An astigmatic lens and eyeglasses

Abstract

The application discloses a kind of astigmatic lenses and glasses, wherein, astigmatic lenses, including: center area and surrounding area, surrounding area is arranged around center area, the radial dimension of center area is greater than the radial dimension of surrounding area;Center area is arranged with astigmatic cylinder, surrounding area is arranged with multiple array arrangement microcylinders, the diopter of each microcylinder is gradually changed along different meridian direction, in the direction away from center area, the difference between the diopter of each microcylinder and the diopter of center area gradually becomes large, and the diopter of each microcylinder is less than the diopter of center area.Further, by setting microcylinders in the surrounding area of astigmatic lenses, the diopter of microcylinders is gradually changed to relieve the abrupt change of the diopter of original astigmatic lenses, reduce the magnification difference generated at the edge of astigmatic lenses, to reduce visual distortion, so that the wearer can reduce the dizziness of the wearer when wearing the astigmatic lenses, improve the experience of the wearer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical technology, in particular to a myopic lens and glasses. BACKGROUND

[0002] Myopic lens (cylindrical lens) worn by myopic patients has different diopter in two principal meridian directions. This means that the magnification in different directions is different when observing objects through the lens. Especially in the edge area of the lens, the difference in magnification is more obvious, which will cause the image of the object at the edge of the field of view to be stretched or compressed. This distortion is particularly serious for patients with high myopia (e.g. myopia ≥ 1.5D). When the wearer turns his head or quickly turns around, the peripheral environment in the field of view will produce a significant distortion or instability, often described as "swimming" effect or visual distortion. In the long run, this visual distortion will cause the wearer to feel dizzy, dizziness and other discomfort, increase the burden of the brain to adapt to vision, and even affect the balance and safety when walking.

[0003] The current traditional solution is mainly to reduce the myopic degree to reduce the distortion, so as to let the patient's brain gradually adapt to the residual visual distortion. However, this method requires a long adaptation period, and a considerable part of patients with high myopia cannot fully adapt, resulting in the failure of the myopic correction effect. Some improved lens designs (such as asymmetric aspheric lenses or free-form surface technology) can optimize the aberration distribution in the field of view to some extent, but there is still no effective and fundamental solution to the peripheral distortion problem caused by high myopia. SUMMARY

[0004] The present application provides a myopic lens and glasses to solve the dizziness or dizziness phenomenon that may occur when the wearer wears a myopic lens in the related art, and to improve the wearer's experience.

[0005] According to an aspect of the present application, a myopic lens is provided, comprising: a central region and a surrounding region, the surrounding region is arranged around the central region, the radial size of the central region is greater than the radial size of the surrounding region;

[0006] Wherein, the central region is arranged with a myopic cylindrical lens, and the surrounding region is arranged with a plurality of arrayed micro-cylindrical lenses, the diopter of each micro-cylindrical lens gradually changes along different meridian directions, the difference between the diopter of each micro-cylindrical lens and the diopter of the central region gradually increases in the direction away from the central region, and the diopter of each micro-cylindrical lens is less than the diopter of the central region.

[0007] Optionally, one side surface of the myopic cylindrical lens is spherical or aspherical, and the other side surface is cylindrical or toric.

[0008] Optionally, the micro-lens columns are closely arranged.

[0009] Optionally, the micro-lens columns are polygonal or curved polygonal in shape.

[0010] Optionally, edges between adjacent micro-lens columns are smoothly connected.

[0011] Optionally, edges between adjacent micro-lens columns are smoothly connected by NURBS free-form surfaces.

[0012] Optionally, the micro-lens columns each have a radial dimension of 1-2 mm.

[0013] Optionally, the micro-lens columns each have a deviation angle between a lens column axis and a cylinder axis of the astigmatic lens within a preset range.

[0014] Optionally, the micro-lens columns each have a lens column axis that is consistent with a cylinder axis of the astigmatic lens.

[0015] According to another aspect of the present application, there is provided a pair of glasses comprising the astigmatic lens according to any one of the embodiments of the present application.

[0016] According to the astigmatic lens and the pair of glasses provided by the embodiments of the present application, the astigmatic lens comprises a central region and a surrounding region, the surrounding region is arranged around the central region, the radial dimension of the central region is greater than that of the surrounding region; the central region is arranged with a cylinder lens, and the surrounding region is arranged with a plurality of arrayed micro-lens columns, the refractive power of each micro-lens column gradually changes along different meridian directions, the difference between the refractive power of each micro-lens column and the refractive power of the central region gradually increases in a direction away from the central region, and the refractive power of each micro-lens column is less than the refractive power of the central region. Further, by arranging the micro-lens columns in the surrounding region of the astigmatic lens, the abrupt change of the refractive power of the astigmatic lens is relieved by the gradual change of the refractive power of the micro-lens columns, the magnification difference generated at the edge of the astigmatic lens is reduced, and the visual distortion is reduced, so that the wearer can reduce the dizziness when wearing the astigmatic lens, and the wearing experience is improved.

[0017] It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the present application or to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only show some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0019] Figure 1 is a structural schematic diagram of a cylindrical lens according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to enable persons skilled in the art to better understand the technical solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should fall within the scope of the present application.

[0021] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to include only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0022] Figure 1 is a structural schematic diagram of a cylindrical lens according to an embodiment of the present application. As shown in Figure 1 , the cylindrical lens comprises a central region 101 and a surrounding region 102, the surrounding region 102 is arranged around the central region 101, and the radial dimension of the central region 101 is greater than the radial dimension of the surrounding region 102.

[0023] Among them, the central region 101 is arranged with a cylindrical lens, and the surrounding region 102 is arranged with a plurality of arrayed micro-lenses 103, the refractive power of each micro-lens 103 gradually changes along different meridian directions, the difference between the refractive power of each micro-lens 103 and the refractive power of the central region 101 gradually increases in the direction away from the central region 101, and the refractive power of each micro-lens 103 is less than the refractive power of the central region 101.

[0024] It should be noted that the astigmatism diopter in the astigmatism lens is generally integrated into the near vision lens or the far vision lens. The astigmatism lens is generally an astigmatism cylinder. For example, when the astigmatism cylinder has a refractive power of-4.00D and the cylinder axis is 90°, it means that 4 diopters of vertical astigmatism need to be corrected. Due to the obvious difference in magnification between the edge, i.e., the surrounding area 102, and the central area 101 of the astigmatism cylinder, the object image at the edge is stretched or compressed, which causes the wearer to feel dizzy or giddy when turning the head or turning around. In the present application, the surrounding area 102 of the central area 101 is provided with an array of micro-cylinders 103, so that the overall refractive power of the original surrounding area 102 is dispersed. By gradually changing the refractive power of the micro-cylinders 103, the sudden change in the overall refractive power of the original surrounding area 102 is alleviated, thereby solving the dizziness of the wearer when turning the head or turning around, improving the clarity of the peripheral vision of the wearer, and reducing the deformation of the peripheral vision.

[0025] It can be understood that if the astigmatism lens is circular, the central area 101 (with a diameter of about 15-20 mm) of the astigmatism lens is designed with a traditional astigmatism cylinder to provide accurate astigmatism correction; and the surrounding area 102 (an area from about 20-30 mm in diameter outward, with a width of about 10 mm) of the astigmatism lens is provided with a micro-cylinder array. In this way, the performance of astigmatism correction can be ensured, and the dizziness of the wearer can be improved. Arranging the micro-cylinders too close to the center will affect the normal astigmatism correction, or arranging the micro-cylinders too close to the edge will not have the corresponding effect.

[0026] In the direction of the central area 101 pointing to the surrounding area 102, i.e., in the radial direction, the refractive power of each micro-cylinder 103 is slightly different. Through the gradual change of the optical properties of the micro-cylinder array, the gradual transition of the magnification in different meridional directions is realized, and the magnification difference at the edge of the traditional astigmatism lens is reduced. Since the steeper the curvature of the astigmatism lens is, the greater the refractive power is, and the flatter the curvature is, the smaller the refractive power is, the curvature of the astigmatism lens gradually becomes flatter from the center to the edge, and accordingly, the refractive power of each micro-cylinder 103 is smaller than that of the central area 101. By arranging the micro-cylinders 103 closer to the central area 101 in the radial direction of the astigmatism lens, the refractive power of the micro-cylinders 103 closer to the central area 101 is closer to that of the central area 101, and the refractive power of the micro-cylinders 103 farther from the central area 101 is farther from that of the central area 101, so as to reduce the edge aberration and reduce the weight and thickness of the astigmatism lens.

[0027] Optionally, one side surface of the astigmatism cylinder is spherical or aspherical, and the other side surface is cylindrical or toric.

[0028] It can be understood that the central region 101 is a cylindrical lens, when one side surface of the cylindrical lens is spherical or aspherical, it can be used as a myopic lens or a hyperopic lens, and when the other side surface is cylindrical or toric, it is a cylindrical lens for correcting astigmatism. Further, the function of superimposing astigmatism correction on the myopic lens or the hyperopic lens is realized. The toric lens has two mutually perpendicular radii of curvature on its surface (one direction has refractive power, and the other direction has different refractive power or zero refractive power), and is mainly used for correcting astigmatism.

[0029] That is, the central region 101 adopts a traditional cylindrical astigmatism correction design, that is, one side of the lens is spherical or aspherical, and the other side is cylindrical (or appropriate toric) to provide the required astigmatism correction. In this region, the optical performance of the lens is the same as that of a conventional astigmatism lens, and clear and accurate corrected vision is ensured in the main visual field of the wearer. The size (about 15-20 mm in diameter) of the central region 101 covers the visual field mainly used by the general eye in static vision, and therefore providing complete astigmatism correction in this region can meet most of the daily visual needs.

[0030] Optionally, the micro-cylindrical lenses 103 are closely arranged.

[0031] Reference is still made to Figure 1 The micro-cylindrical lens array structure is introduced in the peripheral annular region (i.e., the surrounding region) of the optical zone of the astigmatism lens. The array is closely inlaid by a plurality of micro-cylindrical lenses with a diameter in the range of 0.8-3 mm, and each micro-cylindrical lens is a small toric cylindrical lens. The micro-cylindrical lenses are arranged in a two-dimensional array on the surface of the lens, and there is no gap between adjacent micro-cylindrical lenses or only a very small gap, so as to ensure that the entire surrounding region is covered by the micro-cylindrical lenses without “exposed” base lens surface. The micro-cylindrical lenses at different positions in the array can be designed to have slightly different cylindrical lens refractive power or axial orientation, and the change follows the rule of gradual transition from the central region to the edge of the lens. That is, the closer to the edge of the lens, the smaller the difference in optical magnification of the micro-cylindrical lens compared with the central region, thereby compensating for the sharp change in magnification of the edge field in the traditional design.

[0032] Optionally, the shape of each micro-cylindrical lens 103 is polygonal or curved polygonal.

[0033] In one embodiment, the micro-lenses 103 are arranged in a regular or a random manner. When arranged in a regular manner, such as using regular triangle, square, or pentagon and hexagon tessellation, etc., the base lens is not exposed after the array of micro-lenses 103 is arranged, which is beneficial for optical simulation and can simplify the modeling and numerical control processing. When arranged in a random manner, the shapes of the micro-lenses are likely to be different, which is not conducive to simulation or numerical control processing, and has no periodicity, but can better disperse the refractive power of the surrounding area 102 and improve visual comfort.

[0034] In the above, the polygon is a polygon formed by straight lines, and the curved polygon is a polygon formed by curved lines. For example, the micro-lenses 103 can be arranged in the shape of only a polygon, in the shape of only a curved polygon, or in the shape of both a polygon and a curved polygon, which can better adapt to different lens shapes and better closely arrange the micro-lenses 103 while minimizing exposure of the base lens.

[0035] Optionally, the edges between adjacent micro-lenses 103 are smoothly connected.

[0036] In one embodiment, the edges between adjacent micro-lenses 103 are smoothly connected by NURBS free-form surfaces. In order to avoid visual discontinuity, the edges of each micro-lens unit are smoothly connected by NURBS free-form surfaces, so that the entire surrounding area actually forms a continuous free-form optical surface, but has locally differentiated optical refractive power in a micro sense. Such a design ensures that when the wearer moves his / her line of sight to the periphery of the lens, the size of the image seen by the wearer changes gradually and smoothly, and does not suddenly stretch or compress.

[0037] In the above, the smooth transition means that at the junction of adjacent micro-lenses, instead of simply intersecting the respective surfaces (which would form an edge or a step), the surfaces of the two units are gradually transitioned and merged in the boundary area by mathematical methods.

[0038] After such processing, even though the micro-lens array is designed by many micro-lenses, the actual lens surface manufactured will exhibit seamless and continuous curvature changes. For the wearer, there is no boundary line or step structure perceived on the lens, and the lens is visually equivalent to a continuous optical surface. The smooth surface transition also avoids scattering of light or sudden changes in aberration at the unit boundary, ensuring the stability of the image when the line of sight sweeps across the units.

[0039] To avoid optical abrupt changes or mechanical seams between the microcylinders, a continuous optical surface transition method is required. This means that at the boundaries of adjacent microcylinders, a smooth transition of curvature is achieved using methods such as NURBS (Non-Uniform Rational B-Splines) surface modeling. This ensures that although the entire lens surface is composed of numerous small units, it remains a smooth and continuous surface macroscopically, so the wearer will not perceive the existence of unit boundaries, thus avoiding scattering or abrupt aberrations.

[0040] The NURBS surface modeling method can be used to generate smooth transition surfaces for continuous optical surfaces. Specifically, given the curvature conditions of adjacent regions, control points and weights are set to ensure that the surface of the transition zone simultaneously satisfies the boundary conditions of the microlenses on both sides, achieving a smooth connection.

[0041] The NURBS surface is defined by two parameters (u, v), and its expression is:

[0042] ,in, For the coordinates of the control points, The weights of the corresponding control points, , : respectively Second-rate Spline basis functions. Among them, Spline basis functions are piecewise polynomial functions defined by nodal vectors that determine the shape of a surface within a parameter range. This represents the number of control point grids in the space. u and v are the curvature conditions of adjacent regions.

[0043] Optionally, the radial dimension of each microcylinder 103 is 1-2 mm.

[0044] In other words, the specific parameters of the microcylinder array need to be determined during the design process, including the size, shape, density, and refractive power distribution of each microcylinder unit. For example, the selection of the microcylinder diameter needs to comprehensively consider optical effects and smoothness: larger microcylinders (close to 3mm) can reduce the number of units and simplify manufacturing, but may result in less delicate array transitions; too many smaller microcylinders (approximately 1mm or less) may increase manufacturing difficulty and cause excessively frequent edge transition areas. The preferred implementation is to use a microcylinder diameter of approximately 1-2mm to achieve a balance between optical gradients and smooth manufacturing.

[0045] Optionally, the deviation angle between the cylinder axis of each micro-cylinder 103 and the cylinder axis of the astigmatic cylinder is within a preset range. Optionally, the cylinder axis of each micro-cylinder 103 is consistent with the cylinder axis of the astigmatic cylinder.

[0046] wherein the preset range can be 0°±a, wherein the astigmatism correction effect will be lost by about 3% to 3.3% per 1 degree of deviation, and when the deviation reaches 30 degrees, the effect of correcting astigmatism will completely disappear. Thus, a=30°, preferably 15°. In other embodiments, the value of a can be set according to the actual situation. That is, the cylindrical axis of the microlens needs to be consistent with or adjusted within a certain range of the overall lens cylindrical axis to ensure that the imaging transition in each direction is natural. For example, if the total astigmatism axis of the lens is horizontal 0°, the cylindrical axis of all the microlenses in the peripheral area is approximately parallel to the 0° axis, but can be slightly rotated to adjust in different radial directions to achieve balanced correction of distortion in each meridian direction.

[0047] In this way, the embodiment of the present application sets a microlens array in the peripheral area 102, and uses the microlens array to gradually transition the magnification difference in different meridian directions of the lens, thereby significantly reducing the image distortion caused by the edge area of the traditional high astigmatism lens. When the wearer looks at an object through the lens, the distortion is greatly reduced, and the straight lines and object shapes in the field of view are closer to the real shape, without obvious distortion or shaking. Due to the reduction of peripheral vision distortion, high astigmatism patients wearing the lens of the present application can more easily adapt, thereby reducing the discomfort symptoms such as dizziness and nausea caused by aberration. Compared with the traditional method of reducing astigmatism power to alleviate distortion, the present application allows to provide sufficient astigmatism correction while maintaining high comfort, shortens the adaptation time and improves the acceptance of the lens. The reduction of geometric distortion in the peripheral field of view makes the wearer's spatial perception of the environment more accurate, and the wearer will no longer feel that the ground is tilted or undulating due to the strong magnification effect of the lens edge. This is particularly important for daily walking or going up and down stairs, and the lens of the present application can help the wearer to maintain better balance and direction, thereby improving the safety of action. The present application still uses the traditional astigmatism design in the central area to ensure that the vision correction in the main visual range is not affected. The introduction of the peripheral microlens array does not weaken the optical performance of the central visual area, thereby balancing the vision correction effect and visual comfort. Furthermore, the present application greatly improves the visual experience while fully correcting the vision, has advantages that cannot be achieved by traditional astigmatism lenses, and provides a new corrective lens option for high astigmatism patients.

[0048] In one specific embodiment, as shown in Figure 1 the figure shows the division of the lens central area and the peripheral microlens array area. The central optical zone (15-20 mm in diameter) is marked by a dashed circle in the figure, and the traditional cylindrical design is used inside the central optical zone; the annular area outside the dashed circle is the peripheral area covered by the microlens array.

[0049] Lens prescription setup: Based on the patient's vision prescription, the basic parameters of the lens are determined. For example, set the sphere power S and cylinder power C (assuming C = -4.00 D, axis 90°, indicating the need to correct 4 diopters of vertical astigmatism). According to this prescription, the radius of curvature of the central area of the traditional cylinder lens can be calculated (or a central cylinder surface is generated using optical design software) to ensure that the S and C degree correction is accurate within a diameter of 15-20 mm in the central area.

[0050] Microcylinder array parameter design: Determine the configuration strategy of the peripheral microcylinder array. First, select the diameter of the microcylinder unit, and in this embodiment, a microcylinder unit with a diameter of about 2 mm is selected to balance the optical gradient effect and manufacturing difficulty. These microcylinder units are laid out in the edge annular zone (about 10-15 mm outside the radius). Use optical design software to create a digital model of the lens surface: start from the boundary of the central area, and place the microcylinder layer by layer around it. The cylinder power of each microcylinder is slightly lower than the cylinder power C of the central prescription, and gradually decreases to a lower value at the edge of the lens. For example, the first circle of microcylinders immediately adjacent to the central area may have a cylinder power of -3.75 D (slightly lower than the central -4.00 D), the next circle decreases to -3.50 D, and gradually decreases outward, until the outermost microcylinder of the lens decreases to about -2.00 D. The axis can also be fine-tuned as needed, but overall it remains consistent with the main axis 90° to smoothly transition the astigmatism correction strength. This refractive power decreasing scheme can be automatically generated by an algorithm, so that it forms a three-dimensional free-form surface that changes smoothly from the center to the edge.

[0051] Curved surface transition processing: To avoid the boundaries between microcylinder units forming optical discontinuities, the NURBS curved surface algorithm is used in the digital model to smoothly fit the junction area of adjacent microcylinders. Specifically, in the edge area of two adjacent microcylinder units, a transition curved surface is generated, and the curvature of the curved surface maintains the continuity of the first and second derivatives (i.e., the slope and curvature are continuous) when connecting the two microcylinders, so that there are no folds in the optical surface. This free-form surface transition design can be completed through computer-aided design, and an accurate numerical description of the entire lens surface is generated.

[0052] Mold making or direct machining: Based on the three-dimensional surface data of the lens completed according to the above design, select an appropriate manufacturing process to realize the physical lens. Two possible ways are:

[0053] Mold manufacturing and casting: Using ultra-precision machining equipment (such as single-point diamond turning lathe) to turn the negative surface of the lens (i.e. the mold surface is engraved with the opposite micro-lens array structure of the lens surface) on the metal mold blank. Diamond turning technology can reproduce complex free-form surfaces with nanometer-level surface roughness, including the fine structure of the micro-lens array. After the mold is processed, the optical resin (such as CR-39 resin or high refractive index resin material) is molded in the mold using injection molding or casting process to form a lens. After curing, the finished lens is removed, and the surface is provided with the designed micro-lens array structure.

[0054] Direct numerical control machining: Directly machining the free-form surface on the lens material blank (such as resin lens blank or glass blank). Using a five-axis numerical control grinding machine or laser processing equipment, according to the designed numerical control code, the micro-lens array and the topography of the central cylindrical area are engraved on the surface to be machined of the lens blank. In order to obtain an optical-grade surface, ultra-precision machining (UP machining) or synchronous polishing treatment is usually required. Because the lens surface of the present application contains a large number of micron-level unit structures, conventional polishing may weaken these details, so it is more suitable to use high-precision means such as non-wearing fine turning or ion beam polishing to directly obtain a smooth surface.

[0055] Coating and assembly: The processed lens usually needs to be coated with conventional optical film layers, such as anti-reflection film (anti-reflection film) and scratch-resistant hardening treatment. It is worth noting that the micro-lens array structure may require higher requirements for the coating process, which needs to ensure that the coating thickness on the microstructure surface is uniform and does not fill the details of the micro-lens array. Finally, the prepared lens is assembled into a finished pair of glasses, which is inspected to confirm that its optical parameters meet the design requirements and the wearing experience is good.

[0056] Through the above implementation steps, the micro-lens array-based astigmatism lens of the present application can be prepared. Actual wearing tests show that the lens provides clear astigmatism correction vision in the central vision, and effectively reduces the image distortion in the peripheral vision. The wearer can adapt to the lens in a short time, and the subjective feedback of the peripheral vision is more stable and natural. Thus, the effectiveness and superiority of the design scheme of the present application are verified.

[0057] Thus, the astigmatic lens proposed by the embodiments of the present application reduces visual distortion by special peripheral structure of the lens under the premise of ensuring accurate correction of central vision area. Specifically, the central area (about 15-20mm in diameter) of the lens adopts traditional cylindrical design to provide accurate astigmatism correction; and the peripheral area (from about 20-30mm in diameter) of the lens introduces an array structure composed of numerous small cylindrical units. Each small cylindrical unit is an independent toric cylindrical lens (i.e. a micro lens with astigmatism), and these small cylindrical lenses are closely arranged in the periphery of the lens, with slight differences in diopter in the array. Through the gradual change of the optical properties of the small cylindrical lens array, the gradual transition of magnification in different meridional directions is realized, and the magnification difference at the edge of the traditional astigmatic lens is reduced. At the same time, the non-uniform rational B-spline (NURBS) curve is used to transition between the small cylindrical lenses, so that the optical surface of the adjacent small cylindrical lenses is smoothly connected, avoiding the discontinuous surface of the ridge or step, thereby preventing obvious interference to the visual line.

[0058] According to another aspect of the present application, an eyeglass is provided, which includes the astigmatic lens according to any of the embodiments of the present application.

[0059] In summary, according to the astigmatic lens and the eyeglass proposed by the embodiments of the present application, the astigmatic lens includes a central area and a peripheral area, the peripheral area is arranged around the central area, the radial size of the central area is greater than that of the peripheral area; the central area is arranged with an astigmatic cylindrical lens, and the peripheral area is arranged with a plurality of arrayed small cylindrical lenses, the diopter of each small cylindrical lens gradually changes along different meridional directions, and the difference between the diopter of each small cylindrical lens and that of the central area gradually increases in the direction away from the central area, and the diopter of each small cylindrical lens is less than that of the central area. Further, by arranging the small cylindrical lenses in the peripheral area of the astigmatic lens, the abrupt change of the diopter of the astigmatic lens is alleviated by the gradual change of the diopter of the small cylindrical lenses, the magnification difference at the edge of the astigmatic lens is reduced, and the visual distortion is reduced, so that the wearer can reduce the dizziness when wearing the astigmatic lens, and the experience of the wearer is improved.

[0060] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An astigmatic lens, characterized in that, The application relates to a contact lens, comprising: a central area and a surrounding area, the surrounding area being arranged around the central area, the radial dimension of the central area being larger than that of the surrounding area; wherein the central area is arranged with a cylindrical lens for astigmatism, the surrounding area is arranged with a plurality of arrayed microlenses, the refractive power of each microlens is gradually changed along different meridian directions, the difference between the refractive power of each microlens and that of the central area gradually increases in the direction away from the central area, and the refractive power of each microlens is smaller than that of the central area; each microlens is closely arranged; the shape of each microlens is polygonal or curved polygonal; the edges between adjacent microlenses are smoothly connected, there is no gap overlap between adjacent microlenses, and the whole surrounding area is covered by the microlenses.

2. The astigmatic lens of claim 1, wherein, One side surface of the cylindrical lens for astigmatism is spherical or aspherical, and the other side surface is cylindrical or toric.

3. The astigmatic lens of claim 1, wherein, The edges between adjacent microlenses are smoothly connected through NURBS free-form surfaces.

4. The astigmatic lens of claim 1, wherein, The radial dimension of each microlens is 1-2 mm.

5. The astigmatic lens of claim 1, wherein, The deviation angle between the cylindrical axial direction of each microlens and the cylindrical axial direction of the cylindrical lens for astigmatism is within a preset range.

6. The astigmatic lens of claim 4, wherein, The cylindrical axial direction of each microlens is consistent with the cylindrical axial direction of the cylindrical lens for astigmatism.

7. Eyeglasses, characterized in that, The application further relates to a contact lens comprising the astigmatic lens as claimed in any one of claims 1-6.

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