CN217821144U - Lens and device for preventing and controlling myopia - Google Patents

Abstract

The utility model discloses a lens for preventing and controlling myopia, including the lens body, the lens body is at least including the first region that is located lens body downside, and the refractive power of first region is for just, and the first region through the lens body changes the out of focus volume that the light that comes from external below looked sideways at the omentum and produced at last to play the effect of preventing and controlling myopia. The utility model discloses a lens for preventing and controlling myopia can reduce the optics out of focus area and the optics out of focus volume of lens to can play better myopia prevention and control effect. The utility model also discloses a device for preventing and controlling myopia.

Description

Lens and device for preventing and controlling myopia

Technical Field

The utility model relates to an ophthalmology product field especially relates to a lens for preventing and controlling myopia. The utility model also relates to a device for preventing and controlling myopia.

Background

The myopia is not only concerned with the visual health of individuals and the highly popular myopia, but also seriously affects talent reserve of various industries in China. Therefore, myopia prevention and control is a problem that should be focused in the public health field in the future. Once a true myopia appears, correction can be performed only through frame glasses, corneal contact lenses or refractive surgery, but a series of changes caused by myopia in the eyeball cannot be really changed. Therefore, the key to controlling the prevalence of myopia is the prevention of myopia.

The optical defocus theory is an important theory in myopia prevention and control. At present, many lenses for controlling myopia based on the theory of optical defocus exist, and the basic structure mainly comprises two parts: a far-viewing zone and an optical out-of-focus zone. Both the distance vision zone and the optical defocus zone are based on prescription lenses. However, the design concept of the currently designed lens for the optical out-of-focus area is unclear and is not supported by theory, and the prevention and control effect on myopia becomes a prominent problem.

Therefore, how to reduce the additional optical defocus of the lens as much as possible without significantly affecting the myopia control effect of the lens is a problem to be considered and solved when designing the lens for myopia control.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lens for preventing and controlling myopia can reduce the optics out of focus area and the optics out of focus volume of lens to can play better myopia prevention and control effect.

In order to achieve the above object, the utility model provides a following technical scheme:

a lens for preventing and controlling myopia comprises a lens body, wherein the lens body at least comprises a first area, the first area is positioned on the lower side of the lens body, the refractive power of the first area is positive, so that the defocusing amount of a retina is generated on the upper side by changing light rays from the outside lower side.

Preferably, the lens body further comprises a second area which is connected with the first area, and the boundary line of the second area and the first area is an arc line which is convex towards the upper direction.

Preferably, at least one surface of the first region of the lens body is provided with a convex surface.

Preferably, at least one surface of the first area of the lens body is provided with a plurality of convex surfaces, so that the first area of the lens body forms a plurality of refractive units.

Preferably, the first region of the lens body comprises a base lens and a plurality of refractive elements disposed on a surface of the base lens, the refractive elements being such that the refractive power of the first region of the lens body is positive.

Preferably, the first zone of the lens body comprises a plurality of refractive elements distributed such that the refractive power of the first zone of the lens body is positive;

in the first area of the lens body, the number of refraction units below the optical center of the lens body is smaller than that of refraction units in other areas, or the distance between the refraction units below the optical center of the lens body is larger than that of the refraction units in other areas;

or in the first area of the lens body, the number of the refraction units positioned below the nose side is smaller than that of the refraction units positioned in other areas, or the distance between the refraction units positioned below the nose side is larger than that of the refraction units positioned in other areas.

Preferably, the first zone of the lens body comprises a plurality of refractive elements distributed such that the refractive power of the first zone of the lens body is positive, the magnitude of the refractive power of each refractive element of the first zone of the lens body increasing with increasing distance from the optical center of the lens body.

Preferably, the optical power values of the first region of the lens body at various positions are consistent, or the optical power values of the first region of the lens body at different positions are gradually changed.

Preferably, the first region of the lens body includes a first sub-region located on an upper side and a second sub-region located on a lower side, the refractive power values of the first sub-region at respective positions are gradually changed, and the refractive power values of the second sub-region at respective positions are uniform.

A device for preventing and controlling myopia comprises the lens for preventing and controlling myopia.

According to the above technical scheme, the utility model provides a lens for preventing and controlling myopia includes the lens body, and the lens body is at least including the first region that is located lens body downside, and the refractive power of first region is positive, and the first region through the lens body changes the out of focus volume that the omentum produced that looks sideways at the light that comes from external below to play the effect of preventing and controlling myopia. The utility model discloses a lens for preventing and controlling myopia can reduce the optics out of focus area and the optics out of focus volume of lens to can play better myopia prevention and control effect.

The utility model also provides a device for preventing and controlling myopia can reach above-mentioned beneficial effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a lens for preventing and controlling myopia according to an embodiment of the present invention;

fig. 2 is a schematic view of a lens for preventing and controlling myopia according to another embodiment of the present invention;

fig. 3 is a schematic view of a lens for preventing and controlling myopia according to another embodiment of the present invention;

fig. 4 is a schematic view of a lens for preventing and controlling myopia according to another embodiment of the present invention;

fig. 5 is a schematic view of a lens for preventing and controlling myopia according to another embodiment of the present invention;

fig. 6 is a schematic view of a lens for preventing and controlling myopia according to another embodiment of the present invention.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

The embodiment provides a lens for preventing and controlling myopia, which comprises a lens body, wherein the lens body at least comprises a first area, the first area is positioned on the lower side of the lens body, and the refractive power of the first area is positive so as to change the defocusing amount generated by the retina at the upper side by light rays from the outside lower part.

The refractive power refers to the fact that parallel light passes through an optical system, the propagation direction of the light can be deflected, and the refractive power is used for representing the deflection capability of the optical system to incident parallel light. The optical system has a positive refractive power, indicating that the light is focused.

The lens of this embodiment, the refractive power of the first region of lens body is positive for to the light that comes from external below produces the bias of convergence, thereby changes the out of focus volume that the retina produced at last side view of the light that comes from external below, plays the near-sightedeffect of prevention and control through this realization to user's eyes.

The design concept of the lens for preventing and controlling myopia is explained below. The applicant found, based on a clinical observational study, that:

(1) the children with large amount of myopic optical defocus generated by the upper retina have faster myopia progression speed. The researchers analyzed that this should be due to the fact that in the visual environment of human eyes, optical signals from the ground direction will produce hyperopic defocus at the upper retina of the eye, while optical signals from the sky direction will produce relatively myopic defocus at the lower retina of the eye, while optical defocus is locally reactive on the retina, i.e. where defocus is high, where retina changes correspondingly fast. After the upper retina is stimulated by more hyperopic defocus, a local elongation of the eye occurs, and the elongated local eye exhibits a change from the hyperopic defocus on the retinal diopter topography of the eye.

(2) For emmetropic children, the change in retinal defocus occurs primarily on the upper and lower sides of the retina, and myopic defocus occurs first at the upper retina, then progresses towards the lower retina, and eventually causes myopia to occur.

(3) For the nasal and temporal retinas, there is no significant correlation between the amount of optical defocus and the occurrence of myopia.

Aiming at the discovery, researchers provide the design concept of optical defocus for preventing and controlling myopia:

(1) before the myopia occurs, the upper part of the eyeball is firstly lengthened and finally causes myopia, so that the optical out-of-focus additional area of the myopia prevention and control lens is aimed at the upper retina. The upper part of the eyeball is controlled not to be prolonged, and the development to the central retina and the lower retina can be avoided.

(2) For children with different myopia development speeds, the distribution of optical defocus on the retina on the nasal and temporal sides is not significantly different, so it can be presumed that optical defocus at the horizontal periphery of the central retina is not a main area affecting myopia.

Referring to fig. 1 in combination, fig. 1 is a schematic view of a lens for preventing and controlling myopia according to an embodiment, according to the above analysis result, in the lens provided in this embodiment, a lens body 100 includes a first region 101 located at a lower side, and a refractive power of the first region 101 is positive, so that a convergent deflection is generated on light rays from an external lower side through the first region 101 of the lens to counteract a hyperopic defocus generated on an upper side retina by the light rays from the external lower side, thereby reducing a local elongation of an eyeball, and playing a role in preventing and controlling myopia.

Preferably, the lens body further comprises a second area which is connected with the first area, and the boundary line of the second area and the first area is an arc line which is convex towards the upper direction. Referring to fig. 1, the second area 102 is connected to the first area 101, and normal vision can be provided to the eyeball through the second area 102 of the lens.

Based on the findings in the study that the amount of optical defocus for the nasal and temporal retinas did not significantly correlate with the onset of myopia, researchers speculate that optical defocus at the horizontal periphery of the central retina was not the primary area affecting the onset of myopia. Therefore, in the lens of the present embodiment, the boundary line between the second area 102 and the first area 101 is designed to be an upward convex arc, so as to appropriately reduce the area of the out-of-focus area corresponding to the horizontal peripheral position of the central retina on the lens, and thus the normal visual field range of the lens can be improved, so as to balance the visual problem and the myopia control effect, and obtain better lens wearing compliance.

The optical power of the second region 102 of the lens body 100 may be set to 0D. The boundary line between the second region 102 and the first region 101 may be, but is not limited to, an upwardly convex circular arc, a parabola or an elliptical circular arc.

Optionally, at least one surface of the first area 101 of the lens body 100 is provided with a convex surface, so that the refractive power of the first area 101 of the lens body is positive. One side surface of the first area 101 of the lens body can be designed to have a convex surface, and the other side surface is designed to be a plane; or both side surfaces of the first region 101 of the lens body may be designed to have convex surfaces.

Alternatively, at least one surface of the first region 101 of the lens body may be provided with a convex surface, i.e. the first region 101 of the lens body integrally forms a convex lens.

Optionally, at least one surface of the first area 101 of the lens body may be provided with a plurality of convex surfaces, so that the first area 101 of the lens body forms a plurality of refraction units, each refraction unit refracts light from the outside, so that the light enters the eyeball after passing through the refraction unit, and the refractive power of the refraction unit is positive.

A plurality of convex surfaces may be distributed on one side surface of the first area 101 of the lens body, and the other side surface of the first area 101 is a plane or a convex surface, that is, the first area 101 of the lens body forms a plurality of convex lenses distributed thereon. Referring to fig. 2, fig. 2 is a schematic diagram of a lens for preventing and controlling myopia according to another embodiment, as shown in the figure, a plurality of refractive units 103 are distributed in a first area 101 of a lens body 100, and the refractive power of each refractive unit 103 is positive.

The convex surface provided in the first region 101 of the lens body may be spherical or aspherical.

Optionally, the first zone 101 of the lens body comprises a base lens and a plurality of refractive elements disposed on the surface of the base lens, the refractive elements being such that the refractive power of the first zone of the lens body is positive. Each refraction unit refracts light from the outside, so that the light enters the eyeball after passing through the refraction unit. The surface profile of the refractive unit may be spherical or aspherical. The base lens may be a lens having no deflecting ability with respect to the incident light, that is, the base lens has a refractive power of 0D.

Alternatively, for embodiments in which the first region 101 of the lens body comprises a plurality of refractive elements 103 distributed such that the refractive power of the first region 101 of the lens body is positive, the refractive power values of the individual refractive elements 103 of the first region 101 may be the same. Alternatively, the refractive power values of the refractive units 103 may be different, and the refractive power values of the refractive units 103 may be gradually changed, or the refractive power values of a plurality of refractive units 103 may be the same, and the refractive power values of another plurality of refractive units 103 may be the same. The power magnitude is used to characterize the power magnitude of the optical system.

Alternatively, it may be provided that the magnitude of the refractive power of each refractive element 103 of the first region 101 of the lens body increases with increasing distance from the optical center of the lens body 100. That is, in the first region 101 of the lens body, the farther the refractive unit 103 is from the optical center of the lens body 100, the larger the magnitude of the refractive power of the refractive unit 103. The design is adopted to provide a wide-range clear visual field for objects from far to near, and when object light is projected on the retina, light rays at all points of the retina can be focused as much as possible.

Alternatively, for an embodiment in which the first region 101 of the lens body comprises a plurality of refractive units 103 distributed, and the refractive units 103 are such that the refractive power of the first region 101 of the lens body is positive, the respective refractive units 103 of the first region 101 may have the same pitch, i.e. the respective refractive units 103 are distributed uniformly. Alternatively, the pitch of each refractive element 103 may be different, and the pitch of each refractive element 103 may be changed according to a certain rule.

Preferably, in the first region 101 of the lens body 100, the number of refractive units located below the optical center of the lens body 100 is smaller than the number of refractive units located in other regions, or the refractive unit pitch located below the optical center of the lens body 100 is larger than the refractive unit pitch located in other regions. Referring to fig. 3, fig. 3 is a schematic view of a lens for preventing and controlling myopia according to another embodiment, in which the number of refractive units 103 located below the optical center of the lens body 100 is decreased or the distance between the refractive units 103 located below the optical center of the lens body 100 is increased in the first region 101 of the lens body 100.

Alternatively, the number of refractive elements located under the nose side may be smaller than the number of refractive elements located in other regions, or the refractive element pitch located under the nose side may be larger than the refractive element pitch located in other regions, in the first region 101 of the lens body 100. Referring to fig. 4, fig. 4 is a schematic view of a lens for preventing and controlling myopia according to another embodiment, in a first area 101 of a lens body 100, the number of refraction units 103 located under the nose side is reduced or the distance between the refraction units 103 located under the nose side is increased, so that the refraction units 103 corresponding to the area under the nose side in the first area 101 are sparser.

When the human eye works in a near distance, the eyeball rotates downwards, or rotates inwards, that is, rotates towards the nose side, at this time, the sight line of the human eye passes through the first area 101 of the lens, and the lens of the embodiment reduces the number of the refraction units 103 below the optical center of the lens in the first area 101 of the lens or increases the distance between the refraction units 103, or reduces the number of the refraction units 103 below the nose side in the first area 101 of the lens or increases the distance between the refraction units 103, so as to reduce the influence on the vision of the human eye.

Alternatively, the optical power values of the first region 101 of the lens body 100 may be set to be uniform at various positions. The surface of the first area 101 of the lens body may be entirely provided as one convex surface so that the first area 101 has the same power magnitude at each position. Alternatively, a plurality of refraction units may be distributed in the first area 101 of the lens body, each refraction unit refracts light from the outside, so that the light enters the eyeball after passing through the refraction unit, and the refractive power values of the refraction units are the same.

Alternatively, the lens body 100 may be provided with different values of the optical power at respective positions of the first region 101. The surface profile of the first region 101 of the lens body can be designed to include a convex surface or a concave surface so that the optical power values at various positions of the first region 101 are different. Alternatively, a plurality of independent refraction units may be distributed in the first area 101 of the lens body, each refraction unit refracts light from the outside, so that the light enters the eyeball after passing through the refraction unit, and the refractive power values of the refraction units are different.

Preferably, a power value progression can be provided at different positions of the first area 101 of the lens body 100. The power value of each position of the first area 101 of the lens body gradually increases as the distance from the optical center of the lens body 100 increases, that is, the power value at the corresponding position is larger as the distance from the optical center of the lens body 100 is larger in the first area 101 of the lens body 100.

Further preferably, the first area 101 of the lens body 100 includes a first sub-area located on the upper side and a second sub-area located on the lower side, the refractive power values of the first sub-area at the respective positions are gradually changed, and the refractive power values of the second sub-area at the respective positions are uniform. Referring to fig. 5, fig. 5 is a schematic view of a lens for preventing and controlling myopia according to another embodiment, in which the first area 101 includes a first sub-area 104 and a second sub-area 105, the power value of each position of the first sub-area 104 is gradually changed, and the power value of each position of the second sub-area 105 is consistent. The design is adopted to provide a wide-range clear visual field for objects from far to near, and when object light is projected on the retina, light rays at all points of the retina can be focused as much as possible.

Optionally, the first sub-area 104 may comprise a plurality of refractive units distributed such that the refractive power of the first sub-area 104 of the lens body 100 is positive. Referring to fig. 6, fig. 6 is a schematic diagram of a lens for preventing and controlling myopia according to another embodiment, in which the first sub-area 104 includes a plurality of distributed refractive units 103, and the power value of each refractive unit 103 may be gradually changed. Preferably, it can be provided that the magnitude of the optical power of each refractive unit 103 of the first sub-area 104 of the lens body increases with increasing distance from the optical center of the lens body 100. That is, within the first sub-area 104 of the lens body, the farther the refractive unit 103 is from the optical center of the lens body 100, the larger the magnitude of the refractive power of the refractive unit 103.

The surface of the second subregion 105 of the lens body 100 can be provided as a convex surface as a whole, so that each position of the second subregion 105 has the same power value. Or the surface shape of the second sub-area 105 of the lens body 100 may also adopt other designs.

Based on the findings in the research, for emmetropic children 9-16 years old, the distance of the common near-distance eye is 20cm, and the vergence of the corresponding light rays is +5D, therefore, in order to counteract the hyperopic defocus of the retina generated by the near-distance eye as much as possible, the refractive power of the first lens region 101 of the embodiment should be not less than +5D, and the minimum refractive power value of the first lens region 101 can be set to be not less than +5D.

Optionally, the lens body 100 can include a central zone within which the optical center of the lens body 100 is located. As can be seen with reference to fig. 2-6, the first region 101 is located on the underside of the central region 106. The central region 106 may be circular or oval or other shapes. The optical power of the central zone 106 may be 0D.

Optionally, an aberration region may be disposed in a nasal region or a temporal region of the lens body 100, and the aberration region is used for reducing aberration generated when light from the outside passes through the lens body 100 and enters the eye. Referring to fig. 5, an aberration area 107 is provided in a nasal area or a temporal area of the lens body 100. For lenses, aberrations are caused by too fast transition change of local curvature radius, the closer the lens is to the peripheral parts of the nasal side and the temporal side, the larger the sagittal height difference caused by the parts with different curvature radii on the lens is, a uniform image cannot be formed on the retina, a blurred image is formed, namely, imaging deformity is generated, and the human eyes cannot see objects clearly when passing through the area. This problem is avoided by providing an aberration area in the nasal or temporal area of the lens body 100. The aberration zone of the lens body 100 can be concave.

The embodiment also provides a device for preventing and controlling myopia, which comprises the lens for preventing and controlling myopia.

The device for preventing and controlling myopia of this embodiment, the lens of adoption includes the lens body, the lens body is at least including the first region that is located lens body downside, the refractive power of first region is for just, the first region through the lens body changes the out of focus volume that the light that comes from external below produced at last looks sideways at the omentum, thereby play the effect that prevention and control is near-sighted, use this a device for preventing and control is near-sighted can reduce the optics out of focus area and the optics out of focus volume of lens, and can play better near-sighted prevention and control effect.

The device for preventing and controlling myopia of the present embodiment may be frame glasses.

The above details are provided for the lens and the device for preventing and controlling myopia provided by the utility model. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (8)

1. A lens for preventing and controlling myopia, which is characterized by comprising a lens body, wherein the lens body at least comprises a first area, the first area is positioned at the lower side of the lens body, the refractive power of the first area is positive so as to change the defocus amount generated by light rays from the outside lower side on the retina from the upper side, the refractive power values of all positions of the first area of the lens body are consistent, or the refractive power values of different positions of the first area of the lens body are different;

at least one surface of the first area of the lens body is provided with a plurality of convexities so that the first area of the lens body forms a plurality of refractive units, or the first area of the lens body comprises a base lens and a plurality of refractive units, the refractive units are arranged on the surface of the base lens, and the refractive units make the refractive power of the first area of the lens body positive.

2. A lens for prevention and control of myopia according to claim 1, wherein the lens body further comprises a second zone connected to the first zone and having a boundary line which is an upwardly convex arc.

3. A lens for the prevention and treatment of myopia according to claim 1, wherein at least a surface of the first zone of the lens body is provided with a convex surface.

4. A lens for prevention and control of myopia according to claim 1, wherein the first region of the lens body comprises a distributed plurality of refractive elements that cause the refractive power of the first region of the lens body to be positive;

in the first region of the lens body, the number of refractive units below the optical center of the lens body is less than the number of refractive units in other regions, or the refractive unit pitch below the optical center of the lens body is greater than the refractive unit pitch in other regions;

or in the first area of the lens body, the number of the refraction units positioned below the nose side is smaller than that of the refraction units positioned in other areas, or the distance between the refraction units positioned below the nose side is larger than that of the refraction units positioned in other areas.

5. A lens for prevention and control of myopia according to claim 1, wherein the first region of the lens body comprises a plurality of refractive elements distributed such that the refractive power of the first region of the lens body is positive, the magnitude of the refractive power of each refractive element of the first region of the lens body increasing with distance from the optical centre of the lens body.

6. A lens for the prevention and treatment of myopia according to any of claims 1 to 5, wherein the optical power values at each location of the first region of the lens body are uniform or the optical power values at different locations of the first region of the lens body are graduated.

7. A lens for prevention and control of myopia according to any of claims 1 to 5, wherein the first area of the lens body comprises a first sub area on an upper side and a second sub area on a lower side, the power magnitude at each position of the first sub area is gradual and the power magnitude at each position of the second sub area is uniform.

8. A device for the prevention and control of myopia comprising a lens for the prevention and control of myopia according to any one of claims 1 to 7.

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