WO2022118991A1

WO2022118991A1 - Customized bi-aspherical lens and manufacturing method therefor

Info

Publication number: WO2022118991A1
Application number: PCT/KR2020/017373
Authority: WO
Inventors: 진재홍
Original assignee: 한미스위스광학 주식회사; 진재홍
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2022-06-09

Abstract

The present invention relates to a method for manufacturing a customized lens according to a preform design and a bi-aspherical design of a convex surface (CC)/a concave surface (CV). The preform design is a lens design according to parameters for each individual, wherein at least one of the following parameters for each individual may be used: (1) vertex distance (CVD) that is the distance between the spectacle lens and the eye; (2) reading distance (RD) that is the distance between a book and the eyes; (3) monocular PD (MONO PD) that is the distance between the pupils; (4) axial length that is the length from the front to the back of the eyeball; (5) face form angle (FFA) that is the angle formed between the straight line drawn from the human eyebrow to the upper jaw and the horizontal line drawn from the external auditory foramen; (6) pantoscopic tilt (PT) that is the angle of the eyeglass frame that changes depending on the position of the nose and ears; (7) INSET that is the amount of convergence (the focus of the gaze lines of both eyes on one point in front of the eyes) according to the gaze distance from the distant portion to the near portion; and (8) optical center height (OH) that is the distance from the lower edge of the eyeglass frame to the pupil center in the vertical direction. The bi-aspherical design designs both myopic and astigmatic surfaces as aspherical surfaces in order to minimize distortion and reduce astigmatism and wearer maladaptation, and separately applies the addition power (diopters, Di) to the front CC and the rear CV at the near portion respectively.

Description

Personalized double-sided aspherical lens and manufacturing method thereof

The present invention relates to a double-sided aspherical lens, and more particularly, to a personalized double-sided aspherical lens utilizing individual parameters and a manufacturing method thereof.

In general, Progressive Multi-focussing/Addition Lenses (PAL), one of the lenses for correcting ametropia, refers to lenses designed to see both near and far with a single lens. It refers to spectacle lenses developed mainly to deal with the symptoms of presbyopia. Here, the symptoms of presbyopia often progress from the age of 40 as the wearer of spectacle lenses ages, and when the lens loses elasticity, the distance of focus is not smooth when looking at a distance or close, so nearby objects appear blurry or intermediate. It refers to the symptom of not being able to properly recognize objects of wealth or near use.

Recently, there is also an expression of young presbyopia after 30 years of age for symptoms of presbyopia. Modern people are exposed to a lot of devices such as TVs, computers, game consoles, and smartphones along with various social activities. The risk of developing visual dysfunction and eye disease is very high due to factors such as a high risk of presbyopia, and the symptoms of presbyopia are also coming out sooner.

In general, a progressive multifocal lens includes an area for viewing at a distance called a "far vision viewing portion", an area for viewing an intermediate distance called an "intermediate vision viewing portion", and a "near vision portion" (near vision viewing portion) There is an area for viewing near distance. Here, the intermediate distance refers to a distance of about 50 cm to 2 m, and a distance greater than that is often called a long distance and a distance closer than that is often called a short distance, but the standard is not clearly defined.

The progressive multifocal lens has different powers in the distance, intermediate, and near parts, and since the incidence of astigmatism is different depending on the power, the wearer of glasses cannot easily adapt. For example, depending on the difference in the degree of astigmatism, the field of view in the middle part and near vision part may become narrow. In the mid-distance area), they complain a lot of discomfort in their visual life.

In addition, since progressive multifocal lenses have a change in power through various curves on the lens surface, in the case of spectacle lens wearers with high myopia/strength astigmatism, which has a lot of change in the power from the distance part to the near part, the maladaptation rate is particularly high, so progressive It is a factor that sharply reduces the use rate of multifocal lenses.

On the other hand, many manufacturers are applying the lens aspherical design as a solution to the cause of misfit due to the occurrence of astigmatism, but the problem of misfit of spectacle lens wearers has not yet been completely solved.

In addition, most of the wearers of existing progressive multifocal lenses have a preconceived notion that progressive multifocal lenses are difficult and expensive, so they are highly dependent on foreign products. However, there was the inconvenience of having to accept it as it is if the manufacturer or the optician had to adapt without knowing what was inconvenient.

[Prior art literature]

Korean Patent Application No. 2011-0014309 (filed on February 18, 2011)

Accordingly, the present invention was developed to solve the above problems, and a personalized double-sided aspherical lens using individual parameters that improved the wearer's adaptation rate by applying a preform design using individual parameters and a double-sided aspherical design, and An object of the present invention is to provide a method for producing the same.

According to one aspect of the present invention for achieving the above object, there is provided a method for manufacturing a personalized lens according to a preform design and a double-sided aspherical design of CC (convex surface)/CV (concave surface), wherein the preform design is performed through individual parameters As a lens design according to variables, the individual parameters are: ① vertex distance (CVD): distance between spectacle lens and eye, ② reading distance (RD): distance between book and eye, ③ monocular PD (MONO PD): Distance between pupils, ④ axial length: the front and rear lengths of the eyeballs, ⑤ Facial angle (FFA): The angle between the straight line drawn from the human eyebrow to the upper jaw and the horizontal line drawn from the external auditory meatus, ⑥ Angle of inclination ( PT): The angle of the frame that changes according to the position of the nose and ears, ⑦ INSET: The amount of convergence (the focus of the gaze lines of both eyes on one point in front of the eyes) according to the gaze distance from the distant part to the near part, and ⑧ the optical center point Height (OH): At least one of the distance from the lower edge of the eyeglass frame to the center of the pupil in the vertical direction is used, and the double-sided aspherical design minimizes distortion and reduces astigmatism and wearer's maladaptation. A method is provided for designing all aspherical surfaces and applying the addition degree (Di, unit: diopter) to the front surface CC (convex surface) and rear surface CV (concave surface) respectively in the near part.

According to the present invention, in order to minimize the thickness of the lens, a prism thinning process may be performed so that the edge thickness of the lens is balanced by cutting and polishing a portion corresponding to the BU prism of the lens.

From the above-described characteristics, the present invention provides a preform design using individual parameters (personal characteristics or habits, etc.) and a personalized lens to which a double-sided aspherical design is applied. Thus, the wearer can be provided with the best spectacle lenses. In addition, according to the present invention, a wearer of progressive multifocal lenses having both myopia power and astigmatism power can have a more comfortable and wide field of view due to the advantage of an aspherical design in any condition, and aspheric optimization Through this, it is possible to minimize distortion even in different fields of vision in the distance/middle/near vision, so it is possible to increase the adaptation rate when wearing the lens, and even if the wearer has a frequency with a lot of astigmatism, it can be applied to the existing product. You can get a much better effect than that.

1 is a block diagram illustrating a method for manufacturing a personalized double-sided aspherical lens according to the present invention;

2 is a comparative explanatory view of a double-sided aspherical lens of the present invention and a general lens according to the method of FIG. 1;

3 is a view showing a processing step and a state before and after processing of the double-sided aspherical lens of the present invention according to the method of FIG. 1;

4 is a view for explaining a prism thinning process for minimizing the thickness in the double-sided aspherical lens of the present invention according to the method of FIG.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings and examples.

In the following description, the illustration and description are omitted except for essential parts in describing the invention, and the same reference numerals are given to the same and similar elements throughout the specification, and the detailed description thereof will be omitted without repeating.

1 is a block diagram illustrating a method of manufacturing a personalized double-sided aspherical lens according to the present invention, FIG. 2 is a comparative explanatory diagram of the double-sided aspherical lens of the present invention and a general lens according to the method of FIG. 1, and FIG. A view showing the processing step and the state before and after processing of the double-sided aspherical lens of the present invention according to the method, and FIG. 4 is a view explaining the prism thinning process for minimizing the thickness in the double-sided aspherical lens of the present invention according to the method of FIG.

In general, progressive multifocal lenses are often designed with both spherical surfaces or only one surface with aspherical surfaces. There have been many cases. This is mainly due to the fact that most of the progressive multifocal lens wearers have both myopia and astigmatism. Because they feel more astigmatism or distortion than products designed with , wearers complain of some discomfort, and even wearers who absolutely need progressive multifocal lenses avoid it.

Accordingly, the present invention provides a personalized double-sided aspherical lens manufactured by preform design utilizing individual parameters (eg, individual characteristics or habits), where the parameters for each individual include ① vertex distance (CVD) : Distance between spectacle lens and eye, ②Reading distance (RD): Distance between book and eye, ③Monocular PD (MONO PD): Distance between pupils, ④Axial length: anteroposterior length of eyeball, ⑤ Facial angle (FFA): The angle formed between the straight line drawn from the human eyebrow to the upper jaw and the horizontal line drawn from the external auditory meatus, ⑥Inclination angle (PT): The angle of the frame that changes depending on the position of the nose and ears, ⑦INSET: From the distance The amount of convergence (the concentration of the gaze lines of both eyes to one point in front of the eyes) according to the gaze distance to the near part, and ⑧ the optical center point height (OH): at least the distance from the lower edge of the eyeglass frame to the center of the pupil in the vertical direction One or more may optionally be used.

Unlike the front progressive design of general lenses, the personalized double-sided aspherical lens manufactured by freeform design using individual parameters like this applies a method of processing the rear surface into multiple curves while keeping the front curve constant (Fig. See the right figure of 2a). Through this, the difference in thickness of the distant, intermediate, and near areas is minimized, the prism phenomenon is minimized, and optical maladaptation phenomena such as astigmatism, distortion, and peripheral blurring are minimized. In addition, since individual parameters are applied from the production stage, it is possible to design so that the wearer can see the prescription at the time of prescription. In addition, since the aspherical surface optimization according to the axis is applied, it is more effective for the wearer of the oblique axis (135, 45 degrees), and it is possible to smoothly move the gaze of the distant part, the middle part, and the near part, and it provides a wider field of view. In particular, it is possible to provide an aspherical effect to both the nearsightedness/astigmatism degree wearer, and through this, the field of view is enlarged, and thus it is effective for the high myopia/astigmatism wearer and the far-sighted wearer.

In addition, the personalized double-sided aspherical lens of the present invention is characterized in that it is designed to be processed according to the change in curvature while applying air pressure from the outside in a three-dimensional point processing method using CNC equipment, and through this, elliptical error and The prism phenomenon can be minimized.

On the other hand, in the case of a general lens, an external (front) progressive design is applied. In the external progressive design, the progressive addition (ADD) power is applied to the front CC (convex) and the distant power is applied to the rear CV (concave). When applied, there is a problem in that distortion and shaking occur according to changes in the front and rear curves, and elliptical errors and prisms occur in the far/near part (see FIGS. 2A and 2B ). In addition, since the degree of addition (ADD) is large, the aberration is different for each astigmatism/axis when there is astigmatism, theft, and astigmatism. In the case of such an external progressive design, it is difficult to apply a variable according to the change of each axis, and it is difficult to reduce the occurrence of aberration.

On the other hand, the personalized double-sided aspherical lens of the present invention minimizes astigmatism compared to a general lens to which an external progressive design is applied as shown in FIGS. It provides the effect of expanding the field of vision by forming comfortable and more stable power.

In addition, the present invention applies an aspherical preform design to both sides of the progressive multifocal lens, that is, CC (convex) / CV (concave), and minimizes the thickness to raise the cosmetic aspect one step further. There is a characteristic. At this time, by designing both the near and astigmatism surfaces as aspherical surfaces, the curvature is optimized, the distortion itself is minimized, and the astigmatism is controlled to minimize the conditions of maladaptation felt by the wearer. Although there is a limit to reducing the distortion of astigmatism, it can bring a great effect to wearers with high myopia or hyperopia (see FIG. 3 ). In particular, for wearers of progressive multifocal lenses with both myopia and astigmatism or progressive multifocal lens wearers with high myopia/strength astigmatism, in the case of products with aspherical design on both sides of the lenses, almost no or minimal astigmatism or distortion is felt. Because of the benefits that are felt, it increases the adaptation rate of progressive multifocal lens wearers and provides the effect of improving the quality of daily life.

In addition, in the present invention, as a method for minimizing the thickness of the lens, a prism thinning process in which a portion corresponding to the BU prism of the lens is cut and polished to balance the edge thickness of the lens may be applied. , Before prism thinning, the difference in thickness between the lower and upper parts of the lens is large and the overall thickness is very thick, so the weight of the lens itself is heavy. Since the weight of is also lighter, it is possible to provide a more comfortable fit to the wearer (see FIG. 4 ). In fact, through prism thinning, the center of the lens is 16% thinner, the maximum edge is 34% thinner, and the weight is 17% lighter.

In this way, the double-sided aspherical design provides an extension of the field of view for myopia and astigmatism wearers, similar to watching a flat-screen TV, and also has the effect of reducing the thickness of the lens. It improves the wearing comfort and enhances the cosmetic effect.

In addition, since the double-sided aspherical design is applied as much as the range corresponding to the distance, intermediate, and near areas, it has the effect of expanding the field of view and minimizing astigmatism. The jump phenomenon caused by the change in power can be reduced and the movement of the gaze is smoothed, so the wearer's eyeglass lens adaptation rate is increased and the field of view is wider.

In addition, the personalized double-sided aspherical lens of the present invention is designed to have both myopic and aspheric surfaces as aspheric surfaces, and the addition degree (Di, unit: diopters) in the near part is set at the front CC (convex surface) and the rear surface CV (concave surface). It is characterized by being divided and applied on both sides.

Herein, the addition (Di) refers to the difference between the refractive power of near vision and the refractive power of far vision, that is, the difference in surface power between the distance power measurement position F and the near power measurement position N. According to the present invention, for example, If the addition value is +2.00 diopters, +1.00 diopters are applied to the front CC (convex surface) and +1.00 diopters are applied to the rear surface CV (concave surface). In this way, when +1.00 diopters are applied to CC (convex surface)/CV (concave surface), the wearer feels only astigmatism for +1.00 diopters. In the present invention, since it can be reduced to half that level, the wearer's maladaptation can also be reduced by half, and the field of view can be felt much wider and more comfortable. This effect can be felt more strongly at larger frequencies.

Of course, the above-described addition division in the near part may be applied differently to CC (convex surface)/CV (concave surface) depending on the condition of the glasses wearer. For example, +0.25 diopter is applied to the front CC (convex surface). In case of application, +1.75 diopter is applied to CV (concave surface) which is the rear side, and +0.25 diopter can be applied to CV (concave surface) which is rear when +1.75 diopter is applied to CC (convex surface) which is the front side. It is even possible to apply +0.00 diopters to the front CC (convex surface) and +2.00 diopters to the rear CV (concave surface).

On the other hand, when applying the double-sided aspherical design to the myopia and astigmatism parts of the progressive multifocal lens, it is preferable to apply the aspherical design to all surfaces of the distance, intermediate, and near parts. It is possible to minimize distortion even in the different fields of vision in the middle/near part, so that it is possible to increase the adaptation rate when wearing the lens.

In addition, according to the present invention, wearers of progressive multifocal lenses having both myopia power and astigmatism power can have a more comfortable and wide field of view due to the advantage of an aspherical design under any conditions, even though a lot of astigmatism occurs Even a wearer with a high frequency can get a much better effect than the existing product.

As described above, the personalized double-sided aspherical lens of the present invention has a free-form design utilizing individual parameters (features/habits), a double-sided aspherical design of CC (convex)/CV (concave), and minimal thickness of a progressive multifocal lens It can be provided by designing and applying the addition degree (Di, unit: diopter) to the front side CC (convex surface) and the rear surface CV (concave surface) in the near part.

In addition, the present invention provides a personalized lens to which a preform design using individual parameters and a double-sided aspherical design are applied, to which the following three types of manufacturing methods can be selectively applied.

The first method is to design the CC (convex surface), which is the front surface of the blank semi-finished product, as an aspherical surface, and apply an aspherical design to the rear surface of the lens using a preform processing method to apply a double-sided aspherical design to both surfaces.

The second method is to apply a double-sided aspherical design in which both sides of the front side CC (convex side) / rear side CV (concave side) are made as aspherical to the blank product (semi-finished product).

The third method is to apply a double-sided aspherical design in which both sides of the front side CC (convex side) / rear side CV (concave side) are made as aspherical to the blank product (finished product).

The present invention provides a general progressive multifocal design lens, an anti-pertig type progressive multifocal design lens for patients with early presbyopia, a progressive multifocal design lens for indoor/office design, and a kids-type progressive multifocal design effective for alleviating myopia progression. Double-sided aspherical design can be applied to various products such as lenses and single versions, so you can expect many effects, from expanding the wearer's field of vision and minimizing astigmatism, to reducing the weight of spectacle lenses due to thickness reduction and cosmetic effects. have.

In particular, in the present invention, by applying the aspherical design to the positions of the distant, intermediate, and near-use parts, the movement of the gaze is smooth and a more comfortable view can be provided. In addition, by applying the aspherical design (double-sided aspherical design) to both sides corresponding to CC (convex)/CV (concave), the optimal aspherical design can be applied to both the wearer with myopia/astigmatism or farsightedness.

Although various embodiments of the present invention have been described above, the contents described so far are merely illustrative of some of the preferred embodiments of the present invention, and except as may appear in the claims appended below It is not limited by the above-mentioned content. Accordingly, the present invention understands that many changes, modifications and substitutions of equivalents can be made without departing from the spirit and spirit of the invention within the scope set forth in the claims below by those of ordinary skill in the art. will have to

Claims

A method for manufacturing a personalized spectacle lens according to a freeform design and a double-sided aspherical design of CC (convex)/CV (concave), comprising:

The freeform design is a lens design according to individual parameters, and the individual parameters are ① vertex distance (CVD): distance between spectacle lens and eye, ② reading distance (RD): distance between book and eye, ③ Monocular PD (MONO PD): distance between pupils, ④ axial length: anterior and posterior length of the eyeball, ⑤ facial angle (FFA): a straight line drawn from the human eyebrow to the upper jaw and a horizontal line drawn from the external auditory canal The angle between the liver, ⑥Inclination angle (PT): The angle of the frame that changes depending on the position of the nose and ears, ⑦INSET: Convergence according to the gaze distance from the distant part to the near part (the focus of the gaze lines of both eyes to a point in front of the eyes ) amount, and ⑧ Optical center point height (OH): at least one of the distance from the lower edge of the eyeglass frame to the center of the pupil in the vertical direction is used, and the double-sided aspherical design minimizes distortion and reduces astigmatism and wearer's misfit In order to achieve this, both the myopic and astigmatism surfaces are designed as aspherical surfaces, and the addition degree (Di, unit: diopters) is divided and applied to the front CC (convex surface) and rear surface CV (concave surface) respectively. A method for manufacturing personalized double-sided aspherical lenses.
The method of claim 1,

A method for manufacturing a personalized double-sided aspherical lens in which prism thinning is performed so that the edge thickness of the lens is balanced by cutting and polishing the portion corresponding to the basal upper (BU) prism of the lens in order to minimize the thickness of the lens.
A personalized double-sided aspherical lens manufactured by the method of claim 1 or 2.