CN219625832U

CN219625832U - Myopia control lens and glasses

Info

Publication number: CN219625832U
Application number: CN202321238750.3U
Authority: CN
Inventors: 吴晋芳; 金子兵; 章培培; 张馨予
Original assignee: Beijing Tianming Ophthalmic New Technology Development Co; BEIJING INSTITUTE OF OPHTHALMOLOGY; Beijing Tongren Hospital
Current assignee: Beijing Tianming Ophthalmic New Technology Development Co; BEIJING INSTITUTE OF OPHTHALMOLOGY; Beijing Tongren Hospital
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2023-09-01
Anticipated expiration: 2033-05-19

Abstract

The utility model provides a myopia control lens and glasses, which comprise a lens body, wherein the front surface of the lens body is divided into a far-use area, a near-use area and a gradual change area, and the gradual change area is positioned between the far-use area and the near-use area; the far-field comprises a far-field optical zone and a far-field defocusing zone surrounding the far-field optical zone, a plurality of defocusing lenses with the surfaces in the shape of convex cambered surfaces are distributed in the far-field defocusing zone, and the plurality of defocusing lenses are distributed on a plurality of concentric circles taking the center of the far-field optical zone as the circle center; wherein, the refractive powers of a plurality of defocused lenses on the same concentric circle are equal; the more the power of the defocus lenses on the concentric circles that are equal or outside the power of the plurality of defocus lenses on the different concentric circles is, the greater the power of the defocus lenses. Based on the technical scheme of the utility model, the far-vision defocusing structure is optimally designed, and the defocusing lens is adopted to form gradient peripheral defocusing, so that the defocusing signal generated by the lens is more attached to the radian of retina, and the far-vision control effect is better.

Description

Myopia control lens and glasses

Technical Field

The utility model relates to the technical field of glasses lenses, in particular to a myopia control lens and glasses.

Background

Myopia is one of ametropia. When the eye is in a condition of accommodation relaxation, parallel rays enter the eye, which focus in front of the retina, which results in the inability to form a clear image on the retina, known as myopia. Accommodation is the process by which the human eye images near objects on the retina by changing the refractive power of the lens, and accommodation response is the actual amount of accommodation that an individual produces in response to an accommodation stimulus. The occurrence and development of myopia are closely related to the regulating power, ciliary muscle spasm can be caused by long-time short-distance eye use, regulating power is reduced, regulating parameters are changed, and myopia is induced.

Most of the frame glasses for controlling myopia progression on the market are currently retinal peripheral defocus glasses. The designs can be roughly divided into a middle far optical zone and a peripheral defocus zone, and the designs can realize better defocus and central imaging effects during far vision, but due to convergence of eyes during near vision, the intersection point of the sight line and the lens deviates, and enters the defocus zone, so that the visual effect during near vision is poor. And the peripheral defocus amount generated by the lens is changed along with the change of the eye accommodation reaction, and a stable defocus amount cannot be formed.

Various technical solutions for improving the defocused glasses exist in the prior art. Chinese patent document CN203849514U discloses a wide-field peripheral defocus spectacle lens, which is designed to achieve control of myopia by combining peripheral defocus with designing regions such as far vision region and near vision region for regional division of the lens. However, this solution still has some drawbacks, such as no further design for presbyopia peripheral defocus and imperfect myopia control.

Disclosure of Invention

In order to solve the problem of imperfect myopia control effect of the myopia lenses in the prior art, the utility model provides a myopia control lens and glasses.

In a first aspect, the utility model provides a myopia control lens, comprising a lens body, wherein the front surface of the lens body is a progressive surface, the rear surface of the lens body is a progressive surface or a spherical surface, the front surface is divided into a far zone, a near zone and a gradual zone, and the gradual zone is positioned between the far zone and the near zone;

the remote zone comprises a remote optical zone and a remote defocusing zone surrounding the remote optical zone, a plurality of defocusing lenses with the surfaces in the shape of convex cambered surfaces are distributed in the remote defocusing zone, and the plurality of defocusing lenses are distributed on a plurality of concentric circles taking the center of the remote optical zone as the center of a circle;

wherein the refractive powers of the plurality of defocus lenses on the same concentric circle are equal; the power of the defocus lenses on the concentric circles on which the power of the plurality of defocus lenses on different concentric circles is equal or the more outside is larger.

In one embodiment, the optical power of the distance optical zone is a, the optical power of the defocus lens on the innermost concentric circle is a+min, the optical power of the defocus lens on the outermost concentric circle is a+max, and the following are satisfied: min= (2.0-4.0) D, max = (3.0-5.0) D.

In one embodiment, for two of the defocus lenses which are on the same concentric circle and are adjacent, the ratio of the linear distance between the centers of the balls in which the two defocus lenses are located to the diameter of the ball in which the defocus lenses are located is (0-2): (0-1).

In one embodiment, in the lens-worn state, the near zone is located directly below the geometric center of the lens body and is offset to one side of the wearer's nose.

In one embodiment, the optical power of the distance optical zone is a and the optical power of the near zone is a+add, where Add is one of +1.00D, +1.25D, +1.50D, +1.75D, and +2.00D.

In one embodiment, the curvature of the lens body surface at the position corresponding to the progressive zone is continuously changed, and the refractive power of the zone where the progressive zone is located is gradually changed from a near the far zone portion to a+add near the near zone portion.

In an embodiment, the front surface of the lens body is further divided into a peripheral aberration region, and the two peripheral aberration regions are respectively located at two sides of the region where the near zone and the gradient zone are located together.

In one embodiment, the peripheral aberration region adopts a free-form surface design, and the higher-order aberration of the peripheral aberration region has larger oblique coma and clover difference at a part close to the region where the near zone and the gradient zone are located together.

In one embodiment, the near zone is elliptical and the major axis of the ellipse is parallel to the horizontal line of sight direction of the lens when worn.

In a second aspect, the present utility model provides an eyeglass comprising the myopia control lens described above, which further has all technical effects.

The above-described features may be combined in various suitable ways or replaced by equivalent features as long as the object of the present utility model can be achieved.

Compared with the prior art, the myopia control lens and the glasses have the following beneficial effects:

according to the myopia control lens and the glasses, the optimized design is carried out on the far-vision defocusing structure, and the defocusing lens is adopted to form gradient peripheral defocusing, so that defocusing signals generated by the lens are more attached to radian of retina, and a better myopia control effect is achieved.

Drawings

The utility model will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 shows a schematic front view of a myopia control lens of the present utility model;

FIG. 2 shows a schematic view in cross section of a myopia control lens of the present utility model;

fig. 3 shows a partial schematic view of the defocus lens portion of the myopia control lens of the present utility model.

In the drawings, like parts are designated with like reference numerals. The figures are not to scale.

Reference numerals:

1-far zone, 11-far optical zone, 12-far defocus zone, 121-defocus lens, 2-gradation zone, 3-near zone, 4-peripheral aberration zone, 5-lens body, 51-front surface, 52-back surface.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

The embodiment of the utility model provides a myopia control lens, which comprises a lens body 5, wherein the front surface 51 of the lens body 5 is a progressive surface, the rear surface 52 is a progressive surface or a spherical surface, the front surface 51 is divided into a far zone 1, a near zone 3 and a gradual zone 2, and the gradual zone 2 is positioned between the far zone 1 and the near zone 3;

the far zone 1 comprises a far optical zone 11 and a far defocus zone 12 surrounding the far optical zone 11, wherein a plurality of defocus lenses 121 with convex cambered surfaces are distributed in the far defocus zone 12, and the plurality of defocus lenses 121 are distributed on a plurality of concentric circles taking the center of the far optical zone 11 as the center of a circle;

wherein, the refractive powers of the plurality of defocus lenses 121 on the same concentric circle are equal; the more the power of the defocus lenses 121 on the concentric circles on which the powers of the plurality of defocus lenses 121 on different concentric circles are equal or the more outside is larger.

Specifically, as shown in fig. 1 and fig. 2 of the drawings, the lens of the present utility model firstly performs area division on the lens, and sequentially divides a far zone, a gradual zone and a near zone on the front surface of the lens body along the vertical direction in the wearing state, so as to be used as different vision requirements. The utility model further designs the remote area, in particular to a defocusing structure of the remote area.

Specifically, the intermediate position of the far optical zone is further divided into a far optical zone, the far optical zone is in a circular shape with the diameter of 7-10mm, the refractive power in the range is determined by the refractive error of a wearer, and the far optical zone is used for correcting the refractive error of the far optical zone and realizing good vision of the far optical zone; the center of the vision distance optical zone is positioned at 8-10mm above the geometric center of the lens body. Then the residual area surrounding the far optical area is used as a far defocusing area, and a defocusing lens is arranged in the far defocusing area, so that a defocusing function is realized. The surface of the defocusing lens is in a convex cambered surface shape, is a convex lens capable of generating a certain refractive power, can be in a spherical structure or other cambered surface structures, and has a diameter of 0.5-2 mm as shown in figures 2 and 3 of the accompanying drawings. The plurality of defocus lenses are distributed on a plurality of concentric circles, and the present utility model is further designed for the refractive power of the defocus lenses, the refractive powers of the defocus lenses at different positions may be constant or gradually increasing in the radially outward direction of the concentric circle structure. In this embodiment, the refractive power of the defocus lens at different positions along the radial outward direction of the concentric circle structure is preferably gradually increased, so that gradient peripheral defocus can be formed, and the gradient peripheral defocus enables the defocus signal generated by the lens to be more fit to the radian of the retina, so that better myopia control effect is achieved. And the far-away defocus region can keep the near-sight defocus state of the retinal peripheral imaging during far vision, prevent compensatory increase of the ocular axis and finally control myopia.

In addition, the utility model is a multifocal myopia lens, when a wearer looks far, the far vision requirement can be met through the far vision zone of the lens, when the wearer looks near, the wearer can relax ciliary muscles, relieve adjustment cramps to reduce adjustment lag through the gradual change zone and the vision zone of the plus power, finally, the occurrence of far vision defocus of retina is avoided, and the myopia progress is controlled more effectively.

Preferably, the optical power of the distance optical zone 11 is a, the optical power of the defocus lens 121 on the innermost concentric circle is a+min, and the optical power of the defocus lens 121 on the outermost concentric circle is a+max, and satisfies: min= (2.0-4.0) D, max = (3.0-5.0) D.

In one embodiment, for two defocus lenses 121 that are on the same concentric circle and are adjacent, the ratio of the linear distance between the centers of the balls where the two defocus lenses 121 are located to the diameter of the ball where the defocus lenses 121 are located is (0-2): (0-1).

In one embodiment, in the lens-worn state, the near zone 3 is located directly below the geometric center of the lens body 5 and is offset to one side of the wearer's nose.

Specifically, in the lens shown in fig. 1 of the drawings, the near zone of the front surface of the lens is located to the right, and the near zone is located to the left when viewed by the wearer, and the lens corresponds to the right eye. The corresponding lens structure for the left eye is identical to that shown in fig. 1 of the drawings, except that the two are symmetrical to each other. The center of the near-use area is positioned 15-20mm below the geometric center of the lens body, the position of the near-use area is horizontally offset to the side where the nose is positioned by 2-4 mm, the offset design of the near-use area is more in accordance with the vision change rule of a wearer, and the use experience is improved.

Preferably, the near zone 3 is elliptical with the major axis of the ellipse parallel to the horizontal line of sight of the lens when worn, which more closely matches the usage habit of the wearer of sweeping left and right near line of sight.

In one embodiment, the optical power of the distance optical zone 11 is a (unit D), the near zone 3 is configured to provide near addition of a certain power, and the optical power of the near zone 3 is a+add, where Add is one of +1.00D, +1.25D, +1.50D, +1.75D, and +2.00D.

In one embodiment, the curvature of the surface of the lens body 5 at the position corresponding to the progressive zone 2 is continuously changed, and the refractive power of the zone where the progressive zone 2 is located is gradually changed from a near the distance zone 1 to a+add near the near zone 3.

Specifically, the progressive zone is located between the distance zone and the near zone, and the curvature of the surface thereof is continuously changed, thereby realizing continuous progressive change of the refractive power of the progressive zone between the distance zone and the near zone. If the power of the far zone is a (D), the near addition of the near zone is Add (D), then the power of the near zone is a+add (D), and the power of the graded zone is graded between a to a+add (D). The width of the gradual change region is 9-10 mm, and the length is 15-20mm.

In one embodiment, the front surface 51 of the lens body 5 is further divided into peripheral aberration regions 4, and the two peripheral aberration regions 4 are respectively located at two sides of the region where the near zone 3 and the progressive zone 2 are located together.

Preferably, the peripheral aberration region 4 adopts a freeform surface design, and the higher-order aberration of the peripheral aberration region 4 has larger oblique coma and clover difference at a portion close to the region where the near zone 3 and the gradation zone 2 are located together.

Specifically, the peripheral aberration region is formed by the original peripheral region of the lens body and is distributed below the far-use region and the two sides of the gradual change region. Because the original peripheral area of the lens body has higher high-order aberration, the vision effect in near vision is general, and the swimming phenomenon and the like are easy to occur. According to the utility model, the higher-order aberration of the peripheral aberration region is modulated by means of the free-form surface technology, the oblique coma and trefoil differences are increased in the region close to the gradual change region and the near-use region, and the astigmatism and the negative primary spherical aberration are reduced, so that the myopia control effect is further enhanced. The specific steps of the free-form surface technology for regulating and controlling the higher-order aberration are as follows:

1. wavefront aberration with a peripheral aberration region is obtained with a wavefront aberration sensor. Specifically, the wavefront aberration W of the peripheral aberration region is measured by a wavefront aberration sensor.

2. The wavefront aberration W is fitted and expanded using a Zernike polynomial to obtain a distribution of higher order aberrations. Specifically, the resulting wavefront aberration W is expanded using a Zernike polynomial. The Zernike polynomials can be associated with the Seidal aberrations of the optical system, with each term of the orthogonal basis functions representing a particular imaging aberration, each term having practical physical significance. Thus, aberrations affecting the imaging quality of the lens can be directly obtained by Zernike polynomial expansion.

The Zernike polynomials are typically defined in polar form and consist of a function of radial coordinates ρ and a function of angular coordinates θ. The functions are continuously orthogonal within a unit circle, and the expression is as follows:

wherein:

r (ρ) is a term related only to radial direction, Θ (θ) is a term related only to argument, n is the order of polynomial expansion; ρ is the radius of the circle, the value range is [0,1]; θ is the frequency of the sinusoidal component, and the value range is [0,2 pi ]; m is a frequency number; l is an angle-dependent parameter, and the parity of l and n is the same, where l=n-2 m when 0.ltoreq.m.ltoreq.n.

3. And optimizing the Zernike polynomial coefficients according to the set target, and obtaining the free-form surface design. Specifically, the reconstruction of the curvature and the corresponding cross-section curve of the curvature in the peripheral aberration region is realized to set the purposeMarked asAnd (5) optimizing a target curved surface. The curved surface optimization means that the curved surface rise and the curved surface normal direction in a certain area are kept unchanged, and the cross-section curvature in the orthogonal direction is optimized, so that the aberration generated by the new cross-section curvature is more approximate to or equal to the set target aberration distribution.

The embodiment of the utility model also provides the glasses, which comprise the myopia control lens and further have all technical effects.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," "right," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

Although the utility model herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present utility model. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present utility model as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.

Claims

1. The myopia control lens comprises a lens body and is characterized in that the front surface of the lens body is a progressive surface, the rear surface of the lens body is a progressive surface or a spherical surface, the front surface is divided into a far-use area, a near-use area and a gradual change area, and the gradual change area is positioned between the far-use area and the near-use area;

2. The myopia control lens according to claim 1, wherein the power of the distance optical zone is a, the power of the defocus lens on the innermost concentric circle is a+min, the power of the defocus lens on the outermost concentric circle is a+max, and the following are satisfied: min= (2.0-4.0) D, max = (3.0-5.0) D.

3. A myopia control lens according to claim 1 or 2, wherein for two of the defocus lenses located on the same concentric circle and adjacent to each other, the ratio of the linear distance between the centers of the spheres in which the two defocus lenses are located to the diameter of the sphere in which the defocus lenses are located is (0-2): 0-1.

4. A myopia control lens according to claim 1, wherein in the lens worn state the near zone is located directly below the geometric centre of the lens body and is offset to one side of the wearer's nose.

5. A myopia control lens according to claim 1 or 4, wherein the distance optical zone has a refractive power of a and the near zone has a +add, wherein Add is one of +1.00D, +1.25D, +1.50D, +1.75D and +2.00D.

6. A myopia control lens according to claim 5, wherein the curvature of the surface of the lens body at the location corresponding to the progressive zone varies continuously, the refractive power of the zone in which the progressive zone is located varying gradually from a near the distance zone portion to a+add near the near zone portion.

7. A myopia control lens according to claim 1, wherein the front surface of the lens body is further divided into peripheral aberration regions, the two peripheral aberration regions being located on opposite sides of the region in which the near zone and the progressive zone are located.

8. A myopia control lens according to claim 7, wherein the peripheral aberration region is of free form surface design, and the higher order aberrations of the peripheral aberration region have greater oblique coma and trefoil differences in the portions thereof adjacent to the region where the near zone and the progressive zone are common.

9. A myopia control lens according to claim 1, wherein the near zone is elliptical and the major axis of the ellipse is parallel to the horizontal line of sight of the lens when worn.

10. Spectacles comprising a myopia control lens according to any of claims 1 to 9.