ES1058102U - Therapeutic contact lens. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Therapeutic lenses that have an internal profile adapted to be inserted in the corneal surface of the eye (1), said profile comprising a first curve or optical zone (10), with a greater radius than the corneal radius, which connects with a second curve ( 20) forming an angle with it defining a first ring of tear accumulation (15) when inserted into the eye (1), said second curve (20) being smaller than the first curve (10), and a peripheral curve (50) that has a much larger radius than the previous curves (10, 20), characterized in that said profile has additional curve pairs (30, 40) that are arranged forming an angle between each other creating respective cavities (35) in a manner that additional tear rings are defined when they are inserted into the eye (1). (Machine-translation by Google Translate, not legally binding)

Description

Therapeutic lens

The present invention relates to contact lenses  therapeutics whose new features provide numerous advantages, as will be detailed herein.

Contact lenses or contact lenses are known called inverse geometry, intended to correct the eye problems during sleeping hours. It is about contact lenses that have a design that exerts a pressure controlled over the eye while sleeping causing the shape of the cornea suits the shape of the lens. These contact lenses modify, therefore, the corneal curvature producing a reduction of the longitudinal axis of the eye.

The inner face of the rigid contact lenses  They are manufactured by carving spherical or aspherical curves from the center to the periphery of the lenses so that a profile is defined that It presents a series of curves or bands.

The contact lenses used in the current events as inducers of curvature modification corneal are characterized by presenting a first curve called optical zone, radius larger than the corneal radius, a second curve of radius smaller than the previous one, also called the closing curve, which is adjusted to be close to the cornea, one or more curves more open than the previous one and that contact the cornea and  a last curve of radius much greater, denominated curve peripheral

In reverse geometry contact lenses, the curve that follows the central curve or optical zone (first curve of the lens) has a smaller radius than the previous one, creating a annular space in which tear accumulates. The image of the adaptation is similar to that of a soup dish (contact lens) located on a sphere (cornea).

This arrangement of curves produces an annular area  at the end of the optical zone, or central curve, separated from the cornea, so when inserted into the eye a zone accumulates in that area tear thickness more than enough to dye it with sodium fluorescein can be seen with cobalt blue light a Intense bright green ring. In this way, the lenses can be defined according to the profile of the tear layer that accumulates under the lens and can be represented graphically as a cut from the center of the lens to the edge of it.

Although there are currently many designs of profile of this type of lens, all of them correspond to variations of the same lens profile described, that is, the one that in which there is a single annular area of lacrimal accumulation.

One of the great current difficulties in the lens adaptation is that great expertise is necessary for part of the professional adapter. This is because the lenses they must conform to a sagittal error less than five microns, giving decentralization problems when loose, and problems of corneal distortion when adjusted producing both cases a distortion of vision. This is especially difficult when the cornea has astigmatism, because of the height Corneal sagittal is different in the two axes, producing a bad adjustment, offset and poor correction.

On the other hand, the current technique is limited as to the degree of reduction of myopia, the speed of correction and diameter of the treatment area.

The present invention proposes lenses of therapeutic contact with which they manage to overcome problems and inconveniences arising from contact lenses used to date.

For this, contact lenses are arranged treatments that have the fundamental characteristic that, at Insert them into the eye, produce two or more tear rings. I know it is, therefore, about contact lenses with more than one area of tear accumulation between the inner face of the lens and the surface corneal eye. The formation of at least two rings of tear is due to the particular internal profile of the lens of the invention. Thus, among the curves that define the aforementioned profile, after the first tear ring there is a curve (before the last curve or peripheral curve) that has a radius greater than the closing curve Then there is another smaller radius curve than the previous one forming an annular groove arranged so that there is a greater accumulation of tear in it. This can be repeated one or more times

By inserting the contact lens in the eye and Fluorescein staining occurs in addition to the annular ring central, a second or more bright green rings that demonstrate the accumulation of tear in those areas.

This particular profile of contact lenses reverse geometry therapeutics of the invention provides a greater tolerance in the adaptation of the lenses and, therefore, They facilitate the use. By allowing a better redistribution of the epithelium corneal allow astigmatisms and lenses to be treated more successfully adjusted by increasing the adjustment tolerance to fifteen microns. This it is advantageous both in manufacturing and in adaptation.

With the lenses that are proposed in accordance with the invention also obtains a corneal molding speed greater and, therefore, shortening of treatments. Other advantage of the invention is that it is possible to achieve greater Myopia reduction compared to current lenses. In addition, the contact lenses of the invention allow to maintain the ability to lens centering as well as a good area diameter of treatment.

The characteristics and advantages of the lens  therapeutic object of the present invention will be clearer from the detailed description of a preferred embodiment of the same. This description will be given, from now on, by way of non-limiting example, with reference to the drawings.

In these drawings:

Figure 1 is a schematic view that illustrates the internal profile of a conventional lens of the state of The technique;

Figure 2 is a schematic view that illustrates the internal profile of a lens according to a embodiment of the invention illustrating an example of a profile lens with double zone of tear accumulation;

Figure 3 is a graph showing the semi-profile of the tear layer located under the conventional lens of figure 1; Y

Figure 4 is a graph showing the semi-profile of the tear layer located under the lens of the invention shown in figure 2.

Referring first to the figure No. 2 of the drawings attached herein, some therapeutic lenses according to the invention have a internal profile as illustrated.

The example lens profile illustrated according to the invention it is adapted to be inserted in the eye (1), and includes the following curves:

- a separate first curve or optical zone (10) of the corneal apex, forming a tear accumulation ring (15). Is first curve (10) may have a radius greater than the radius corneal, between 0.2 and 1.50 mm larger, for example 0.60 mm, which it can correspond to a diameter normally between 5 and 8 mm;

- a second curve (20) linked to the area optics (10) described above forming an angle such that allows to define a first tear accumulation ring (15) when It is inserted into the eye (1). This second curve (20) has a radius less than the aforementioned first curve (10). The value of the radius of the second curve (20) corresponds to the value of the radius of the optical zone (10) minus a value that ranges between 0.2 and 2 mm. The width of this  curve is between 0.40 and 1.50 mm;

- a third curve (30) corresponding to the first curve of a second tear accumulation ring (35), the which separates from the cornea of the eye (1). This third curve (30) it has a radius greater than the second curve (20), with a value that corresponds to the value of the radius of the second curve (20) plus a value that ranges between 0.2 and 2 mm. This third curve (30) presents a width between 0.10 and 1.40 mm;

- a fourth curve (40) corresponding to the second curve of said second tear accumulation ring (35). Therefore, curves (30) and (40) form an angle to each other to define the second cavity (35) corresponding to said second tear accumulation ring. The radius of the fourth curve (40) is less than that of the third curve (30), with a value included between its radius minus a value between 0.2 and 2 mm. This fourth  curve (40) has a width ranging from 0.10 to 1.4 mm; Y

- a peripheral curve (50) that has a radius  much larger than the previous ones, separating from the fourth curve (40) to form the edge of the lens which allows the lens of the cornea of the eye (1). The radius of the mentioned curve peripheral (50) corresponds to the value of the fourth curve (40) plus a value between 1 and 3 mm.

In the internal profile of the double ring lens of tear (15, 35) of the example shown according to the invention, the separate areas of the cornea are filled with tear. It will be understood that they are possible, within the inventive scope of the present invention, lens profile designs with more than two tear accumulation rings.

In this way, curves can also exist additional transition between the second curve (20) of the profile and the first curve (30) of the second ring (35) of lacrimal accumulation and additional transition curves between the second curve (40) of the second ring (35) of lacrimal accumulation and peripheral curve (50). There may also be other pairs of curves that make up other tear accumulation rings.

According to the prior art illustrated in Figures 1 and 3 of the accompanying drawings, the contact lenses Conventional only have a single accumulation ring tear (150). Thus, in Figure 1 the internal profile is observed of a conventional lens with the central zone or optical zone (100) separated from the corneal apex forming the aforementioned accumulation ring tear (150), as can be seen. In this figure you shows the second curve (200), the third curve (300) which, at Unlike the invention, it is parallel to the cornea of the eye (1), and the peripheral curve (500), which separates from it forming the lens edge.

Figure 3 shows the semi-profile, it is that is, the area from the center to the edge of the lens, of the tear layer located under the conventional lens of figure n ° 1. In said graph of figure 3 the height or thickness of the tear layer trapped under the lens (values in µ) as well as the correspondence of the different curves (100, 200, 300, 500) of the semi-profile of the conventional lens of the figure No. 1 across it (distance to apex) according to the zones (a, b, c, d) of the abscissa axis of the graph.

The semi-profile graph shown in the Figure 3 can be compared with the graph of Figure 4, which illustrates the half-profile of the tear layer located under a lens of two zones of lacrimal accumulation corresponding to the rings (15, 35) of the example of figure 2 according to the invention. In the graph of the aforementioned figure 4 shows the height or thickness of the tear layer trapped under the lens (values in µ) and the correspondence of the different curves (10, 20, 30, 40, 50) of the semi-profile of the lens of the invention of Figure 2 at its width (distance to apex) according to the zones (A, B, C, D, E) of the abscissa axis of the graph. From the comparison of both graphs can be seen the formation of the accumulation zone additional tear (35) in the lens of the invention being able to there are realizations with more additional zones, as it has been indicated above.

Described sufficiently in what consists the therapeutic lenses of the present invention in correspondence with the attached drawings, it will be understood that they can be introduced in the same any modification of detail that is estimated convenient, as long as the essential characteristics of the invention summarized in the following claims are not altered

Claims (3)

1. Therapeutic lenses that have an internal profile adapted to be inserted into the corneal surface of the eye (1), said profile comprising a first curve or optical zone (10), with a radius greater than the corneal radius, which links to a second curve ( 20) forming an angle with it defining a first tear accumulation ring (15) when inserted into the eye (1), said second curve (20) being smaller than the first curve (10), and a peripheral curve (50) which has a radius much larger than the previous curves (10, 20), characterized in that said profile has pairs of additional curves (30, 40) that are arranged at an angle to each other creating respective cavities (35) so that additional tear rings are defined when inserted into the eye (1). 2. Therapeutic lenses according to claim 1, characterized in that it comprises two additional curves (30, 40) defining a second cavity or tear accumulation ring (35) when inserted into the eye (1), said two curves being a first curve (30) of said second tear accumulation ring (35) which has a radius corresponding to the value of the radius of the previous curve (20) plus a value that ranges between 0.2 and 2 mm, and a second curve ( 40) of said second tear accumulation ring (35) with a radius corresponding to the radius of the previous curve (30) minus a value between 0.2 and 2 mm. 3. Therapeutic lenses according to claim 1, characterized in that it comprises additional transition curves between the second curve (20) of the profile and the first curve (30) of the second tear accumulation ring (35), and additional transition curves between the second curve (40) of the second tear accumulation ring (35) and said peripheral curve (50).