CN112799239A - Contact lens - Google Patents

Abstract

The invention provides a contact lens which is formed by splicing a central light-transmitting area, an annular light-shielding area and an edge transparent area, wherein the annular light-shielding area surrounds the central light-transmitting area, the edge transparent area surrounds the annular light-shielding area, the central light-transmitting area is made of RGPCL, and the annular light-shielding area is made of photosensitive light-shielding materials. The invention provides a contact lens, which replaces the natural pupil function and shields corneal scars.

Description

Contact lens

Technical Field

The present invention relates to the field of contact lenses. More particularly, the present invention relates to a contact lens.

Background

Eye trauma is a common disease in ophthalmology, is one of the main causes of visual impairment, is also the leading cause of blindness in monocular, and serious people not only cause disability, but even lose labor capacity. Ocular trauma and surgery often result in changes in the dioptric system of the eye, such as corneal opacity, astigmatism, iris damage and loss, aphakia, etc., which are different from the physiological state of refraction, and make the postoperative refractive error of the patient complicated and special.

The cornea is most commonly affected by the trauma of the anterior segment of the eye, after the operation treatment, scars are usually left on the cornea, besides the beauty, the scar tissue shrinks, the shape of the surface of the cornea is also affected, and the irregular astigmatism of the cornea is caused. Clinically, the treatment of this type of astigmatism is troublesome and the methods are also diversified. At present, frame glasses are mostly adopted for vision correction in post-traumatic functional assessment indexes. However, the frame glasses cannot compensate the corneal irregularity after trauma and the existence of the lens-eye distance, so that the imaging effect is not ideal, and the optimal correction state of the injured eye cannot be really displayed. Although soft contact lenses have high water content, soft materials and high comfort, they have poor oxygen permeability and are prone to cause corneal epithelial damage, neovascularization, and complications such as dry eye and chronic keratitis when worn for a long time. In addition, corneal astigmatism is large after trauma, and soft corneal contact lenses cannot be completely corrected. RGPCL (rigid gas permeable corneal contact lens) is an ideal method for non-traumatic correction of irregular corneal astigmatism caused by various reasons. RGPCL has unique and excellent optical characteristics, can form a lens-tear film-cornea optical imaging system on the surface of cornea, and as tear fills the gap behind the lens, the front surface of the cornea can be reshaped, the corneal astigmatism (including irregular astigmatism) can be effectively eliminated, the prism effect and abnormal magnification can be eliminated, the wave front aberration of the patient with high ametropia can be reduced, and the corrected vision of the patient can be greatly improved. Meanwhile, the RGPCL is made of high oxygen permeability material, and has high oxygen permeability, small lens diameter and strong protein and lipid deposition resistance. These characteristics ensure that the cornea is sufficiently oxygenated, normal tear exchange under the lens is achieved, and the risk of corneal infection is reduced, making wearing safer. However, due to the special material, the patient may not tolerate the foreign body sensation and the wearing is abandoned.

Disclosure of Invention

The invention aims to provide a contact lens which replaces the natural pupil function and shields corneal scars.

To achieve these objects and other advantages in accordance with the purpose of the invention, a contact lens is provided that is made up of a central optically transmissive region, an annular optically opaque region surrounding the central optically transmissive region, and an edge clear region surrounding the annular optically opaque region, the central optically transmissive region being made of RGPCL, and the annular optically opaque region being made of a photosensitive opaque material.

Preferably, in said contact lens, the inner layer of said annular light-blocking region is made of a silicone hydrogel material.

Preferably, in the contact lens, the surface of the annular shading area is provided with a dyeing layer corresponding to a corneal scar of a patient.

Preferably, in said one contact lens, said tinted layer has a color that is the same as the color of the iris of the contralateral eye of the patient.

Preferably, in said one contact lens, said peripheral clear zone is made of a silicone hydrogel material.

The contact lens is formed by splicing a central light-transmitting area, an annular light-shielding area and an edge transparent area, wherein the central light-transmitting area is made of RGPCL (reduced-gloss polyethylene terephthalate), so that good vision and air permeability are provided; annular shading district adopts silicon hydrogel material to make, replaces natural pupil effect, can adjust the size in shading district along with environment light and shade change to be equipped with the dyeing layer that corresponds with patient's cornea scar through the surface in annular shading district, when sheltering from patient's cornea scar, improve the travelling comfort that the patient wore.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic diagram of a contact lens according to the present invention;

figure 2 is a comparison of a contact lens of the present invention before and after use.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the embodiment of the present invention provides a contact lens, which is formed by splicing a central light-transmitting area 1, an annular light-shielding area 2 and an edge transparent area 3, wherein the annular light-shielding area 2 surrounds the central light-transmitting area 1, the edge transparent area 3 surrounds the annular light-shielding area 2, the central light-transmitting area 1 is made of RGPCL, and the annular light-shielding area 2 is made of a photosensitive light-shielding material, such as a silicone hydrogel material.

In this embodiment, the contact lens is formed by splicing a central light-transmitting zone 1, an annular light-blocking zone 2 and a peripheral clear zone 3, wherein the central light-transmitting zone 1 is formed of RGPCL, which provides good vision and breathability. There are 3 methods for optical correction of aphakic eyes due to ocular trauma: frame glasses, corneal contact lenses, intraocular lens implants. The refractive state of the aphakic eye is high hypermetropia, and the correction of the frame glasses can cause the visual field to be reduced and the peripheral annular dark spots to be formed; meanwhile, after trauma surgery, the eyes are often monocular, the binocular disparity of the glasses with the frame is more than 5%, the monocular vision cannot be established, and the method is only suitable for correcting the aphakic eyes of the eyes. Ocular trauma often incorporates combined damage of foreign bodies in the eye, anterior segment tissues, and posterior tissues. The condition of the eye after the operation is poor, particularly after the cornea is injured, the corneal endothelial cells are already damaged, the corneal endothelial cells are sometimes damaged when the intraocular lens is implanted, and the corneal endothelial cells are easily decompensated after the operation. And also risks of conventional cataract surgery, such as postoperative astigmatism, secondary glaucoma, intraocular lens rejection, exfoliation, and the like. In the case of aphakic eyes caused by ocular trauma, the intraocular structure has changed, making intraocular lens implantation difficult and risky. Because the artificial lens can not correct corneal astigmatism, residual astigmatism is easy to occur, and postoperative vision is difficult to estimate, most patients can still only correct the corneal astigmatism through lens matching. RGPCL can effectively correct corneal astigmatism, eliminate binocular imaging inequality caused by the lens-eye distance, and has high oxygen permeability to related complications caused by corneal hypoxia. The human crystalline lens not only has refraction effect, but also can absorb short-wave ultraviolet rays to protect eyes. Aphakic patients lose this protection and are prone to ocular fundus disease, so such patients need to wear protective eyewear. The RGPCL is made of special materials, has 100 percent of protection effect on ultraviolet rays, and can effectively prevent the affected eyes from being damaged by phototoxicity. Eye trauma is often accompanied by large-area loss of the iris, the pupil of a patient can be dilated, the imaging spherical aberration and dispersion of the patient can be increased, and the corrected vision is reduced. The central light-transmitting area 1 is made of RGPCL, so that good visual quality and oxygen permeability of the central light-transmitting area are ensured. The annular shading area 2 adopts a photosensitive shading layer, changes the shading area size along with the brightness of the surrounding environment, replaces the natural pupil function, and shades corneal scars.

Preferably, as another embodiment of the present invention, the surface of the annular shading area 2 is provided with a dyeing layer corresponding to the corneal scar of the patient.

In the embodiment, the surface of the annular shading area 2 is provided with a dyeing layer corresponding to the corneal scar of the patient, and the corneal scar of the patient is shaded by the soft color layer, so that the attractiveness of the patient during wearing is improved; in addition, the color of the dyed layer is the same as the color of the iris of the contralateral eye of the patient.

Preferably, as another embodiment of the present invention, the edge transparent region 3 is made of a silicone hydrogel material.

In this embodiment, the edge transparent region 3 is made of a silicone hydrogel material, so that the wearing comfort of the corneal contact lens is improved.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims (5)

1. A contact lens, characterized in that it is composed of a central light-transmitting zone (1), an annular light-shielding zone (2) and a peripheral transparent zone (3) which are spliced together, the annular light-shielding zone (2) surrounding the central light-transmitting zone (1), the peripheral transparent zone (3) surrounding the annular light-shielding zone (2), the central light-transmitting zone (1) being made of RGPCL, the annular light-shielding zone (2) being made of a photosensitive light-shielding material.

2. A contact lens according to claim 1, characterized in that the inner layer of the annular shading area (2) is made of a silicone hydrogel material.

3. A contact lens according to claim 2, characterized in that the surface of the annular shading area (2) is provided with a dye layer corresponding to a corneal scar of the patient.

4. The contact lens of claim 3, wherein the tinted layer has a color that is the same as the color of the iris of the contralateral eye of the patient.

5. A contact lens according to any one of claims 1 to 4, characterized in that the edge clearing zone (3) is made of a silicone hydrogel material.

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