ES1267984U - VISION CORRECTION LENS (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Vision correction lens (1); of the type comprising a lenticular body (2) with an optical center (20) characterized in that the optical center (20) is off-center with respect to the central point (10) of the lens (1). (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

VISION CORRECTION LENS

OBJECT OF THE INVENTION

The present invention refers to a vision correction lens, which can encompass two types: intraocular and ocular surface.

BACKGROUND OF THE INVENTION

All lenses for ophthalmic use have an optical center, which is usually at the geometric center of the optical center. The human eye, however, is not a centered optical system since its surfaces are not of revolution or centered and perpendicular to each other, which means that it does not have an optical axis that coincides with the geometric centers of its structures. What it does have is a visual axis, which is defined as the one that joins the fixation object with the first nodal point and the second nodal point with the center of the foveola in the retina. This axis is also called achromatic, because the rays that pass through it neither deviate nor show transverse chromatic aberration, or this is minimal.

We can also define the pupillary axis, which is the one that joins the fixation object with the center of the entrance pupil of the eye. The angle formed by the visual axis and the pupillary is called the kappa and its projection on the cornea is called the “mu chord”.

Leaving aside the lenses that go in frames (spectacle lenses) there are two other types of lenses that are used very frequently, and which are contact lenses -or lenses-, and intraocular lenses -which are inserted inside the globe. eyepiece in different positions to try to compensate for the graduation defects that an eye may have or for problems of lack of transparency, especially at the level of the lens (cataract) -, and which are classified into anterior chamber intraocular lenses -the so-called ICL-, and pseudophakic intraocular lenses.

In cataract surgery, a cut -capsulorhexis- is made in the lens capsule, then the capsule of the lens nucleus is emptied, and the intraocular lens is placed inside this capsule.

Both contact lenses and intraocular lenses comprise a lenticular body with a centered optical center. Intraocular lenses, in addition, have on the sides called haptic filaments or haptic handles, which serve so that the lens is held and centered within the capsule according to the geometric axes of its structures, that is, as aligned as possible with the axis pupillary, so that the central point of the lens - the center of the set that encompasses the lenticular body and the haptic loops, and where the optical center of the lenticular body is located - is located in coincidence with the center of the capsule, and therefore so with the pupillary axis. In contact lenses, the centering is done by the concave shape of the lens itself, corresponding to the convexity of the cornea in the pupil area.

The haptic handles of the intraocular lenses are symmetrical and have the same dimensions, so that the lens -when it is placed in the capsular bag- is centered with respect to this capsule, and depending on the anatomy of each individual it will have a better or worse centering. with respect to the pupillary axis.

Therefore, the centering of intraocular lenses - both phakic and pseudophakic lenses - and of contact lenses with respect to the position of the pupillary axis, depending on the anatomy of the patient, can result in entoptic phenomena such as halos, distortion, prismatic effect, ghost lights, etc. It is especially important to center trifocal bifocal multifocal intraocular lenses, etc., which by their design require greater precision in centering, preferably with respect to the monocular and / or binocular visual axis.

DESCRIPTION OF THE INVENTION

The vision correction lens of the invention is of the type that comprises a lenticular body with an optical center where, according to the invention, the optical center is off-center with respect to the central point of the lens, that is, the geometric center with respect to the lens edge (the edge of the lenticular body in contact lenses or the center of the set that includes the lenticular body and the haptic handles) and that is the one is positioned on the axis of the pupil when the lens is in place.

In this way, by having the optic center displaced, with respect to the pupil axis, it is possible, knowing the patient's visual axis by means of a previous study, to place said optic center in positional coincidence with said visual axis (the centering of the lens is allowed - of its optical center - in the projection on the cornea of the visual axis), and in this way avoid distortions in the result of the vision, due to variations in the patient's own anatomy.

Indeed, knowing the position of the monocular and / or binocular visual axis (the one that joins the fixation object with the point of maximum resolution of the eye on the retina, which is the foveola and specifically in the most central part of the foveola, which is the foveolar umbo of approximately 0.15 mm in diameter) on the cornea, the surgeon can have one or more intraocular lenses of the invention with different decentrations, and can choose the one that best suits each case, for better centering with respect to of the monocular and / or binocular visual axis of each patient.

But it also has the following advantages from the optical point of view:

-Better visual quality.

-Less prismatic effect.

-Minimal transverse chromatic aberration.

-Better binocular balance.

-Reduction of spherical aberration.

-More precise optical correction.

-Better foveolar centering.

-More aplanatic optical system.

Which provides the following advantages to the patient:

-Better visual comfort, because it is directly related to centering.

-The phenomenon of parasitic lights is reduced.

-The vertical deviations of the visual axes, which cause a multitude of skeletal muscle problems and work absenteeism, can be more easily compensated for, due to postural pain, related to these alterations.

-It greatly improves binocular visual convergence at short visual distances.

-Minimizes interventions (operations) for correction or rejection of intraocular lenses due to non-adaptation to vision.

DESCRIPTION OF THE DRAWINGS

Figures 1a and 1b.- respectively show a lens of the invention in contact lens format, and the same lens placed in an eye.

Figure 2.- Shows a partial section of a pupil with a lens of the invention in intraocular format, placed.

Figures 3 and 4.- They show views of both variants of the lens of the invention in intraocular format.

PREFERRED EMBODIMENT OF THE INVENTION

The vision correction lens (1) of the invention is of the type (see figs. 1a and 2) that comprise a lenticular body (2) with an optical center (20), where according to the invention, the optical center (20) is off-center with respect to the central point (10) of the lens (1) (that is, the point coinciding with the pupillary axis (22)).

In a first embodiment of the invention (see figs. 1a and 1b), the optical center (20) is off-center with respect to the geometric center (21) of the lenticular body (2) (which will be defined by the edge of the lens in lenses contact) so that, although the lenticular body (2) is centered with respect to the pupil (and therefore with respect to the pupillary axis (22)), its optical center (20) is off-center with respect to the central point (10) of the lens (1), which is coincident with the geometric center (21) of the lenticular body (2). This is the embodiment in the case of contact lenses, both soft and hybrid with scleral and rigid scleral support, which currently have their optic center (20) in the geometric center (21), so that by means of the invention it is possible to implement different decenters that can be in 0.1mm steps towards the nasal or temporal, also depending on whether they are for a right or left eye, in addition to the de-centering in the superior and inferior. Thus, and as an example, we could request a lens for the right eye with 0.3 mm nasal decentration and 0.5 mm lower with the power and radii of required curvature.

Due to the criticality of the centering of the same to maintain the optical center in coincidence with the visual axis (100) of the eye, once placed, they must have a marking (11) (laser engraving for example) that indicates eye and decentration, thus as the orientation marks at the bottom of the same to know the result of positioning the lens once it is placed in the eye. In order for the positioning to be as stable as possible and in order to prevent the lens from rotating in the eye, it is convenient that the lens has internal curvature radii that adapt to the surface of the cornea, for example 7.80 mm in the horizontal meridian and 8.10 mm in the vertical, which makes rotation difficult, they can also have aspherical surfaces, which can also help to facilitate adaptation, in addition to the visual advantages that these types of surfaces provide.

In order to make it easier for the lens to self-center and position itself for use, the lens should have a lower base ballast or prism (12), which provides more weight in the lower area of the lens, together with the markings on that area that help both the professional and the user, to visually identify which position for use is appropriate.

Both the centering of diffractive or multifocal ocular surface lenses, as well as the centering of diffractive and multifocal intraocular lenses, is especially important for an optimal visual result.

In a second embodiment of the invention (see Figures 2 to 4), the lenticular body (2) comprises haptic handles (3) for centering the lens capsule (5). It would be the option for intraocular lens. Therefore, these haptic handles (3) can be made asymmetrical (see figs. 3 and 4), achieving an off-center placement of the lenticular body (2) so that the optical center (20) of the lenticular body (2) is positioned coinciding with the visual axis (100). In these intraocular lenses, asymmetric haptics (3) and optical center (20) can be combined (see fig 2) off center with respect to the geometric center (21) of the lenticular body (2). For their part, the haptic handles (3) can be simple, branched, simple and branched haptic handles (3) can be combined in the same lens, and / or comprise eyelets (30).

Having sufficiently described the nature of the invention, it is indicated that the description of the itself and its preferred embodiment should be interpreted in a non-limiting way, and encompassing all the possible variants of embodiment that may be deduced from the content of this specification and the claims.

Claims (11)

1. -Vision correction lens (1); of the type comprising a lenticular body (2) with an optical center (20) characterized in that the optical center (20) is off-center with respect to the central point (10) of the lens (1). 2. -Vision correction lens (1) according to claim 1, wherein the optical center (20) is off-center with respect to the geometric center (21) of the lenticular body (2). 3. -Vision correction lens (1) according to claim 2, which incorporates identification and positioning markings (11). 4. -Lens (1) vision correction according to any of claims 2 or 3, comprising internal radii curvature adapted to the surface of the cornea in several axes. 5. -Lens (1) vision correction according to any of claims 2 to 4 comprising aspherical surfaces. 6. -Lens (1) vision correction according to any of claims 2 to 5, comprising a ballast or prism (12) lower base. 7. -Vision correction lens (1) according to any of claims 1 or 2, wherein the lenticular body (2) comprises haptic handles (3) for centering on the lens capsule (5). 8. -Vision correction lens (1) according to claim 7, where the haptic handles (3) are asymmetric. 9. Vision correction lens (1) according to any of claims 7 or 8, wherein the haptic handles (3) are simple. 10. Vision correction lens (1) according to any of claims 7 or 8, wherein , where the haptic handles (3) are branched. Vision correction lens (1) according to any of claims 7 to 10, wherein the haptic handles (3) comprise eyelets (30).