WO2005071465A1 - Single-vision spectacle lens and a single-vision spectacle - Google Patents

Abstract

The invention relates to a strengthening spectacle glass which is inserted into the spectacle frame of a spectacle carrier and to a pair of spectacles. The spectacle glass (26) is provided with a distance correction facility according to conditions of use of said spectacle glass (26), particularly cornea-vertex-distance (HSA) and/or pupil distance and/or local angle of view (A,B) of the spectacle carrier, and/or data of the spectacle frame, e.g. front inclination and/or lateral inclination and/or adaptation. The spectacle glass (26) has at least one area (26a, 26b, 26c) which is corrected in a variable manner according to conditions of use.

Description

 Single vision glasses and single vision glasses

The invention relates to a single-vision spectacle lens for insertion into a spectacle frame of a spectacle wearer, in which the spectacle lens with a distance correction depending on the conditions of use of the spectacle lens, in particular a corneal-vertex distance (HSA) and / or a pupil distance and / or a local viewing angle of the glasses wearer, and / or data of the glasses frame, such as a forward inclination and / or a side inclination and / or their shape.

The invention further relates to single vision glasses with at least one distance corrected lens. A single vision spectacle lens of the type mentioned is known from DE 101 22 707 AI.

In contrast to multifocal lenses or progressive lenses, single vision lenses have the same constant target effect for the spectacle wearer everywhere. To correct image errors, particularly astigmatism, and spherical deviations, it is known to "correct" single vision lenses, i.e. to minimize the image errors for a certain distance by choosing a suitable deflection / asphere in the largest possible diameter.

The single-vision lens known from DE 101 22 707 AI mentioned at the outset is corrected so that data on the spectacle wearer, for example the pupil distance and the shape of the spectacle frame, are included in the correction, as is the most frequently used object distance. However, the latter is assumed to be constant within the manufacturing process. Details of the manufacturing process and lens shape are not given.

From DE 41 07 195 AI a short and medium distance aberration-free spectacle lens for presbyopia is known. In this known spectacle lens, different radii of curvature are selected for the front surface and the rear surface, and the center points lie at a distance from one another on the optical axis. This is to ensure that there is no fluctuation in the image as a result of the movement of the eyeball. Furthermore, an eyeglass lens and eyeglass lens family is known from DE 100 20 914 AI, in which an adaptation to the conditions of use of the eyeglass wearer is carried out in a multifocal lens.

A similar spectacle lens is also described in DE 197 01 312 AI. There is a varifocal lens disclosed, which is provided on the back with a multifocal surface that meets all the individual requirements of the prescription glasses. Special solutions are also considered, e.g. on glasses for VDU work or for drivers. Such special solutions require a distance correction only for a certain distance, which consequently affects the entire spectacle lens as a special solution for only a certain application.

As already mentioned, single vision lenses of conventional design are only optimized for a certain sphere / cylinder combination and only for standard conditions of use, and the aspheres in such single vision lenses are only optimized for a certain distance, usually the distance, but not for a different distance, how to use them for reading, for. Climbing stairs and the like is required.

The invention is therefore based on the object of further developing single-vision glasses and single-vision glasses of the type mentioned at the outset in such a way that the disadvantages described are avoided. In particular, it should be possible to be able to see corrected at different distances with a single-vision spectacle lens according to the invention or with spectacles fitted with it, taking into account the conditions of use of the spectacle lens. In the case of a single-vision spectacle lens of the type mentioned at the outset, this object is achieved according to the invention in that at least one area is formed in the spectacle lens, which is corrected differently for different distances depending on the conditions of use.

In the case of single vision glasses of the type mentioned at the outset, the object is achieved in that the glasses of the glasses are corrected differently for different distances according to the individual conditions of use of the glasses wearer.

The object underlying the invention is completely achieved in this way.

According to the invention, individual single-vision spectacles are provided for a spectacle wearer, taking into account his personal conditions of use. H . Optimization is carried out individually for the sphere / cylinder combination ordered. In addition, the individual conditions of use, such as pre-inclination, side inclination, corneal-vertex distance and position of the eyes with regard to the frame of the glasses are included in the optimization. The single-vision spectacle lens according to the invention remains a single-vision lens in which, in contrast to a varifocal lens, the same constant target effect is present everywhere. A change in the working distance must therefore be applied by accommodation of the spectacle wearer, as is the case with conventional single-vision spectacle lenses. In the single vision glasses according to the invention with two such glasses, the left lens and the right lens can differ in their individual correction and target effect.

In embodiments of the spectacle lens according to the invention, the correction can be applied differently, namely once for different working distances, on the other hand depending on a forward inclination of the spectacle lens in the spectacle frame, furthermore depending on a lateral inclination of the spectacle lens in the spectacle frame, and furthermore on a distance of the spectacle lens from an eye of the spectacle wearer (the so-called corneal-vertex distance HSA), moreover depending on a position of the eyes of the spectacle wearer relative to the spectacle frame, and finally depending on a local viewing angle of the eyes of the spectacle wearer. The target effect and the working distances do not have to be related to each other.

These corrections are local changes in the curvatures. The orders of magnitude of these corrections are in the range of a few hundredths of a few tenths of a diopter, so that, as already mentioned, the single-vision spectacle lens according to the present invention is not a multi-vision or progressive lens because this minimal variation in the refractive power does not result in that the accommodation of the spectacle wearer becomes unnecessary when the working distance is varied.

The differently corrected areas of the single-vision spectacle lens provided according to the invention can be shaped differently. In a first embodiment, the areas are formed as horizontal strips in the normal position of use, in a second embodiment as concentric rings and in a third embodiment finally as irregularly shaped surfaces distributed over a surface of the spectacle lens.

This selection of the shape of the areas also depends on the individual conditions of use and the manufacturing effort acceptable in individual cases.

Conventional rotationally symmetrical aspherical spheres or hingedly symmetrical aspherical axes are not sufficient to implement the above-described corrections of the image errors. Rather, free-form surfaces (any aspheres, splines, ...) should be provided.

It is further preferred if transition zones are provided between the differently corrected regions, which produce a continuous or abrupt transition between the regions.

Further advantages result from the description and the attached drawing.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own without departing from the scope of the present invention. Embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:

1 and 2 a single-vision spectacle lens according to the prior art for two different viewing angles of an eye;

3 to 5 a representation similar to FIGS. 1 and 2, but for a single-vision spectacle lens according to the invention and three different viewing angles of an eye;

6 to 8 show three embodiments of differently corrected areas of a single-vision spectacle lens according to the invention.

In Fig. 1, 10 denotes an eye of a spectacle wearer. For the sake of simplicity, only one eye is shown in the drawing.

12 with the lens and 14 with the retina of the eye 10 is designated. In front of the eye 10 there is a conventional single-vision spectacle lens 16. The so-called corneal-vertex distance HSA is also shown in FIG. 1.

In the situation according to FIG. 1, the eye 10 looks straight ahead, i.e. that the viewing angle is zero. An image point located at infinity emits light rays 18 which are parallel to the axis and which are focused in the lens 12 and appear as a point-like image 20 on the retina 14.

FIG. 2 shows a situation in which the spectacle wearer looks down at an angle of view α and thereby fixes an image point 22 which is only at a finite distance a from the lens 12 '. Since the spectacle lens 16 is distant over its entire surface, i.e. If an operating point lying in infinity is corrected, the light rays 18 'pass as a diverging and distorted light beam from the image point 22 through the spectacle lens 16 and the lens 12' and are imaged as a blurred image 24 on the retina 14 '. Since the lens 12 'can only accommodate approximately spherically, a residual error remains.

The invention has set itself the goal of avoiding this disadvantage of conventional spectacle lenses 12, which is illustrated by way of example.

3 to 5 show a single-vision spectacle lens 26 which is divided into three areas 26a, 26b and 26c. These three areas 26a, 26b, 26c are corrected differently so that, for example, different distances can be taken into account. FIG. 3 again shows a case corresponding to FIG. 1, in which the spectacle wearer looks straight ahead with his eye 10 and fixes a working point in the distance. The light rays 18 are again incident parallel to the axis, penetrate the central region 26b of the spectacle lens 26 and will appear on the retina 14 as a point-like image 20 via the lens 12.

In the situation in FIG. 4, on the other hand, which corresponds to FIG. 2, the diverging light bundle 18 ', which starts from the image point 22 at a finite distance a from the lens 12', penetrates the lower region 26c of the spectacle lens 26, which is straight corrected for the distance a and the viewing angle α. Consequently, a point-like image 20 'on the retina 14' is also achieved here.

The corresponding case for a medium distance b is shown in FIG. 5, where the spectacle wearer looks upwards with his eye 10 ″ at a viewing angle β and fixes an image point 28 there, which is arranged at a medium distance b from the lens 12 ″ is. In this case, the diverging beam bundle 18 ″ falls through the upper region 26a of the single-vision spectacle lens 26, which has just been corrected for the distance b and for the viewing angle β. The result of this is that a point-shaped image 20 ″ is also produced here on the retina 14 ″.

6 to 8 show three embodiments or shapes for the differently corrected areas of spectacle lenses. FIG. 6 shows a configuration similar to FIGS. 3 to 5 with an eyeglass lens 30, the three regions 30a, 30b, 30c of which are arranged one above the other in the normal position of use of the eyeglass lens 30 and are designed as a horizontal strip. Between the areas 30a, 30b and 30b and 30c there is a transition zone 32, which creates a continuous transition between the adjacent areas.

As a variant, FIG. 7 shows a spectacle lens 40 with three areas 40a, 40b, 40c, which are designed as concentric rings and are each separated from one another by transition zones 42.

8 finally shows a third variant with an eyeglass lens 50, the five regions 50a, 50b, 50c and 50e of which are formed as irregularly shaped surfaces which are located within a common transition zone 52.

Claims

claims 1. single-vision spectacle lens for insertion into an eyeglass frame of a spectacle wearer, in which the spectacle lens (16; 26; 30; 40; 50) with a distance correction as a function of individual conditions of use of the spectacle lens (16; 26; 30; 40; 50), in particular a cornea-vertex distance (HSA) and / or a pupil distance and / or a local viewing angle (α, β) of the spectacle wearer, and / or data of the spectacle frame, such as, for example a forward inclination and / or a side inclination and / or its shape, characterized in that the spectacle lens (16; 26; 30; 40; 50) has at least one area (26a, 26b, 26c; 30a, 30b, 30c; 40a , 40b, 40c; 50a, 50b, 50c, 50d, 50e), which is corrected differently depending on the conditions of use for different distances (a, b, oo). 2. Single vision spectacle lens according to claim 1, characterized in that the spectacle lens (16; 26; 30; 40; 50) has a plurality of regions (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40σ; 50a, 50b , 50c, 50d, 50e), which are corrected differently for different distances depending on the conditions of use. 3. Spectacle lens according to claim 1 or 2, characterized in that the at least one area (26a, 26b, 26c; 30a, 30b, 30σ; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e) is different for different working distances is corrected. 4. Spectacle lens according to one or more of claims 1 to 3, characterized in that the at least one region (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e) is corrected as a function of a forward inclination of the spectacle lens (16; 26; 30; 40; 50) in the spectacle frame. 5. Spectacle lens according to one or more of claims 1 to 3, characterized in that the at least one region (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e) is corrected as a function of a side inclination of the spectacle lens (16; 26; 30; 40; 50) in the spectacle frame. 6. Spectacle lens according to one or more of claims 1 to 3, characterized in that the at least one region (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e) as a function of a distance (HSA) of the spectacle lens (16; 26; 30; 40; 50) from an eye (10) of the spectacle wearer is corrected. 7. Spectacle lens according to one or more of claims 1 to 3, characterized in that the at least one region (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e) is corrected as a function of a position of the eyes (10) of the spectacle wearer relative to the spectacle frame. 8. Spectacle lens according to one or more of claims 1 to 3, characterized in that the at least one region (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40σ; 50a, 50b, 50c, 50d, 50e) is corrected as a function of a local viewing angle (α, β) of the eyes (10) of the spectacle wearer. 9. spectacle lens according to one or more of claims 2 to 8, characterized in that the plurality of areas (30a, 30b, 30c) are formed as horizontal strips in the normal position of use. 10. Spectacle lens according to one or more of claims 2 to 8, characterized in that the plurality of regions (40a, 40b, 40c) are designed as concentric rings. 11. Spectacle lens according to one or more of claims 2 to 8, characterized in that the plurality of regions (50a, 50b, 50c, 50d, 50e) are designed as irregularly shaped surfaces distributed over a surface of the spectacle lens (50). 12. Spectacle lens according to one or more of claims 1 to 11, characterized in that the at least one region (26a, 26b, 26c; 30a, 30b, 30c; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e) designed as a free-form surface. 13. Spectacle lens according to one or more of claims 2 to 12, characterized in that between the several regions (30a, 30b, 30c; 40a, 40b _r 40c; 50a, 50b, 50c, 50d, 50e) transition zones (32; 42; 52) are provided which produce a continuous or abrupt transition between the regions (30a, 30b, 30c; 40a, 40b, 40c; 50a, 50b, 50c, 50d, 50e). 14. Spectacle lens according to claim 13, characterized in that the transition zones (32; 42; 52) are designed as a free-form surface. 15. Single vision glasses with at least one distance-corrected spectacle lens (16; 26; 30; 40; 50), characterized in that the spectacle lens (26; 30; 40; 50) is designed according to one or more of claims 1 to 14. 16. Single vision glasses according to claim 15, characterized in that the right and left glasses (26; 30; 40; 50) of the glasses differ in their individual correction and target effect.