DE102014017678A1 - Progressive lens with different intrinsic refraction - Google Patents

Abstract

The invention relates to optical lenses consisting of materials with different refractive indices within a lens. In the transition from far vision to near vision, the optical density of the lens material changes. Lens may have uniform geometric lens shape for low refractive differences between near and far, or may be additionally geometrically altered for larger far-vision differences, as is the case with conventional progressive goggles. The invention relates to progressive lenses in which the lens material within a lens has different optical densities. PRIOR ART Conventional progressive lenses have different refractive properties in the different regions near-vision region transition region far-vision region, which are produced by geometrical design of the lenses. Progressive spectacles are shaped such that there is a continuous transition from the distance to the near-vision region, but in the transition region, in particular in the case of large refraction differences between the near and far regions, one can not see the entire width of the lens sharply. Towards the lateral lens edges, the lens refraction changes in the transition region in relation to the middle region.

Description

Disadvantages of the previous progressive spectacles

In the transition region, especially in large refractive differences between near and far, not over the entire width of the lens is seen sharp. Towards the lateral lens edges, the lens refraction changes in the transition region in relation to the middle region. In the following section, an excerpt from the literature "Disadvantages of progressive lenses" is inserted, which also describes the disadvantages of the progressive lenses of the prior art.

"Disadvantages of progressive spectacles"

Most people get along spontaneously with progressive lenses, especially with the good and very good qualities. Basically, the "visual program" has to be adapted in the brain. This often requires a certain amount of time to get used to (from a few days to several weeks), during which the varifocal lenses are worn longer every day and, in the event of any inconvenience such as light dizziness, pressure or headaches, changed back to the usual glasses for the rest of the day.

The visual ranges for distance and proximity are smaller than for single glasses, but can be optimized by individualizing the progressive lenses.

Lines and planes appear distorted - here the differences between low - and high - priced progressive lenses can be seen most clearly. In the habituation phase occurs in some people the impression that the floor is curved (rocking effect)

Estimating distances may be difficult during the acclimatization phase.

In eye diseases with changing visual properties, progressive lenses are only partially suitable due to the high cost of their production.

The age limit for an initial correction with this type of glass should not exceed 65 years, because with increasing age, the addition, ie the additional strength that is added to the distance to read, increases and reduces the compatibility, because the Field of view narrows down.

Advantages of the invention

In the case of the progressive lens according to the invention, the change in the dioptric value between the near and far regions is produced by changing the refractive index of the lens material. This results in the same diopter value between near and far vision even with uniform lens geometry.

In the transition region, the continuous change in the diopter value is produced by continuously changing the optical density of the lens material. In the transition region, the refractive index remains unchanged towards the lateral edges. You can also see in the transition area up to the side glasses edges sharp without distortion.

1. Description of the invention:

• Progressive lenses with different intrinsic refractions

2. The following inventors are involved in the invention:

• Schneider, Reiner Flurstrasse 32 96237 Ebersdorf

3.1. Which technical problem should be solved by the invention?

The intention is to produce optical lenses, in particular spectacle lenses, which have different diopter values for the near-vision region than for the far-vision region.

In particular, progressive lenses are to be created that enable sharp vision without distortions over the entire visual range (near range, far range and transition range).

3.2. State of the art

By changing the lens geometry over the visual range, different diopter values are achieved.

Progressive lenses are shaped in such a way that a quasi-continuous transition arises from the far-vision area to the near-vision area. In this transition region can be seen reasonably sharp, at least on a limited width.

3.3. Disadvantages of the known solutions:

In the transition region between near and far vision, only a narrow channel is optically usable. To the side edges, the transition area is distorted and out of focus.

3.4. Object of this invention:

The complete spectacle lens should be optically perfect up to the lateral edges. Also the Transition area should be sharp and free from distortion. The disadvantages mentioned under 3.3 should be avoided.

3.5. How is this task solved?

The different dioptre values of the progressive lens are wholly or partly effected by changing the optical density of the lens material.

In most cases, the optical density will be lower for the upper part of the glass, that is to say for the far-vision region, and for the lower part, the near-vision region (reading zone), the optical density will be higher.

3.5.1. Solution variant 1

It uses a so-called preform, as it is called for the production of optical glass fibers and optical waveguide is used. Please refer EP 0104617 A2

In such preforms z. B. of quartz glass, z. B. with germanium or phosphorus a suitable refractive profile can be generated.

If you cut from such a rotationally symmetrical profile cross-section discs 2 out, so you can from these cross-section discs, the blanks for the progressive lenses 3 win. z. B. 3 lens blanks from a cross-sectional disk.

The glass obtained from this process has extremely high purity and very good transparency.

3.6. Core of the invention

The glass or the optical lens has different optical densities, and thus also with uniform lens geometry different diopter values.

3.7. Main advantages

It is a very pleasant, comfortable vision, especially in the transition area from distance to near to expect.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0104617 A2 [0018]

Claims (8)

Optical lenses in the same lens areas with different optical density and thus have different refraction. Lenses according to claim 1, wherein in addition the lens geometry is designed so that an additional variation of the refractive profile is formed. Lenses according to claim 1, in which the optical density changes continuously over the lens and thus changes steplessly from the distance vision area to the near vision area. Lenses according to claim 1 wherein the optical density changes in many stages, 10-1000 stages, so that a quasi-continuous density curve is formed. Lenses according to claim 1, wherein the lens has two opposite regions each having a uniform optical density, and a continuous transition from one to the other density occurs between these regions. Lenses according to claim 1, wherein the course of the optical density is linear, or may have different waveforms. (S. dashed line in picture 1) 1 Lenses according to claims 1 to 6, wherein the course of the optical density is different to the sides, as in the middle. This has the advantage that, especially in the transition area, if you look on the same contour line on a flat surface to the right or left to the larger distance fits a smaller refraction, and so has to the side of an automatic adjustment. See Figure 1 Compare M and A The lenses according to claim 1 to 7 may be made of glass as described in solution variant 1 or consist of plastic, for. B. PMMA with fluorine doping.

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