JPH06225893A - Intraocular lens - Google Patents

Abstract

PURPOSE:To provide an intraocular lens made of a material having a ultraviolet ray absorbing function and organism stability by applying or including the fine powder of an inorganic matter on the optical section of the lens. CONSTITUTION:An optical section 1 and a support section 2 are integrally molded into a one-piece type, and the same material is used for the optical section 1 and the support section 2. PMMA is used as the principal constituent of the base material of an intraocular lens, and fine grains of zinc oxide are uniformly dispersed. The biological compatibility of the zinc oxide has been confirmed. The base material dispersed with the zinc oxide can be manufactured like the conventional manufacture of a base material mixed with an organic ultraviolet ray absorbent and a dye. The zinc oxide having the grain size of 1mum or below and the purity of 99.9% or above is preferably used to obtain the base material uniformly dispersed with the grains of the zinc oxide and having a homogeneous ultraviolet ray absorbing effect. When fine grains of the zinc oxide are used as the ultraviolet ray absorbent, a considerably good ultraviolet ray absorbing effect can be obtained. Coating of several mum may be applied to the optical section 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intraocular lens which is mounted in the eye after the lens is extracted.

[0002]

2. Description of the Related Art Conventionally, an intraocular lens which is mounted in the eye after extracting a clouded lens by cataract surgery or the like is well known. In recent years, intraocular lenses in which an ultraviolet absorber is mixed with a lens material or a special coating is applied to the lens surface have been widely used in order to block or reduce ultraviolet rays. Various proposals have been made regarding the kind of the above-mentioned ultraviolet absorber, but a benzotriazole-based ultraviolet absorber is generally used.

[0003]

However, since these organic UV absorbers may partially elute in the body after they are worn in the eye, the long-term stability and carcinogenicity of the eluted UV absorbers. From the point of view, some questions were raised. Therefore, attempts have been made to prevent the ultraviolet absorber and the dye from eluting into the body by applying a special coating to the surface of the intraocular lens. However, such a special coating is difficult to manufacture, and it is difficult to obtain a coating film having stable performance. The present invention has been devised in order to solve the above problems, and an object of the present invention is to provide an intraocular lens made of a material having an ultraviolet absorbing function and biostable.

[0004]

The present invention has the following features in order to achieve the above object. (1) An intraocular lens to be mounted in the eye after the crystalline lens is extracted is characterized in that the optical part of the lens is coated or contains fine powder of an inorganic substance having an ultraviolet absorbing function.

(2) The inorganic substance of (1) is characterized by being a ceramic-based fine powder.

(3) The fine ceramic powder of (2) is characterized by being zinc oxide or titanium dioxide.

[0007]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the intraocular lens of this embodiment, which is formed integrally with the optical unit 1 and is made of the same PM material.
A typical intraocular lens in MA is an optical unit 1 for imparting refractive power.
And a support portion 2 for supporting and fixing the optical portion 1 in the eye. In this embodiment, the optical unit 1 and the supporting unit 2 are integrally molded, and the optical unit 1 and the supporting unit 2 are made of the same material. The base material of the intraocular lens is PM
Fine particles of zinc oxide ZnO having MA (polymethylmethacrylate) as a main component are evenly dispersed. Zinc oxide has already been used in cosmetics and the like, and its biocompatibility has been confirmed. The base material in which the zinc oxide is dispersed can be manufactured in the same manner as the base material in which a conventional organic ultraviolet absorber or dye is mixed. In order to obtain a base material having a uniform ultraviolet absorbing effect by uniformly dispersing zinc oxide particles, the zinc oxide particle size is preferably 1 micron or less, more preferably 0.02 to 0.04 micron. , Purity is 9
Goods of 9.9% or more are good. Zinc oxide PMM
If the weight ratio to A is 0.1 percent, the plate thickness is 1
The transmittance curve of the mm substrate is as shown in FIG. Zinc oxide Z
When nO fine particles are used as an ultraviolet absorber, a considerably good ultraviolet absorbing effect can be obtained.

[0008]

Example 2 The base material of the intraocular lens of Example 2 is PMMA.
And titanium oxide TiO ₂ fine particles are uniformly dispersed. The particle size of titanium oxide is 1 micron or less, preferably 0.01 to 0.2 micron, and the purity is 9
Goods of 9.9% or more are good. PM of titanium oxide
Assuming that the weight ratio to MA is 0.1 percent, the transmittance curve of a substrate having a plate thickness of 1 mm is as shown in FIG. Compared with the case of zinc oxide, the transmittance in this case is inferior because the transmittance in the near ultraviolet region is slightly high. Therefore, it is more effective to use titanium oxide mixed with another ultraviolet absorber than to use it alone as an ultraviolet absorber. In addition to zinc oxide and titanium oxide, calcium carbonate, alumina type and the like can be used. Further, in each of Examples 1 and 2, fine particles are contained in the lens, but the optical part may be coated with several microns. Furthermore, when the desired transmittance characteristics cannot be obtained only by coating the fine particles of the inorganic material, the amount of the benzotriazole-based compound used can be reduced by using the benzotriazole-based compound as the ultraviolet absorber together. It should be noted that the base material may contain a dye that attenuates light of a part of the wavelength, but it is more preferable to use an inorganic ceramic-based dye as this dye.

[0009]

According to the present invention, it is possible to provide an intraocular lens made of a material which has an ultraviolet absorbing function and is biostable.

[Brief description of drawings]

FIG. 1 is a front view of an intraocular lens of the present embodiment.

FIG. 2 is a transmittance curve when zinc oxide is used as an ultraviolet absorber.

FIG. 3 is a transmittance curve when titanium dioxide is used as an ultraviolet absorber.

[Explanation of symbols]

 1 Optical part 2 Support part

Claims (3)

[Claims] 1. An intraocular lens to be mounted in the eye after extracting a crystalline lens, wherein the optical part of the lens is coated or contains fine powder of an inorganic substance having an ultraviolet absorbing function. 2. An intraocular lens, wherein the inorganic substance of claim 1 is a ceramic-based fine powder. 3. The intraocular lens according to claim 2, wherein the ceramic-based fine powder is zinc oxide or titanium dioxide.