Myopia control contact lens

Abstract

To provide a myopia control contact lens.SOLUTION: The present invention discloses a myopia control contact lens, and the myopia control contact lens includes a central correction area, an accommodative regulation area, and a defocus area. The central correction area provides a predetermined diopter. The accommodative regulation area surrounds the central correction area, has N-order spherical aberration changes in a radial direction, and has a first diopter distribution. Here, N is a positive integer. The defocus area surrounds the accommodative regulation area, and has a second diopter distribution along the radial direction. The maximum diopter of the second diopter distribution is obtained by adding a defocus variable to the predetermined diopter, and the defocus variable satisfies the following equation. Y=a*X2+b*X+c. Here, X is the predetermined diopter, Y is the defocus variable, a is a first coefficient, b is a second coefficient, c is a constant, a and b range from 0 to 5, and c ranges from 0.5 to 15.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to contact lenses, and more particularly to contact lenses for myopia control. [Background technology]

[0002] The primary function of contact lenses is to correct vision, similar to conventional eyeglasses, including myopia, hyperopia, astigmatism, presbyopia, and aberrations. With the development of science and technology in medicine and optometry, contact lenses with various functions have been developed one after another. Among these, myopia control contact lenses are optical tools specially designed to reduce the progression of myopia.

[0003] Myopia control contact lenses can achieve their effect in several ways. For example, orthokeratology sheets are a type of hard contact lens that corrects vision by changing the shape of the cornea and are usually worn at night. Another method is daytime soft contact lenses. These contact lenses have a special optical design that slows myopia progression by increasing peripheral defocusing while maintaining central vision.

[0004] However, conventional myopia control contact lenses often have a miscorrection in the central area (e.g., weak correction in the central area), which leads to poor visual quality. Furthermore, conventional myopia control lens designs typically increase accommodation lag, failing to reduce the microaccommodative changes that increase with myopia progression, and failing to address issues such as peripheral hyperopic defocus remaining on the nasal peripheral retina even after correction. All of these issues reduce the effectiveness of myopia control lenses.

[0005] Therefore, there is a strong demand for contact lenses for myopia control that can overcome the above problems and effectively inhibit the progression of myopia. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem to be solved by the present invention is to provide a contact lens for myopia control that addresses the shortcomings of the prior art and can effectively inhibit the progression of myopia. [Means for solving the problem]

[0007] To solve the above technical problems, one technical solution adopted by the present invention is to provide a contact lens for myopia control. The contact lens includes a central correction area, an accommodation / adjustment area, and a defocus area. The central correction area provides a predetermined diopter. The accommodation / adjustment area surrounds the central correction area and has an N-th order spherical aberration change in the radial direction, providing a first diopter distribution, where N is a positive integer. The defocus area surrounds the accommodation / adjustment area and provides a second diopter distribution along the radial direction, where the maximum diopter of the second diopter distribution is the predetermined diopter plus a defocus variable, which satisfies the following formula:

[0008] Y=a*X 2 +b*X+c where X is the desired diopter, Y is the defocus variable, a is the first coefficient, b is the second coefficient, and c is a constant, where a is between 0 and 5, b is between 0 and 5, and c is between 0.5 and 15.

[0009] One of the beneficial effects of the present invention is that the myopia control contact lenses provided by the present invention achieve complete correction in the central correction area and improve visual quality. Furthermore, by arranging at least first-order spherical aberration changes in the accommodation and adjustment area, it is possible to reduce accommodation lag and reduce fine accommodation changes. Meanwhile, by designing additional focusing power in the defocus area based on the myopic power of the eye to be corrected, it is possible to increase the myopic offset in the periphery of the retina and achieve myopic defocus of the entire retina. With the above-mentioned configuration, the myopia control contact lenses provided by the present invention can effectively suppress the progression of myopia.

[0010] In order to better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and explanation only and are not intended to limit the scope of the present invention. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic plan view of a contact lens for myopia control according to an embodiment of the present invention. [Figure 2] 1 is a perspective schematic diagram of a myopia control contact lens according to an embodiment of the present invention. [Figure 3] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 1 is a diopter distribution diagram employing primary spherical aberration in a contact lens for myopia control according to an embodiment of the present invention. [Figure 5] FIG. 1 is a diopter distribution diagram employing secondary spherical aberration in a contact lens for myopia control according to an embodiment of the present invention. [Figure 6] FIG. 1 is a diopter distribution diagram employing fourth-order spherical aberration in a contact lens for myopia control according to an embodiment of the present invention. [Figure 7] FIG. 10 is a curve diagram showing the relationship between a defocus variable and a predetermined diopter according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following describes embodiments of the "contact lenses for myopia control" disclosed in the present invention. Those skilled in the art can understand the benefits and advantages of the present invention from the disclosure of this specification. The present invention can be implemented or applied in other different embodiments. Each detail in this specification can also be modified and changed equivalently based on various aspects or applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are for simple and schematic illustration only and do not represent actual dimensions. The following embodiments will further explain the technical matters related to the present invention, but the disclosed contents do not limit the present invention. In addition, the term "or" used in this specification may include any one or more combinations of related items according to actual circumstances.

[0013] Fig. 1 is a schematic plan view of a myopia control contact lens according to an embodiment of the present invention. Fig. 2 is a schematic perspective view of a myopia control contact lens according to an embodiment of the present invention. Fig. 3 is a schematic cross-sectional view taken along the line AA in Fig. 1.

[0014] 1 to 3, an embodiment of the present invention provides a myopia control contact lens 10, which includes a central correction area A1, an accommodation / adjustment area A2, and a defocus area A3. The myopia control contact lens 10 is made of, for example, hydrogel or silicone hydrogel, has high water content and excellent oxygen permeability, and is suitable for extended wear.

[0015] As shown in FIG. 1 , in a myopia control contact lens 10, the central correction area A1 has a substantially circular shape, and the accommodation / adjustment area A2 and defocus area A3 each have a substantially annular shape. The central correction area A1 may be located within a first radial range R1, the accommodation / adjustment area A2 may be located between the first radial range R1 and the second radial range R2, and the defocus area A3 may be located between the second radial range R2 and the third radial range R3. The second radial range R2 may include the first radial range R1 and a second outer diameter range r2, and the third radial range R3 may include the second radial range R2 and a third outer diameter range r3. The first radial range R1, the second outer diameter range r2, and the third outer diameter range r3 are continuously distributed along the radial direction Dr. In some embodiments of the present invention, the first radial range R1 is, for example, 0 to 0.5 mm, the second outer diameter range r2 is, for example, 0.5 to 2 mm, and the third outer diameter range r3 is greater than 2 mm.

[0016] For example, as shown in FIGS. 1 and 3, the central correction area A1 is a circular area defined by a virtual central optical axis C, which is the center of the myopia control contact lens 10. The accommodation / adjustment area A2 is an annular area that is centered on the virtual central optical axis C and surrounds the circular area (central correction area A1). Similarly, the defocus area A3 is another annular area that is centered on the virtual central optical axis C and surrounds the annular area (accommodation / adjustment area A2). The total diameter of the myopia control contact lens 10 may be 13.0 mm to 15.0 mm (i.e., a radius of 6.5 mm to 7.5 mm), but the present invention is not limited thereto.

[0017] Furthermore, in this embodiment, the lens body of the myopia control contact lens 10 has a front arc 100 and a base arc 102. For example, the front arc 100 may be an optical system in which the front arc 100 has a single curvature and the base arc 102 is an aspherical surface, or a composite optical system in which both the front arc 100 and the base arc 102 are aspherical surfaces, but the present invention is not limited thereto. The following description will explain the details of the myopia control contact lens 10 according to the embodiment of the present invention by describing the diopter distribution in detail. Based on the diopter distribution disclosed in the present invention, those skilled in the art can determine the manufacturing parameters of the contact lens, such as the distribution of the radii of curvature of the front arc 100 and the base arc 102, and the lens thickness required when using materials with different refractive indices. This allows the manufacture of a myopia control contact lens having the diopter distribution disclosed in the present invention. Since methods for manufacturing contact lenses based on diopter distributions are known to those skilled in the art, detailed description thereof will be omitted here.

[0018] The central correction area A1 has a predetermined diopter for correcting the myopia of the eye to be adjusted. Specifically, within the range of the central correction area A1, the predetermined diopter is the same as the diopter corresponding to the myopia of the eye to be adjusted, which is a complete correction. When moving from the central correction area A1 to the accommodation / adjustment area A2, the diopter changes continuously. The central correction area A1 can achieve a complete correction at the center of the myopia control contact lens 10, thereby improving visual quality.

[0019] The accommodation / accommodation area A2 is positioned surrounding the central correction area A1. In this embodiment, the accommodation / accommodation area A2 is used to adjust the degree of accommodative lag of the eye to be adjusted and reduce changes in fine accommodation. Generally, the performance of the myopia control contact lens 10 is evaluated by measuring the accommodative response and fine accommodation of the eye after correction. The accommodative response reflects the relationship between the amount of accommodative response and the amount of accommodative stimulus. If the response is smaller than the stimulus, this is called accommodative lag, indicating insufficient accommodation. If the response is larger than the stimulus, this is called hyperaccommodation, indicating excessive accommodation. Furthermore, fine accommodation refers to trembling or instability caused by spasms of the ciliary muscle when gazing at a near target. Unstable fine accommodation accumulates hyperopic defocus signals or forms a blurred image on the retina, causing a relative blockage of visual form, which can lead to the induction and acceleration of myopia progression. Clinically, excessive accommodative lag and microaccommodation promote axial growth of the eyeball, causing worsening myopia.

[0020] In order to reduce accommodation lag and suppress fine accommodation changes, the present invention designs the accommodation / adjustment area A2 to have an Nth-order spherical aberration change along the radial direction Dr, forming a first diopter distribution. All diopters in this first diopter distribution are greater than a predetermined diopter, where N is a positive integer. More specifically, the Nth-order spherical aberration change means that in the accommodation / adjustment area A2, the first diopter distribution, which varies along the radial direction Dr, has M zone maxima and zone minima, the total number of which is M. Here, M is an integer, and if N is an odd number, M is equal to N minus 1. If N is an even number, M is equal to N. The number of zone maxima is M / 2, and the diopter in each zone maximum area is greater than the diopter in each of the two adjacent zone minimum areas. The number of zone minima is equal to M minus the number of zone maxima. Based on these rules, it is possible to design myopia control contact lenses 10 with different spherical aberration changes.

[0021] 4, 5 and 6 are diopter distribution diagrams for myopia control contact lenses according to embodiments of the present invention employing first-order spherical aberration, second-order spherical aberration and fourth-order spherical aberration, respectively.

[0022] As can be seen from Figure 4, when the myopia power is -1D, the predetermined diopter within the central correction area A1, which has a radius of 0 mm to 0.5 mm, is the same as the diopter corresponding to the myopia power, achieving perfect correction. More specifically, when the myopia control contact lens 10 has an accommodation / adjustment area A2 employing primary spherical aberration, the first diopter distribution that varies along the radial direction Dr does not have a zone maximum value area or a zone minimum value area, but instead increases continuously from the end of the central correction area A1 (radius approximately 0.5 mm) to the end of the defocus area A3 (radius approximately 2 mm). Furthermore, in this first diopter distribution, all diopter values ​​are greater than the predetermined diopter.

[0023] However, as shown in FIG. 5, when the myopia control contact lens 10 has an accommodation / adjustment area A2 employing second-order spherical aberration, the first diopter distribution varying along the radial direction Dr has one area maximum area and one area minimum area. The area maximum area is the area containing the area maximum value along the radial direction Dr in the first diopter distribution, and the area minimum area is the area containing the area minimum value along the radial direction Dr in the first diopter distribution. Starting from the end of the central correction area A1, the diopter value continuously increases toward a maximum value within the first area maximum area, then continuously decreases toward a minimum value within the second area minimum area, and finally increases again toward the end of the defocus area A3. In the first diopter distribution of FIG. 5, all diopter values ​​are greater than the predetermined diopter, and the first area along the radial direction Dr is the area maximum value. The diopter maximum value in each area maximum area is greater than the diopter minimum value in the two area minimum area adjacent to it in the radial direction Dr. Therefore, the first diopter distribution shows a continuous S-shaped change that slopes toward the normal diopter range.

[0024] As shown in Figure 6, when the myopia control contact lens 10 has an accommodation area A2 employing fourth-order spherical aberration, the first diopter distribution varying along the radial direction Dr has two area maximum areas and two area minimum areas. Starting from the end of the central correction area A1, the diopter distribution continuously increases toward a maximum value within the first area maximum area, then continuously decreases toward a minimum value within the first area minimum area, then increases again toward a maximum value within the second area maximum area, then continuously decreases toward a minimum value within the second area minimum area, and finally increases again toward the end of the defocus area A3. In the first diopter distribution of Figure 6, all diopter values ​​are greater than the predetermined diopter, and the first area along the radial direction Dr is the area of ​​the area maximum. The plurality of regional maximum value areas and the plurality of regional minimum value areas are alternately arranged, and the diopter maximum value in each regional maximum value area is greater than the diopter minimum values ​​in the two regional minimum value areas adjacent to each other in the radial direction Dr. Therefore, the first diopter distribution exhibits two successive S-shaped changes that slope toward the normal diopter range.

[0025] When the myopia control contact lens 10 has an accommodation / adjustment area A2 employing sixth-order spherical aberration, the first diopter distribution varying in the radial direction Dr may have three zone maximum areas and three zone minimum areas. When the myopia control contact lens 10 has an accommodation / adjustment area A2 employing eighth-order spherical aberration, the first diopter distribution varying in the radial direction Dr may have four zone maximum areas and four zone minimum areas.

[0026] One point to be noted in this embodiment is that the maximum amount of change in Nth-order spherical aberration (maximum amplitude based on a predetermined diopter) in the accommodation / adjustment area A2 is limited by the diopter distribution in the defocus area A3. The details are as follows.

[0027] As shown in FIG. 1, the defocus area A3 is located in a position surrounding the adjustment / regulation area A2, and as described above, the defocus area A3 is located within the third outer diameter range r3 and exhibits a second diopter distribution along the radial direction Dr.

[0028] In an embodiment of the present invention, the defocus area A3 is primarily used to adjust the defocus characteristics of the eye to a myopic defocus state. Specifically, peripheral defocus represents the defocus state occurring on the peripheral retina after diopter correction, and its unit is diopters (D). Conventional myopia control contact lenses have been designed in clinical tests to adjust the periphery of the temporal retina to a myopic defocus state, but the asymmetry between the nasal and temporal retina tends to be overlooked. Because the myopic defocus effect on the nasal periphery is insufficient, hyperopic defocus still remains on the nasal retina after correction.

[0029] In contrast, in the present invention, the defocus area A3 is designed to have a peripheral defocus amount corresponding to each myopic power based on clinical results, and both the nasal and temporal retinas exhibit the effect of peripheral myopic defocus. Based on this result, the defocus area A3 of the myopia control contact lens 10 is designed so that its second diopter distribution is the predetermined diopter used for full correction in the central correction area A1 plus a defocus variable. The defocus variable satisfies the following formula:

[0030] Y=a*X 2 +b*X+c where X is the desired diopter, Y is the defocus variable, a is the first coefficient, b is the second coefficient, and c is a constant. a is between 0 and 5, b is between 0 and 5, and c is between 0.5 and 15.

[0031] In a preferred embodiment of the present invention, a and b are between 0.05 and 0.2, and c is between 0.5 and 10. More preferably, a is between 0.08 and 0.17, b is between 0.08 and 0.17, and c is between 1 and 8.

[0032] 7 is a curve diagram showing the relationship between the defocus variable and a predetermined diopter in an embodiment of the present invention. Referring to FIG. 7, based on the boundary of the above-mentioned condition, Y=0.08*X 2 +0.08*X+1 and Y=0.17*X 2 +0.17*X+8. As is clear from the range limited by these two equations, within the defocus area A3, the defocus variable can be adjusted according to the myopia power, and within the myopia power range of 0 to -12D, the defocus variable can be adjusted within a range of approximately 1 to 30 times the predetermined diopter.

[0033] Furthermore, the second diopter distribution includes a diopter increasing area and a diopter decreasing area in the radial direction Dr, and the diopter increasing area and the diopter decreasing area are defined with the maximum diopter of the area as a demarcation point. This maximum diopter of the area is expressed as a difference from a predetermined diopter and is used to set the maximum change amount of Nth-order spherical aberration change in the adjustment area A2 and all diopter values ​​in the first diopter distribution. In this embodiment, based on clinical experimental results, the maximum change amount of Nth-order spherical aberration change is within a first predetermined magnification of the defocus variable. In a preferred embodiment, the first predetermined magnification is set within the range of 0.01 to 0.9. More preferably, the first predetermined magnification is set within the range of 0.01 to 0.5. In addition, all diopter values ​​in the first diopter distribution are smaller than the maximum diopter of the area.

[0034] Therefore, as shown in Figure 4, the curve is Y=0.08*X 2 When the defocus variable is +0.08*X+1, the defocus variable corresponding to myopia of -1D is 1, and the maximum diopter is 0. When the radius is 0 mm, the corresponding predetermined diopter is approximately -1D, and the diopter gradually increases as the distance from the virtual central optical axis C increases. Therefore, when the predetermined diopter is used as the reference, the maximum change in spherical aberration in the accommodation / adjustment area A2 is 0.2, which corresponds to 0.2 times the defocus variable and is within the first predetermined magnification (in the range of 0.01 to 0.9 times).

[0035] Furthermore, as shown in Figure 5, the diopter values ​​of the central correction area A1, the adjustment area A2, and the defocus area A3 change continuously. In addition, the second diopter distribution has diopter increasing areas and diopter decreasing areas sequentially along the radial direction Dr, which are defined with the minimum diopter of the area as the demarcation point. For example, if the curve is Y=0.17*X 2 When the defocus parameter is +0.17*X+8, the defocus parameter corresponding to myopia of -11D is 26.7, and the maximum diopter is approximately 15.7. When the radius is 0 mm, the corresponding predetermined diopter is approximately -11D, and the diopter gradually increases as the distance from the virtual central optical axis C increases. Therefore, when the predetermined diopter is used as the reference, the maximum change in spherical aberration in the accommodation / adjustment area A2 is 2.67, which corresponds to 0.1 times the maximum diopter and is within the first predetermined magnification (ranging from 0.01 to 0.9 times).

[0036] See Table 1 below. This table corresponds to the curve Y=0.17*X shown in FIG. 2 Based on +0.17*X+8, the maximum diopter corresponding to different predetermined diopters and the maximum amount of change in each spherical aberration are disclosed.

[0037] [Table 1]

[0038] FIG. 6 shows another preferred embodiment of the present invention, in which the diopter values ​​of the central correction area A1, the accommodation / adjustment area A2, and the defocus area A3 change continuously. The second diopter distribution sequentially includes diopter increasing and decreasing areas along the radial direction Dr, which are defined by the minimum diopter of the area as the demarcation point. For example, the defocus parameter corresponding to -5D myopia is 6.4, and the maximum diopter is approximately 1.4. At a radius of 0 mm, the corresponding predetermined diopter is approximately -5D, and as the distance from the virtual central optical axis C increases, the diopter gradually increases. Therefore, based on a predetermined diopter, the maximum change in spherical aberration in the accommodation / adjustment area A2 is approximately 0.96, which corresponds to approximately 0.15 times the defocus parameter. This is within the first predetermined magnification (ranging from 0.01 to 0.9).

[0039] Furthermore, with regard to accommodation ability, the myopia control contact lenses of the present invention can provide better accommodation ability to the eye after correction compared to conventional myopia control contact lenses. Specifically, in an accommodation ability experiment, subjects wore the myopia control contact lenses of the present invention and conventional myopia control lenses, and the degree of accommodation lag of the eye was measured under three different conditions of accommodation demand. The experimental results show that the myopia control contact lenses of the present invention have a lower amount of accommodation lag than the conventional myopia control lenses under the same conditions. In other words, the eye after correction with the myopia control contact lenses of the present invention has better accommodation ability and is advantageous for myopia control applications.

[0040] In addition to the accommodative response, the myopia control contact lenses of the present invention have significantly lower fine accommodation changes compared to conventional myopia control contact lenses. Specifically, in the fine accommodation experiment, subjects wore myopia control lenses of the present invention and the prior art, and the fine accommodation of the eyes was measured under seven different test conditions. The experimental results showed that the fine accommodation changes under each condition for the prior art myopia control lenses were within the range of 60 to 75, while the measured values ​​for the embodiments of the present invention under the same conditions were all lower than those for the prior art myopia control lenses. The experimental results indicate that the myopia control contact lenses of the present invention have smaller fine accommodation changes, i.e., have higher dynamic accommodation stability.

[0041] Therefore, after correction with the myopia control contact lenses of the present invention, the eye can more stably and continuously focus an image on the central retina during focal length adjustment, reducing the occurrence of blurred images on the retina. Therefore, in clinical practice, the myopia control contact lenses of the present invention can inhibit the axial growth of the eyeball and effectively prevent the worsening of myopia.

[0042] Furthermore, experiments have confirmed that both myopia control contact lenses according to embodiments of the present invention and conventional myopia control contact lenses are capable of adjusting the peripheral temporal retina (the range in which the retinal eccentricity exceeds 0 degrees) to a myopic defocus state. However, conventional myopia control contact lenses are not designed to take into account the asymmetry between the nasal and temporal retinas, resulting in insufficient myopic defocusing effect in the nasal peripheral area (the range in which the retinal eccentricity is less than 0 degrees), resulting in a situation in which hyperopic defocus remains on the nasal retina even after correction. This hyperopic defocus positions the imaging focus behind the retina around the macula, promoting axial elongation and accelerating the worsening of myopia.

[0043] The myopia control contact lenses of the present invention are designed to take into account the asymmetry between the nasal and temporal retina, and can exhibit hyperopic defocus even in the nasal peripheral area (with retinal eccentricity less than 0 degrees) after correction. This allows the imaging focus to be positioned in front of the retina around the macula, effectively suppressing axial elongation and controlling the progression of myopia.

[0044] [Beneficial Effects of the Embodiments] One of the beneficial effects of the present invention is that the myopia control contact lenses provided by the present invention achieve complete correction in the central correction area and improve visual quality. Furthermore, by arranging at least first-order spherical aberration changes in the accommodation / accommodation area, it is possible to reduce accommodation lag and reduce fine accommodation changes. Meanwhile, in the defocus area, by designing the defocus variable based on the myopic power of the eye to be corrected, it is possible to increase the myopic offset in the periphery of the retina and achieve myopic defocus across the entire retina. These arrangements enable the myopia control contact lenses provided by the present invention to effectively control the progression of myopia.

[0045] The above disclosure is merely a preferred embodiment of the present invention, and does not limit the scope of the claims of the present invention. Therefore, all equivalent technical modifications made based on the contents of the specification and accompanying drawings of the present invention shall be included in the scope of the claims of the present invention. [Explanation of symbols]

[0046] 10: Myopia control contact lenses 100: Front arc 102: Base Arc A1: Central Orthodontic Area A2: Adjustment and adjustment area A3: Defocus area R1: First radius range R2: Second radius range R3: Third radius range r2: Second outer diameter range r3: Third outer diameter range Dr: Radial direction AA: Section line C: Virtual central optical axis

Claims

1. a central correction area providing a predetermined diopter; an accommodation and adjustment area surrounding the central correction area, having an N-th order spherical aberration change in a radial direction (N is a positive integer) and forming a first diopter distribution; a defocus area surrounding the adjustment area and forming a second diopter distribution along the radial direction; A contact lens for myopia control comprising: The maximum diopter of the second diopter distribution is the value obtained by adding a defocus variable to the predetermined diopter, and the defocus variable is Y=a*X. ２ +b*X+c, where X is a predetermined diopter, Y is a defocus variable, a is a first coefficient, b is a second coefficient, and c is a constant, where a is between 0 and 5, b is between 0 and 5, and c is between 0.5 and 15. A contact lens for myopia control.

2. 2. The myopia control contact lens of claim 1, wherein all diopters within said first diopter distribution are greater than said predetermined diopter.

3. 2. The myopia control contact lens of claim 1, wherein the first diopter distribution has area maximum areas and area minimum areas, the total number of which is M, where M is an integer, and when N is odd, M is equal to N minus 1, and when N is even, M is equal to N, and the diopter in each area maximum area is greater than the diopter in two adjacent area minimum areas.

4. 2. The myopia control contact lens of claim 1, wherein the second diopter distribution comprises areas of increasing diopter and areas of decreasing diopter sequentially along the radial direction.

5. 2. The myopia control contact lens of claim 1, wherein the maximum change in the Nth order spherical aberration change in the accommodation / adjustment area is within a first predetermined magnification of the defocus variable, the first predetermined magnification being between 0.01 and 0.

9.

6. 10. The myopia control contact lens of claim 1, wherein the central correction area is located within a first radial range, the accommodation / adjustment area is located between the first radial range and a second radial range, and the defocus area is located between the second radial range and a third radial range.

7. 7. The myopia control contact lens of claim 6, wherein said first radius range is within the range of 0 mm to 0.5 mm.

8. 7. The myopia control contact lens of claim 6, wherein the second radius range includes the first radius range and a second outer diameter range, the second outer diameter range being in the range of 0.5 mm to 2 mm.

9. 7. The myopia control contact lens of claim 6, wherein the third radius range includes the second radius range and a third outer diameter range, the third outer diameter range being greater than 2 mm.

10. 2. The myopia control contact lens of claim 1, wherein the diopters of the central correction area, the accommodation / adjustment area, and the defocus area vary continuously.

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