ES2798160A1 - Progressive vision lens (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Progressive vision lens that presents a near vision zone, a progressive zone and a far vision zone characterized in that the near vision zone is defined by an elliptical region, surrounded by the progressive zone which is surrounded by the far vision zone such that the center of the near vision zone and the center of the lens are at a predetermined distance. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

Progressive vision lens

Technical field

The present invention refers to a progressive vision lens that has a near vision zone, a progressive zone and a far vision zone.

The field of application of the present invention is that of optics and ophthalmology and, more specifically, that of the manufacture of progressive vision lenses.

State of the Prior Art

In the optical sector, and very especially in relation to the refractive defect consisting of presbyopia, the use of progressive vision lenses by the person affected by said defect is very common for its correction.

Presbyopia affects the patient's near field of vision in such a way that it does not visualize nearby objects correctly, being evidenced mainly through certain difficulties in reading.

The progressive vision lenses known in the state of the art have a near vision zone, a progressive zone and a distance vision zone.

Through the near vision zone of the lens, the patient's refractive defect is compensated, adapting according to the necessary graduation for it.

This near vision zone is located in the lower part of the lens in such a way that when the user looks down to observe an object or read a document, he or she visualizes said object or document through this area, correcting its refractive defect and viewing it correctly. .

The progressive zone of the lens is a transition zone between the near vision zone and the distance vision zone.

Refractive errors such as myopia, for example, are compensated through the distance vision area, in the event that the patient also suffers from such defects together with presbyopia.

Specifically, the distance vision zone allows the patient to be able to visualize objects correctly when said patient keeps his gaze straight ahead or upward.

The problem that exists with the progressive vision lenses of the state of the art is that both the near and far vision zones and the progressive zone are very small in size in such a way that some zones are generated on the sides of the lenses. marginal areas that end up being large, through which it is not possible to correctly visualize the objects neither close nor far by the patients, to the point that aberrations are generated.

A common progressive vision lens in the state of the art is the one that appears in Fig. 1 of patent application WO 2009 / 150265A1 of the same owner as that of the present patent application, which coincides with Fig. 1 of the present application.

In this sense, through this Fig. 1, it can be clearly observed that the near and far vision zone as well as the progressive zone are reduced, defining some marginal zones of almost identical dimensions as the totality of the previous ones and not allow a correct visualization by the patient.

In short, the progressive vision lenses of the state of the art end up wasting the field of vision of the entire lens.

Therefore, it is more than necessary to define progressive vision lenses in which the marginal areas or areas in which aberrations can be visualized are greatly reduced and which at the same time are easy to manufacture and assemble. Likewise, these progressive lenses must be easily modifiable to the ocular conditions of each patient with the consequent adaptation of the corresponding plane of vision.

Explanation of the invention

The present invention aims to provide a solution to all the drawbacks mentioned above.

For this, the present invention is based on a progressive vision lens that comprises a near vision zone, a progressive zone and a far vision zone.

The near vision zone is defined by an elliptical region.

As mentioned above, said near vision zone is recorded with the necessary graduation to compensate for the patient's refractive error.

For the recording of the graduation in the area of near vision, a diffraction radius of the lens is used, preferably constant in said area, capable of compensating for the refractive error of the patient.

The progressive zone surrounds the near vision zone.

Said progressive vision zone defines a transition region between the near vision zone and the far vision zone.

In the progressive zone, different diffraction radii of the lens are gradually used to make a transition from the graduation from the near vision zone to the far vision zone in a gradual and smooth way, without causing discomfort to the patient.

The far vision zone surrounds the progressive zone and consequently also the near vision zone.

As mentioned above, said far vision zone can be recorded with the necessary graduation to compensate for refractive errors of the patient, in the event that said patient also suffers from said defects together with presbyopia.

In the event that the area of far vision must be recorded with a graduation to correct a refractive error of the patient, a diffraction radius of the lens would be used, preferably constant in said area, capable of compensating for such a refractive error.

It should be noted that, whether or not the far vision zone is to be recorded with a graduation, the progressive zone makes a gradual transition from the diffraction radius used for the near vision zone to the diffraction radius. for the far vision zone, gradually using different diffraction radii along said progressive zone in such a way that in the regions of the progressive zone closest to the near vision zone diffraction radii of similar length are available that used for the near vision zone and that in the regions of the progressive zone closest to the far vision zone there are diffraction radii of similar length to that used for the far vision zone.

Also, the center of the near vision area and the center of the lens are at a predefined distance.

The predefined distance between the center of the near vision zone and the center of the lens is established according to the morphology of the patient's eye, as well as its graduation, through methods and systems well known in the state of the art.

This means that, by the center of the lens, both the physical center and the optical center of the lens can be understood depending on the method or system used to establish the predefined distance.

The progressive vision lens according to the invention makes it possible to reduce, to the point of disappearing, the marginal areas or areas in which aberrations can be visualized.

Likewise, due to the configuration of each of the different areas of near vision, progressive and far vision of the progressive lens, it allows a simple manufacture and quick assembly.

In a preferred embodiment of the progressive vision lens according to the invention, the major axis and the minor axis of the elliptical region defining the near vision zone are of the same length. That is, the near vision zone would be defined by a circumference.

In another preferred embodiment of the progressive vision lens according to the invention, the progressive zone is defined by a region substantially in the shape of a circular crown. Preferably, the annulus is secant to the perimeter of the progressive vision lens.

In a particular case of the progressive vision lens according to the invention, the two preferred embodiments mentioned above can be combined, in such a way that the near vision zone is defined by a circumference and the progressive zone is defined by a shaped region sensibly circular crown, being able to be secant with the perimeter of the progressive vision lens. In such a particular case, preferably, the diameter of the circumference defining the near vision zone has a length of between 5 and 30 mm and the diameter of the annulus is between 35 and 65 mm.

The far vision zone of the progressive vision lens according to the invention can be defined by an outline in the shape of a waning moon.

Preferably, in the progressive vision lens according to the invention, the center of the near vision zone and the center of the lens are aligned with respect to the ordinate axis of the lens.

The progressive zone can be recorded on the inner face or the outer face of the progressive vision lens. In the event that the progressive zone is recorded on the inner face, other aspects of the need for vision, such as myopia, hyperopia or astigmatism, could be recorded on the outer face of the lens. On the other hand, in the case that the progressive zone is recorded on the outer face, the other aspects of the need for vision could be recorded on the inner face of the lens.

It should be noted that progressive vision lenses can have both spherical and aspheric morphology. In this sense, the aspherical lens turns out to be a little flatter than the spherical one. This leads to a perception by the patient of a more natural vision and with less distortion of the focused image. In addition to the aesthetic advantage and an optimization in the amount of material, this type of lens improves marginal astigmatism as well as peripheral vision, as in the present invention.

Brief description of the drawings

The foregoing and other advantages and characteristics will be more fully understood from the following detailed description of some embodiments with reference to the attached drawings, which are to be considered as illustrative and not limiting, in which:

- fig. 1 shows two views (a, b) of a lens of the current state of the art.

- fig. 2 represents a preferred embodiment of the progressive vision lens according to the present invention.

Detailed description of a realization example

In view of the aforementioned figures and, according to the numbering used, it can be seen in fig. 2 an example of a preferred embodiment of the invention, comprising the parts indicated and described in detail below.

As shown in fig. 2, an example of embodiment of the progressive vision lens has three differentiated zones: the near vision zone (1), the progressive zone (2) and the far vision zone (3).

The near vision zone (1) is defined by an elliptical region, surrounded by the progressive zone (2) which is surrounded by the far vision zone (3).

That is, once the near vision zone (1) and the progressive zone (2) have been defined, the far vision zone (3) is the remaining zone of the progressive vision lens.

Likewise, the center of the near vision zone (1) and the center of the lens are at a predetermined distance that depends on the morphology of the patient's eye and the necessary graduation of the latter to compensate for its refractive error.

Specifically, for this preferred embodiment of Fig. 2, the elliptical region of the near vision zone (1) has a major axis and a minor axis that are identical in length, thus defining a circumferential region. Preferably, the diameter of said circumferential region is between 5 and 30 millimeters.

For its part, the progressive area (2) has the shape of a circular crown, defined as the area between two concentric circumferences, but not limited to it, the inner circumference being the near vision area (1). In this preferred embodiment, the outer radius of the annulus is greater than the distance between the center of the near vision zone (1) and the profile of the lens, thus defining a truncated or secant annulus.

Preferably, the length of the outer diameter of the circular crown that delimits the progressive zone (2), and surrounds the near vision zone (1), ranges between 35 and 65 millimeters and the inner diameter is the same length as the diameter of the circumferential region of the near vision zone (1).

Likewise, the far vision area (3) of this embodiment has a waning moon shape or lunula that corresponds to the area of the lens remaining to the circular crown (2).

It should be noted that the lunula is formed by the intersection between an outer circumference and another secant to it. In this case, the outer circumference is the profile of the lens, while the secant circumference is the circular crown that defines the progressive zone (2).

One skilled in the art will be able to make modifications and variations from the shown and described embodiments without departing from the scope of the present invention as defined in the appended claims.

Claims (11)

1. Progressive vision lens that presents a near vision zone, a progressive zone and a far vision zone characterized in that the near vision zone is defined by an elliptical region, surrounded by the progressive zone which is surrounded by the zone of far vision such that the center of the near vision zone and the center of the lens are at a predetermined distance. Progressive vision lens according to the preceding claim, in which the major axis and the minor axis of the elliptical region are of the same length. 3. Progressive vision lens according to any of the preceding claims, in which the progressive zone is defined by a region substantially in the shape of a circular crown. Progressive vision lens according to the preceding claim in which the circular crown is secant with the perimeter of the lens. Progressive vision lens according to claims 2 and 3 or according to claims 2 and 4 in which both axes of the elliptical region have a length of between 5 and 30 mm and the diameter of the circular crown is between 35 and 65 mm. Progressive vision lens according to any one of the preceding claims, wherein the far vision zone is defined by an essentially waning moon shaped outline. 7. Progressive vision lens according to any of the preceding claims in which the center of the near vision zone and the center of the lens are aligned with respect to the ordinate axis of the lens. 8. A progressive vision lens according to any of the preceding claims, wherein the progressive zone is engraved on the inner face and other aspects of the need for vision are engraved on the outer face. A progressive vision lens according to any one of claims 1 to 7, wherein the progressive zone is etched on the outer face and other aspects of the need for vision are etched on the inner face. 10. Progressive vision lens according to any of the preceding claims, wherein the morphology of the lens is spherical. 11. A progressive vision lens according to any of claims 1 to 9, wherein the morphology of the lens is aspherical.