A multifocal lens for treating farsightedness in teenagers

Abstract

This invention discloses a multifocal lens for treating hyperopia in adolescents, relating to the field of eyewear technology. The lens body has an outer surface designed as a spherical or aspherical surface, and an inner surface designed with a defocus structure. The central region is a stable optical zone, while the peripheral power varies according to a functional relationship. The image in the central region falls entirely on the retina, while the image in the peripheral region falls entirely behind the retina, inducing axial elongation and slowing the progression of hyperopia. This lens is suitable for all hyperopic individuals, with particularly good results for adolescents with hyperopia.

Description

Technical Field

[0001] This invention belongs to the field of eyeglasses technology, and in particular relates to a multifocal lens for treating farsightedness in adolescents. Background Technology

[0002] China's eyeglass lens market has experienced steady growth, with sales revenue growth slightly exceeding sales volume growth, and average product prices also rising continuously. Driven by rising per capita disposable income and increasing demand for vision protection, the domestic lens market has grown steadily. According to statistics, the retail sales of China's eyeglass lens market reached 31.4 billion yuan in 2021, a year-on-year increase of 11% (compared to 1% growth in 2019), with a compound annual growth rate of 4% over the past five years (2016-2021). The actual demand for lenses is related to two aspects: firstly, wearers are replacing resin lenses more frequently, and with rising living standards, many people are increasingly demanding multiple pairs of lenses. Secondly, the demand for functional lenses is also constantly increasing; in recent years, numerous patents and products have emerged to curb the development of myopia.

[0003] For example, Chinese patent literature discloses an electric alternating occlusion myopia control mirror [application number: CN201721036568.4], which features that the electric alternating occlusion myopia control mirror helps to relieve eye fatigue, thereby controlling the increase of myopia.

[0004] For example, Chinese patent literature discloses a student myopia control lens [application number: CN201820834348.4], in which the main lens is a concave lens and the secondary lens is a prism; the upper part of the main lens frame is provided with a connecting block having a through hole; the upper end of the secondary lens frame is provided with a connecting shaft that can be inserted into the through hole of the connecting block; the length of the connecting block is greater than the length of the connecting shaft; the nose pad base of the student myopia control lens has an elliptical hole-like structure in the middle; a flashing light and a switch are provided at the outer end of one temple; the size of the secondary lens is larger than the size of the main lens frame. The installation, removal, and use of the secondary lens are made more convenient through the cooperation between the through hole on the connecting block of the main lens and the connecting shaft on the secondary lens.

[0005] For example, Chinese patent literature discloses an asymmetric multi-point peripheral myopia defocus lens for myopia control in adolescents [Application No.: CN202121410062.1]. The front surface of the lens is spherical, and the rear surface is aspherical or super-toroidal. Its key feature is that the lens includes a central clear vision area and a peripheral myopia defocus area. The central clear vision area is located in the middle of the lens and is used to correct myopia. This central clear vision area is asymmetrically distributed in a slanted "T" shape around the geometric center of the lens. The peripheral myopia defocus area is located outside the central clear vision area. Extending the central clear vision area obliquely into a "T" shape can effectively reduce abrupt changes in the optical image within the fixation area when adolescents are reading at close range, and increasing wearing comfort by reducing astigmatism within the fixation area.

[0006] For example, Chinese patent literature discloses a myopia control glasses solution for posterior defocus [Application No.: CN202020291956.2]. This solution includes a frame with hinge pins on both sides of the upper part of the frame. A temple is located on one side of each hinge pin. Main lenses are located on both sides of the inner side of the frame. An auxiliary lens is located on the outer side of the main lenses on the frame. A rotating rod is connected to the upper part of the auxiliary lens, and one end of the rotating rod is connected to an adjustment mechanism located on the outer wall of the frame. This invention allows for adjustment of the position of the auxiliary lens through the adjustment mechanism. By cooperating with the main lenses, the auxiliary lens can correct central retinal defocus, improving distance vision. When viewing near objects, the auxiliary lens corrects peripheral hyperopic defocus, preventing the onset of myopia or controlling the increase in myopia.

[0007] For example, Chinese patent literature discloses a myopia control lens with peripheral defocus formed by aspherical surfaces [application number: CN201820009219.1]. The outer and inner surfaces of this lens are formed with a central optical zone that allows light to pass through and form a clear image on the central clear image area of ​​the retina of the eyeball. The central optical zone is surrounded by a peripheral optical zone that forms an image on the peripheral defocus image area around the central clear image area. The outer surface of the peripheral optical zone is aspherical so that the light passing through the peripheral optical zone can be imaged at the position of the peripheral defocus image area in front of the retina. At this time, in order to make distant objects image on the retina, the eye will relax the ciliary muscle and reduce accommodation, making the lens flat, so that the image of the peripheral optical zone can also fall on the retina. This avoids the ciliary muscle of the eyeball being in a state of tension and spasm for a long time, thus preventing the axial length of the eyeball from elongating, thereby effectively delaying or preventing the degree of myopia deviation from increasing.

[0008] A review of current literature reveals that myopic defocusing is widely used to address myopia control. However, hyperopia is also frequently observed in children. The quality of vision in hyperopic individuals is closely related to the degree of hyperopia. Mild hyperopia can be compensated for by accommodation without resulting in decreased vision. However, if hyperopia cannot be compensated for by accommodation, it becomes absolute hyperopia, often causing varying degrees of decreased vision. Corrected visual acuity in typical hyperopia: Visual impairment caused by hyperopia is quite common, especially with age, as accommodation gradually decreases, and latent hyperopia gradually transforms into manifest hyperopia. This not only leads to decreased distance vision but also makes near vision more susceptible to impairment. Therefore, controlling the progression of hyperopia is particularly important. Summary of the Invention

[0009] One objective of this invention is to address the aforementioned problems by providing a multifocal lens for treating farsightedness in adolescents.

[0010] To achieve the above objectives, the present invention employs the following technical solution: A full-focal lens for treating hyperopia in adolescents includes a lens body that is convex. The outer surface of the lens body is designed as a spherical or aspherical surface, and the inner surface of the lens body is designed with a defocus structure and has a central region and a peripheral region. The central region is a stable optical zone with consistent refractive power, so that the image of objects in the central region falls completely on the retina. The power of the peripheral region changes according to a functional relationship, so that the image of objects in the peripheral region falls completely behind the retina, inducing elongation of the eye axis and delaying the increase of hyperopia.

[0011] In the aforementioned allofocal lens for treating hyperopia in adolescents, the central region is formed at the center of the inner surface of the lens body and the area of ​​the central region ranges from 1 to 200 square millimeters.

[0012] In the aforementioned allofocal lens for treating hyperopia in adolescents, the area on the inner surface of the lens body excluding the central area is the peripheral area, and the area of ​​the peripheral area is 20-20000 square millimeters.

[0013] In the aforementioned allofocal lens for treating hyperopia in adolescents, the refractive power of the central region is consistent with the wearer's refractive power, and is used for the wearer's refractive correction.

[0014] In the aforementioned allofocal lens for treating hyperopia in adolescents, the power of the peripheral area varies in a gradient and ranges from -10.00D to +10.00D.

[0015] In the aforementioned allofocal lens for treating hyperopia in adolescents, the refractive power D of the peripheral region and the distance of that point from the geometric center of the lens satisfy formula (I):

[0016] D_periphery = D_center(1-log35X)-n*SinX(I)

[0017] Where D is the central diopter, n is a constant ranging from 0.01 to 10, and X is the distance between the peripheral region and the geometric center of the lens body, in millimeters.

[0018] In the aforementioned allofocal lens for treating hyperopia in adolescents, the change in diopter gradient in the peripheral region is linear or nonlinear.

[0019] In the aforementioned allofocal lens for treating hyperopia in adolescents, the outer surface of the lens body is spherical, and the radius of the spherical surface of the lens body is 300-500 mm.

[0020] In the aforementioned allofocal lens for treating hyperopia in adolescents, the gradient of the peripheral region of the inner surface of the lens body towards the direction away from the central region is 10-20 millimeters per millimeter radius.

[0021] Compared with existing technologies, the advantages of this invention are as follows: the outer surface adopts a spherical or aspherical design, and the inner surface adopts a defocus structure design. The central area is a stable light zone with consistent refractive power. This allows all light entering the eye through the pupil to be clearly imaged on the fovea, giving the wearer clear vision. The peripheral refractive power gradually changes in a tiered manner, and the peripheral vision image falls completely behind the retina. The peripheral light zone refractive power changes according to the gradient of human eye vision habits, increasing the stimulation of the peripheral light zone behind the retina. There are no blind spots, which induces axial elongation and slows down the increase of hyperopia. It is more effective for adolescent hyperopic patients. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0024] In the figure, the lens body is 1, the outer surface is 11, the inner surface is 12, the central area is 13, and the peripheral area is 14. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] like Figure 1-2As shown, this is a multifocal lens for treating hyperopia in adolescents, comprising a lens body 1 that is convex. The outer surface 11 of the lens body 1 is spherical with a radius R of 500 mm. The inner surface 12 of the lens body 1 has a defocus structure design. The inner surface 12 of the lens body 1 has a central region 13 and a peripheral region 14. The central region 13 is a circular region with a radius of 5 mm and a refractive power D of +3.00 at the center. The peripheral region 14 is a circular region with a radius of 35 mm. The refractive power (D) of the peripheral region decreases gradually, following the formula: Dperipheral = Dcenter(1-log35X) - n*SinX. When n=3, with a radius X of 6 mm, the refractive power increases to -1.51D; with a radius of 7 mm, -1.64D; with a radius of 8 mm, -1.75D; with a radius of 9 mm, -1.85D; and with a radius of 10 mm, -1.94D. This pattern continues. These data can be obtained using NIMO and a focimeter. The peripheral optical zone power changes according to the gradient of human visual habits, ensuring that the image falls completely on and behind the retina. This increases the stimulation of the retina by the peripheral optical zone, eliminating blind spots, inducing axial elongation, and slowing the progression of hyperopia. It is suitable for all myopic individuals, with particularly good results for teenagers.

[0028] Example 2

[0029] like Figure 1-2 As shown, this is a multifocal lens for treating hyperopia in adolescents, comprising a lens body 1 that is convex. The outer surface 11 of the lens body 1 is spherical with a radius R of 500 mm. The inner surface 12 of the lens body 1 has a defocus structure design. The inner surface 12 of the lens body 1 has a central region 13 and a peripheral region 14. The central region 13 is a circular region with a radius of 4 mm and a refractive power D of +5.00 at the center. The peripheral region is a circular region with a radius of 35 mm. The refractive power of the peripheral region decreases gradually, and the gradient changes according to the formula: D_periphery = D_center(1-log35X) - n*SinX. When n=3, the refractive power increases to -2.52D with a radius of 5 mm; -2.74D with a radius of 6 mm; -2.92D with a radius of 7 mm; -3.09D with a radius of 8 mm; -3.24D with a radius of 9 mm; and -3.37D with a radius of 10 mm.

[0030] Comparative example:

[0031] Taking a spherical lens as an example, if the diopter is +3.00, then the entire lens area is +3.00.

[0032] This comparative example is essentially the same as Example 1, with the same central refractive power. The difference lies in the peripheral refractive power (D) starting at +3.00. In areas beyond a 5mm radius, the lens exhibits significant added light. The lenses from Example 1 and the comparative example were tested using a focimeter. The results were as follows: at a test radius of 6mm, the refractive power increased to -1.51D; at 7mm, -1.64D; at 8mm, -1.75D; at 9mm, -1.85D; and at 10mm, -1.94D. The test results are consistent with the examples. Compared to the comparative example, the lens from Example 1 causes the peripheral image to focus in front of the retina, resulting in gradient defocus, better comfort, and an effect of elongating the axial length of the eye, which aligns with the human eye's visual habits.

[0033] This ensures that the image falls entirely on and behind the retina, increasing the stimulation of the retina by the peripheral light zone. With no blind spots, this induces elongation of the eye axis and slows the progression of farsightedness. It is suitable for all nearsighted individuals, with particularly good results for teenagers.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as lens body 1, outer surface 11, inner surface 12, central region 13, and peripheral region 14, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A multifocal lens for treating hyperopia in adolescents, comprising a lens body (1) that is a convex lens, characterized in that, The outer surface (11) of the lens body (1) is designed as a spherical or aspherical surface. The inner surface (12) of the lens body (1) is designed as a defocus structure and has a central region (13) and a peripheral region (14). The central region (13) is a stable light zone with consistent refractive power, so that the image of the central region (13) falls completely on the retina. The power of the peripheral region (14) changes according to a functional relationship, so that the image of the peripheral region (14) falls completely behind the retina. The degree of the surrounding area (14) varies with a gradient, and the gradient variation is linear or nonlinear. The degree range of the surrounding area (14) is -10.00D to +10.00D; The refractive power D of the surrounding area (14) 周边 The distance from this point to the geometric center of the lens satisfies formula (I): ， Among them, D 中心 The central diopter is n, which is a constant and ranges from 0.01 to 10. X is the geometric distance between the peripheral region (14) and the lens body (1) in millimeters. The central region (13) is formed at the center of the inner surface (12) of the lens body (1) and the area of ​​the central region (13) ranges from 1 to 200 square millimeters.

2. The allofocal lens for treating hyperopia in adolescents according to claim 1, characterized in that, The inner surface (12) of the lens body (1) excluding the central region (13) is the peripheral region (14), and the area of ​​the peripheral region (14) is 20-20000 square millimeters.

3. The allofocal lens for treating hyperopia in adolescents according to claim 1, characterized in that, The refractive power of the central region (13) is consistent with the wearer's refractive power and is used for wearer's refractive power correction.

4. The allofocal lens for treating hyperopia in adolescents according to claim 1, characterized in that, The outer surface (11) of the lens body (1) is spherical, and the radius of the spherical surface of the lens body (1) is 300-500 mm.

5. A multifocal lens for treating hyperopia in adolescents according to claim 1, characterized in that, The gradient of the peripheral region (14) of the inner surface (12) of the lens body (1) towards the direction away from the central region (13) is 10-20 mm per millimeter radius.

Images