EP1676168A1

EP1676168A1 - Individual spectacle glass

Info

Publication number: EP1676168A1
Application number: EP04790775A
Authority: EP
Inventors: Gregor Esser; Helmut Altheimer; Norbert Awrath; Jochen Brosig; Walter Haimerl; Winfried Nikolaus; Kerstin Schmid; Edda Wehner; Andrea Welk; Martin Zimmermann
Original assignee: Rodenstock GmbH
Current assignee: Rodenstock GmbH
Priority date: 2003-10-23
Filing date: 2004-10-22
Publication date: 2006-07-05
Also published as: JP2007509373A; WO2005040893A1; DE10349721A1; US20070279587A1; JP4668201B2; US7673990B2

Abstract

The invention relates to an individual spectacle glass comprising a long-sighted vision area for long-sight distances, in particular infinitely distant regions, a short sighted vision area for short-sight distances, in particular reading distances and a progression area which is situated between the long-sighted and short-sighted areas and in which the spectacle glass effect increases the value of a long-sight reference point which is called a long-sight vision value and located in the long-sighted vision area to the value of a short-sight reference point which is called a short-sight vision value and located in the short-sighted vision area along a spiral curve towards a nose called a main line. A vertical distance between the short-sight reference point and the long-sight reference point is equal to or less than 18 mm. The progression length is equal to or less than 14 mm. The length progression length is equal or less than 10 mm. The increase of the power of a lens produced by the action of the spectacle glass on the long-sight reference point to a point situated 2 mm below a centring point is less by 10 % of the addition and the progressive length substentially corresponds to the vertical distance between the long-sight reference point and a point substentially situated on the main line. Starting from the long-sight reference point, the effect value of the spectacle glass for the first time substentially corresponds to the short-sight value. The use of the inventive spectacle glass is also disclosed.

Description

"Individual glasses"

description

The invention relates to an individual spectacle lens and the use of an individual spectacle lens.

Progressive glasses with a short progression are trendy. The smaller, more fashionable frames prompt many manufacturers to offer progressive lenses with a shorter progression length. Extensive attempts at wearing have also shown that spectacle wearers find it more pleasant if they do not have to lower their eyes so much when doing "close-up tasks", for example when reading a book. Lowering the head slightly, for example when doing computer work, is usually more ergonomically pleasant felt.

A glass with a short progression can be expected to have approximately the same effect in the centering point or in the distant reference point as the

Ametropia is corrected and that it is necessary for the "near vision tasks"

Effect clearly achieved within the rim of the frame. Neither the far range nor the close range should be intersected by the frame, but both

Areas should be within the frame.

For this it is important that the distance from the far reference point to the near reference point is as small as possible.

The specification of the vertical distance from stamp points, e.g. between distance and near reference point or between centering cross or centering point and

Near reference point is one for the characterization of the progression length Progressive lenses are not sufficient.

In the sense of this invention, the centering point is understood to mean in particular the point which should preferably coincide with the fitting point. If there is no prescribed prism or thickness reduction prism or if such prisms have been neutralized, the prism reference point coincides with the optical center. The centering cross is preferably at a position with the coordinates x approximately equal to 0 mm and y equal to approximately 4 mm. In particular, the term centering point means the point as defined in DIN EN ISO 13666: 1998. Furthermore, in the sense of this invention, the term centering cross can also be used instead of the term centering point.

For the purposes of the invention, the fitting point is in particular the point on the front surface of a spectacle lens or semi-finished spectacle lens product which, according to the manufacturer, is to serve as a reference point for the positioning of the spectacle lens in front of the eye. The fitting point is defined in accordance with EN ISO 13666: 1998.

In the context of the invention, the term “addition” means the difference between the vertex power of the near part and the vertex power of the far part, in particular measured using defined methods. The addition is defined in accordance with EN ISO 13666: 1998.

Furthermore, for further clarification of conventional technical terms as used in this patent application, reference is made to the relevant standards, in particular DIN EN ISO 19666: 1998.

The progression length should be very short according to the following definition: The length of the progression zone, ie the progression length, corresponds to the difference of the vertical coordinates of two points, whereby an upper point is the point on or immediately next to the main line on which the effect is approximately with which the ametropia is corrected in the distance (e.g. the distance reference point), and the other, lower point is the point on or immediately next to the main line of sight at which the close-up effect required by the prescription is achieved for the first time when the gaze is lowered. As a rule, this point is not the near reference point. Rather, this point will be arranged on or immediately next to the main line in the direction of the remote reference point away from the near reference point.

This definition provides a measure of the length of the progression which is independent of arbitrary stamp images and which takes into account the use situation in which the spectacle wearer uses the spectacles.

In addition, it is extremely important that the change in refractive index is achieved in the shortest possible way. This means that the refractive index does not change between the far reference point and the centering cross and the near value is also reached just above the near reference point.

For this purpose, a so-called main progression length can be defined, as has already been defined in the patent specification EP 0 911672. This is defined from the quotient from the addition and the maximum gradient of the refractive index along the main line.

The construction of a progressive lens with a short progression zone has some problems. The trend is: the shorter the progression zone with the same addition achieved, the narrower it is.

This larger central astigmatism gradient is accompanied by an increased maximum astigmatism in the periphery, which reduces the optical quality there. If one now has to accept a deterioration in the imaging properties due to greater astigmatism, one can at least make the course of the refractive index particularly tolerable. With progressive lenses, for example, the effect in the apex measurement position or in the use position is achieved in the far reference point. In the former case, the glass in the position of use usually has a slightly different effect from the recipe.

Individual spectacle lenses have already been described in the applicant's various patent applications. A progressive lens with a short progression length has also already been described by the applicant in a patent application, however, the difficulties in combining the requirement of an individual spectacle lens with a short progression length increase because the progressive surface also carries the astigmatic effect and all other individual parameters got to. The astigmatism distribution of such an area differs considerably from a normal progressive area, as shown in FIGS. 1 and 2.

The object of this invention is therefore to provide an individual spectacle lens which has a short progression zone and which takes into account all individual parameters despite this requirement.

This object is achieved by the individual spectacle lens according to claim 1 and the use of an individual spectacle lens according to claim 5.

According to the present invention, an individual spectacle lens is provided, with - an area designed for looking into greater distances and in particular into the infinite, hereinafter referred to as the far part, an area designed for looking into shorter distances and in particular reading distances, hereinafter referred to as the near part, and one between Distance and near part arranged progression zone, in which the effect of the glasses from the value in the distant part located in the distant reference point, hereinafter called the remote value, to the value of the near reference point, hereinafter called the near value, along one to Nose-winding curve, hereinafter referred to as the main line, increases, whereby the vertical distance from the near to the far reference point is at most 18 mm, the progression length is at most 14 mm, the main progression length is at most 10 mm and - the refractive index increase, based on the effect of the glasses at the distant reference point, until to a point 2 mm below the centering point is less than 10% of the addition and the length of the progression essentially corresponds to the vertical distance between the long-distance reference point and a point essentially on the main line, for which, starting from the long-distance reference point, the value of the effect of the spectacle lens is for the first time essentially corresponds to the value of the effect of the spectacle lens at the near reference point, ie the near value. In other words, the progression length is essentially the vertical distance between the long-distance reference point and a point essentially on the main line at which, starting from the long-distance reference point, the value of the effect of the spectacle lens for the first time essentially the value at the long-distance reference point plus corresponds to the addition.

Preferably, the progression zone is a short progression zone, i.e. around a progression zone with a progression length of preferably about 14 mm.

Because of the short progression length, the spectacle lenses according to the invention can advantageously also be used in fashionable frames.

For the purposes of the present invention, the vertical distance between two points means the difference in the vertical coordinates, i.e. the y coordinates, the two points.

Furthermore, a reading distance is preferably a distance of an object from the spectacle lens between preferably about 15 cm to about 70 cm, particularly preferably between about 20 cm and about 50 cm. It is further preferred that

- the location of the minimal astigmatism is not on the main line, but in the periphery, either nasally or temporally, - the astigmatism on the main line is more than 0.5 dpt and

- The astigmatism with respect to the main line is distributed completely asymmetrically.

The maximum of astigmatism can even be on the main line.

It is further preferred that

- the surface astigmatism along the main line everywhere more than 0.5 D,

- the vertical distance from close to the long-distance reference point is a maximum of 14 mm,

- the progression length at most 12 mm,

- the main progression length is at most 8 mm, - the refractive index increase 3 mm below the centering cross is less than 10% of the addition,

the addition is reached 2 mm above the near reference point and then the refractive index is stable at least over a length of preferably about 3 mm, particularly preferably about 4 mm, i.e. is almost constant. Stable or almost constant in the sense of the invention means that the refractive index change along the main line over a vertical distance of preferably about 3 mm, more preferably about 4 mm less than preferably about 0.2 dpt, particularly preferably less than about 0.1 dpt is. The refractive index preferably changes over a vertical distance of preferably about 3 mm, particularly preferably about 4 mm, preferably by less than about 10%, more preferably by less than about 5%, particularly preferably by less than about 3%.

Furthermore, the present invention encompasses the use of an individual spectacle lens for correcting an optical visual defect of a user, comprising - an area designed for looking into greater distances and in particular into infinity, hereinafter referred to as the far part, one for looking into shorter distances and in particular reading Distance designed area, hereinafter called the near part, and a short progression zone arranged between the far part and the near part, in which the effect of the spectacle lens from the value in the distant reference point located in the far part, hereinafter called the remote value, to the value of the near reference point located in the near part, hereinafter called the near value , along a curve winding towards the nose, hereinafter referred to as the main line, with the vertical distance from the near to the far reference point being at most 18 mm, the progression length at most 14 mm, the main progression length at most 10 mm and - the refractive index increase based on the effect of the spectacle lens at the distance reference point, up to a point 2 mm below the centering point, is less than 10% of the addition and

the length of the progression essentially corresponds to the vertical distance between the distance reference point and a point essentially on the main line at which, starting from the distance reference point, the value of the effect of the spectacle lens for the first time essentially corresponds to the value of the effect of the spectacle lens at the near reference point, i.e. the near value. In other words, the progression length is essentially the vertical distance between the long-distance reference point and a point essentially on the main line at which, starting from the long-distance reference point, the value of the effect of the spectacle lens for the first time essentially the value at the long-distance reference point plus corresponds to the addition.

In all embodiments, the area with the increase in activity is the area on the eye side.

The invention is described below by way of example without limitation of the general inventive concept on the basis of exemplary embodiments with reference to the drawings, to which reference is expressly made with regard to the disclosure of all details according to the invention not explained in more detail in the text. Show it: 1 shows the surface astigmatism according to the prior art;

2 shows the surface astigmatism according to the invention;

3 shows the increase in the average refractive index starting from the distance reference point according to the prior art;

4 shows the increase in the average refractive index starting from the distance reference point according to the invention;

5 to 9 show exemplary embodiments of spectacle lenses according to the invention in which the astigmatism is asymmetrically distributed with respect to the main line;

10 shows the refractive index and the astigmatism along the main line in an exemplary embodiment according to the invention.

As can be seen in FIG. 1, there is a large long-range, progression and near range in that the astigmatism is less than 0.5 dpt. There are even larger areas where the astigmatism is less than 0.25 D.

Such areas can no longer be found in spectacle lenses according to the invention (FIG. 2). The astigmatism along the main line is clearly more than 0.5 D everywhere. Only in the periphery, where the maximum of astigmatism normally lies, does the spectacle lens according to the invention have the smallest astigmatism (below 0.25 D).

FIGS. 3 and 4 show the increase in the average refractive index starting from the distance reference point. In the prior art (FIG. 3), the distance from the distance point to the near reference point is 22 mm. In the invention (FIG. 4) it is only another 14 mm. The progression length in the prior art is 22 mm, while in the invention it is only 12 mm. In the prior art, the refractive index has already reached a refractive index increase of 0.25 dpt 1 mm below the centering cross, which is located at the position x equal to 0 mm, y equal to 4 mm, whereas in the invention this only increased 4 mm below the centering cross the case is. The full short-range effect of 2.0 dpt is only achieved at the level of the near reference point in the prior art, while this is already 3 mm above in the case of the invention. The main progression length is 13 mm in the prior art and only 7 mm in the invention.

FIGS. 5 to 9 show further exemplary embodiments of the spectacle lens according to the invention in which the astigmatism is asymmetrically distributed with respect to the main line, and FIG. 10 shows the refractive index and the astigmatism of more than 0.5 d along the main line of a spectacle lens according to the invention. It can further be seen from FIG. 10 that the refractive index varies along the main line, for example in the range from y approximately equal to -30 mm to y approximately equal to -5 mm, between approximately -2.7 dpt and approximately -3.1 dpt, i.e. a maximum change in refractive index of about 0.4 dpt over a vertical extension of about 25 mm. In other words, the refractive index is essentially stable over a vertical range of about 25 mm, i.e. essentially constant.

In particular, the present invention comprises an individual spectacle lens with an area (far part) designed for looking into greater distances and in particular “to infinity”, - an area (near part) designed for looking into shorter distances and in particular “reading distances”, and an area between The long and short parts have a short progression zone in which the effect of the glasses increases from the value in the far reference point in the far part to the value of the near reference point in the near part along a curve (main line) towards the nose, the vertical distance from near to Distance reference point at most 18 mm, the progression length at most 14 mm, the main progression length is at most 10 mm and the increase in refractive index up to a point 2 mm below the centering cross is less than 10% of the addition.

Claims

Expectations

1.Individual spectacle lens with an area designed to look at greater distances and in particular to infinity, hereinafter referred to as the far part, - an area designed to look at shorter distances and in particular reading distances, hereinafter referred to as the near part, and a progression zone arranged between the far part and the near part, in which the effect of the spectacle lens increases from the value in the long-distance reference point, hereinafter called the remote value, to the value of the near reference point, hereinafter called the near value, along a curve winding towards the nose, hereinafter referred to as the main line, the vertical Distance from the near to the far reference point is at most 18 mm, the progression length is at most 14 mm, - the main progression length is at most 10 mm and the refractive index increase, based on the effect of the glasses at the far reference point, to a point 2 mm below the centering point, less than 10% of the Addition concerning and the length of the progression essentially corresponds to the vertical distance between the long-distance reference point and a point essentially on the main line at which, starting from the long-distance reference point, the value of the effect of the spectacle lens for the first time essentially corresponds to the near value.

2. Individual spectacle lens according to claim 1, wherein the location of minimal astigmatism is not on the main line, but in the Periphery, either nasal or temporal, the astigmatism on the main line is more than 0.5 dpt and the astigmatism with respect to the main line is distributed completely asymmetrically.

3. Individual spectacle lens according to one of the preceding claims, wherein the surface astigmatism along the main line everywhere more than 0.5 dpt, the vertical distance from the near to the distant reference point at most 14 mm, the progression length at most 12 mm, the main progression length at most 8 mm, - The refractive index increase 3 mm below the centering point is less than 10% of the addition, the addition is achieved 2 mm above the near reference point and then the refractive index is stable over a length of at least 4 mm, ie is almost constant.

4. Individual spectacle lens according to one of the preceding claims, wherein the area with the increase in effectiveness is the eye-side area.

5.Use of an individual spectacle lens for correcting an optical visual defect of a user, comprising an area designed to look at greater distances and in particular to infinity, hereinafter referred to as the far part, an area designed to look at shorter distances and in particular reading distances, hereinafter referred to as the near part, and a short progression zone arranged between the distant part and the near part, in which the effect of the spectacle lens from the value in the distant reference point located in the distant part, hereinafter referred to as the remote value, to the value of the near reference point located in the near part, hereinafter referred to as the near value, along a winding path towards the nose Curve, hereinafter referred to as the main line, increases, the vertical distance from the near to the far reference point being at most 18 mm, the progression length at most 14 mm, the main progression length at most 10 mm and the increase in refractive index, based on the effect of the spectacle lens at the distance reference point, up to a point 2 mm below the centering point is less than 10% of the addition and

the length of progression essentially corresponds to the vertical distance between the long-distance reference point and a point essentially on the main line at which, starting from the long-distance reference point, the value of the effect of the spectacle lens for the first time essentially corresponds to the near value.