Partitioned aspheric lens capable of correcting myopic presbyopia

Abstract

The invention belongs to the technical field of vision correction, and provides a partitioned aspherical lens capable of correcting myopic presbyopia, which comprises a lens body, the front surface of the lens body is a partitioned surface type, the rear surface of the lens body is a spherical surface type, and the lens body comprises an aspherical surface type optical area and a spherical surface type optical area. The spherical surface type optical area is annularly arranged on the outer side of the aspheric surface type optical area, the subarea surface type is composed of the front surface of the aspheric surface type optical area and the front surface of the spherical surface type optical area, and the spherical surface type is composed of the rear surface of the aspheric surface type optical area and the rear surface of the spherical surface type optical area. According to the invention, the surface type of the optical region on the surface of the glasses is partitioned and the size of the region is limited, so that the optical performance of the lens is improved, good distant vision, middle vision and near vision are provided, and astigmatism is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of vision correction, and in particular relates to a partitioned aspheric lens capable of correcting myopia and presbyopia. Background Art

[0002] When the normal human eye is in its natural, unaccommodated state, an image of an infinitely distant object is precisely formed on the retina. When observing objects up close, the human eye utilizes the lens's inherent accommodation power to achieve clear near vision by reducing the radius of curvature of the lens's front surface. However, with aging, the lens's ability to accommodate gradually decreases, leading to the development of presbyopia, a phenomenon in which people with presbyopia only see images clearly at a certain distance. With the increasing elderly population in my country, the correction of presbyopia has garnered increasing attention and created a significant market.

[0003] The most traditional method of correcting presbyopia is frame glasses. General frame glasses have only a specific refractive power and can only see objects at a specific distance (generally near distance) but cannot achieve clear visual quality of continuous vision. In order to overcome the shortcomings of the single focus of ordinary presbyopic glasses, multifocal glasses, progressive multifocal glasses and other designs have been proposed and applied to the market. However, multifocal glasses often have "image jump" phenomenon at the intersection of different focal points, and cannot obtain continuous clear visual quality; the introduction of progressive multifocal glasses design solves the problem of image jump. In 1989, Winthrop et al. proposed a direct method for progressive multifocal glasses design in patent US5123725A, including: proposing a continuous and smooth change function of meridian optical power, a contour line function intersecting with it, a curvature center design, and a vector height expression design. Although the design achieves continuous clear vision, it does not effectively control the peripheral astigmatism of the lens, resulting in large astigmatism and reduced visual quality. In 1998, J. Loos et al. proposed an optimization function for the indirect design of progressive multifocal glasses, which gave different weight distribution controls to the optical power distribution and astigmatism level of the lens to achieve improved optical performance. Since there is a contradiction between the change in optical power of progressive multifocal glasses and the minimization of astigmatism, finding the best balance between the two requirements is the main challenge faced by the indirect method. An important part of the design optimization of progressive multifocal lenses is to reduce the astigmatism of the lens in the peripheral field of view. In 2012, Wang Zhaoqi et al. proposed a non-spherical eye lens design for correcting myopia and presbyopia in patent CN102662252A, which achieved a continuous visual range of clear vision from infinity to 500mm based on a personalized human eye model, but the peripheral astigmatism of the lens was not analyzed. In addition, since this method is based on the design of a personalized human eye model, it requires the collection of a large amount of clinical data, which limits the promotion and application of this technology.

[0004] Because my country is a country with a high rate of myopia, some people with myopia experience both myopia and presbyopia as they age. For these people, as presbyopia is just beginning, the lens still has a certain degree of accommodation. Therefore, designing and developing lenses that provide clear vision from infinity to 450mm and effectively control peripheral astigmatism for this group of people with both myopia and presbyopia is of great value. Summary of the Invention

[0005] The purpose of the present invention is to provide a partitioned aspheric lens that can correct myopia and presbyopia to solve the above-mentioned problems, so as to achieve the purpose of improving the optical performance of the lens by partitioning the surface shape of the optical zone of the lens surface and limiting the size of the zone, providing good far vision, intermediate vision, and near vision, and effectively reducing astigmatism.

[0006] To achieve the above-mentioned object, the present invention provides the following solution: a partitioned aspheric lens capable of correcting myopia and presbyopia, comprising:

[0007] A lens body, wherein the front surface of the lens body is a partitioned surface type, the back surface of the lens body is a spherical surface type, the lens body includes an aspherical surface type optical zone and a spherical surface type optical zone, the spherical surface type optical zone is arranged on the outside of the aspherical surface type optical zone, the partitioned surface type is composed of the front surface of the aspherical surface type optical zone and the front surface of the spherical surface type optical zone, and the spherical surface type is composed of the back surface of the aspherical surface type optical zone and the back surface of the spherical surface type optical zone.

[0008] Preferably, the front surface of the aspheric surface type optical zone is an even-order aspheric surface, the front surface of the spherical surface type optical zone is a spherical surface, and the partitioned surface type is composed of the even-order aspheric surface and the spherical surface.

[0009] Preferably, the rear surface of the aspherical optical zone is a first spherical surface type, the rear surface of the spherical optical zone is a second spherical surface type, and the spherical surface type is composed of the first spherical surface type and the second spherical surface type.

[0010] Preferably, the spherical surface type optical zone and the aspherical surface type optical zone are transitionally connected via a partitioned annular zone.

[0011] Preferably, the surface sag of the even-order aspheric surface is expressed as:

[0012]

[0013] Where c is the curvature at the vertex of the aspheric surface, r is the radial distance from any point on the aspheric surface to the optical axis, k is the quadratic surface coefficient, and α1-α6 are the aspheric coefficients of each order.

[0014] Preferably, the lens body is made of resin, glass, PC sheet or other materials that can be used for processing lenses.

[0015] Preferably, the zoned face shape includes a central vision zone and a peripheral astigmatism correction zone.

[0016] Preferably, the radius of the central visual zone is 15.5 mm to 16.0 mm, and the radius of the peripheral astigmatism correction zone is 16.0 mm to 30.0 mm.

[0017] Preferably, the center thickness of the aspherical surface optical zone is 2.0 mm to 2.5 mm, and the edge thickness is 2.5 mm to 3.5 mm.

[0018] Preferably, the center thickness of the spherical optical zone is 2.0 mm to 2.5 mm, and the edge thickness is 2.5 mm to 3.5 mm.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] 1. The partitioned aspheric lens of the present invention adopts a surface partition splicing method, and the smooth transition between the two annular zones reduces the peripheral astigmatism of the aspheric lens, avoids the image blur caused by astigmatism and the degradation of visual quality caused by the uneven transition. The front surface is set to a partitioned surface. By optimizing the aspheric coefficient, the lens provides continuous clear imaging in the near and far vision range, so that the image quality remains basically stable within the pupil change range of 2.8mm to 4.5mm, and the image quality remains basically stable in bright and dark light environments.

[0021] 2. The partitioned aspheric lens of the present invention provides visual quality in hyperopia that is almost equivalent to that of emmetropia, provides good visual quality for near-distance vision, and provides continuous and clear imaging. It has a certain universality for people who have just begun to develop presbyopia but still have a certain degree of accommodation power in the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic structural diagram of the partitioned aspherical lens of the present invention;

[0024] Figure 2 1 is a side view schematic diagram of a partitioned aspheric lens of the present invention;

[0025] Figure 3 1 is a side view of the partitioned aspheric lens of the present invention in a myopia model optimized based on the Navarro eye model at different viewing distances;

[0026] Figure 4 The MTF curve of the image plane of the partitioned aspheric lens of the present invention at a viewing distance of 6000 mm in a myopic eye model optimized based on the Navarro eye model, under the conditions of a bright vision environment and a pupil size of 2.8 mm;

[0027] Figure 5 The MTF curve of the image plane of the partitioned aspheric lens of the present invention at a viewing distance of 2000 mm in a myopic eye model optimized based on the Navarro eye model, under the conditions of a bright vision environment and a pupil size of 2.8 mm;

[0028] Figure 6 The MTF curve of the image plane of the partitioned aspheric lens of the present invention at a viewing distance of 450mm in a myopic eye model optimized based on the Navarro eye model, under the conditions of a bright vision environment and a pupil size of 2.8mm;

[0029] Figure 7 The MTF curve of the image plane of the partitioned aspheric lens of the present invention at a viewing distance of 6000 mm in a myopic eye model optimized based on the Navarro eye model, under the conditions of a dark visual environment and a pupil size of 4.5 mm;

[0030] Figure 8 The MTF curve of the image plane of the partitioned aspheric lens of the present invention at a viewing distance of 2000 mm in a myopic eye model optimized based on the Navarro eye model, under the conditions of a dark visual environment and a pupil size of 4.5 mm;

[0031] Figure 9 MTF curve of the image plane of the partitioned aspheric lens of the present invention at a viewing distance of 1000 mm in a myopia model optimized based on the Navarro eye model, in a dark vision environment with a pupil size of 4.5 mm;

[0032] Figure 10 is an astigmatism contour map of the partitioned aspheric lens of the present invention;

[0033] Among them, 1. The front surface of the aspherical optical zone; 2. The front surface of the spherical optical zone; 3. The partition ring; 4. The front surface of the lens body; 5. The back surface of the lens body; 6. The boundary of the lens body. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figures 1 and 2 The present invention provides a partitioned aspheric lens capable of correcting myopia and presbyopia, comprising:

[0037] The lens body, the front surface 4 of the lens body is a partitioned surface type, the back surface 5 of the lens body is a spherical surface type, the lens body includes an aspherical surface type optical zone and a spherical surface type optical zone, the spherical surface type optical zone is arranged on the outside of the aspherical surface type optical zone, the partitioned surface type is composed of the front surface 1 of the aspherical surface type optical zone and the front surface 2 of the spherical surface type optical zone, and the spherical surface type is composed of the back surface of the aspherical surface type optical zone and the back surface of the spherical surface type optical zone.

[0038] According to a further optimization scheme, the front surface 1 of the aspheric surface type optical zone is an even aspheric surface, the front surface 2 of the spherical surface type optical zone is a spherical surface, and the partitioned surface type is composed of an even aspheric surface and a spherical surface.

[0039] According to a further optimization scheme, the back surface of the aspherical optical zone is a first spherical surface type, the back surface of the spherical optical zone is a second spherical surface type, and the spherical surface type is composed of the first spherical surface type and the second spherical surface type.

[0040] According to a further optimized solution, the spherical optical zone and the aspherical optical zone are transitionally connected via a partition ring 3.

[0041] Further optimization scheme, the surface height of the even aspheric surface is expressed as:

[0042]

[0043] Wherein, c is the curvature at the vertex of the aspheric surface, r is the radial distance from any point on the aspheric surface to the optical axis, k is the quadratic surface coefficient, and α1-α6 are aspheric coefficients of various orders, which in this embodiment are aspheric coefficients from 2nd order to 6th order.

[0044] To further optimize the solution, the lens body can be made of resin, glass, PC sheet or other materials that can be used for lens processing.

[0045] To further optimize the solution, the partitioned face shape includes a central vision area and a peripheral astigmatism correction area.

[0046] According to the further optimization scheme, the radius of the central visual zone is 15.5mm~16.0mm, and the radius of the peripheral astigmatism correction zone is 16.0mm~30.0mm.

[0047] According to the further optimization scheme, the center thickness of the aspheric optical zone is 2.0mm~2.5mm, and the edge thickness is 2.5mm~3.5mm.

[0048] According to the further optimization scheme, the center thickness of the spherical optical zone is 2.0mm~2.5mm, and the edge thickness is 2.5mm~3.5mm.

[0049] Specifically, in this embodiment, the outer diameter of the lens body is 60 mm, and the radius of the partitioned annulus is 15 mm. The parameters of each area on the front surface of the lens body are shown in Table 1, where R is the surface curvature radius, Conic is the conic coefficient, and R is the aspheric coefficient. The unit of R is millimeters (mm). Light entering the lens system passes through the different partitions, achieving continuous and clear imaging across the entire visual range, from far to near distance. Furthermore, the curvature of the two partitioned annulus zones varies minimally, with a smooth transition and no sudden change in visual quality.

[0050] Table 1

[0051]

[0052] In this embodiment, studies have shown that the size and accommodation ability of the human pupil decrease with age. Considering that the population targeted by this application is mostly elderly people, their pupil diameter is smaller than normal and their accommodation ability is insufficient, the specific sizes are shown in Table 2.

[0053] Table 2

[0054] Age (years) Daytime (mm) Night (mm) Change (mm) 20 4.7 8.0 3.3 30 4.3 7.0 2.7 40 3.9 6.0 2.1 50 3.5 5.0 1.5 60 3.1 4.1 1.0 70 2.7 3.2 0.5 80 2.3 2.5 0.2

[0055] In this embodiment, 2.8 mm is selected as the pupil diameter under photopic vision conditions, and 4.5 mm is selected as the pupil diameter under scotopic vision conditions.

[0056] Figure 3 As shown, this embodiment is incorporated into a myopia model optimized based on the Navarro eye model to form a lens-eye simulation system, and imaging quality simulations are performed under different viewing distances. The diopter is the reciprocal of the object distance, e.g., 0 diopter corresponds to an object distance of infinity, 0.5 diopter corresponds to an object distance of 2 meters, and 2.2 diopter corresponds to an object distance of approximately 0.45 meters.

[0057] like Figures 4-6The figure below shows the MTF curve on the image plane of the lens-eye system model under photopic conditions and a pupil size of 2.8mm. The horizontal axis represents the spatial frequency in line pairs per millimeter (lp / mm); the vertical axis represents the MTF value. MTF (spatial modulation frequency) intuitively demonstrates the resolution and contrast of a partitioned aspheric lens, is closely related to the imaging quality of an optical system, and is often used as a criterion for evaluating the imaging quality of an optical system. Figures 4-5 It can be seen that in this embodiment, from 6 meters (considered as infinity) to 2 meters, at a spatial frequency of 100lp / mm, the MTF value is above 0.2, which meets the needs of far and medium vision in daily life under bright vision environment, and has good imaging quality. Figure 6 It can be seen that in this embodiment, from a range of 2 meters to 0.45 meters, at a spatial frequency of 100lp / mm, the MTF value is above 0.1, which meets the needs of near vision in daily life under bright vision environment and has good imaging quality.

[0058] like Figures 7-9 As shown in Figure 1, the MTF curve on the image plane of the lens-eye system model in a dark vision environment with a pupil size of 4.5mm. Figures 7-9 It can be seen that in this embodiment, within the range of 6 meters (considered as infinity) to 1 meter, at a spatial frequency of 100lp / mm, the MTF value is above 0.2, which meets the needs of far and middle vision in daily dark visual environments and has good imaging quality.

[0059] like Figure 10 As shown, within the partition ring zone 3 of R=15mm, the astigmatism level of the present embodiment is less than 0.5 diopters, and the aspheric surface optical zone astigmatism of the present embodiment is small, which meets the light and dark vision conditions of daily life and has little impact on visual quality; between the partition ring zone of R=15mm and the lens body boundary 6 of R=30mm, the astigmatism level of the present embodiment is less than 1.0 diopters, and the peripheral astigmatism of the present embodiment is small, which meets the light and dark vision conditions of daily life and has little impact on visual quality.

[0060] In summary, the partitioned aspheric lens and design method for correcting myopia and presbyopia proposed in this embodiment have good optical performance in the range from infinity to 0.45m in a bright vision environment; and have good optical performance in the range from infinity to 1m in a dark vision environment; and the imaging performance of the partitioned aspheric lens is basically unaffected by pupil changes.

[0061] It is worth noting that this embodiment is not limited to partitions distributed on the front surface, and the partitions are not limited to two areas. Any design with alternating continuous visual range areas on the front or rear surface is within the scope of protection of this application.

[0062] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A partitioned aspheric lens capable of correcting myopia and presbyopia, characterized in that: include: A lens body, wherein the front surface (4) of the lens body is a partitioned surface type, the rear surface (5) of the lens body is a spherical surface type, the lens body includes an aspherical surface type optical zone and a spherical surface type optical zone, the spherical surface type optical zone is arranged on the outside of the aspherical surface type optical zone, the partitioned surface type is composed of the front surface (1) of the aspherical surface type optical zone and the front surface (2) of the spherical surface type optical zone, and the spherical surface type is composed of the rear surface of the aspherical surface type optical zone and the rear surface of the spherical surface type optical zone.

2. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The front surface (1) of the aspheric surface type optical zone is an even-order aspheric surface, the front surface (2) of the spherical surface type optical zone is a spherical surface, and the partitioned surface type is composed of the even-order aspheric surface and the spherical surface.

3. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The rear surface of the aspherical optical zone is a first spherical surface type, the rear surface of the spherical optical zone is a second spherical surface type, and the spherical surface type is composed of the first spherical surface type and the second spherical surface type.

4. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The spherical surface type optical zone and the aspherical surface type optical zone are transitionally connected via a partition ring zone (3).

5. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 2, characterized in that: The surface sag of the even-order aspheric surface is expressed as: Where c is the curvature at the vertex of the aspheric surface, r is the radial distance from any point on the aspheric surface to the optical axis, k is the quadratic surface coefficient, and α1-α6 are the aspheric coefficients of each order.

6. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The lens body is made of resin, glass, PC sheet or other materials that can be used for processing lenses.

7. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The partitioned face shape includes a central vision zone and a peripheral astigmatism correction zone.

8. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 7, characterized in that: The radius of the central visual zone is 15.5 mm to 16.0 mm, and the radius of the peripheral astigmatism correction zone is 16.0 mm to 30.0 mm.

9. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The central thickness of the aspherical optical zone is 2.0 mm to 2.5 mm, and the edge thickness is 2.5 mm to 3.5 mm.

10. The partitioned aspheric lens for correcting myopia and presbyopia according to claim 1, characterized in that: The center thickness of the spherical optical zone is 2.0 mm to 2.5 mm, and the edge thickness is 2.5 mm to 3.5 mm.

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