CN113253481A - Spectacle lens with invisible microstructure - Google Patents
Spectacle lens with invisible microstructure Download PDFInfo
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- CN113253481A CN113253481A CN202110507447.8A CN202110507447A CN113253481A CN 113253481 A CN113253481 A CN 113253481A CN 202110507447 A CN202110507447 A CN 202110507447A CN 113253481 A CN113253481 A CN 113253481A
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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Abstract
The invention discloses a spectacle lens with a contact microstructure, which comprises an object side surface and an eye side surface, a first refraction area and a second refraction area, wherein the first refraction area has a first refractive power for correcting ametropia of an eye; and a second dioptric region having a refractive power different from the first refractive power and having a function of imaging an object on a position other than a retina of the eye to suppress development of ametropia of the eye, characterized in that: the second refraction area is composed of a plurality of circular sub-areas distributed on the surface of the eye side, the diameter of each sub-area ranges from 2mm to 6mm, each sub-area is provided with a plurality of annular etching grooves, the width of each etching groove ranges from 30 micrometers to 100 micrometers, and the distribution and the depth of the etching grooves enable the sub-areas to form a micro-lens structure and provide second refractive power. The invention can inhibit the development of myopia without affecting the beauty of the spectacle lens.
Description
Technical Field
The invention relates to an ophthalmic lens, in particular to an ophthalmic lens with a microstructure, in particular to an ophthalmic lens with a contact microstructure.
Background
Human eyes are crucial for human information acquisition, and statistically more than 80% of human information acquisition originates from the eyes. At present, various electronic screens are flooded in social life, which emit light with different intensities, and the daily use time of human eyes is longer and longer, so that the human eyes continuously generate ametropia, and the ametropia is increasing. According to incomplete statistics, over 80% of college students have refractive errors above 200 degrees.
On the basis of the refractive correction, functional spectacle lenses have emerged which have the function of inhibiting the ametropia of the human eye. For example, a lens having a concentric fresnel multifocal shape is provided, and a plurality of dioptric regions are concentrically arranged in the lens, and this lens has a function of focusing an image on the retina of the spectacles, and if a patient views an object using the lens for inhibiting myopia, the image of the object is formed on the retina, and an image is formed at a point in front of the retina, so that an effect of inhibiting the progression of myopia can be obtained by two images during visual observation.
Chinese patent CN 104678572B discloses an ophthalmic lens in which several small area lenses with a circular shape and a diameter of about 0.8mm to 2mm are arranged in different areas to form a second dioptric area. The progression of myopia is suppressed by an image obtained in front of the retina by the second dioptric region while visually distinguishing an image of the object formed by the first refractive power. Meanwhile, the second dioptric region is not formed in a circular region having a radius of 2.5mm to 10.0mm with the optical center of the spectacle lens as the center, in order to maintain sufficient visibility and obtain a good wearing feeling. In the above-described aspect, as seen from the examples, the small area lens of a circular shape for forming the second dioptric region is arranged on the object-side surface of the spectacle lens.
For ophthalmic lenses, as shown in fig. 1, there is an object side surface 1 and an eye side surface 2. In actual production, the eye-side surface 2 is a fixed spherical, aspherical or astigmatic surface, the object-side surface 1 is processed into, for example, a spherical, aspherical or progressive surface, and a small-area mirror in document CN 104678572B is also provided on the object-side surface 1. As a result, there are a plurality of small bumps or depressions on the surface of the ophthalmic lens to form the second dioptric zone, which results in the ophthalmic lens being aesthetically significant and affecting the visual appearance. Meanwhile, when the object side surface 1 is a progressive surface, the difficulty of designing and manufacturing the small-area lens is also increased, so that the structural design is not suitable for the progressive spectacle lens.
Disclosure of Invention
The present invention has an object to provide a spectacle lens having a contact microstructure which can suppress a continuous increase in ametropia of an eye, ensure sufficient visibility and a good wearing feeling, ensure the beauty of the spectacle lens, and can be suitably used for a progressive spectacle lens.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: an ophthalmic lens having a contact microstructure, having an object-side surface and an eye-side surface, comprising a first refractive area having a first refractive power based on a refractive error of the corrected eye; and a second dioptric region having a refractive power different from the first refractive power and having a function of imaging an object at a position other than a retina of the eye to suppress development of ametropia of the eye, the second dioptric region being composed of a plurality of circular sub-regions distributed on an eye-side surface, each sub-region having a diameter of 2mm to 6mm, each sub-region having a plurality of annular etched grooves, a width of the etched grooves being 30 to 100 micrometers, the distribution and depth of the etched grooves causing the sub-regions to form a microlens structure and provide the second refractive power.
In the above technical scheme, by engraving the annular groove, the two sides of the main focal plane are equally provided with the second focal planes simultaneously due to the interference imaging. The front and rear focal planes are equidistant from the main focal plane, and the energies of the front and rear focal planes are the same, thereby suppressing the progression of ametropia. The width of the etched groove is 30-100 micrometers, the etched groove cannot be seen by naked eyes, and the micro-lens etching groove has an attractive function and also has a micro-lens function.
In the above technical solution, the structure of the sub-region is determined by the following steps:
(1) according to the refractive index n of the lens, the radius of curvature r of the front and back surfaces1、r2Calculating to obtain an equivalent curvature radius r of a secondary region, wherein the primary focal length F is the focal length of a primary focal surface corresponding to the first refraction region, and the focal surface distance d is the distance between the primary focal surface and the secondary focal surface corresponding to the second refraction region;
(2) dividing the zone of the secondary region according to the diameter of the secondary region and the equivalent curvature radius r, wherein the method comprises the following steps:
a. dividing the curved surface of the secondary region by adopting a Fresnel zone plate-like mode according to the phase change of 2pi or pi to obtain 3-5 annular zones;
b. if the phase dividing unit is 2pi, the binarization is carried out by changing pi, the setting larger than pi is a base surface, and the area smaller than pi is etched to remove the pi phase depth; if the phase dividing unit is pi, the binarization needs to be carried out by changing pi/2, the area which is larger than pi/2 is set as a base surface, and the area which is smaller than pi/2 is etched to remove the pi/2 phase depth;
c. and adjusting the etching width to ensure that the width of the etching groove is 30-100 microns, and completing the division of the girdle band of the secondary area.
In the above technical solution, within the range of the distribution of the sub-regions, the first dioptric region and the second dioptric region form a mixed region, wherein the area of the second dioptric region formed by the sub-regions is 20% to 60% of the total area of the mixed region.
In a preferred embodiment, the area of the second refraction zone formed by the sub-zones is 30 to 40 percent of the total area of the mixed zone.
In a preferred embodiment, the sub-regions are uniformly distributed in the mixing region.
In a preferred embodiment, the eye-side surface is a spherical surface, and the object-side surface is a spherical surface, an aspherical surface, or a progressive surface.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention sets the sub-area for forming the second dioptric area on the surface of the eye side, so that the spherical surface can be selected for the surface of the eye side, the design and the processing are convenient to realize, and the shape design of the object side surface is not influenced, so that the invention can be suitable for the application occasions of progressive spectacle lenses;
2. the invention forms an equivalent micro-lens structure through the annular groove, the width of the groove is not more than 100 microns, the groove is difficult to distinguish by naked eyes, and the appearance of the spectacle lens is not influenced while the development of myopia can be inhibited.
Drawings
FIG. 1 is a schematic view of the construction of an ophthalmic lens;
FIG. 2 is a schematic diagram of the optical path of the embodiment;
FIG. 3 is a schematic diagram showing a design process of a sub-area in the embodiment;
FIG. 4 is a schematic diagram of a design process of a sub-region in another embodiment.
Wherein: 1. an object-side surface; 2. the eye-side surface.
Detailed Description
The invention is further described with reference to the following figures and examples:
the first embodiment is as follows: an ophthalmic lens having a contact microstructure, as shown in fig. 1, has an object side surface 1 and an eye side surface 2. For the eye-side surface 2, after the conventional spherical surface processing, a circular groove is engraved on the spherical surface, and after the groove is engraved, the two sides of the focal plane are equivalent to have the second focal planes simultaneously due to interference imaging. The distances between the front focal plane and the rear focal plane are equal to the distance between the main focal plane and the front focal plane, and the energies of the front focal plane and the rear focal plane are equal.
Referring to fig. 2, the main lens is a main lens of the lens, and the focal length thereof, i.e., the main focal length, is set to be F; the micro lens is a secondary lens, the focal length of the micro lens is set to be f, and the distance between a secondary focal plane and a primary focal plane is set to be d. Knowing the main focal length F and the focal plane difference d, the sub-focal length can be calculated.
The focal length of the lens is determined by the radius of curvature r of the two faces of the lens1、r2Thickness and refractive index n. The thickness of the glasses is very small, the distance between the glasses can be considered to be close to 0, and the focal length of the glasses can be written as
According to r1，r2And d, calculating the curvature radius r of the equivalent micro-lens in the secondary area by the refractive index of the lens. The calculation steps are as follows:
A. first according to r1，r2N, calculating the focal length F of the main lens;
B. calculating a secondary lens focal length F according to the primary lens focal lengths F and d;
C. according to r1And calculating the curvature radius r of the second surface of the secondary lens according to the focal length f and the refractive index n of the secondary lens.
The radius of curvature r of the secondary mirror is thus obtained.
Example 1:
n =1.597 (nominal refractive index 1.6), 300 degrees myopia. The first face radius of curvature was 392.76mm, the second face radius of curvature was 131.2mm, and the center thickness was 1.2. A lens with a primary focal length of 330mm, a focal plane advancement of 10mm if required, and a secondary focal length of 320mm can be obtained, thus calculating a secondary radius of curvature of 128.5 mm. If a focal plane advancement of 20mm is required, the calculated minor radius of curvature is 125.8 mm.
Example 2:
n =1.499 (nominal refractive index 1.49), 400 degrees of myopia. The radius of curvature of the first face is 457.8mm, the radius of curvature of the second face is 98mm, the center thickness is 1.2mm, and the focal length of the lens is calculated to be 249.9mm, and if a focal plane 10mm back is desired, the radius of curvature is 104.07 mm. If a 40mm back-shift of the focal plane is required, a radius of curvature of 109.9mm is calculated. If a 100mm back shift is required, the minor radius of curvature is calculated to be 126.4 mm.
Example 3:
n =1.499 (nominal refractive index 1.49), 400 degrees of myopia. The radius of curvature of the first face was 457.8mm, the radius of curvature of the second face was 98mm, and the center thickness was 1.2. A lens focal length of 249.9mm and if a focal plane advancement of 40mm is required, a secondary focal length of 209.9mm can be obtained, thus calculating a secondary radius of curvature of 85.24 mm.
After obtaining the secondary curvature radius, the zone division and groove width setting of the secondary region are performed to determine the structure of the secondary region.
The method comprises the following steps:
A. the division is done according to the phase change 2pi (2 pi), which is handled as a fresnel zone plate.
B. If the turns of the 2pi phase division are changed too few, the division can be done on a pi basis. Generally, at least 3-5 ring bands are required to form interference images.
C. If the phase dividing unit is 2pi, the binarization needs to be carried out by changing pi, the area which is larger than pi is set as a base surface, and the area which is smaller than pi is etched to remove the pi phase depth. If the phase dividing unit is pi, the binarization needs to be carried out by changing pi/2, the area which is larger than pi/2 is set as a base surface, and the area which is smaller than pi/2 is etched to remove the pi/2 phase depth.
D. According to the above step processing, a duty ratio similar to 50% is obtained. According to the definition of diffraction optics, the duty ratio only changes the diffraction efficiency and does not change the phase, namely, the duty ratio is adjusted, the focal length is not influenced, and only the energy is influenced. The etch width is adjusted to be between 30 and 100 microns (where the entire face needs to be calculated so that the width of all the loops is uniform for ease of fabrication). The line width of the film with the thickness of more than 100 microns can be easily acquired by human eyes, and the invisible effect is avoided.
Referring to fig. 3, the process of zone division and groove width setting for the spectacle lens of example 3 is performed by the above method.
In example 3, the calculated minor radius of curvature was 85.24 mm. The phase is changed by 2pi, and the thickness d =0.55um/(1.499-1) =1.1 um. That is, when the difference in thickness is 1.1 μm, division into one turn is required. Assuming a circular zone diameter of 3mm, the sagittal height difference is 1.7 microns, considering a 1.1 micron change of 2pi, the division needs to be finer, i.e. 0.55 micron divides one turn, i.e. 1.7/0.55=3 turns can be divided within the entire 3mm diameter. In this case, the interference diffraction condition can be satisfied.
Fig. 4 is a schematic diagram of a setup process according to another embodiment. The calculated minor radius of curvature is 65.24 mm. The phase is changed by 2pi, and the thickness d =0.55um/(1.499-1) =1.1 um. That is, when the difference in thickness is 1.1 μm, division into one turn is required. Assuming a circular zone diameter of 3mm, the sagittal height difference is 4.2 microns, taking into account 0.55 micron for one revolution, i.e. 4.2/0.55=7 revolutions for the entire 3mm diameter.
Claims (6)
1. An ophthalmic lens having a contact microstructure, having an object-side surface and an eye-side surface, comprising a first refractive area having a first refractive power based on a refractive error of the corrected eye; and a second dioptric region having a refractive power different from the first refractive power and having a function of imaging an object on a position other than a retina of the eye to suppress development of ametropia of the eye, characterized in that: the second refraction area is composed of a plurality of circular sub-areas distributed on the surface of the eye side, the diameter of each sub-area ranges from 2mm to 6mm, each sub-area is provided with a plurality of annular etching grooves, the width of each etching groove ranges from 30 micrometers to 100 micrometers, and the distribution and the depth of the etching grooves enable the sub-areas to form a micro-lens structure and provide second refractive power.
2. The ophthalmic lens with a contact microstructure according to claim 1, wherein: the structure of the secondary region is determined by the following steps:
(1) according to the refractive index n of the lens, the radius of curvature r of the front and back surfaces1、r2Calculating to obtain an equivalent curvature radius r of a secondary region, wherein the primary focal length F is the focal length of a primary focal surface corresponding to the first refraction region, and the focal surface distance d is the distance between the primary focal surface and the secondary focal surface corresponding to the second refraction region;
(2) dividing the zone of the secondary region according to the diameter of the secondary region and the equivalent curvature radius r, wherein the method comprises the following steps:
a. dividing the curved surface of the secondary region by adopting a Fresnel zone plate-like mode according to the phase change of 2pi or pi to obtain 3-5 annular zones;
b. if the phase dividing unit is 2pi, the binarization is carried out by changing pi, the setting larger than pi is a base surface, and the area smaller than pi is etched to remove the pi phase depth; if the phase dividing unit is pi, the binarization needs to be carried out by changing pi/2, the area which is larger than pi/2 is set as a base surface, and the area which is smaller than pi/2 is etched to remove the pi/2 phase depth;
c. and adjusting the etching width to ensure that the width of the etching groove is 30-100 microns, and completing the division of the girdle band of the secondary area.
3. The ophthalmic lens with a contact microstructure according to claim 1, wherein: within the range of the distribution of the sub-zones, the first dioptric zone and the second dioptric zone form a mixed zone, wherein the area of the second dioptric zone formed by the sub-zones is 20-60% of the total area of the mixed zone.
4. The ophthalmic lens with a contact microstructure according to claim 3, wherein: the area of the second refraction zone, which is composed of the sub-zones, is 30-40% of the total area of the mixing zone.
5. The ophthalmic lens with a contact microstructure according to claim 3, wherein: the secondary regions are uniformly distributed in the mixing region.
6. The ophthalmic lens with a contact microstructure according to claim 1, wherein: the eye-side surface is spherical, and the object-side surface is spherical, aspherical or progressive.
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| CN202110507447.8A CN113253481B (en) | 2021-05-10 | 2021-05-10 | Spectacle lens with invisible microstructure |
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| CN202110507447.8A CN113253481B (en) | 2021-05-10 | 2021-05-10 | Spectacle lens with invisible microstructure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1447150A (en) * | 2003-01-20 | 2003-10-08 | 杨国光 | Design and manufacturing technique of micro optical eye glass and glasses |
| US20150253586A1 (en) * | 2012-10-18 | 2015-09-10 | Essilor Int'ernational (Compagnie Generale D'optique) | Method for determining an ophthalmic lens comprising an aspherical continuous layer on one of its faces and an aspherical Fresnel layer on one of its faces |
| CN106054295A (en) * | 2016-07-18 | 2016-10-26 | 中国科学院上海光学精密机械研究所 | Fresnel-Dammann zone plate |
| US20170131567A1 (en) * | 2015-11-06 | 2017-05-11 | Hoya Lens Thailand Ltd. | Spectacle Lens |
| CN111226161A (en) * | 2018-03-01 | 2020-06-02 | 依视路国际公司 | Lens element |
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2021
- 2021-05-10 CN CN202110507447.8A patent/CN113253481B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1447150A (en) * | 2003-01-20 | 2003-10-08 | 杨国光 | Design and manufacturing technique of micro optical eye glass and glasses |
| US20150253586A1 (en) * | 2012-10-18 | 2015-09-10 | Essilor Int'ernational (Compagnie Generale D'optique) | Method for determining an ophthalmic lens comprising an aspherical continuous layer on one of its faces and an aspherical Fresnel layer on one of its faces |
| US20170131567A1 (en) * | 2015-11-06 | 2017-05-11 | Hoya Lens Thailand Ltd. | Spectacle Lens |
| CN106054295A (en) * | 2016-07-18 | 2016-10-26 | 中国科学院上海光学精密机械研究所 | Fresnel-Dammann zone plate |
| CN111226161A (en) * | 2018-03-01 | 2020-06-02 | 依视路国际公司 | Lens element |
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| CN113253481B (en) | 2022-11-15 |
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