JPH0755227B2 - Mold for molding intraocular lens precursor and method for manufacturing intraocular lens - Google Patents

Description

The present invention relates to a mold for molding an intraocular lens precursor and a method for manufacturing an intraocular lens using this mold.
More specifically, the present invention relates to a molding die for molding a precursor of an intraocular lens in which an optical portion and a support portion are integrally molded, and a method for manufacturing an intraocular lens using this molding die.

[Conventional technology]

The intraocular lens is used as a means for recovering the visual acuity of the eye from which the lens has been removed due to cataract.

The intraocular lens generally includes an optical part (lens part) and a support part for fixing the optical part in the eye. In recent years, in consideration of ease of production, an intraocular lens in which an optical portion and a supporting portion are integrally formed of the same material has come to be used (Japanese Patent Laid-Open No. 62-172947, Japanese Laid-Open Patent Publication No. 62-172947). Sho 63-91230
issue).

However, even with the method described in the above publication, it is not always easy to produce an intraocular lens in which the optical portion and the support portion are integrally formed of the same material.

[Problems to be Solved by the Invention]

In the method described in JP-A-62-172947, the optical axis of the optical part is easily displaced, and therefore, the guide pin and the guide hole are provided in the mold to prevent the displacement of the optical axis. However, the intraocular lens itself is small, and even a slight deviation of the optical axis poses a problem in practical use. Therefore, high accuracy is required for installing the guide pin and the guide hole.

Further, in the method described in JP-A-63-91230, after forming an intraocular lens block, one surface of this block is cut and polished including the surface corresponding to the optical part to obtain an intraocular lens. However, cutting and polishing of the intraocular lens requires advanced technology, and the materials that can withstand cutting and polishing are limited to hard materials such as polymethylmethacrylate.

By the way, a method is known in which a glass optical lens such as a spectacle lens or a camera lens is press-formed with a small misalignment (Japanese Patent Laid-Open No. 61-6139).

However, the chemical properties and the physical properties of glass and resins for intraocular lenses are significantly different. Further, as for the shape, the intraocular lens has an optical portion and a supporting portion, whereas the glass optical lens described above does not have a supporting portion.

Therefore, the method disclosed in Japanese Patent Laid-Open No. 61-6139 cannot be used as it is for an intraocular lens. For example, in this method, heat-softened glass is press-molded by a molding die, but when molding an intraocular lens, the material is neither heat-softened nor pressed.

Therefore, an object of the present invention is to provide a molding die for molding an intraocular lens precursor which does not require optical axis alignment of the optical portion upon molding and does not need to cut and polish the optical portion.

A further object of the present invention is to provide a method capable of manufacturing an intraocular lens which does not require optical axis alignment of the optical part and which does not require cutting and polishing of the optical part.

[Means for Solving the Problems]

The present invention is a mold for molding a precursor of an intraocular lens composed of an optical part and a support part, which mold comprises an upper mold and a lower mold, and the lower surface of the upper mold is a concave spherical surface. And has a concave curved surface for molding the optical part near the top of this convex spherical surface, the upper surface of the lower mold is a concave spherical surface, and the radius of curvature of the convex spherical surface of the lower surface of the upper mold is the lower mold. Is larger than the radius of curvature of the concave spherical surface of the upper surface of the lower mold, and the vertical center axis of the lower surface of the upper mold is rotatable in the curved direction of the upper surface of the lower mold, and the peripheral edge of the lower surface of the upper mold is abutted on the upper surface of the lower mold. The present invention relates to a molding die characterized by forming a gap having the shape of an intraocular lens precursor between the lower surface of the mold and the upper surface of the lower mold. In the present specification,
This mold may be referred to as a mold 1.

Furthermore, the present invention is a mold for molding a precursor of an intraocular lens composed of an optical part and a support part, which mold comprises an upper mold, a lower mold and a ring-shaped product, and the upper mold. Has a convex spherical surface on its lower surface, and has a concave curved surface for molding the above-mentioned optical portion near the top of this convex spherical surface, and the upper surface of the lower mold has a concave spherical surface. , The lower center of the upper mold and the lower mold of the upper mold so that the vertical center axis of the lower face of the upper mold is rotatable and a gap in the shape of the intraocular lens precursor is formed between the lower surface of the upper mold and the upper surface of the lower mold. The present invention relates to a molding die, wherein a ring-shaped material is arranged between the molding die and the upper surface of the molding die. In the present specification, this mold may be referred to as the mold 2.

Furthermore, the present invention relates to a method for manufacturing an intraocular lens using the above molds 1 and 2.

The present invention will be described in detail below.

Mold 1 The mold 1 is a mold for molding the precursor 3 of the intraocular lens composed of the optical part 1 and the support part 2 shown in FIGS. 1a and 1b.

The mold 1 comprises an upper mold 10 shown in FIGS. 2a and 2b and a lower mold 20 shown in FIGS. 3a and 3b. The lower surface 11 of the upper mold 10 forms a convex spherical surface, and the optical unit 1 is provided near the top of the convex spherical surface.
It has a concave curved surface 12 for molding. The concave curved surface 12 is
It may be spherical or aspherical. On the other hand, lower mold 20
The upper surface 21 of is a concave spherical surface. The radius of curvature of the convex spherical surface of the lower surface 11 of the upper mold 10 is larger than the radius of curvature of the concave spherical surface of the upper surface 21 of the lower mold 20.

Then, the upper mold 10 shown in FIGS. 2a and 2b and the FIGS.
As shown in FIG. 4, the lower die 20 shown in FIG. 3b is placed on the upper surface 21 of the lower die 20 with the peripheral edge 13 of the lower surface 11 of the upper die 10 in contact. Since the radius of curvature of the convex spherical surface of the lower surface 11 of the upper mold 10 is larger than the radius of curvature of the concave spherical surface of the upper surface 21 of the lower mold 20, an intraocular gap is formed between the lower surface 11 of the upper mold 10 and the upper surface 21 of the lower mold 20. A gap 5 in the shape of the lens precursor 3 can be formed. Furthermore, upper mold 10
The vertical center axis L of the lower surface 11 of the lower mold 20 can freely rotate in the curved direction of the upper surface 21 of the lower mold 20. Therefore, the vertical center axis L is set to the angle θ.
As long as the upper mold 10 is swung inside, the gap 5 having the same shape can be formed regardless of the position and angle of the upper mold 10 with respect to the lower mold 20, and the intraocular lens precursor 3 having a desired shape can be obtained. It can be molded. The angle θ with respect to the vertical central axis L is
There is no particular limitation as long as the peripheral edge 13 of the lower surface 11 of the upper mold 10 is within a range in which it can contact the upper surface 21 of the lower mold 20.

Mold 2 The mold 2 is a mold for molding the precursor 4 of the intraocular lens, which is composed of the optical portion 1 and the support portion 2 shown in FIGS. 5a and 5b.

Like the molding die 1, the molding die 2 also comprises an upper die 10 shown in FIGS. 2a and 2b and a lower die 20 shown in FIGS. 3a and 3b.
However, unlike the molding die 1, the molding die 2 has a lower surface of the upper die 10.
The radius of curvature of the convex spherical surface of 11 may be smaller than, equal to, or larger than the radius of curvature of the concave spherical surface of the upper surface 21 of the lower mold 20.

As shown in FIG. 6, the vertical center axis of the lower surface 11 of the upper die 10 is made rotatable in the direction of the curved surface of the upper surface 21 of the lower die 20 so that the lower surface 11 of the upper die 10 and the upper surface 21 of the lower die 20 are separated from each other. A lower surface 11 of the upper mold 10 and a lower mold 20 are formed so as to form a gap 6 in the shape of the intraocular lens precursor 4 therebetween.
A ring-shaped object (30) is arranged between the upper surface (21) and the upper surface (21).

The way of arranging the ring-shaped object 30 is determined by the peripheral edge 13 of the lower surface 11 of the upper mold 10.
Or a ring-shaped object 30 is formed such that a part of the ring-shaped object 30 is formed on the peripheral edge 13 of the lower surface 11 of the upper mold 10 as shown in FIG.
Ocular lens precursor 4
It is also possible to form the supporting portion 2 of the above into an elliptical shape.

Further, the ring-shaped material 30 may be an unbroken O-ring, or may be a linear filament formed into a ring shape. If a filament is used as the ring-shaped material 30, an opening 34 can be formed between the two end portions 32 and 33 of the filament 31 as shown in FIG. When the precursor 4 of the intraocular lens is manufactured, the opening 34 is provided along with the intraocular lens material in the injection port of the intraocular lens material and in the gap between the lower surface 11 of the upper mold 10 and the upper surface 21 of the lower mold 20. It can be used as a discharge port for entering energy. Further, the ring-shaped material 30 may be composed of one or more filaments.

As is clear from FIGS. 5b and 6, the thickness of the ring-shaped material 30 is determined by the thickness of the support portion 2 of the precursor 4 of the intraocular lens. The material of the ring-shaped material 30 is a fiber that can be molded into a ring-shaped material, such as PP (polypropylene) or PVDF.
A material such as (vinylidene fluoride) that has been conventionally used as a support portion for an intraocular lens or a surgical suture thread is preferable in terms of diameter accuracy and safety. There is no particular limitation as long as it does not elute or deteriorate under the curing conditions of the intraocular lens material and can form a ring. The curing conditions for the intraocular lens material are as follows, for example.

Polymethylmethacrylate heat polymerization: The temperature is gradually raised from room temperature to around 120 ° C to complete the polymerization. It takes 1 to 5 days to complete the polymerization.

Silicone elastomer heat polymerization: Heat and hold at 60 to 80 ° C. for 2 to 3 days to complete the polymerization.

PVA gel low temperature crystallization: Hold at -20 to 30 ° C for 2 to 24 hours to complete crystallization.

As shown in FIGS. 9 and 10, the upper mold 10 used for the molding dies 1 and 2 penetrates from the upper surface 14 to the lower surface 11 of the upper mold 10, or
Alternatively, it is preferable to have at least one through hole 16 penetrating from the side surface 15 of the upper mold 10 to the lower surface 11.

Alternatively, as shown in FIGS. 11a and 11b, the upper mold 10 used for the molds 1 and 2 has a side surface 15 on the lower surface 11 of the upper mold 10.
It is preferred to have at least one groove 17 reaching

The shape and size of the through hole 16 and the groove portion 17 can be appropriately determined in consideration of the viscosity of the intraocular lens material, the injection method, and the like. For example, the through hole 16 may have a cylindrical shape of 0.15 to 0.4 mm.

The through hole 16 and the groove portion 17 are provided on the lower surface 11 of the upper mold 10 at positions that do not come into contact with the concave curved surface 12 for molding the optical unit 1. This is because, when the obtained intraocular lens precursor is molded, the intraocular lens which is the product can be removed from the portion corresponding to the through hole 16 or the groove 17 of the support portion 2.

The through hole 16 or the groove portion 17 of the upper mold 10 is the precursor 3 of the intraocular lens.
Or, in the production of 4, the injection port of the intraocular lens material, the escape port of the excess intraocular lens material, or the lower surface of the upper mold 10.
It can be used as a discharge port for bubbles that have entered the gap between the upper mold 21 and the lower mold 20 together with the intraocular lens material.

The upper mold 10 and the lower mold 20 of the mold of the present invention can be made of, for example, glass or a resin having excellent heat resistance and solvent resistance such as polycarbonate and polysulfone. In particular, it is preferable to use a material having transparency so that the state can be observed in the gap between the shapes of the intraocular lens precursor formed by the upper mold and the lower mold.

In the molding dies 1 and 2 of the present invention having the above-described structure, the upper surface 21 of the lower mold 20 is composed of a single spherical surface as shown in FIGS. Wherever the lower surface 11 of the upper die 10 is fitted, the shapes of the gaps 5 and 6 in the molding dies 1 and 2 are unchanged. Therefore, with the mold of the present invention, it is not necessary to align the axes, and the intraocular lens precursor can be easily molded from a hard material or a soft material.

Further, in the molding die of the present invention, when the concave curved surface 12 of the upper mold 10 is a spherical surface, the molding surfaces of the upper mold 10 and the lower mold 20 (the lower surface 11 of the convex spherical surface, the concave curved surface 12 for molding the optical portion 1 and Since the upper surface 21) of the concave spherical surface is composed of only spherical surfaces, it is easy to manufacture the molding die, and as a result, the cost is reduced.

Intraocular lens manufacturing method In the manufacturing method of the present invention, in FIGS. 4 and 6, the intraocular lens material is injected into the gap 5 or 6 of the mold 1 or 2 described above, and the material is cured and cured. The intraocular lens precursor obtained in this manner is released from the mold, and if necessary, the supporting portion of the intraocular lens precursor is further molded to manufacture the intraocular lens.

The injection of the intraocular lens material 40 into the gap of the mold 1 is performed by the upper mold.
In the case of using a material that does not have the through hole 16 or the groove portion 17 as the material 10, as shown in FIG. 12, for example, by using a syringe 41 or the like, the intraocular lens material 40 is provided on the upper surface 21 of the lower mold 20. And then the upper mold 10 is moved until the peripheral edge 13 of the lower surface 11 comes into contact with the upper surface 21 to form a gap 5 in the shape of the intraocular lens precursor 3.
By forming.

When the upper mold 10 having the through hole 16 or the groove 17 is used, as shown in FIG.
The upper surface 21 of the lower mold 20 and the peripheral edge of the lower surface 11 of the upper mold 10.
13 is abutted to form the gap 5 in the shape of the intraocular lens precursor 3, and then the intraocular lens material 40 is filled with the through hole 16 or the groove portion 17.
(Pour through hole 16 in Fig. 13).

The injection of the intraocular lens material 40 into the gap of the molding die 2 is performed by the upper die.
In the case of using a material that does not have the through hole 16 or the groove portion 17 as the material 10, as shown in FIG. 14, for example, by using a syringe 41 or the like, the intraocular lens material 40 is provided on the upper surface 21 of the lower mold 20. Then, the upper mold 10 is moved until the ring-shaped object 30 provided along the peripheral edge 13 of the lower surface 11 comes into contact with the upper surface 21, thereby forming the gap 6 in the shape of the intraocular lens precursor 4. To do.

At this time, it is preferable that the ring-shaped material 30 is adhered and fixed to the lower surface 11 of the upper mold 10 from the viewpoint of easy operation.

When the upper die 10 having the through hole 16 or the groove portion 17 is used, as shown in FIG.
Etc. are used to dispose a ring-shaped object 30 between the upper surface 21 of the lower mold 20 and the lower surface 11 of the upper mold 10 to form the gap 6 in the shape of the intraocular lens precursor 4, and then the material for the intraocular lens. 40 is poured from the through hole 16 or the groove portion 17 (the groove portion 17 in FIG. 15).

Bubbles may enter into the mold gap 5 or 6 together with the intraocular lens material. In particular, if bubbles are contained in the concave curved surface 12 for molding the optical part 1 and cannot be used as an intraocular lens, the bubbles are expelled from the concave curved surface 12 by tilting the molding die. Upper mold 10 having through hole 16 and groove portion 17
Filaments 31 as a ring-shaped material 30
When (FIG. 8) is used to form the opening 34 between the two end portions, bubbles can be eliminated from the through hole 16, the groove 17 or the opening 34 from the gap 5 or 6 of the mold. preferable.

As the intraocular lens material 40, a conventionally known material can be used as it is. Intraocular lens materials are exemplified below.

Examples of the monomer include (meth) acrylate-based monomers such as hydroxyethyl (meth) acrylate, methyl (meth) acrylate, allyl (meth) acrylate, ethyl (meth) acrylate and butyl (meth) acrylate, N-vinylpyrrolidone and dimethylacrylamide. Can be mentioned. A crosslinkable monomer is preferably added to this monomer in order to obtain an intraocular lens having high solvent resistance and excellent shape stability. Examples of the crosslinkable monomer include ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate and divinylbenzene. It is appropriate to add the crosslinking monomer in an amount not exceeding 10 parts by weight with respect to 100 parts by weight of the monomer. Further, as a polymerization initiator of the monomer, a radical polymerization initiator such as benzoyl peroxide, azobisisobutyronitrile, azobismethylvaleronitrile or the like is used with respect to 100 parts by weight of the monomer.
It is suitable to add in the range of 0.01 to 0.1 parts by weight.

As the intraocular lens material, polyvinyl alcohol dissolved in a mixed solvent of water and an organic solvent may be used. Examples of the organic solvent include dimethyl sulfoxide, glycerin, ethylene glycol, propylene glycol, triethylene glycol, dimethylformamide, methyl alcohol, ethyl alcohol, acetone, tetrahydrofuran, aminoethanol, phenol, n-propyl alcohol and the like. The mixing ratio of water and the organic solvent is preferably 90:10 to 10:90 by weight.

Further, as the intraocular lens material, a linear polymer such as a mixture of two-component silicone rubber and a curing agent, a mixture of raw material rubber and a vulcanizing agent, a mixture of a prepolymer and a curing agent, and a linear polymer thereof are used.
Mention may be made of a mixture with a cross-linking agent which causes dimensional cross-linking.

Examples of the two-component silicone rubber include vinyl group-containing polydimethyl silicone as a main component, and polymethylhydro-dimethylsiloxane copolymer as a curing agent thereof. It should be noted that platinum is useful as a catalyst for accelerating the crosslinking reaction of the above two components, and is usually contained in the main agent.

Examples of the raw material rubber include commercially available liquid rubbers such as liquid polybutadiene rubber, butyl rubber and polyisobutylene. Further, examples of the vulcanizing agent include commercially available peroxides such as sulfur, methyl ethyl ketone peroxide, acetyl peroxide and t-butyl hydroperoxide.

Examples of prepolymers include polyisoprene, polybutadiene, butadiene-acrylonitrile copolymers, polyolefins, and commercially available telechelic liquid rubbers in which the molecular end functional group such as polyoxypropylene rubber is a hydroxyl group, and polyisocyanate as a curing agent thereof. Examples can be exemplified. Further, as the prepolymer, polyisoprene,
Examples of telechelic liquid rubbers such as polybutadiene, butadiene-acrylonitrile copolymer, and polyolefin-based rubber in which the molecular end functional group is a carboxyl group,
Examples of the curing agent include diepoxides.

The intraocular lens material 40 injected into the mold is cured. Here, the term “hardening” refers to the type of intraocular lens material,
Takes various forms.

For example, when the intraocular lens material is the above monomer, curing means polymerization of the monomer. Further, when the intraocular lens material is polyvinyl alcohol, curing means crystallization of polyvinyl alcohol. Further, when the intraocular lens material is a mixture of a linear polymer and a cross-linking agent that three-dimensionally cross-links it, curing means curing by three-dimensional crosslinking.

The intraocular lens precursor obtained by curing is released from the mold. The mold release of the intraocular lens precursor can be performed by, for example, immersing the mold together with a solvent for a certain period of time in a solvent that causes the intraocular lens precursor to swell or contract. As such a solvent, ethanol and water can be used when the intraocular lens precursor is polyvinyl alcohol. In addition, the intraocular lens precursor is polymethylmethacrylate (PM
If MA), acetone can be used.

The released intraocular lens precursor is obtained by forming the supporting portion 2 into various shapes to obtain an intraocular lens. The molding method can be appropriately determined depending on the material of the intraocular lens precursor, and for example, it can be punched into a desired intraocular lens diameter and shape, laser processed, or cut and polished. If the end face of the support part becomes an acute angle due to punching or the like, depending on the hardness of the material, barrel polishing, mechanical polishing with cloth, film, etc., to round or temporary heating. It can be rounded by melting.

The shape of the intraocular lens obtained by the molding process is not particularly limited, and the intraocular lens may be molded into a conventionally known shape. Figures 16 and 17 show examples of intraocular lenses obtained by molding.
Shown in the figure. The broken line in the figure shows the contour of the intraocular lens precursor of the molded body.

〔The invention's effect〕

With the molding die of the present invention, it is not necessary to align the axes, and the intraocular lens precursor can be easily molded from a hard material or a soft material.

Furthermore, the method for manufacturing an intraocular lens using the mold of the present invention is easy to manufacture because it is not necessary to align the axes,
And the optical characteristics of the obtained intraocular lens (with respect to the optical axis)
Is excellent. Furthermore, according to the manufacturing method of the present invention, an intraocular lens can be easily manufactured from a hard material or a soft material.

〔Example〕

Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Example 1 20 g of polyvinyl alcohol having a polymerization degree of 1750 and a saponification degree of 98.0 mol% was added to 80 g of an 80 wt% dimethylsulfoxide aqueous solution, and heated at 115 ° C. for 2 hours in an autoclave to be uniformly dissolved. This solution was injected into the gap 5 through the through hole 16 of the glass mold using the upper mold 10 having the through hole 16 shown in FIG.

Then, the mold containing the polyvinyl alcohol solution was crystallized in a freezer at -10 ° C for 5 hours. After crystallization, the obtained intraocular lens precursor was immersed in distilled water, and the distilled water was replaced several times to completely replace the dimemethyl sulfoxide with water.

Next, the obtained intraocular lens precursor made of a hydrous gel of polyvinyl alcohol was punched into a shape shown in FIG. 16 using a punching machine having a sharp blade such as a trepan for transplantation surgery. Then, the end face of the punched support was barrel-polished to obtain an intraocular lens.

Example 2 100 parts by weight of methyl methacrylate, 2 parts by weight of ethylene glycol dimethacrylate, and 0.1 parts by weight of azobisisobutyronitrile were uniformly stirred to give a fourth solution.
The glass mold shown in the figure was poured into the upper surface 21 of the lower mold 20, and then the upper mold 10 was placed thereon.

This mold is heated at 40 ° C for 8 hours, 80 ° C for 6 hours, then 120
It was heat-cured at 0 ° C. for 6 hours. The obtained intraocular lens precursor was immersed in acetone and released from the mold, and then the supporting portion was cut and polished into a loop shape as shown in FIG. 17 to obtain an intraocular lens.

Example 3 100 parts by weight of a two-component silicone rubber base compound (trade name: KE-106, manufactured by Shin-Etsu Silicone Co., Ltd.) and a curing agent (trade name: Cat-R)
G, manufactured by Shin-Etsu Silicone Co., Ltd.) 10 parts by weight were stirred to obtain a solution. This solution was poured into the gap 6 of the mold shown in FIG. Then, it was cured by heating at 60 ° C. for 72 hours.

The obtained intraocular lens precursor was punched with a punch to obtain the intraocular lens shown in FIG.

[Brief description of drawings]

FIGS. 1a and 5a are plan views of the intraocular lens precursor, respectively, and FIGS. 1b and 5b are respectively the central portion of the intraocular lens precursor (line AA in FIGS. 1a and 5a). ) Is a cross-sectional view of FIG. FIG. 2b is a plan view of the upper mold 10, and FIG. 2a is a view of FIG.
It is an A line sectional view. FIG. 3b is a plan view of the lower mold 20,
FIG. 3a is a sectional view taken along the line AA of FIG. 3b. FIG. 4 is a longitudinal sectional view of the central portion of the molding die 1 of the present invention, and FIG. 6 is a longitudinal sectional view of the central portion of the molding die 2 of the present invention. FIG. 7 shows that the ring-shaped material 30 is attached to the lower surface 11 of the upper mold 10 in an elliptical shape. FIG. 8 shows a ring-shaped material 31 made of filament. 9 and 10 show an upper mold 10 having through holes 16 respectively.
It is a longitudinal cross-sectional view of the central portion of. FIG. 11b is a plan view of the upper mold 10 having the groove portion 17, and FIG.
The drawing is a sectional view taken along the line AA of FIG. 11b. 12 to 15 show the intraocular lens material in the mold of the present invention.
FIG. 5 is a vertical cross-sectional view of the center of the molding die, showing how to inject 40. 16 and 17 show the contour of the intraocular lens precursor (broken line).
And the intraocular lens (solid line). 3, 4: Intraocular lens precursor, 10: Upper mold, 20: Lower mold, 30: Ring-shaped material, 40: Intraocular lens material

Claims (5)

[Claims] 1. A mold for molding a precursor of an intraocular lens comprising an optical part and a support part, the mold comprising an upper mold and a lower mold, the lower face of the upper mold being convex. Has a concave curved surface for molding the optical part near the top of the convex spherical surface, the upper surface of the lower mold is a concave spherical surface, and the radius of curvature of the convex spherical surface of the lower surface of the upper mold is It is larger than the radius of curvature of the concave spherical surface on the upper surface of the lower mold, and the vertical center axis of the lower surface of the upper mold is rotatable in the curved direction of the upper surface of the lower mold, and the peripheral edge of the lower surface of the upper mold is abutted on the upper surface of the lower mold. A mold having a shape of an intraocular lens precursor formed between the lower surface of the upper mold and the upper surface of the lower mold. 2. A molding die for molding a precursor of an intraocular lens composed of an optical portion and a support portion, the molding die comprising an upper die, a lower die and a ring-shaped article. Has a convex spherical surface on its lower surface, and has a concave curved surface near the top of this convex spherical surface for molding the above-mentioned optical portion. , The lower center of the upper mold and the lower mold of the upper mold so that the vertical center axis of the lower face of the upper mold is rotatable and a gap in the shape of the intraocular lens precursor is formed between the lower surface of the upper mold and the upper surface of the lower mold. A molding die characterized in that a ring-shaped material is arranged between the upper surface and the upper surface. 3. The molding die according to claim 1, wherein the upper die has at least one through hole between the upper surface and the lower surface of the upper die or between the side surface and the lower surface of the upper die. 4. The molding die according to claim 1, wherein the upper die has at least one groove portion which reaches a side surface of the upper die on a lower surface of the upper die. 5. An intraocular lens material is injected into the gap of the mold according to claim 1, the material is cured, and the intraocular lens precursor obtained by curing is released from the mold. Then, the method for producing an intraocular lens is characterized in that the supporting portion of the intraocular lens precursor is further processed.