount change rate K2 of the second defocusing ring 5. It should be noted that the defocusing amount change rate reflects the speed of defocusing amount change. Since the defocusing amount of the second defocusing ring 5 is greater than that of the first defocusing ring 4, and the defocusing amount change rate K1 of the first defocusing ring 4 is less than that of the second defocusing ring 5, it can be understood that the defocusing amount of the second defocusing ring 5, while changing, always remains greater than that of the first defocusing ring 4. This means that the closer to the lens periphery, the less clear the image becomes for the brain. The system clearly identifies peripheral images, achieving the effect of myopia control. Furthermore, the defocus change rate K1 of the first defocus ring 4 is less than the defocus change rate K2 of the second defocus ring 5. In other words, the defocus change rate K2 of the second defocus ring 5 is greater than the defocus change rate K1 of the first defocus ring 4. This means that the defocus change rate of the second defocus ring 5 is greater than that of the first defocus ring 4. This makes the defocus distribution of the second defocus ring 5 more complex and irregular than that of the first defocus ring 4. Even if the brain cannot clearly identify peripheral images, it can maintain the effect of inhibiting axial growth and achieve the effect of myopia control.

[0048] Specifically, such as Figure 6 As shown, in the same angular direction, the distribution function of the defocus amount of the first defocus ring 4 in the radial direction is: ,in , Scaling parameters for the function, , These are the e-exponential radial translation parameter and the Log defocusing parameter, respectively; in the same angular direction, the distribution function of the defocusing amount of the second defocusing ring in the radial direction is: ,in , Scaling parameters for the function, , These are the radial translation parameter and the defocusing parameter of the e-exponential function, respectively.

[0049] More specifically, in one embodiment, =0.3、 =0.5、 =0.2、 =0.8 and =4、 =0.18、 =0.4、 =0.4, then the function curves of Y1 and Y2 are as follows: Figure 3 As shown, it can be understood that the slopes of functions Y1 and Y2 represent the values ​​of K1 and K2, respectively.

[0050] It should be noted that the defocus area can be customized by adjusting the function scaling parameters, including the defocus range, defocus width, maximum ADD amount, single-pixel defocus phase, and phase between defocus points in different defocus rings. This allows for a more complex distribution of defocus amounts in the first defocus ring 4 and the second defocus ring 5, making it difficult for the brain to quickly adapt to and recognize the defocus distribution. Specifically, the defocus areas of the first defocus ring 4 and the second defocus ring 5 inhibit the growth rate of the axial length of the eye, preventing the brain from clearly recognizing peripheral images. Through the refractive correction zone 3, the image can be kept focused on the retina for a longer period, achieving myopia control and preventing the brain from adapting to the defocus distribution in the first defocus ring 4 and the second defocus ring 5, thus preventing further axial growth and ensuring that the image is formed in front of the retina.

[0051] In summary, the amorphous contact lens provided by this invention has a plurality of first defocus zones 6 on the first defocus ring 4. The defocus amount of each first defocus zone 6 varies within the same radius size range in the radial direction, resulting in an irregular distribution of the defocus amount on the first defocus ring 4. This makes it difficult for the brain to become accustomed to or recognize the defocus amount distribution of the first defocus zones 6 on the first defocus ring 4. Furthermore, the change in defocus amount varies within the same radius size gradient range in the radial direction for each first defocus zone 4. The varying defocus amount within the gradient range results in an irregular distribution of defocus amount across different first defocus zones 4. The second defocus ring 5 is configured with several second defocus zones 7, with the defocus amount in each zone increasing from the center of the second defocus ring 5 along its outer periphery. This ensures good wearing comfort while controlling myopia and allows for clear imaging of the refractive correction area on the retina. A decompression zone is included in the refractive correction area to prevent excessive defocus from causing eye discomfort when wearing the lens. Compared to existing technologies, the present invention, by setting the defocus amount of the first and second defocus rings 4 and 5 to vary non-directionally, causes the lens body 1 to move after blinking, altering the defocus amount in the area corresponding to the original position of the eyeball. This prevents the brain from clearly recognizing peripheral images, thus maintaining the effect of inhibiting axial growth and achieving a longer-term myopia control effect.

[0052] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of the present invention.

Claims

1. A type of amorphous contact lens, characterized in that, The system includes a lens body (1), which has an optical zone (2). A refractive correction zone (3) is located in the center of the optical zone (2). A first defocus ring (4) surrounds the outer periphery of the refractive correction zone (3). A second defocus ring (5) surrounds the outer periphery of the first defocus ring (4). The defocus amount of the second defocus ring (5) is greater than that of the first defocus ring (4), and the defocus amounts of the first defocus ring (4) and the second defocus ring (5) vary in the radial direction. In the same angular direction, the distribution function of the defocus amount of the first defocus ring (4) in the radial direction is... ,in , Scaling parameters for the function, , These are the e-exponential radial translation parameter and the Log defocusing parameter, respectively; in the same angular direction, the distribution function of the defocusing amount of the second defocusing ring (5) in the radial direction is: ,in , Scaling parameters for the function, , These are the radial translation parameter and the defocusing parameter of the e-exponential function, respectively.

2. The amorphous contact lens according to claim 1, characterized in that, The first defocus ring (4) is provided with a plurality of first defocus areas (6), and each first defocus area (6) has a different defocus amount within the same radius size range in the radial direction.

3. The amorphous contact lens according to claim 2, characterized in that, The amount of defocusing varies for each of the first defocused regions (6) within the same radial radius size gradient range in the radial direction.

4. The amorphous contact lens according to claim 3, characterized in that, The second defocus ring (5) is provided with a plurality of second defocus areas (7), and the defocus amount of the second defocus area (7) increases in the direction from the center of the second defocus ring (5) along the outer peripheral edge of the second defocus ring (5).

5. The amorphous contact lens according to claim 4, characterized in that, The amount of defocusing in each of the second defocusing zones (7) varies in the direction of increasing from the center of the second defocusing ring (5) along the outer periphery of the second defocusing ring (5).

6. The amorphous contact lens according to claim 1, characterized in that, The refractive correction area (3) is also provided with a decompression area.

7. The amorphous contact lens according to claim 1, characterized in that, Within the same angular direction and the same radius size gradient range, the defocusing amount change rate K1 of the first defocusing ring (4) is less than the defocusing amount change rate K2 of the second defocusing ring (5).

8. The amorphous contact lens according to claim 4, characterized in that, A plurality of first defocus areas (6) are asymmetrically arranged around the center of the first defocus ring (4), and / or a plurality of second defocus areas (7) are asymmetrically arranged around the center of the second defocus ring (5).

Images