CN210514837U

CN210514837U - Multi-focus lens

Info

Publication number: CN210514837U
Application number: CN201921239716.1U
Authority: CN
Inventors: 汪山献松; 陈国贵; 张孝; 侯大林; 李品秧
Original assignee: Shanghai Weixing Optical Co ltd
Current assignee: Shanghai Weixing Optical Co ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-05-12
Anticipated expiration: 2029-08-02

Abstract

The utility model relates to a multifocal lens, lens surface type adopt the design of the oval region of three-layer, first regional diopter, and it has the diopter based on the prescription of correcting vision ametropia usefulness. The second region is discontinuously distributed with a plurality of mutually independent convex domes. The third region is discontinuous and is also provided with a plurality of mutually independent convex domes. The central optical area of the utility model is the first oval area, which provides clear central vision for the wearer, ensures the normal vision requirement of the patient when looking far, adopts the factors of bionic and visual central vision, and the central area adopts oval design, which can ensure the clear visual field of the central area of the wearer; in the second area and the third area, a discontinuous light adding strategy is adopted to eliminate near vision defocusing around the eyeball of a myopia patient, and the irritation factor of myopia deepening is reduced, so that the deepening of the myopia of teenagers is effectively delayed.

Description

Multi-focus lens

Technical Field

The utility model relates to a lens technical field, specific multifocal lens that says so.

Background

After 4 years of release of the first national vision health report in 2015, the state highly attaches importance to prevention and control of myopia of children and teenagers at present, but the situation of high myopia of children and teenagers is not changed greatly. The report states that: in the general population of China over 5 years old in 2012, the number of patients with various kinds of distant vision defects is about 5 hundred million, and the total number of patients with myopia is about 4.5 hundred million. It can be said that almost one out of every 3 people in china suffers from myopia. Without effective policy intervention, the prevalence rate of myopia of people over 5 years old in China will increase to about 51% by 2020, and the prevalence rate of the population reaches 7 hundred million. In 8 months in 2018, 8 departments such as the education department, the national health committee and the like jointly issue a comprehensive prevention and control implementation scheme for the myopia of children and teenagers, and provide a target that the myopia rate of the children at 6 years old in China is controlled to be about 3% by 2030. Myopia prevention and treatment becomes a topic of concern for the whole world. However, the proportion of myopia among teenagers and children in our country is still high. According to the news release held by the national health and construction Commission in 2019 in 4 months, the myopia survey results of children and teenagers in 2018 in China show that the total myopia rate of the children and the teenagers is 53.6%, the myopia rate of primary schools is increased from 15.7% of the first grade to 59.0% of the sixth grade, and the number of people with high myopia (the myopia degree is over 600 degrees) in the third grade accounts for 21.9% of the total myopia.

The current effective myopia correction methods such as frame glasses, corneal contact lenses and excimer laser corneal refractive surgery can effectively achieve the purpose of refractive correction. The research and exploration on the treatment of the myopia are still in progress, and the research progress of various myopia occurrence and development mechanisms, such as the regulation theory, the defocusing theory and the research on the eyeball molecular biological level, provides a new idea for the treatment and prevention of the myopia. However, the occurrence and development of myopia are influenced by many factors, so that the progress and effect of myopia prevention and treatment are not particularly simplified and optimistic. Although clinical studies have been conducted for many years for various methods for preventing and treating myopia, such as near reading addition (including progressive multifocal lenses), RGP (red fluorescent protein) testing, corneal remodelling lenses, drug therapy and the like, the methods cannot be popularized and applied at present due to inconsistent results, small samples, side effect problems and the like.

Patent retrieval finds that the functional lens has the function of controlling the development of myopia, and foreign patents include: in the lens described in japanese patent No. 4891249, the lens described in the patent document is a fresnel multifocal lens in which a plurality of refractive regions are concentrically arranged in the lens, wherein at least one of the refractive regions, which is a first refractive region, has a first refractive power based on a prescription for correcting ametropia of an eye. Also, refractive regions other than the first refractive region have at least one refractive power different from the first refractive power, respectively. The wearer uses the lens to view an object, forming an image of the object on the retina, while forming an image at a point in front of the retina, can theoretically control the progression of myopia. However, in actual wearing, ghost images are formed, which makes it difficult for the wearer to comfortably use the glasses, so that the use of the series of glasses is limited.

The domestic latest patent CN104678572B, the lens described in the patent literature is a first refractive area having a first refractive power based on a prescription for correcting the ametropia of the eye; and a second dioptric region having a refractive power different from the first refractive power and having a function of focusing an image on a position other than a retina of the eye to suppress development of ametropia of the eye. However, in the actual wearing process, due to the overall design of the two regions, the distinction degree between the first region and the second region is obvious, which causes many wearers to feel uncomfortable. To address this problem, the patent employs a three-zone design. The major axis of the ellipse of the first layer area is 10.0mm, and the minor axis is 8.0 mm. The major axis of the ellipse of the second layer area is 30.0mm, the minor axis is 20.0mm, and the first area is not included; the lens, in addition to the first and second zones, is collectively referred to as a third zone. A first zone diopter having a diopter power based on a prescription for correcting vision refractive error. The second area is uniformly distributed with a plurality of independent convex domes, the second area has non-continuity of diopter, the plane diopter is consistent with the first area, and the convex dome diopter has +1.00- +4.00D of addition compared with the plane diopter. The third area is uniformly distributed with a plurality of independent convex domes, the diopter of the third area is discontinuous, the plane diopter is consistent with that of the first area, and the diopter of the convex domes has +2.00- +5.00D of addition compared with the plane diopter. The central optical area of the utility model is the first oval area, which provides clear central vision for the wearer, ensures the normal vision requirement of the patient when looking far, adopts the factors of bionic and visual central vision, and the central area adopts oval design, which can ensure the clear visual field of the central area of the wearer; in the second area and the third area, the non-continuous light adding strategy is adopted to eliminate the peripheral myopic defocusing of the eyeball of the myopic patient and reduce the irritative factors of myopic deepening, thereby effectively delaying the deepening of the myopia of teenagers, and meanwhile, due to the design of the three areas, the comfort of a wearer is obviously improved. The raw material of the lens is polyurethane, and the refractive index and the Abbe number of the lens meet the following conditions: the refractive index is 1.67 plus the Abbe number is more than or equal to 30, or the refractive index is 1.60 plus the Abbe number is more than or equal to 40, or the refractive index is 1.53 plus the Abbe number is more than or equal to 58; the document has not been reported yet. The designed lens can effectively control and relieve the deepening of the myopia of teenagers in the actual use process.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a multifocal lens.

The purpose of the utility model is realized through the following technical scheme:

a multifocal lens, characterized in that the surface shape of the lens adopts a three-layer elliptical area design, the major axis of the ellipse of the first layer area is 10.0mm, the minor axis is 8mm, the major axis of the ellipse of the second layer area is 30.0mm, the minor axis is 20.0mm, and the lens does not include the first area; the lens, with the exception of the first and second zones, is collectively referred to as a third zone; the third area is also discontinuously distributed with a plurality of independent convex domes; the polyurethane lens is circular and has a diameter of 50 mm to 100 mm.

A first zone diopter having a diopter power based on a prescription for correcting vision refractive error. The second area is discontinuously distributed with a plurality of independent convex domes, the second area has discontinuous diopter, the plane diopter is consistent with the first area, and the convex dome diopter has +1.00- +4.00D of addition compared with the plane diopter. The third area is also discontinuously distributed with a plurality of independent convex domes, the diopter of the third area is discontinuous, the plane diopter is consistent with that of the first area, and the diopter of the convex domes has +2.00- +5.00D of addition compared with the plane diopter. The diameter of each convex tip circle is 0.1mm to 2.0mm, and the height is 0.5um to 5.0 um. The distribution of the plurality of mutually independent convex domes is discontinuous, and the distance between two adjacent convex domes is 0.1mm to 3 mm. In the second area and the third area of the lens, a discontinuous light adding strategy is adopted to eliminate near vision defocusing around the eyeball of a myope, and the irritation factor of myopia deepening is reduced, so that the myopia deepening of teenagers is effectively delayed. The first zone has a refractive power based on a prescription for correcting vision refractive error. The central area of the first area of the lens adopts an oval design, so that the clear vision of the central area of a wearer can be ensured. At the same time, the comfort of the wearer is significantly increased due to the three-zone design. The raw material of the lens is polyurethane, and the refractive index and the Abbe number of the lens meet the following conditions: the refractive index is 1.67 plus the Abbe number is more than or equal to 30, or the refractive index is 1.60 plus the Abbe number is more than or equal to 40, or the refractive index is 1.53 plus the Abbe number is more than or equal to 58.

As a preferred scheme, for teenagers with different myopia diopters, polyurethane resin lenses with different refractive indexes and abbe numbers can be selected, and for teenagers with myopia degrees of more than-3.00D, the resin lenses made of polyurethane materials with the refractive index of 1.53 plus the abbe number of more than or equal to 58 are recommended; for teenagers with myopia degrees between-3.00D and-6.00D, the resin lens made of polyurethane materials with the refractive index of 1.60+ Abbe number more than or equal to 40 is recommended; for teenagers with myopia degrees of less than or equal to-6.00D, the resin lens made of polyurethane material with the refractive index of 1.67 plus the Abbe number of more than or equal to 30 is recommended. Preferably, the surface shape of the lens adopts a three-layer elliptical area design, wherein the major axis of an ellipse of the first layer area is 10.0mm, and the minor axis of the ellipse is 8 mm. The major axis of the ellipse of the second layer area is 30.0mm, the minor axis is 20.0mm, and the first area is not included; the lens, in addition to the first and second zones, is collectively referred to as a third zone. A first zone diopter having a diopter power based on a prescription for correcting vision refractive error. The second zone is non-continuous with a plurality of independent convex domes, the second zone has non-continuity of diopter, the plane diopter is consistent with the first zone, and the convex dome diopter has +1.50D of addition compared with the plane diopter. The third area is also discontinuously distributed with a plurality of independent convex domes, the diopter of the third area is discontinuous, the plane diopter is consistent with that of the first area, and the refractive power of the convex domes is +3.00D of addition light compared with that of the plane diopter. The diameter of each convex top circle of the second area is 1mm, and the height is 0.4 um. The diameter of each protruding top circle in the third area is 0.5mm, and the height is 0.4 um. The distribution of the plurality of mutually independent convex domes is discontinuous, and the distance between two adjacent convex domes of the second area is 0.5 mm; the distance between two adjacent convex domes in the third area is 0.25 mm;

compared with the prior art, the utility model has the positive effects that:

the first zone has a refractive power based on a prescription for correcting vision refractive error. The central area of the first area of the lens adopts an oval design, so that the clear vision of the central area of a wearer can be ensured. Adopt protruding calotte to add light, reduced myopic defocus, alleviateed the irritability factor of myopia deepening to delay teenagers ' myopia's deepening, adopted simultaneously because three regional designs, the second region can carry out incremental type discontinuity with the third region and add light and can let the obvious increase of wearer's travelling comfort.

Drawings

Fig. 1 is a schematic view of a multifocal lens.

Detailed Description

The following provides a specific embodiment of a multifocal lens of the present invention.

Example 1

Referring to FIG. 1, a lens having a refractive index of 1.53, Abbe number of 58 and a lens power of-2.00D was produced. Injecting raw materials with the refractive index of 1.56 into a mold, curing, and then obtaining the required semi-finished blank lens through the processes of demolding, edging, cleaning, hardening, film adding, inspecting and the like. A multifocal lens was processed in a vehicle room facility, and the actual power was checked to be-1.98D: the surface shape of the lens adopts a three-layer elliptical area design, the major axis of an ellipse of the first layer area is 10.0mm, and the minor axis is 8.0 mm. The major axis of the ellipse of the second layer area is 30.0mm, the minor axis is 20.0mm, and the first area is not included; the lens, in addition to the first and second zones, is collectively referred to as a third zone. A first zone diopter having a diopter power based on a prescription for correcting vision refractive error. The second zone is non-continuous with a plurality of independent convex domes, the second zone has non-continuity of diopter, the plane diopter is consistent with the first zone, and the convex dome diopter has +1.50D of addition compared with the plane diopter. The third area is also discontinuously distributed with a plurality of independent convex domes, the diopter of the third area is discontinuous, the plane diopter is consistent with that of the first area, and the refractive power of the convex domes is +3.00D of addition light compared with that of the plane diopter. The diameter of each convex top circle of the second area is 1mm, and the height is 0.4 um. The diameter of each protruding top circle in the third area is 0.5mm, and the height is 0.4 um. The distribution of the plurality of mutually independent convex domes is discontinuous, and the distance between two adjacent convex domes of the second area is 0.5 mm; the distance between two adjacent convex domes of the third area is 0.25 mm.

Example 2

Referring to FIG. 1, a lens having a refractive index of 1.67, Abbe number of 30 and a lens power of-4.00D was produced. Injecting raw materials with the refractive index of 1.67 into a mold, curing, and then obtaining the required semi-finished blank lens through the processes of demolding, edging, cleaning, hardening, film adding, inspecting and the like. A multifocal lens was processed in a vehicle room facility, and the actual power was checked to be-4.03D: the surface shape of the lens adopts a three-layer elliptical area design, the major axis of an ellipse of the first layer area is 10.0mm, and the minor axis is 8.0 mm. The major axis of the ellipse of the second layer area is 30.0mm, the minor axis is 20.0mm, and the first area is not included; the lens, in addition to the first and second zones, is collectively referred to as a third zone. A first zone diopter having a diopter power based on a prescription for correcting vision refractive error. The second area is discontinuously distributed with a plurality of independent convex domes, the second area has discontinuous diopter, the plane diopter is consistent with the first area, and the convex dome diopter has +2.00D of addition light compared with the plane diopter. The third zone is also discontinuously distributed with a plurality of independent convex domes, the third zone has discontinuous diopter, the plane diopter is consistent with the first zone, and the convex dome diopter has +4.00D of addition compared with the plane diopter. The diameter of each convex top circle of the second area is 1mm, and the height is 0.5 um. The diameter of each protruding top circle in the third area is 0.5mm, and the height is 0.5 um. The distribution of the plurality of mutually independent convex domes is discontinuous, and the distance between two adjacent convex domes of the second area is 0.4 mm; the distance between two adjacent convex domes of the third area is 0.3 mm.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as within the protection scope of the present invention.

Claims

1. A multifocal lens is characterized in that the surface shape of the lens adopts a three-layer oval area design, the major axis of an oval in a first layer area is 10.0mm, the minor axis of the oval in the first layer area is 8mm, the major axis of an oval in a second layer area is 30.0mm, and the minor axis of the oval in the second layer area is 20.0 mm; the lens, with the exception of the first and second zones, is collectively referred to as a third zone; the third area is also discontinuously distributed with a plurality of independent convex domes; the polyurethane lens is circular and has a diameter of 50 mm to 100 mm.

2. A multifocal lens according to claim 1, characterized in that each convex tip circle has a diameter of 0.1mm to 2.0mm and a height of 0.5 μm to 5.0 μm.