JPH0279016A - Bifocal contact lens - Google Patents

Bifocal contact lens

Info

Publication number
JPH0279016A
JPH0279016A JP23090288A JP23090288A JPH0279016A JP H0279016 A JPH0279016 A JP H0279016A JP 23090288 A JP23090288 A JP 23090288A JP 23090288 A JP23090288 A JP 23090288A JP H0279016 A JPH0279016 A JP H0279016A
Authority
JP
Japan
Prior art keywords
resin
lens
refractive index
contact lens
holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23090288A
Other languages
Japanese (ja)
Inventor
Sadao Kanbe
貞男 神戸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP23090288A priority Critical patent/JPH0279016A/en
Publication of JPH0279016A publication Critical patent/JPH0279016A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/049—Contact lenses having special fitting or structural features achieved by special materials or material structures
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/042—Simultaneous type
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/16—Laminated or compound lenses

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)

Abstract

PURPOSE:To obtain the inexpensive bifocal contact lens which eliminates the need for moving the line of sight and for giving care to the upper and lower positions of the lens by consisting the lens of two kinds of materials which are different in refractive index and forming the lens in such a manner that the one material is diverted to plural parts and scatter in the other material. CONSTITUTION:A 1st resin 4a of a circular cylindrical shape having the suitable refractive index is prepd. and is bored with holes of a required number. Plural 2nd resins 42 which have the diameter to be tightly fitted into these holes and have the different refractive index are prepd. and are fitted into the holes of the 1st resin. The combined resin is heated to the temp. higher than the glass transition point of the resin and is elongated, by which a resin rod having a desired diameter is obtd. The rod is subjected to cutting, grinding and polishing to obtain the desired bifocal contact lens. A user views a far object with the part of the low refractive index resin and a near object with the high refractive index part. The inexpensive bifocal contact lens which eliminates the need for moving the line of vision and for giving care to the upper and lower position of the lens is obtd. in this way.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はパイフォーカルコンタクトレンズに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to pifocal contact lenses.

〔発明の概要〕[Summary of the invention]

これからの時代は平均寿命がのびて、高齢者が増加する
ので老視対策が必要である。今は視力に不自由がない人
も、いずれ老視について一度は考えねばならないときが
くるのは必至である。従来よりもちいられている老視矯
正法は、老視眼鏡をもちいる方法がもっとも一般である
。コンタクトレンズ装用者でしかも老視の初期の者はモ
ノビジョン　テクニーク、あるいは、コンタクトレンズ
と眼鏡を併用する方法が利用されている。近年、パイフ
ォーカルコンタクトレンズが実用化された。In the future, as the average life expectancy increases and the number of elderly people increases, measures to prevent presbyopia will be necessary. Even if you do not have visual impairments today, the time will inevitably come when you will have to think about presbyopia. The most common method of correcting presbyopia that has been used in the past is to use presbyopia glasses. Contact lens wearers who are in the early stages of presbyopia use the monovision technique or a combination of contact lenses and glasses. In recent years, pifocal contact lenses have been put into practical use.

〔従来の技術〕[Conventional technology]

従来のパイフォーカルコンタクトレンズとしては、第１
図（ａ）、（ｂ）、第２図（ａ）、　　（ｂ）第３図（
ａ）、　　（ｂ）に示すごとく、同心円二重焦点レンズ
、部分二重焦点レンズがあった０図において１１．２１
は近用光学類を、１２．２２は遠用光学類をしめす。As a conventional pifocal contact lens, the first
Figures (a), (b), Figure 2 (a), (b) Figure 3 (
As shown in a) and (b), 11.21 in Figure 0 where there were concentric bifocal lenses and partial bifocal lenses.
12.22 indicates near vision optics and distance vision optics.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし、従来のパイフォーカルコンタクトレンズには、
遠用、近用のきりかえ時視線をずらさなければならない
という問題点があった。又、上部が遠用、下部が近用と
分かれているときは、レンズ装用時、レンズの上下に気
をつける必要がある。However, conventional pifocal contact lenses have
There was a problem in that the user had to shift their line of sight when switching between distance and near vision. Also, when the upper part is for distance use and the lower part is for near use, it is necessary to be careful about the top and bottom of the lens when wearing the lens.

さらに、レンズの形状が非球面となるため、製造が困難
となり、コスト高になる欠点がある。そこで本発明は、
新規パイフォーカルコンタクトレンズを考えることによ
って、視線を動かす必要がなく、レンズの上下を気にす
ることもなく、製造が簡単で、非常に安いパイフォーカ
ルコンタクトレンズを提供することを目的とするもので
ある。Furthermore, since the lens has an aspherical shape, it is difficult to manufacture and has the disadvantage of increasing costs. Therefore, the present invention
By devising a new pi-focal contact lens, we aim to provide a pi-focal contact lens that does not require moving your line of sight, does not require you to worry about the top and bottom of the lens, is easy to manufacture, and is extremely cheap. be.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のパイフォーカルコンタクトレンズは、屈折率の
異なる２種類の素材よりなり、その形状はレンコン状（
レンニンにかぎらない）に複数の穴のあいた一方の素材
に他方の素材を充填したことを特徴とする。The pifocal contact lens of the present invention is made of two types of materials with different refractive indexes, and its shape is lotus root (
It is characterized by one material having multiple holes (not limited to rennin) filled with the other material.

穴はｌ１ｌｌ、ていても、いなくともよい。製造の容易
さから、貫通しているほうがより好適である。There may or may not be holes. From the viewpoint of ease of manufacture, it is more preferable to have a through hole.

素材としては、プラスチックレンズやコンタクトレンズ
等にもちいられる材料はいずれも使用可１ｍである。し
かし、製造方法によっては熱硬化性樹脂は使用出来ない
こともある。As for the material, any material used for plastic lenses, contact lenses, etc. can be used for a length of 1 m. However, depending on the manufacturing method, thermosetting resins may not be used.

これらの素材のｍ個を以下にあげる。m of these materials are listed below.

素材　　　　　　　　　　　屈折率 ポリメチルメタクリレ−１−１，４９３８ポリメチルア
クリレート　　　１．４０３２ポリシロキサニルメタク
リレート ポリフルオロメタクリレート ポリスチレン　　　　　　　　１．５８５シリコンラバ
ー ポリジメチルシロキサン ポリビニルピロリドン ポリ−２−ヒドロキシエチルメタクリレートこの他にビ
ニルメチルメタクリレート等の官能基を２個以上含有す
るモノマーとの共重合物も使用可能である。Material Refractive index polymethyl methacrylate-1-1,4938 Polymethyl acrylate 1.4032 Polysiloxanyl methacrylate Polyfluoromethacrylate Polystyrene 1.585 Silicon rubber Polydimethylsiloxane Polyvinylpyrrolidone Poly-2-hydroxyethyl methacrylate Other vinyl methyl A copolymer with a monomer containing two or more functional groups such as methacrylate can also be used.

さらに、上記素材の原料モノマーを２種以上用い重合さ
せた樹脂をもちいることもできる。本発明のパイフォー
カルコンタクトレンズの作り方は以下のとおりである。Furthermore, it is also possible to use a resin obtained by polymerizing two or more raw material monomers of the above materials. The method for making the pifocal contact lens of the present invention is as follows.

まず適当な屈折率を有す円柱形の第一の樹脂を用意し、
必要な数だけ穴をあける。次にこの穴にきっちりはいる
ような直径を有し、第一の樹脂の屈折率と異なる屈折率
を有す、複数の、第二の樹脂を用意し、第一の樹脂の穴
の中にはめこむ。First, prepare a cylindrical first resin with an appropriate refractive index,
Drill as many holes as needed. Next, prepare a plurality of second resins that have a diameter that fits exactly into this hole and have a refractive index different from that of the first resin, and insert them into the holes of the first resin. Fit it in.

このようにして得た、合体樹脂を樹脂のガラス転移点よ
り高温にしたリングヒーター中を張力をかけながら延伸
し、所望の径の樹脂ロッドをえる。The thus obtained combined resin is stretched in a ring heater heated to a temperature higher than the glass transition point of the resin while applying tension to obtain a resin rod of a desired diameter.

このロッドを従来の方法により、切断、研削、研磨を行
うことにより目的とするパイフォーカルコンタクトレン
ズを得ることができる。この他の方法として以下のこと
が考えられる。The desired pifocal contact lens can be obtained by cutting, grinding, and polishing this rod using conventional methods. Other possible methods include the following.

まず第一の樹脂でロッドを複数本つくる０次に、このロ
ッドを適当な間隔をもたせ、大口径の円筒容器に複数本
しこむ、しかるのち第二の樹脂の原料モノマーを、該円
筒容器の空間部に仕込み、適当な条件により重合させる
。完全に重合がすすんだところで容器からロッド状重合
物を取り出す。First, a plurality of rods are made from the first resin.Next, these rods are placed at appropriate intervals and inserted into a large-diameter cylindrical container.Then, the raw material monomer for the second resin is poured into the space of the cylindrical container. and polymerize under appropriate conditions. When polymerization has completely progressed, the rod-shaped polymer is taken out from the container.

取り出したロッドがコンタクトレンズ径と概ね同じであ
るならば、このロッドから従来の方法により、切断、研
削、研磨等の工程を経て、目的とするパイフォーカルコ
ンタクトレンズをえることができる。If the diameter of the rod taken out is approximately the same as that of the contact lens, the desired pifocal contact lens can be obtained from this rod through processes such as cutting, grinding, and polishing using conventional methods.

ロッドの口径が大きいときは、上記の延伸の方法を使っ
て細くしてから、切断、研削、研磨すればよい。If the diameter of the rod is large, use the stretching method described above to make it thinner, then cut, grind, or polish it.

閉孔した穴を用いる場合、板状の第一の樹脂にまず適当
な間隔で穴をあける。この穴に第二樹脂のロッドをさし
こむ、　　ｆｌ！られた板状の樹脂から円゛盤状樹脂を
切り出したのち、研削、研磨を行い、目的とするパイフ
ォーカルコンタクトレンズをえる。レンズの特性は、第
一、第二樹脂の屈折率、レンズの厚み、レンズの曲率半
径等を適当に変えることにより、かえることができる。When using closed holes, holes are first made at appropriate intervals in the plate-shaped first resin. Insert the second resin rod into this hole, fl! After cutting out a disc-shaped resin from the plate-shaped resin, it is ground and polished to obtain the desired pifocal contact lens. The characteristics of the lens can be changed by appropriately changing the refractive index of the first and second resins, the thickness of the lens, the radius of curvature of the lens, etc.

〔作用〕[Effect]

第４図（ａ）、　　（ｂ）に本発明のパイフォーカルコ
ンタクトレンズの概略図をしめす。図において、４１は
第一樹脂、４２は第二樹脂をしめす。FIGS. 4(a) and 4(b) show schematic diagrams of the pifocal contact lens of the present invention. In the figure, 41 indicates a first resin, and 42 indicates a second resin.

このようなレンズを装用した場合、遠方を見る場合は低
屈折率樹脂の部分で、近くを見るときは高屈折部分でみ
ることになる。このとき、視線を動かす必要はない。When wearing such a lens, you will need to use the low refractive index resin part to see far away, and the high refractive part to see close up. At this time, there is no need to move your gaze.

また、図かられかるように、はぼ上下、左右対称になる
ため、上下方向を気にしなくてもよい効果を有する。Furthermore, as can be seen from the figure, since it is vertically and horizontally symmetrical, there is an effect that there is no need to worry about the vertical direction.

さらに、従来のレンズの様に非球面にする必要がないの
で製造がかんたんになり、レンズが安くなる効果がある
。Furthermore, unlike conventional lenses, there is no need to make the lens aspherical, making it easier to manufacture and making the lens cheaper.

以下、実施例により本発明の詳細を示す。Hereinafter, the details of the present invention will be shown by examples.

〔実施例〕〔Example〕

直径３センチメートルのポリメチルメタクリレート樹脂
のロッドを用意し、中心に１つと、中心から１．５セン
チメートル離れたところに、直径が０．５センチメート
ルの貫通孔を６個、合計７個の穴をあけた。Prepare a rod of polymethyl methacrylate resin with a diameter of 3 cm, and make a total of 7 through holes, one in the center and 6 through holes with a diameter of 0.5 cm at a distance of 1.5 cm from the center. I made a hole.

続いて、直径がおおよそ０．　５センチメートルのポリ
スチレン樹脂のロッドを前記貫通孔にさしこんだ。Next, the diameter is approximately 0. A 5 cm rod of polystyrene resin was inserted into the through hole.

このようにして得られたロッドを１５０度Ｃに設定され
たリングヒーター中をとおし、直径が１センチメートル
になるまで延伸した。このとき、２種類の樹脂間に気泡
が残らないよう、加熱部分の反対側のロッドにゴム管を
取り付け、樹脂間を減圧の状態にした。The rod thus obtained was passed through a ring heater set at 150° C. and stretched to a diameter of 1 cm. At this time, a rubber tube was attached to the rod on the opposite side of the heated part to reduce the pressure between the resins so that no air bubbles remained between the two types of resins.

延伸したロッドを従来の方法により、切断、研削、研磨
をおこなうことにより、第４図（ａ）。The elongated rod is cut, ground, and polished by conventional methods to obtain the resultant material shown in FIG. 4(a).

（ｂ）にしめした、パイフォーカルコンタクトレンズを
得た。A pifocal contact lens shown in (b) was obtained.

以上実施例を述べたが、本発明は以上の実施例のみなら
ず、広く他の材料、他の構造、他の製造方法などに応用
が可能である。Although the embodiments have been described above, the present invention can be widely applied not only to the above embodiments but also to other materials, other structures, other manufacturing methods, etc.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明によれば、視線を動かす必要が
なく、レンズの上下を気にする必要がない、安価なパイ
フォーカルコンタクトレンズが提供出来るという効果を
有する。As described above, the present invention has the advantage that it is possible to provide an inexpensive pifocal contact lens that does not require moving the line of sight or worrying about the vertical position of the lens.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図（ａ）、（ｂ）、第２図（ａ）、（ｂ）、第３図
（ａ）、　　（ｂ）は、従来のパイフォーカルコンタク
トレンズの概略を表す図であり、第４図（ａ）、　　（
ｂ）は本発明のパイフォーカルコンタクトレンズの概略
を表す図である。 １１・・・近用光学類 １２・・・遠用光学類 ２１・・・近用光学領 ２２・・・遠用光学類 ４１・・・第一樹脂 ４２・・・第二樹脂 以　　上 出願人　セイコーエプソン株式会社 代理人　弁理士　鈴木　喜三部　他１名（Ａ）　　　　
　　　　（Ｄ） 第１図 第２図 第３図1(a), (b), FIG. 2(a), (b), and FIG. 3(a), (b) are diagrams schematically showing conventional pifocal contact lenses. Figure (a), (
b) is a diagram schematically showing the pifocal contact lens of the present invention. 11...Near optics 12...Distance optics 21...Near optics area 22...Distance optics 41...First resin 42...Second resin and above Applicant Seiko Epson Corporation Representative Patent Attorney Kizobe Suzuki and 1 other person (A)
(D) Figure 1 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 屈折率の異なる二種類の材料よりなり、一方の材料は複
数の部分にわかれ、他の材料中に散在していることを特
徴とするバイフォーカルコンダクトレンズ。A bifocal conductive lens is made of two types of materials with different refractive indexes, and one material is divided into multiple parts and is scattered in the other material.
JP23090288A 1988-09-14 1988-09-14 Bifocal contact lens Pending JPH0279016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23090288A JPH0279016A (en) 1988-09-14 1988-09-14 Bifocal contact lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23090288A JPH0279016A (en) 1988-09-14 1988-09-14 Bifocal contact lens

Publications (1)

Publication Number Publication Date
JPH0279016A true JPH0279016A (en) 1990-03-19

Family

ID=16915088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23090288A Pending JPH0279016A (en) 1988-09-14 1988-09-14 Bifocal contact lens

Country Status (1)

Country Link
JP (1) JPH0279016A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5163265A (en) * 1991-07-01 1992-11-17 Xerox Corporation Apparatus for wrapping a flexible member
US5980040A (en) * 1997-06-30 1999-11-09 Wesley Jessen Corporation Pinhole lens and contact lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5163265A (en) * 1991-07-01 1992-11-17 Xerox Corporation Apparatus for wrapping a flexible member
US5980040A (en) * 1997-06-30 1999-11-09 Wesley Jessen Corporation Pinhole lens and contact lens

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