WO2009150265A1

WO2009150265A1 - Double-sided progressive lens

Info

Publication number: WO2009150265A1
Application number: PCT/ES2009/000240
Authority: WO
Inventors: Reyes LÓPEZ HERNÁNDEZ
Original assignee: Lopez Hernandez Reyes
Priority date: 2008-06-13
Filing date: 2009-05-06
Publication date: 2009-12-17

Abstract

A double-sided progressive lens that can substantially improve near vision and intermediate vision as well as viewing width. To do so, the lens according to the invention has a progressive grind on one of its sides, and a conical torus grind on the other side, identical to that of the previous side, onto which it is superposed in radius and axis. The increase in intermediate distance or progression and the increase in near width is achieved by the grinding of a progressive flattening in the lens meridian, on the same axis.

Description

"PROGRESSIVE LEHTE DE DOS GARAS"

DESCRIPTION

Object of the Invention

The present invention relates to a two-sided progressive lens that provides essential novelty characteristics and notable advantages over the means known and used in the state. Current technique for the same purposes.

More particularly, the invention proposes the development of a progressive action lens conceived in accordance with. a configuration and design that allow eliiαina3r to completely aberrate _/ while improving near vision and progressive vision width- The lens proposed by the invention is carved so that on one side a conventional development follows, while than in the another face is carved so that the widths are widened, both at medium distance or zone of progression and at close range, and the bull for the elimination of the aberrations of the other face, both sides being complementary.

The scope of the invention is within the sector dedicated to the manufacture of. contact lenses and optical material, especially lenses of the type known as "progressive."

Background and Summary of the Invention

When the eye tries to see objects that are within limits of proximity to it, it is necessary to put in place the mechanism known as "accommodation."

This fact consists in the performance of the ciliary muscles to vary the thickness of the lens of the eye to effects of increasing the potency thereof, and allowing an image of a near point to be formed in the retina and can be seen clearly.

As a consequence of the changes that occur as the age progresses / the ciliary muscles lose tone, becoming less potent, while the lens becomes less flexible, which translates into a decrease in the ability to accommodate and both of the ability to see closely. This optical condition in which due to the changes produced by age, there is an irreversible decrease in the power of accommodation, is known as presbyopia. It is therefore a physiological condition, not pathological, which begins to manifest normally when the age of 40-45 years is exceeded.

The solution to correct this problem is the use of appropriate glasses. Various types of glasses have been used, such as half-moon glasses, conventional glasses with near graduation, bifocals, progressive glasses or even contact lenses. The progressive glasses are a good solution so that the affected can achieve the desired accommodation when it comes to seeing closely, because due to their own conception, they not only allow us to see closely, but also achieve a clear vision at any distance by varying simply the position of the user's head or eyes, just look at the top of the lens to see from afar, and from below to see closely, varying the graduation between means and thus allowing distance viewing intermediate; progressive lenses are therefore the closest solution to what was the natural vision before the problem of presbyopia. But nevertheless, Although they are currently the most comfortable and best achieved solution, they are not therefore exempt from other inconveniences, such as a somewhat vague side view, and are also affected by optical aberrations that would be desirable to eliminate.

Progressive lenses are characterized by having three optimally useful areas; the area destined for far vision (VL), located in the upper part of the lens and corresponding its power to the prescription of the subject, the area destined for near vision (VC), located in the lower part of the lens and its power corresponding to the power necessary to counteract the effect of presbyopia, and the zone that communicates both previous zones, called a progressive corridor or corridor (VI), in which the power varies continuously by linking the powers of both zones. Progressive lenses are lenses carved so that the separations are invisible, and are generally characterized by stabilized powers in both VL and VC.

Over the years, two different construction principles have basically been followed in the development of progressive lenses. In one of the principles, the progression zone, the surface refraction value only rises from the value in the far part to the value in the near part, is selected as long as possible, to obtain a comparatively progressive increase reduced, which facilitates the correction of the image error in the lateral regions. German Patent Document No. DE-1145820 describes surfaces based on this principle.

As for the other construction principle, it is based on the use of a spherical part for the area of - i -

far and a spherical part for the near zone, and it is about joining them by means of a transition zone, a. be possible exempt from aberrations.

As background of the present invention related to other inventions related to progressive lenses, it is worth mentioning US Patent 2005146682 which discloses a lens that has two active faces: one on the side of the eyeball, and the other located on the opposite or objective side, consisting of a composite surface formed by an initial progressive refractive surface, adjusted to incorporate a characteristic, specific vision correction, and an initial toric surface, adjusted to incorporate an astigmatism correction characteristic.

It is also worth mentioning Japanese Patent JP 53036251 which describes the manufacturing process of one. progressive focal lens, which has an astigmatism correction function according to which respective portions of lens adhere to each other, which have progressive focal lens and single focus lens functions, the first being made of a material organic, and presenting the second of them an toric face with a unique focus.

For its part, Patent ES-2112182 describes a progressive multifocal ophthalmic lens in which the width of the near vision zone varies depending on the power increase of the lens, as well as depending on the value of the base or value. of the median sphere at a certain point in the far vision area.

In US Patent 3711191 a progressive ophthalmic lens is described, one of whose two surfaces Refractive is a spherical or toric surface, and whose other refractive surface determines, with the first refractive surface, a portion of the far vision lens with a corrected focal power for the aberrations that are specific to the far vision, a portion of the vision lens near, with a second higher focal power, corrected for specific aberrations of near vision and, among them, a portion of intermediate vision lens, with a focal power that progressively varies from said first focal power to said second higher focal power, said portion of intermediate vision also being corrected with respect to the aberrations proper to the vision of an approaching object.

Taking into account the aforementioned drawbacks, the present invention has proposed as its main objective the design and development of a progressive lens with which effective solutions to the problems posed are provided. This objective has been achieved by means of the progressive two-sided lens that will be described in the following, whose main characteristics are included in the characterizing portion of claim 1 that follows.

In accordance with the invention, the proposed lens allows, as stated above, to achieve advantageous and favorable effects that include the total elimination of aberrations, and the improvement of both near vision and average vision as well as the width of view. These objectives have been achieved thanks to the advantageous design with which both faces have been carved, so that, on one side, the carving of the progressive lens is carried out according to the conventional manner, and by the other side the carving is directed to achieve an extension of the widths, both of medium distance or zone of progression and of near, in which the bull is realized so that the aberrations of the other face are eliminated.

Brief Description of the Drawings

These and other features and advantages of the invention will become more clearly apparent from the detailed description that is made, only by way of illustrative example and without limitation, of a preferred embodiment of the object of the invention, taken together with the accompanying drawings, in which:

Figure 1 shows two schematic views (a, b), in front elevation, representative of the three viewing areas of the lens conceived according to the invention, and

Figure 2 shows a schematic view of the resulting power map and obtained by the design d.e Tiente conceived in accordance with this invention.

Description of a Preferred Embodiment

As mentioned above, the detailed description of the preferred embodiment of the invention will be carried out in the following with the help of the attached drawings, through which the same are used numerical references to designate the same or similar parts. Thus, according to Figure 1 of the drawings, two schematic views can be seen, in front elevation, of a progressive lens designed so as to achieve the objectives of aberration elimination and vision improvement noted above.

According to said Figure 1, the areas of distant, close and progressive vision of the lens on both sides are appreciated. The configuration of this lens is obtained by carving on one of the faces a conventional progressive lens, while on the other side the widening of the widths of the progressive and ole areas is carved, as well as the bull that achieves the elimination of aberrations on the other side Figure 2, meanwhile, reflects the lens power map.

The elimination of lateral and nasal aberrations is achieved by carving a conical bull at two; parts of the lens, of the same characteristics as those of the bull of the anterior face. By superimposing this on both radius and axis, the desired elimination of aberrations is achieved. It is possible to extend the width of the face by matching the bull with the line of extension of the progressive and close areas, all thanks to the inclination that the bull has been endowed.

The extension of the middle or progressive distance is achieved by carving a progressive flattening in the meridian of the lens to the same axis of the bull that eliminates the aberrations, being able to achieve, for example, that the width of the outer face passes from 2 mm to the 20 mm inner face, the flattening being variable in this area. Therefore, the medium distance zone has a variable width and height, to avoid astigmatisms and aberrations by virtue of the incorporated toric section.

On the other hand, the widening of the near width is achieved very similar to the average distance, since It is a continuity of it. As an example, the case in which the outer face has a width of 14 πe is cited, and is flattened on the inner face in the corresponding meridian with respect to the axis of the bull, turned 90 ° is a crossed cylinder and becomes a sphere having separated 6 mm on each side of the 14 rom that has the outer face. Considering the enlargement of the bull given by 7 mm on each side, the following result would be obtained: 14 mm (outer face) + 7 mm + 7 mm = 28 mm + decrease The variable inner face.

The size of the near vision zone may be chosen as appropriate, being completely free of astigmatisms and aberrations.

It should be mentioned that all the extension zones can be increased more simply by giving them more prism, always depending on the needs and demands of the users.

With the development of this two-sided lens, that is, with the combination of both, the total elimination of aberrations is achieved, and the improvement of near vision and progressive vision width with a width of 28 mm and 20 mm, respectively.

It is not considered necessary to make the content of this description more extensive so that a person skilled in the art can understand its scope and the advantages that come from it, as well as carry out the practical realization of its object.

Notwithstanding the foregoing, and since the description made corresponds only to a form of preferred embodiment, it will be understood that within its essentiality, multiple variations of detail may be introduced, also protected, which may affect formal and / or dimensional characteristics, or the manufacturing materials of the assembly or its parts, without thereby departing from the scope of the invention.

Claims

1.- Two-sided progressive lens, which has a conventional type carved lens carved on one of its faces, characterized in that a conical bull with the same characteristics is carved on the other side. that the bull of the anterior face, such that superimposed on radius and axis, provides a lens completely free of lateral and nasal aberrations.

2, - Two-sided progressive lens according to claim 1, characterized in that it has a progressive flattening carved in the meridian of the lens to the same axis, thereby providing a lens that shows both the extension of the average distance or progression, and The widening of fence width.