CN114609799B - Defocused spectacle lens and preparation mold thereof - Google Patents
Defocused spectacle lens and preparation mold thereof Download PDFInfo
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- CN114609799B CN114609799B CN202210236744.8A CN202210236744A CN114609799B CN 114609799 B CN114609799 B CN 114609799B CN 202210236744 A CN202210236744 A CN 202210236744A CN 114609799 B CN114609799 B CN 114609799B
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- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000013461 design Methods 0.000 claims abstract description 74
- 208000001491 myopia Diseases 0.000 claims abstract description 61
- 238000012937 correction Methods 0.000 claims abstract description 45
- 230000004438 eyesight Effects 0.000 claims abstract description 36
- 150000001875 compounds Chemical class 0.000 claims abstract description 33
- 210000001525 retina Anatomy 0.000 claims abstract description 25
- 230000000007 visual effect Effects 0.000 claims abstract description 21
- 208000014733 refractive error Diseases 0.000 claims abstract description 5
- 230000004379 myopia Effects 0.000 claims description 34
- 230000003287 optical effect Effects 0.000 claims description 27
- 201000009310 astigmatism Diseases 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 16
- 239000002131 composite material Substances 0.000 description 10
- 238000003384 imaging method Methods 0.000 description 7
- 206010020675 Hypermetropia Diseases 0.000 description 5
- 230000004305 hyperopia Effects 0.000 description 5
- 201000006318 hyperopia Diseases 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 208000029091 Refraction disease Diseases 0.000 description 2
- 230000004430 ametropia Effects 0.000 description 2
- 230000004329 axial myopia Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000000366 juvenile effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 210000002189 macula lutea Anatomy 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000004515 progressive myopia Effects 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
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- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Abstract
The invention discloses a defocused spectacle lens and a preparation mould thereof. The lens is formed by superposing a micro-lens array structure and a design surface for reducing side-center far vision defocus on a front refraction surface and a rear refraction surface of the lens respectively, or is formed by simultaneously attaching the micro-lens array structure and the design surface for reducing side-center far vision defocus on the same refraction surface of the lens; the lens comprises a central visual area for correcting refractive error of the eye, a far-vision defocus correction area for correcting far-vision defocus around the retina, and a compound near-vision defocus area for forming near-vision defocus and astigmatic defocus in different directions around the vision network. The invention sets side center far-vision defocus correction aiming at the non-micro lens area which is staggered with the micro lens area, determines reasonable area ratio, can still obtain peripheral far-vision defocus correction at intermittent time intervals of micro lens near-vision defocus alternation, forms continuous double correction function on the periphery of retina, is suitable for teenager wearing, and is beneficial to enhancing the function of delaying eye axis growth of lenses.
Description
Technical Field
The invention relates to an eyeglass lens, in particular to a double-sided composite myopia defocusing eyeglass lens suitable for inhibiting axial myopia of teenagers from deepening and a preparation mold thereof.
Background
The myopia progression rate is retarded by controlling the peripheral hyperopic defocus of the retina and performing an overcorrection design to inhibit the increase of the juvenile's ocular axis with the myopic defocus, which has become an optical method for the intervention of juvenile myopia as recognized in recent years. And multi-point defocus microlenses in combination with a near vision mirror are also one of such methods that have been popular in recent years. The lenses for forming myopia defocus by microlens multipoint forward defocus in the prior art can be seen in Chinese patent application No. 104678572A, CN110376758A and No. CN111095083A, but do not relate to peripheral defocus correction of the microlens-free region inside the microlens region. In order to achieve a better myopia defocus effect, chinese patent No. 104678572a discloses an ophthalmic lens in which a second refractive zone is formed near the central portion, the second refractive zone is formed as a plurality of independent island-type zones, and the zone other than the zone formed as the second refractive zone is the first refractive zone, thereby obtaining the effect of the first refractive zone for correcting ametropia and the second refractive zone for hyperopic defocus, but the technical solution of the present invention does not involve peripheral defocus correction connecting the zones between the respective microlenses.
According to the report of clinical detection of peripheral defocus data of retina of some present publications, for example, clinical detection report of document 'peripheral refraction study after myopia children wear monofocal lens' (International journal of ophthalmology 2013;13 (2): 339-342) shows that RPRE values in 10 degrees, 20 degrees and 30 degrees of field angle of naked eyes are 0.06D, 0.35D and 1.27D respectively, and RPRE is the far vision defocus; various patent documents related to multi-point forward defocus lenses relate to forward defocus amounts of each microlens, but no theoretically more reasonable correction method is given to defocus amounts in non-microlens areas, and it is proposed that imaging of the non-microlens areas still presents hyperopic defocus without optical correction from the viewpoint that defocus amounts of the non-microlens areas relative to the optical center are equal to 0. For example, the teenagers 'star interest control' product of French vision group has 11 ring belt micro lens arrays distributed around the visual area, the single micro lens diameter is 1.14mm, the ring belt interval is 2.2-2.5 mm, i.e. the non-micro lens area with 2.2-2.5 mm is formed in the area outside the micro lens ring belt, the imaging effect is shown in fig. 3 and 4, fig. 3 shows that parallel light rays are imaged in front of retina through the micro lens area, fig. 4 shows that the non-micro lens area, and the light rays are imaged behind retina without any correction effect. Another aspect not addressed by the prior art is astigmatic defocus of the microlens area; also, according to the clinical examination report disclosed in the above document, the detected open-eye or peripheral hyperopic defocus accompanied by astigmatic defocus, such astigmatic defocus having a definite directivity.
Therefore, in order to overcome the shortcomings of the prior art in the optical correction of the non-microlens area and the astigmatic defocus of the microlens area, a new design structure is necessary to solve the shortcomings of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the defocused spectacle lens which can form continuous double correction effect on the periphery of retina, is beneficial to enhancing the function of delaying the growth of the eye axis of the lens and is suitable for teenagers and a preparation mould thereof.
The technical scheme for realizing the purpose of the invention is that the defocusing spectacle lens is formed by superposing a micro-lens array structure and a design surface for reducing side-center far vision defocusing, which are respectively attached to a front refraction surface and a rear refraction surface of the lens, or is formed by simultaneously attaching the micro-lens array structure and the design surface for reducing side-center far vision defocusing to the same refraction surface of the lens;
the lens comprises a central visual area for correcting refractive errors of eyes, a far-vision defocus correction area for correcting far-vision defocus around retina, and a compound near-vision defocus area for forming near-vision defocus and astigmatism defocus in different directions around vision network; the center visible area is positioned in an area with a reading inward deflection corridor, wherein the center visible area is positioned outwards of the optical center of the lens, the short axis is 8-14 mm caliber, and the long axis is in the range of 8-16 mm caliber; the far-vision defocus correction area and the compound near-vision defocus area are surrounded on the periphery of the central visual area, the compound near-vision defocus area is formed by superposing a micro-lens array structure on a design surface for reducing side central far-vision defocus, the rest areas on the design surface for reducing side central far-vision defocus are far-vision defocus correction areas, and the area ratio of the far-vision defocus correction area to the compound near-vision defocus area is 1:0.3-1.5;
the defocus amount of the central visible area is less than or equal to 1.00D;
the focal power change of the design surface for reducing the side-center far vision defocus is radially distributed from the center to the edge in a circular or oval shape;
the defocus amount of the compound myopia defocus region comprises a myopia defocus amount and an astigmatism defocus amount, wherein the myopia defocus amount is the sum of the focal power of a single micro lens at the same position and the focal power variation amount of a near-center hyperopic defocus design surface, and is used for forming the myopia defocus of the periphery of retina; the astigmatic defocus amount is the cylindrical power of a point formed by overlapping the focal power of a single micro lens at the same position and the focal power of a design surface for reducing the side-center hyperopic defocus, and is used for correcting astigmatic defocus at the periphery of retina.
According to the technical scheme, a far-vision defocus compensation measurement reference point for reducing a near-center far-vision defocus design surface is arranged on an annular belt with the caliber of 36-40 mm of a lens, the focal power change amount at the reference point is more than or equal to 0.50D, and the astigmatic defocus value is more than or equal to 0.40D.
In the above technical solution, the microlens array structure is composed of positive focal power microlenses. The arrangement mode of the micro lens array structure is one of continuous annular arrangement, continuous non-annular arrangement and non-continuous non-annular arrangement around the central visual area. The design surface of the single micro lens in the micro lens array structure is one of a spherical surface, an aspherical surface, a toroidal surface and a toroidal surface.
In the right-hand space coordinate system, the lens meridian direction is downwards taken as an x-axis positive direction, the vertical meridian direction is rightwards taken as a y-axis positive direction, and the focal power distribution D (x, y) of the design surface for reducing the side-center far vision defocus is determined according to the following formula:
wherein u is the position coordinate on the meridian, D (u) is the focal power of x=u on the meridian, J is the highest term number of the polynomial, and a positive integer in 4-16 is taken; ai is a polynomial coefficient, w is a parameter for controlling the lens focal power distribution form, and 0<w is less than or equal to 1.
In the above technical solution, when w=1, the power distribution of the reduced paracentral hyperopic defocus design surface is a circular distribution, and the power distribution in the meridian direction is equal to the power distribution in the vertical meridian direction, D (x, 0) =d (0, y); when 0< w <1, the power distribution of the reduced side-center distance vision defocus design surface is elliptical, the power distribution in the meridian direction is D (x, 0), and the power distribution in the vertical meridian direction is D (0, y).
The out-of-focus spectacle lens is formed by injection molding of a metal mold or pouring of a glass mold into a required prescription luminosity or semi-finished product, and then the inner surface of the semi-finished product is processed by a car house to obtain the required prescription focal power.
The technical scheme of the invention also comprises the preparation mould of the defocused spectacle lens, wherein the metal mould or the glass mould consists of an upper mould base and a lower mould base, the working surface of the upper mould base is a concave surface and is used for forming the front refraction surface of the spectacle lens, and the working surface of the lower mould base is a convex surface and is used for forming the rear refraction surface of the spectacle lens.
According to the technical scheme of the invention, the implementation steps of the defocused spectacle lens are as follows:
establishing a right-hand space coordinate system by taking the downward direction of a meridian line of the lens as the positive direction of the x-axis and taking the rightward direction of the vertical meridian line as the positive direction of the y-axis; designing a design surface for reducing side center far vision defocus, determining defocus values of a specific caliber of a lens, fitting lens meridian focal power change conditions by using a least square method through a polynomial expression (1) as follows:
1
wherein D (x, 0) is the optical power at x=u on the meridian, a i Is a polynomial coefficient, n is the highest term number of the polynomial, and is positive integerA number.
The power ratio of the transverse power to the longitudinal power on the concentric ring of the reduced side-center far vision defocus design surface is w,0<w is less than or equal to 1, and the power distribution D (x, y) of the whole surface of the reduced side-center far vision defocus design surface is obtained by the following formula (2):
(2)
the radius of curvature distribution from the focal plane is then formula (3):
(3)
wherein n is the refractive index of the lens.
According to the technical solution disclosed in US patent 5123725, the center of curvature coordinates corresponding to the radii of curvature of the points of the design surface for reducing the side center distance vision defocus are calculated, and the center of curvature coordinates (, , ) corresponding to the radii of curvature of the points of the design surface for reducing the side center distance vision defocus are determined as formula (4):
(4)
wherein:
from the radius of curvature r and the corresponding center of curvature coordinates (, , ) of the reduced side-center distance defocus design face, the sagittal height of the reduced side-center distance defocus design face is calculated as equation (5):
(5)
in the second step, the sagittal height distribution of the individual microlenses is designed, and the individual microlenses can be spherical, aspherical, toroidal, and toroidal.
When a single microlens is spherical or aspherical, its sagittal expression is as follows:
wherein z is m Is the sagittal height of a single microlens,
C x and C y The curvatures in the X-direction and Y-direction of the individual microlenses respectively,
K x and K y The X-direction and Y-direction conic coefficients of the individual microlenses respectively,
A 2n high order term coefficients for a single microlens surface.
When K is x =K y =0C x =C y And A is 2n When=0, the single microlens is spherical;
when K is x =K y 0C x =C y And A is 2n When=0, the single microlens is aspherical;
when K is x =K y C x C y And A is 2n When the number is not equal to 0, the single micro lens is a toroidal surface;
when K is x K y C x C y And A is 2n At not equal to 0, the individual microlenses are toroidal.
The design surface for reducing the side center far vision defocus and the microlens array surface are overlapped to form a design surface, and the final design surface has the following sagittal height:
if the design surface for reducing the side-center distance vision defocus is positioned on the front surface or the rear surface of the lens, the microlens array surface is positioned on the other surface; if the reduced paracenter distance defocus design surface is located on the anterior or posterior surface of the lens or acts on both the anterior and posterior surfaces, the microlens array surface is located in the lens interlayer.
In the technical scheme of the invention, the focal power variation at a certain position is the absolute value of the difference between the focal power at the certain point and the optical center focal power.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the astigmatism defocus configuration is added for the micro lens structure, and according to clinical detection results, all the peripheral hyperopic defocus of the retina is accompanied by astigmatism, so that the peripheral myopia defocus correction is considered, and meanwhile, the astigmatism defocus correction is also considered.
2. The invention sets a paracentral hyperopic defocus correction design aiming at a non-microlens area staggered with a microlens area and determines a reasonable area ratio, thereby bringing the benefit that peripheral hyperopic defocus correction can be still obtained in intermittent periods when the retina is in microlens myopia defocus alternation; the paracentral hyperopic defocus correcting lens with the rotationally symmetrical design or the elliptical design has the effect of delaying the eye axis growth, thereby being capable of forming continuous double correction effects on the periphery of the retina and being beneficial to enhancing the eye axis growth delaying function of the lens.
Drawings
Fig. 1 is a schematic plan view showing the structure of a defocused spectacle lens and a microlens array structure according to embodiment 1 of the present invention;
FIG. 2 is a plot of the power profile of a reduced paracenter distance defocus design surface of a defocus ophthalmic lens provided in example 1 of the present invention;
FIG. 3 is a schematic illustration of the effect of parallel rays of light imaged in front of the retina through a microlens region;
FIG. 4 is a schematic representation of the effect of prior art parallel rays imaged behind the retina through a non-microlens region;
FIG. 5 is a schematic view of the imaging effect of a parallel ray passing through a double-sided compound defocus ophthalmic lens provided by the present invention;
FIG. 6 is a schematic view showing the distribution of the defocus regions of a defocus ophthalmic lens with an on-corridor according to example 2 of the present invention;
FIG. 7 is a schematic structural view of a non-annular microlens array with single microlenses of toroidal surface arranged in succession for a double-sided compound near-sighted defocus lens according to embodiment 3 of the present invention;
FIG. 8 is a profile view of an elliptical profile of the power of the side-center distance vision defocus design surface of a double-sided compound near vision defocus lens provided in example 3 of the present invention;
FIG. 9 is a schematic view of the rotation angle of a single microlens of a double-sided compound near-sighted defocus lens of example 3 provided by the present invention;
in the figure, 1, an ophthalmic lens; 2. a central visual area, a compound myopia defocus area, a hyperopia defocus correction area; 5. reading the inward-deflection rotation angle; 6. a single microlens with a toroidal surface.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a double-sided composite myopia defocus lens with a material of Polycarbonate (PC), a refractive index of 1.59 and a central focal power of-4.00D, wherein an upper die holder of the lens is a metal material of a microlens array surface, an apex base curve of a working surface is-1.50D, a continuous annular microlens array and a microlens array with a microlens shape of a single microlens curved surface being spherical are adopted for microlens array distribution, the positive focal power of the single microlens is 3.00D and sequentially arranged outwards in an annular manner, a lower die holder is a metal material for reducing a side-center hyperopic defocus design surface, the apex base curve of the working surface is 5.50D, the focal power distribution is in a circular distribution design, the focal power change is as shown in fig. 2, the microlens array surface formed by thermoplastic processing acts on the front surface of the lens, the side-center hyperopic defocus design surface acts on the rear surface of the lens, and the defocus amount Dx of the rear surface in the radial X axial direction is calculated by the following steps:
the polynomial coefficients are respectively:
the calculation method of the defocus Dy of the vertical meridian y-axis direction of the design surface comprises the following steps:
Dy=Dx/w
wherein w=1.
Referring to fig. 1, a schematic plan view of a structure of a defocus spectacle lens and a microlens array structure according to the present embodiment is shown; the optical center of the spectacle lens 1 is positioned in the geometric center, and the central visual area 2 is enclosed in the aperture range of 12mm of the optical center; the compound myopia defocus region 3 and the far-vision defocus correction region 4 are surrounded on the periphery of the central visual region, the compound myopia defocus region 3 is formed by overlapping a lens rear surface and a side-center far-vision defocus design surface by a micro lens array with 8 annular zones distributed on the front surface of the lens, and the non-micro lens region is a far-vision defocus correction region. The defocus amount of a certain position in the compound myopia defocus region is formed by superposing the focal power variation amount of the reduced side center hyperopic defocus design surface at the same position on the focal power of a single microlens in an annular zone of the position, the compound myopia defocus region is positioned in the caliber range of 12-55 mm at the periphery of the visible region, and the myopia defocus amounts can be formed on each annular zone in the region as shown in the following table 1.
TABLE 1
The defocus amounts of the distance vision defocus correction regions of the non-microlens regions were arranged by the design surface of the rear surface of the spectacle lens, and the power in each axial direction tended to increase from 10mm to the lens edge, and the power change amounts were as shown in table 2 below.
TABLE 2
| Caliber of | 10mm | 20mm | 30mm | 40mm | 50mm | 60mm | 70mm |
| Optical power variation | 0.20D | 0.60D | 0.98D | 1.34D | 1.69D | 2.00D | 2.33D |
The area ratio of the far-vision defocus correction region to the composite near-vision defocus region is 1:0.4.
through reasonable configuration of the three defocused areas, the central visual area of the spectacle lens is provided with a central visual area for imaging objects on the macula lutea fovea of the retina and correcting ametropia; the compound myopia defocusing area has gradually increased defocusing amount, can image peripheral objects in front of retina, and the imaging effect is shown in figure 3; meanwhile, the far-vision defocus correction area has the function of correcting far-vision defocus, and the imaging effect of the far-vision defocus correction area has the function shown in the figure 5; the compound myopia defocus region and the hyperopic defocus correction region can perform hyperopic defocus compensation, so that peripheral hyperopic defocus correction can be obtained even when the retina is in an intermittent period of alternation of the myopia defocus of the microlens. The far-vision defocus generated in the non-microlens area of the spectacle lens designed by the traditional microlens array has the imaging effect shown in figure 4, and the parallel rays are imaged behind the retina through the non-microlens area, so that the far-vision defocus correction effect is not achieved, and the functionality of the product is obviously reduced.
Example 2
The embodiment provides a resin lens made of polyurethane, a double-sided composite myopia defocus lens with a refractive index of 1.67 and a central focal power of-3.00D, an upper die holder of the lens is made of a glass material with a microlens array surface, the vertex base curve of a working surface is-3.50D, the microlens array is distributed by adopting a discontinuous annular microlens array with a reading inward-deflection corridor and a single microlens curved surface as an aspheric surface, the single microlens focal power is 3.5D and sequentially and outwards arranged in a discontinuous annular arrangement, a lower die holder is made of a glass material with a spherical design, the vertex base curve of the working surface is 8.5D, the front surface of the lens formed by a thermal curing process is provided with a finished product with a microlens array rear surface which is spherical, the rear surface of a semi-finished product is processed by a car house, and the vertex curvature of the rear surface design is a rotationally symmetrical reduced side central hyperopia defocus design surface of-6.50D.
The defocused spectacle lens with the central focal power of-3.00D is formed by car house processing, and is a defocused spectacle lens with an inward deflection corridor.
Referring to fig. 6, a schematic structural distribution diagram of a defocus lens with an inward-deflection corridor according to the present embodiment is provided; the optical center is positioned in the geometric center, the central visual area 2 is positioned in the cross shaft 10mm at the periphery of the optical center, the maximum diameter of the longitudinal axis is 15mm in an elliptical area, the compound myopia defocus area 3 and the hyperopia defocus correction area 4 are positioned in the caliber range of 55mm at the periphery of the central visual area, the longitudinal axis is provided with a reading internal deflection corridor rotating towards the nose side, the rotation angle of the reading internal deflection rotation angle 5 is 8-12 degrees, and the defocus amount calculation method of each axial direction in the area comprises the following steps: the focal power of a single microlens+the focal power variation of a reduced paracentral distance defocus design surface at the same position; the amount of defocus that can form near vision on each zone in the zone is shown in table 3 below.
TABLE 3 Table 3
The defocus amount of the far vision defocus correction region of the non-microlens region is configured by the design face of the rear surface of the spectacle lens, the defocus amount of this region increases from the half-caliber of the lens 10mm to the edge of the lens, and the optical power variation is the same as that of example 1; the area ratio of the far-vision defocus correction area to the composite near-vision defocus area is as follows: 1:0.3
Through the superposition design of the visual area with the reading corridor, the composite myopia defocusing area and the correction hyperopia defocusing area, the functions described in the embodiment 1 are obtained, meanwhile, the downward longitudinal visual field range of the reading area is enlarged, and the condition that the vision is easy to fall into the micro lens area when teenagers perform short-distance work such as reading is prevented, so that the defect that the vision cannot be watched during reading is caused, and wearing discomfort is caused.
The design provided by this embodiment improves the comfort of looking near when worn.
Example 3
According to the clinical detection report results of "peripheral refraction study after wearing a single-focus lens by a myopic child" (International journal of ophthalmology 2013;13 (2): 339-342) published by the medical institute of China Dai Yusen et al, the open hole in Table 1 of the document corrects astigmatism in the directions of far-view defocus RPRE and J180 (i.e., 180 degrees) at different angles of view, and provides a double-sided composite near-view defocus ophthalmic lens made of allyl resin, having a refractive index of 1.499 and a central focal power of-3.75D; the micro lens array is attached to the front surface of the spectacle lens, and the back surface is provided with a lens with elliptical focal power distribution and reduced side-center far-vision defocus.
The structure of the microlens array is designed according to the following structure:
referring to fig. 7, a schematic structural diagram of a non-annular microlens array with single microlenses of a double-sided composite near-sighted defocus lens according to the present embodiment being continuously arranged with annular curved surfaces is shown; as can be seen from fig. 7, the arrangement mode of the microlens array is a non-annular ring array which is continuous around the hexagonal visual area, the compound myopia defocus area 3 and the hyperopia defocus correction area 4 are enclosed at the periphery of the central visual area 2, and the microlenses adopt single annular surface microlenses 6 with adjustable angles, so that the astigmatism axes are located in different directions of the spectacle lens, thereby forming astigmatism defocus in different directions, and meeting the requirements of the astigmatism axes around the retina of different teenagers.
The single microlens is a toroidal curved surface, the meridian direction DX is the vertical direction of the toroidal curved surface, and the vertical meridian direction DY is the horizontal direction of the toroidal curved surface.
The focal power of dx=5.5d, the focal power of dy=3.5d, and the maximum focal power in DX direction, and the two directions are respectively provided with different positive focal powers, so that astigmatic defocus, i.e., dc=dx-DY, is formed, and the astigmatic axis is the horizontal direction of the ophthalmic lens, i.e., 180-degree astigmatic defocus dc=5.5d-3.5d=2.0d.
The design for reducing the paracentral hyperopic defocus design surface adopts an elliptical distribution of the design for reducing the paracentral hyperopic defocus, and the optical power distribution is as follows:
the polynomial coefficients are respectively in table 4.
TABLE 4 Table 4
| Coefficients of | a 0 | a 1 | a 2 | a 3 | a 4 |
| Value of | 3.21 | 2.53e-2 | 2.63e-5 | 1.89e-4 | 6.52e-7 |
The method for calculating the defocus Dy of the vertical meridian in the y-axis direction in the region comprises the following steps:
Dy=Dx/w
where w=0.85.
Referring to fig. 8, a profile view of an elliptical distribution of power of a side-center distance vision defocus design surface of a double-sided composite near vision defocus lens according to the present embodiment; the variation of defocus in the Dx direction is shown in Table 5 below.
TABLE 5
| Caliber of | 10mm | 20mm | 30mm | 40mm | 50mm | 60mm | 70mm |
| Optical power variation | 0.26D | 0.77D | 1.25D | 1.70D | 2.15D | 2.54D | 2.96D |
The change in defocus amount in the Dy direction obtained is shown in table 6 below.
TABLE 6
| Caliber of | 10mm | 20mm | 30mm | 40mm | 50mm | 60mm | 70mm |
| Optical power variation | 0.20D | 0.60D | 0.98D | 1.34D | 1.69D | 2.00D | 2.33D |
Because of the different power changes in the Dx and Dy directions of the reduced side-center distance vision defocus design surface, astigmatism defocus occurs at each axial position of the design surface, the astigmatism direction is in the horizontal direction, and the astigmatism value dc=dx-Dy at each axial position is shown in table 7 below.
TABLE 7
| Caliber of | 10mm | 20mm | 30mm | 40mm | 50mm | 60mm | 70mm |
| Dx optical power variation | 0.26D | 0.77D | 1.25D | 1.70D | 2.15D | 2.54D | 2.96D |
| Dy focal power variation | 0.20D | 0.60D | 0.98D | 1.34D | 1.69D | 2.00D | 2.33D |
| Astigmatic defocus value | 0.06D | 0.17D | 0.27D | 0.36D | 0.46D | 0.54D | 0.63D |
The design surface of the micro lens array is overlapped with the far-vision defocus design surface to form a defocus spectacle lens, which consists of a central visual area, a far-vision defocus correction area and a compound near-vision defocus area,
the geometric center of the spectacle lens is an optical center, the central visual area is 12mm long axis, and hexagons with 9mm short axis are distributed on the periphery of the optical center.
The compound myopia defocus region surrounds the periphery of the visible region; the near vision defocus amount comprises a superposition defocus amount in a meridian direction and a superposition defocus amount in a vertical meridian direction; the radial superimposed defocus amount is configured by superimposing a single toroidal microlens of the microlens array face and a design face for reducing paracentral hyperopic defocus. The area ratio of the far-vision defocus correction area to the composite near-vision defocus area is as follows: 1:1.
the overlapped defocus amount in the meridian direction is the focal power change value of the same position of the lens meridian direction focal power Dx+back surface reduced side center far vision defocus design surface, and the overlapped defocus amount in the meridian direction presents an increasing trend from 10mm to 55mm caliber. As shown in table 8 below.
TABLE 8
| Caliber of | 12mm | 17mm | 22mm | 27mm | 32mm | 37mm | 42mm | 47mm | 52mm |
| Single microlens Dx optical power | 5.5D | 5.5D | 5.5D | 5.5D | 5.5D | 5.5D | 5.5D | 5.5D | 5.5D |
| Optical power variation of Dx at the same position of rear surface | 0.36D | 0.62D | 0.87D | 1.10D | 1.34D | 1.56D | 1.80D | 2.00D | 2.22D |
| Vertical meridian superimposed defocus amount of compound myopia defocus region | 5.86D | 6.12D | 6.37D | 6.60D | 6.84D | 7.16D | 7.30D | 7.50D | 7.72D |
The defocus amount in the vertical meridian direction is the focal power Dy+ of the micro lens in the vertical meridian direction, the focal power change value of the same position of the side center far vision defocus design surface is reduced, and the defocus amount in the meridian direction after superposition presents an increasing trend from 10mm to 55mm caliber. As shown in table 9 below.
TABLE 9
| Caliber of | 12mm | 17mm | 22mm | 27mm | 32mm | 37mm | 42mm | 47mm | 52mm |
| Dy focal power of single microlens | 3.5D | 3.5D | 3.5D | 3.5D | 3.5D | 3.5D | 3.5D | 3.5D | 3.5D |
| Optical power variation of Dy at the same position of the rear surface | 0.21D | 0.50D | 0.63D | 0.88D | 1.02D | 1.28D | 1.38D | 1.50D | 1.74D |
| Horizontal meridian direction superposition defocus amount of compound myopia defocus region | 3.71D | 4.00D | 4.13D | 4.33D | 4.52D | 4.78D | 4.88D | 5.00D | 5.24D |
Astigmatic defocus amount dc=dx-DY, astigmatic defocus values are shown in table 10 below.
Table 10
Through the compensation design of the far-sight defocus correction area, the near-sight defocus compensation and the astigmatism defocus compensation design of the compound near-sight defocus area, the vertical meridian direction of the compound near-sight defocus area of the spectacle lens has 3.71D-5.24D defocus amount, so that the functions of forming peripheral near-sight defocus are completely met by clinical report of each view angle RPRE value of a warm doctor, and meanwhile, the astigmatism defocus compensation of-2.15D-2.48D is carried out, the astigmatism direction is in the 180-degree direction, and the astigmatism compensation of each view angle in the direction of correcting retina J180 is carried out; the far vision defocus correction region is used as a non-micro lens region, the progressive power change amount of 0.20D to 2.33D and the astigmatism defocus amount of 0.06D to 0.63D of the non-micro lens region from 10mm caliber to 70mm caliber in the meridian direction still has the effect of correcting far vision defocus and astigmatism defocus relative to the RPRE value and the astigmatism value in the J180 direction; the myopia defocus and astigmatism formed by the compound myopia defocus region are matched with the hyperopic defocus correction design of the non-microlens region, and defocus and astigmatism defocus effects are formed in different regions, so that the ophthalmic lens has stronger function of inhibiting teenager axial myopia.
Also, according to the microlens structure of embodiment 3, DX of the toroidal microlens has optical power=5.5d, DY has optical power=3.5d, and the maximum optical power is in DX direction, so that astigmatism is formed, i.e. dc=dx-DY, and the axis of astigmatism is the horizontal direction of the spectacle lens, see fig. 9, which is a schematic diagram of rotatable angle of a single microlens of a double-sided compound myopia-defocus lens according to the present embodiment; the single microlens 6 with the annular curved surface can rotate the angle of the microlens to enable the astigmatic axis to be in different directions of the spectacle lens, so that astigmatic defocus in different directions is formed, and the requirements of astigmatic axis positions of the periphery of retina of different teenagers are met.
Claims (9)
1. A defocus ophthalmic lens characterized by: the lens is formed by superposing a micro-lens array structure and a design surface for reducing side-center far vision defocus, which are respectively attached to a front refraction surface and a rear refraction surface of the lens, or is formed by simultaneously attaching the micro-lens array structure and the design surface for reducing side-center far vision defocus to the same refraction surface of the lens;
the lens comprises a central visual area (2) for correcting refractive errors of eyes, a far-vision defocus correction area (4) for correcting far-vision defocus around retina, and a compound near-vision defocus area (3) for forming near-vision defocus and astigmatic defocus in different directions around vision network; the center visible area is positioned in an area with a reading inward deflection corridor, wherein the center visible area is positioned outwards of the optical center of the lens, the short axis is 8-14 mm caliber, and the long axis is in the range of 8-16 mm caliber; the far-vision defocus correction area and the compound near-vision defocus area are surrounded on the periphery of the central visual area, the compound near-vision defocus area is formed by superposing a micro-lens array structure on a design surface for reducing side central far-vision defocus, the rest areas on the design surface for reducing side central far-vision defocus are far-vision defocus correction areas, and the area ratio of the far-vision defocus correction area to the compound near-vision defocus area is 1:0.3-1.5;
the defocus amount of the central visible area is less than or equal to 1.00D;
the focal power change of the design surface for reducing the side-center far vision defocus is radially distributed from the center to the edge in a circular or oval shape;
the defocus amount of the compound myopia defocus region comprises a myopia defocus amount and an astigmatism defocus amount, wherein the myopia defocus amount is the sum of the focal power of a single micro lens at the same position and the focal power variation amount of a near-center hyperopic defocus design surface, and is used for forming the myopia defocus of the periphery of retina; the astigmatic defocus amount is the cylindrical power of a point formed by overlapping the focal power of a single micro lens at the same position and the focal power of a design surface for reducing the side-center hyperopic defocus, and is used for correcting astigmatic defocus at the periphery of retina;
the defocus amount of the far-vision defocus correction region of the non-microlens region is configured by the design surface of the rear surface of the spectacle lens, the optical power of each axial direction is gradually increased from 10mm to the edge of the spectacle lens, and the compound near-vision defocus region has gradually increased defocus amount.
2. An out-of-focus ophthalmic lens according to claim 1, characterized in that: the method comprises the steps of setting a far-vision defocus compensation measurement reference point for reducing a near-center far-vision defocus design surface on an annular belt with the aperture of 36-40 mm of a lens, wherein the focal power change amount at the reference point is more than or equal to 0.50D, and the astigmatism defocus value is more than or equal to 0.40D.
3. An out-of-focus ophthalmic lens according to claim 1, characterized in that: the microlens array structure is composed of positive-power microlenses.
4. An out-of-focus ophthalmic lens according to claim 1, characterized in that: the arrangement mode of the micro lens array structure is one of continuous annular arrangement, continuous non-annular arrangement and non-continuous non-annular arrangement around the central visual area.
5. An out-of-focus ophthalmic lens according to claim 1, characterized in that: the design surface of the single micro lens in the micro lens array structure is one of a spherical surface, an aspherical surface, a toroidal surface and a toroidal surface.
6. An out-of-focus ophthalmic lens according to claim 1, characterized in that: in the right-hand space coordinate system, the lens meridian direction is downwards taken as an x-axis positive direction, the vertical meridian direction is rightwards taken as a y-axis positive direction, and the focal power distribution D (x, y) of the reduced side-center far vision defocus design surface is determined according to the following formula:
wherein u is the position coordinate on the meridian, D (u) is the focal power of x=u on the meridian, J is the highest term number of the polynomial, and a positive integer in 4-16 is taken; ai is a polynomial coefficient, w is a parameter for controlling the lens focal power distribution form, and 0<w is less than or equal to 1.
7. An out-of-focus ophthalmic lens as defined in claim 6, wherein: when w=1, the power distribution of the reduced side-center distance vision defocus design surface is in a circular distribution, the power distribution in the meridian direction is equal to the power distribution in the vertical meridian direction, and D (x, 0) =d (0, y); when 0< w <1, the power distribution of the reduced side-center distance vision defocus design surface is elliptical, the power distribution in the meridian direction is D (x, 0), and the power distribution in the vertical meridian direction is D (0, y).
8. An out-of-focus ophthalmic lens according to claim 1, characterized in that: the lens is formed into a required prescription luminosity or semi-finished product by injection molding of a metal mold or pouring of a glass mold, and then the inner surface of the semi-finished product is processed by a car house to obtain the required prescription focal power.
9. A mold for preparing an out-of-focus ophthalmic lens as defined in claim 1, wherein: the metal mold or the glass mold consists of an upper mold base and a lower mold base, wherein the working surface of the upper mold base is a concave surface and is used for forming the front refraction surface of the spectacle lens, and the working surface of the lower mold base is a convex surface and is used for forming the rear refraction surface of the spectacle lens.
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| CN111103701A (en) * | 2020-01-02 | 2020-05-05 | 温州医科大学 | Spectacle lens with annulus cylindrical microstructure on surface |
| CN113655634A (en) * | 2021-08-27 | 2021-11-16 | 苏州明世光学科技有限公司 | Lens capable of reducing side-center defocusing and design method thereof |
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| CN111103701A (en) * | 2020-01-02 | 2020-05-05 | 温州医科大学 | Spectacle lens with annulus cylindrical microstructure on surface |
| CN215494400U (en) * | 2021-06-09 | 2022-01-11 | 苏州明世光学科技有限公司 | Myopia out-of-focus spectacle lens with superposed micro-lenses |
| CN215006124U (en) * | 2021-06-24 | 2021-12-03 | 苏州大学 | Asymmetric multi-point peripheral myopic out-of-focus spectacle lens for juvenile myopia control |
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