Toroidal multi-focal lens

Abstract

The utility model relates to a toroidal multifocal lens in the technical field of toroidal lenses. The design surface of a single microlens in a lenticular and meridian microlens array structure is one of a spherical surface, an aspheric surface and a toroidal surface; the meridian is divided into a transverse direction and a vertical direction, and the focal power distribution in the meridian direction is equal to the focal power distribution in the vertical meridian direction. Essentially, each meridian line of the spherical lens is adjusted by a correction factor required by a specific diopter; the meridian diopters of the spherical lens and the cylindrical lens and all diopters between the spherical lens and the cylindrical lens are optimized properly; therefore, astigmatism defocus in different directions is formed, the requirements of retina peripheral astigmatism axial positions of different teenagers are met, hyperopia defocus compensation can be carried out in the myopia defocus area and the hyperopia defocus correction area, and peripheral hyperopia defocus correction can still be obtained when the retina is in the intermittent period of micro-lens myopia defocus alternation.

Description

Technical Field

[0001] This utility model relates to the field of toroidal lens technology, and in particular to a toroidal multifocal lens. Background Technology

[0002] Controlling peripheral hyperopic defocus and using overcorrection design to suppress axial elongation in adolescents through myopic defocus, thereby slowing down the progression of myopia, has become a recognized optical method for intervening in adolescent myopia in recent years. Multi-toroidal high-order aberration digital lenses are also one of the popular methods in recent years. For example, Chinese patent application number CN202022272321.0 describes a personalized peripheral myopia defocus lens. The inner surface of the lens is an asymmetric toroidal surface, and 10 optical power compensation reference points are distributed on the lens. These reference points are located at the intersections of the line of sight of the myopic patient in each visual direction with the lens. The optical power compensation value of each optical power compensation reference point is 105% to 120% of the difference between the refractive power of the corresponding myopic patient's uncorrected eye in each visual direction and the patient's emmetropic refractive power. The visual directions include 10, 20, and 30 degrees on the nasal side, 10, 20, and 30 degrees on the temporal side, 10 and 20 degrees for upward distance vision, and 10 and 20 degrees for downward near vision.

[0003] However, when wearers are correcting cylindrical refractive errors exceeding 0.50D, traditional lens designs cannot adequately address the peripheral optical performance of lenses containing cylindrical refractive errors, thus affecting the wearer's cylindrical correction of astigmatism. Utility Model Content

[0004] To address the problem mentioned in the background art that traditional lens designs cannot adequately address the peripheral optical performance of lenses containing cylindrical refractive power when correcting astigmatism with a cylindrical refractive power exceeding 0.50D, thus affecting the wearer's ability to correct astigmatism with cylindrical lenses, this utility model provides the following technical solution:

[0005] A toroidal multifocal lens includes a spherical lens, the spherical lens including a central visual zone for correcting refractive errors of the eye, a myopia defocus zone within the spherical lens for forming myopia defocus and astigmatic defocus in different directions around the retina, and a hyperopia defocus correction zone outside the myopia defocus zone for correcting hyperopia defocus around the retina.

[0006] The spherical lens contains a cylindrical lens, and the spherical lens contains a meridian line for working with the cylindrical lens to correct the refractive power of the eye.

[0007] Furthermore, the central visible area is located in a circle outward from the optical center of the spherical lens, and the myopia defocus area and the hyperopia defocus correction area are distributed outside the central visible area.

[0008] Furthermore, there are several myopia defocus zones, which are formed by superimposing a microlens array structure on the design surface for reducing paracentric hyperopia defocus. The remaining areas on the design surface for reducing paracentric hyperopia defocus are hyperopia defocus correction zones.

[0009] Furthermore, there are several hyperopia defocus correction areas, which are arranged in a circular array outside several myopia defocus areas, and the area ratio of the hyperopia defocus correction area to the myopia defocus area is 1:0.3 to 1.5.

[0010] Furthermore, the design surface of each microlens in the cylindrical and meridional microlens array structure is one of the following: spherical, aspherical, toroidal, or torus.

[0011] Furthermore, the meridian is divided into two types: horizontal and vertical. The optical power distribution along the meridian is equal to the optical power distribution along the vertical meridian.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] By setting a central visible zone, a myopia defocus zone, and a hyperopia defocus correction zone, each meridian 1 of the spherical lens is essentially adjusted with the correction factor required for a specific refractive power. This ensures that the meridional refractive power of the spherical and cylindrical lenses, as well as all refractive powers in between, are properly optimized. This creates astigmatic defocus in different directions to meet the needs of different peripheral astigmatic axes in the retinas of adolescents. Furthermore, both the myopia defocus zone and the hyperopia defocus correction zone can provide hyperopia defocus compensation, avoiding the need for peripheral hyperopia defocus correction during the intermittent periods when the retina is in a state of alternating myopia defocus and microlensing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 These are different aspherical diagrams of the spherical lens and the meridian of this utility model;

[0016] Figure 3 This is the spherical meridian diopter diagram of this utility model;

[0017] Figure 4 This is the aspherical meridian refractive power diagram of this utility model;

[0018] Figure 5 This is a refractive index diagram of any meridian of this utility model.

[0019] The following is a list of component names represented by the reference numerals in the attached figures:

[0020] 100 - spherical lens, 101 - cylindrical lens, 102 - meridian;

[0021] 200-Center Visible Area

[0022] 300 - Myopic defocus zone;

[0023] 400 - Hyperopia defocus correction zone. Detailed Implementation

[0024] The preferred embodiments of this utility model are described in detail below, and a clear and complete explanation is given in conjunction with the accompanying drawings.

[0025] Please see Figures 1-5 This utility model provides a super-toroidal multifocal lens.

[0026] It includes a spherical lens 100, which includes a central visual zone 200 for correcting refractive errors of the eye, a myopia defocus zone 300 within the spherical lens 100 for forming myopia defocus and astigmatism defocus in different directions around the retina, and a hyperopia defocus correction zone 400 outside the myopia defocus zone 300 for correcting hyperopia defocus around the retina.

[0027] The spherical lens 100 is a double-sided composite defocused myopia lens made of polycarbonate with a refractive index of 1.59 and a central power of -4.00D. The upper mold base of the lens is made of metal with a microlens array surface. The base curvature at the vertex of the working surface is -1.50D. The microlens array uses a continuous ring-shaped microlens array and individual microlens with spherical curved surfaces. Each individual microlens has a positive power of 3.00D and is arranged in a ring-like pattern outwards, resulting in a circular power distribution. The power variation is as follows: Figure 2 As shown, the microlens array surface formed by thermoplastic processing acts on the front surface of the lens, and the defocusing design surface that reduces peripheral hyperopia acts on the rear surface of the lens.

[0028] A cylindrical lens 101 is provided inside the spherical lens 100, and a meridian 102 is provided inside the spherical lens 100 for cooperating with the cylindrical lens 101 to correct the refractive power of the eye.

[0029] The central visible area 200 is located in a circle outward from the optical center of the spherical lens 100, and the myopia defocus area 300 and the hyperopia defocus correction area 400 are distributed outside the central visible area 200. There are several myopia defocus areas 300, which are formed by superimposing a microlens array structure on the design surface for reducing paracentral hyperopia defocus. The remaining area on the design surface for reducing paracentral hyperopia defocus is the hyperopia defocus correction area 400. There are several hyperopia defocus correction areas 400, which are arranged in a circular array outside the several myopia defocus areas 300, and the area ratio of the hyperopia defocus correction area 400 to the myopia defocus area 300 is 1:0.3 to 1.5. The hypertoroidal characteristic of the spherical lens 100 is an extension of the aspherical design technology, allowing lens designers to optimize the refractive power of the spherical and cylindrical lenses. This ensures that almost all wearers enjoy the same wide field of vision, especially those with astigmatism.

[0030] The toroidal spherical lens 100 offers a significantly wider field of view and consistently delivers superior optical performance compared to conventional lens designs for most diopter powers—especially in terms of higher cylindrical power. Let's examine the differences between the optimal form, aspherical, and toroidal optimization strategies used in actual prescriptions.

[0031] Through the rational configuration of the central visual area 200, the myopia defocus area 300, and the hyperopia defocus correction area 400, the central visual area 200 of the lens corrects refractive errors by focusing the image onto the fovea centralis of the retina. The composite myopia defocus area 2300 has a gradually increasing defocus amount, enabling peripheral objects to be focused in front of the retina. Simultaneously, the hyperopia defocus correction area 400 corrects hyperopia defocus. Both the myopia defocus area 300 and the hyperopia defocus correction area 400 can compensate for hyperopia defocus, preventing peripheral hyperopia defocus correction from being achieved even during the intervals between myopia defocus and microlens shifts on the retina. In contrast, traditional microlens array designs result in hyperopia defocus in non-microlens areas, where parallel light rays are focused behind the retina, lacking hyperopia defocus correction and significantly reducing the functionality of such products.

[0032] The design surface of a single microlens in the microlens array structure of cylindrical lens 101 and meridian 102 is one of spherical, aspherical, super-toroidal, or toroidal surfaces; the meridian 102 is divided into two types: transverse and vertical, and the optical power distribution in the direction of the meridian 102 is equal to the optical power distribution in the direction perpendicular to the meridian 102.

[0033] The individual microlenses in the microlens array structure of cylindrical lens 101 and meridian 102 are designed with a surface that is spherical, aspherical, or toroidal; among them, for example... Figure 3The spherical meridian 102 diopter described above has a relative value of 0.0 on meridian 102, meaning it is perfectly spherical in every direction. Therefore, the +2.00D spherical meridian receives the same correction factor of 0.0 as the +1.00D cylindrical meridian. We know that these two diopters should be optimized differently because the +1.00D diopter requires a flatter base curve than the +2.00D diopter.

[0034] like Figure 4 The aspherical meridian 102 diopter described herein has a relative value of -4.0, indicating that the aspherical lens deviates significantly from the spherical lens along each meridian 102. This is what "rotational symmetry" means—the lens surface has the same curvature in every direction, which can be produced by simply rotating a curve and using an appropriate relative aspherical power. Similarly, the aspherical lens provides only a correction factor of -4.0 across each meridian.

[0035] like Figure 5 The diopter of any meridian 102 described herein, note how the relative aspheric power changes from meridian 102 to meridian 102; the correction factor for +2.00D meridian 102 is -4.0, while the correction factor for +1.00D meridian 102 is -1.5; essentially, each meridian 102 of the lens is adjusted with the correction factor required for a specific diopter; this ensures that the diopter of the spherical lens 100 and the cylindrical lens 101 at meridian 102, as well as all diopters in between, are properly optimized. This results in astigmatic defocus in different directions to meet the needs of different peripheral astigmatic axes in the retina of adolescents.

[0036] Based on the above description and accompanying drawings, those skilled in the art can understand and implement this utility model. Furthermore, any non-creative modifications made to this utility model by those skilled in the art without inventive effort are still within the protection scope of this utility model.

Claims

1. A super-toroidal multifocal lens, comprising a spherical lens (100), characterized in that: The spherical lens (100) includes a central visual area (200) for correcting refractive errors of the eye. The spherical lens (100) is provided with a myopia defocus area (300) for forming myopia defocus and astigmatism defocus in different directions around the retina. The myopia defocus area (300) is provided with a hyperopia defocus correction area (400) for correcting hyperopia defocus around the retina. The spherical lens (100) contains a cylindrical lens (101), and the spherical lens (100) contains a meridian (102) for use in conjunction with the cylindrical lens (101) to correct the refractive error of the eye.

2. The toroidal multifocal lens according to claim 1, characterized in that: The central visible area (200) is located in a circle outward from the optical center of the spherical lens (100), and the myopia defocus area (300) and the hyperopia defocus correction area (400) are distributed outside the central visible area (200).

3. A toroidal multifocal lens according to claim 2, characterized in that: There are several myopic defocus zones (300).

4. A toroidal multifocal lens according to claim 3, characterized in that: There are several hyperopia defocus correction areas (400), and the several hyperopia defocus correction areas (400) are arranged in a circular array outside the several myopia defocus areas (300), and the area ratio of the hyperopia defocus correction area (400) to the myopia defocus area (300) is 1:0.3 to 1.

5.

5. A toroidal multifocal lens according to claim 2, characterized in that: The design surface of each microlens in the microlens array structure of the cylindrical lens (101) and the meridian (102) is one of the following: spherical, aspherical, or toroidal.

6. A toroidal multifocal lens according to claim 5, characterized in that: The meridian (102) is divided into two types: horizontal and vertical. The optical power distribution in the direction of the meridian (102) is the same as that in the direction of the vertical meridian (102).

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