JP2004121434A - Method of tinting intraocular lens and tinted intraocular lens obtained by the method - Google Patents

Method of tinting intraocular lens and tinted intraocular lens obtained by the method Download PDF

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Publication number
JP2004121434A
JP2004121434A JP2002288138A JP2002288138A JP2004121434A JP 2004121434 A JP2004121434 A JP 2004121434A JP 2002288138 A JP2002288138 A JP 2002288138A JP 2002288138 A JP2002288138 A JP 2002288138A JP 2004121434 A JP2004121434 A JP 2004121434A
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Prior art keywords
intraocular lens
coloring
colored
substrate
optical unit
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JP2002288138A
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Japanese (ja)
Inventor
Yoshihiro Nakahata
中畑 義弘
Tsutomu Sunada
砂田 力
Minoru Inuzuka
犬塚 稔
Shigeru Nishimura
西村 茂
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Nidek Co Ltd
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Nidek Co Ltd
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Priority to JP2002288138A priority Critical patent/JP2004121434A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/00009Production of simple or compound lenses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/00865Applying coatings; tinting; colouring
    • B29D11/00894Applying coatings; tinting; colouring colouring or tinting
    • B29D11/00903Applying coatings; tinting; colouring colouring or tinting on the surface

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of tinting an intraocular lens capable of coping with the smaller incision of a cornea and equalizing the quantity of transmitting light (density of tint) regardless of the difference in the thickness of an intraocular lens optical part. <P>SOLUTION: Ink including subliming dye is applied to a substrate based on the color data managed by a computer. The applied surface of the substrate to which the ink is applied is made to face a surface to be tinted of the intraocular lens optical part, and the subliming dye is sublimated by heating the substrate. Then, by applying the subliming dye to the intraocular lens, the intraocular lens is tinted. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、眼内レンズを着色する方法及び、該方法にて得られる着色眼内レンズに関する。
【0002】
【従来技術】
近年、白内障手術後の視力補正の目的で、眼内レンズが広く利用されている。眼内レンズは通常無色透明であるのに対して、人眼水晶体は加齢とともに黄色に変色していくため、眼内レンズを挿入した際に、色合いの違和感を訴える場合がある。黄色の水晶体が無色の眼内レンズに置き換わることにより、物が青っぽく見える、いわゆる青視症である。この青視症を防ぐ目的として、眼内レンズを人眼水晶体の透過特性に合わせて予め着色した着色眼内レンズが用いられている。
【0003】
このような着色眼内レンズは、黄色や橙色等の着色剤を眼内レンズ用の基材内に混入させた後、基材を型枠内で重合させることにより、着色された光学部を得る方法がある(例えば、特許文献1参照)。また、他の方法としては、光学部を形成するための板材上に止まり穴(凹部)を形成し、そこに着色剤が混入されたモノマー(プレポリマー)を流し込んで重合させることにより、無色の層と着色された層の2層を持つ板材を得る。その後、2層を持つ板材を切削加工により加工し、着色された光学部を得る方法がある(例えば、特許文献2参照)。
【0004】
【特許文献1】
特開平7−24052号公報(第3頁段落番号
【0014】、及び第4頁段落番号
【0024】等)
【特許文献2】
特開平6−142125号公報(第3頁段落番号
【0011】、図3〜図6等)
【0005】
【発明が解決しようとする課題】
しかしながら、前者の方法(特開平7−24052号)では、光学部の材料全体に着色剤が均一に行き渡っているため、光学部の厚みによって透過光量が左右されることとなる。一般的に弱い屈折力を持つ眼内レンズでは、その光学部の厚みは薄くなるため透過光量は多くなる。反対に強い屈折力を持つ眼内レンズでは、光学部は厚くなるため、透過光量は少なくなることとなる。
【0006】
また、後者の方法(特開平6−142125号)では、前者のような光学部の厚みの違いによる透過光量の変化はなくなるが、屈折力の違いによって着色層の厚みは変化しないこととなる。したがって、昨今望まれている角膜の小切開化(眼内に挿入するために設けられる角膜上の切開創をできるだけ小さくする)に対応することは難しいこととなる。
【0007】
上記従来技術の問題点に鑑み、角膜の小切開化に対応できるとともに、眼内レンズ光学部の厚みの違いによらず透過光量を一様にすることが可能な眼内レンズの着色方法及び該方法にて得られる着色眼内レンズを提供することを技術課題とする。
【0008】
【課題を解決するための手段】
上記課題を解決するために、本発明は以下のような構成を備えることを特徴とする。
(1) 昇華性色素が含有されたインクを電子計算機にて管理された色データに基づいて基体に塗布しておき、前記インクが塗布された前記基体の塗布面を真空中に眼内レンズ光学部の着色予定面と対向させるとともに前記基体を加熱することにより前記昇華性色素を昇華させ、該昇華性色素を前記眼内レンズに付着させることにより、前記眼内レンズを着色させることを特徴とする。
(2) (1)の眼内レンズの着色方法において、前記電子計算機にて管理された色データは、着色後の眼内レンズの透過特性が人眼水晶体の透過特性に合うように考慮された色相となるような色データであることを特徴とする。
(3) (1)の眼内レンズ着色方法において、前記基体と眼内レンズ光学部とは非接触にて対向させることを特徴とする。
(4) (1)〜(3)の眼内レンズの着色方法において、前記着色された眼内レンズ全体を所定温度にて加熱することを特徴とする。
(5) (1)〜(4)の眼内レンズの着色方法において、前記眼内レンズが着色された後、眼内レンズの眼内にて固定保持させるための支持部を前記着色済眼内レンズに取り付けることを特徴とする。
(6) 基体上に塗布された昇華性染料を眼内レンズの着色予定面に対向して置き、前記基体を加熱することにより前記昇華性染料を昇華させて前記着色予定面に付着させた後、該昇華性染料が付着した眼内レンズを所定温度にて加熱することを特徴とする。
(7) (1)〜(6)の眼内レンズの着色方法を用いて着色眼内レンズを得ることを特徴とする。
【0009】
【発明の実施の形態】
本発明に着色方法に用いる眼内レンズの基材には、アクリル基材やシリコーン等、従来一般的に使用される眼内レンズの基材を使用することができる。また、アクリル基材としては、例えば硬い材料となるPMMA(ポリメチルメタクリレート)や、柔らかく折り曲げ可能な材料となるHEMA(ヒドロキシエチルメタクリレート)、n−ブチルアクリレート等を用いることができる。
【0010】
このような基材を用いて眼内レンズを製造する場合、従来の型枠に基材を流し込み、その後基材を重合させて眼内レンズ形状を形成させるインモールド方法や、板材状に重合した基材を切削加工により眼内レンズ形状に形成させる方法等、従来の眼内レンズ製造方法を用いることができる。
【0011】
本発明では、このような従来の無色透明の眼内レンズに対して、昇華性の染料を加熱により昇華させ、昇華した染料を眼内レンズに付着させることによって、その表面上に所望する着色を施すものである(以下 この着色方法を気相転写法と記す)。なお、気相転写法によって眼内レンズに着色を施す場合、染料が付着した眼内レンズをオーブンにて所定温度で加熱することによって眼内レンズの着色を完了させるため、支持部(ループ)を光学部に取り付ける作業は、このオーブンの加熱後に行うことが好ましい。光学部に支持部を取り付けた状態で、加熱を行うと、支持部が変形する可能性があるためである。
【0012】
次に、眼内レンズを用いて気相転写法による着色方法を図を基に説明する。ここで図1は本実施形態の染色方法の流れを示したフローチャート、図2は気相転写法における着色システムの概略を示した図である。本実施形態における気相転写法に用いる着色装置システムの概略を説明する。
【0013】
(1)印刷基体の作製
気相転写法では、昇華性染料を水系中に分散させてインクジェットプリンタ用のインク(分散染料インク)として用いる。インクは純水に所定の割合の分散染料と分散剤、保湿剤等とを入れ、10分以上攪拌した後、超音波ホモジナイザーで処理を行う。
【0014】
得られた混合液を粒子保持能1μmのフィルターを用いて吸引濾過をし、粒径の大きいものやごみ等を取り除く。その後、特定のインク濃度になるように純水を加え調製し、分散染料インクを完成させる。
【0015】
得られた分散染料インクをインクジェットプリンタ用のインクカートリッジにそれぞれ入れ、インクジェットプリンタ10にこのカートリッジを装着する。インクジェットプリンタ10は市販のものが使用できる。
【0016】
次に、このインクジェットプリンタ10を使用して所望の色をプリントさせるために、市販されているパーソナルコンピュータ20(以下PCという)を使用して、プリントされる色相及び濃度の調製を行う。色合いの調製はPC20内のハードディスク内に記憶されているドローソフトやCCM(コンピュータカラーマッチング)等により行う。
【0017】
昇華性染料を印刷(塗布)する基体1には、市販のA4の白紙(上質PPC用紙)を使用する。プリンターに白紙を入れ、PC20の操作により、予め設定しておいた色相及び濃度にて印刷を行う。色相及び色濃度は、着色後の眼内レンズの透過特性が人眼水晶体の透過特性に合うように考慮して決定される。また、基体1上に印刷される着色層2は、実際に着色を行う眼内レンズ光学部の大きさよりも広い範囲に形成されるようにしておく。例えば、着色層2は眼内レンズの光学部の径よりも若干長めの径を有する円形形状の図形となるように印刷しておく。着色層2の印刷範囲が光学部の大きさよりも小さい場合、光学部の着色側全面に十分染料が行き渡らない可能性があるからである。
【0018】
(2)眼内レンズへの着色
次にインクジェットプリンタ10により基体1に印刷された昇華性色素を用いて、眼内レンズの光学部に着色を行う。図2に示すように着色層2が印刷された基体1を真空気相転写機本体30内に置かれた着色用治具40にセットし、着色を行う。
【0019】
図3は着色用治具40の詳細を示した図である。41は円柱状の載置台であり、載置台41の上部には眼内レンズの光学部100が着色予定面を上向きにして置かれる。
【0020】
42は着色層2が印刷(形成)された基体1を載置するための円筒の形状を有する基体載置台である。43は基体押さえであり、基体載置台42の上部に載せられた基体1を基体押さえ43と基体載置台42とで挟み込むことにより、基体1が動かないようにしっかりと固定保持する。なお、基体1は印刷された着色層2が眼内レンズの光学部100と対向するようにして、基体載置台42上に載置される。50は上方から基体1を熱し、染料を昇華させるためのハロゲンランプ、51は真空ポンプである。
【0021】
このような真空気相転写機30と着色用治具40を用いて、真空ポンプ51にて真空気相転写機30内を真空状態にした後、ハロゲンランプ50を点灯させて基体1を加熱し、染料を昇華させる。昇華した染料は下方に置かれた眼内レンズの光学部100の片面に付着する。なお、本実施の形態では光学部100の着色予定面と基体1上の着色層2とを非接触にて対向させるものとしているが、これに限るものではなく、光学部100の着色予定面に着色層2(基体1)を当接させるようにして着色を行っても良い。
【0022】
真空気相転写機30内の真空状態は100Pa〜10KPa程度とすればよい。また、100Paを下回っても差し支えないが、高性能排気装置を必要とする。さらに、装置内の気圧が高ければ高い程、染料を昇華させるのに必要な温度が高くなるため、圧力の上限は10KPaまでが望ましい。
【0023】
また、加熱温度は基体1上で100℃を下回ると基体から染料が昇華し難くなり、また、250℃を上回ると高温による染料の変質や眼内レンズ光学部100の変形が生じ易くなる。従って加熱温度は100〜250℃の間が良いが、光学部の材料に合せてできるだけ高い温度を選ぶようにするとよい。
【0024】
真空気相転写機30により、眼内レンズ光学部100への着色(付着)が完了したら、光学部100を真空気相転写機30から取り出し、図2に示すオーブン60内に置き、所定温度で加熱し染料を定着させる。オーブン60の加熱温度は50〜150℃、加熱時間は30分〜1時間程である。オーブン60の加熱温度は光学部100の形成に使用される材料の耐熱条件によって異なる。例えばPMMAを光学部100の材料に用いた場合は、オーブン60の加熱温度は120℃程度を上限とし、シリコーンを光学部100の材料に用いた場合には200℃程度を上限とすれば良い。
【0025】
オーブン60にて光学部100を所定温度、所定時間にて加熱を行い、着色作業を完了させた後、オーブン60内から光学部100を取り出し、支持部を光学部100に取り付けることにより着色眼内レンズの完成となる。なお、光学部100に取り付ける支持部の材料は、PMMA等の従来から支持部の材料として用いられているものが使用できる。また、光学部100への支持部の取り付け作業は既存の方法を用いればよい。なお、光学部100に支持部を取り付けた状態で着色を行うことも可能であるが、支持部が着色されたり、オーブン60での加熱により支持部が変形する可能性があるため、前述したように光学部の着色が完全に終了した後、光学部100に支持部を取り付けることが好ましい。
【0026】
なお、本実施の形態では光学部100と支持部とを別々に作製し、その後一体化させる3ピースレンズを例に挙げて説明しているが、光学部と支持部とを一体的に作製する1ピースの眼内レンズにおいても本着色方法を適用することはできる。しかしながら前述したように、オーブンでの加熱により、支持部が変形する可能性があるため、加熱温度に注意しておく必要がある。
【0027】
このような気相転写法を用いることにより、眼内レンズ光学部の表面のみを着色することができる。その結果、眼内レンズの屈折度数が異なっても(中心部の厚みが異なっても)一様の透過光量を得ることができる。また、着色面を光学部の表面に限ることができるため、従来に比べ添加する染料(着色剤)の量を抑えることができる。
【0028】
また、表面のみを着色する場合は、着色用の染料が含まれている液中に所定時間だけ光学部を浸漬させて着色を行う方法(浸漬法)が考えられるが、このような着色方法では各ロット毎の着色濃度がばらつきを抑えることが非常に難しく、一定の品質を保つことが困難である。また、このような浸漬法では着色後の液の廃棄等の問題が残ることとなる。
【0029】
また、以上の実施形態では、眼内レンズの光学部の片面に着色を施すものとしているが、これに限るものではなく、光学部の両面を着色するようにしても良い。
【0030】
さらに、本実施形態の着色方法によれば、眼内レンズ光学部の全面に着色することができるが、これに限るものではなく、光学部100に対して部分的に着色を行うことも可能である。例えば、図4(a)に示すように前述したインクジェットプリンタ10及びPC20を用いて基体1上にリング形状の着色層3を形成しておく。この着色層3は眼内レンズ光学部100の周端部(コバ部)周辺のみを着色するように、着色層3の外径及び内径が決定され、基体1上に形成(印刷)される。このようなリング形状の着色層3は、青視症の抑制のために用いるのではなく、光学部100のコバ部によって生じるグレア(眩輝)の抑制や無虹彩症用の人工虹彩形成用として用いられる。
【0031】
例えば、眼内レンズのグレアの抑制に用いる場合、着色層3のリング幅は、光学部100の周端部から中心に向かって0.1mm〜1mm程度の領域(光学部100の表面)が着色されるように形成されていれば良い。また、このときの着色層3の色濃度は光学部100の着色領域が遮光性を有する程度の濃度が必要となる。
【0032】
また、光学部100に虹彩の模様を形成するためにリング形状の着色層3を用いる場合、着色層3のリング幅は光学部100の非着色領域が光学中心から好ましくはφ2.5mm〜φ5.0mm程度、さらに好ましくはφ3.0mm〜φ4.0mm程度残るように形成しておく。また、このときの着色層3の色濃度は光学部100の着色領域が虹彩模様として認識できる程度の濃度であれば良い。
【0033】
このようなリング形状の着色層3を用いて光学部100を着色する場合においても、真空気相転写機30、着色用治具40やオーブン60を用いて前述した着色作業を行う。着色は少なくとも光学部100の前面(眼内レンズを眼内に設置した際に前側となる面)に施しておくことが好ましい。また、リング状の着色を光学部100の周端部周辺に正確に行うためには、基体1上の着色層3の中心軸上に眼内レンズ光学部100の光学中心を合わせるようにして、着色用治具40に各々をセットしておけばよい。また、着色層3の中心軸上に光学部100の光学中心をより正確に合わせたい場合には、図7に示すような着色用治具70を用いればよい。
【0034】
着色用治具70は、基体1を載置する台71aと光学部100を載置する台71bとが一体的に形成された円筒状の載置台71と、基体押さえ72とからなる。台71bの中央部には、眼内レンズ光学部100の直径と同じ径を持つ凹部71cが設けられている。この凹部71cに光学部100を載置することにより、光学部100の位置が固定される。また、基体1上にはリング形状の着色層3の中心から載置台の外周径と同じ径を持つ円を印刷しておき、この基体1上に印刷された円を載置台71の外周に合わせるようにして基体1を載置台71に載置する。その結果、着色層3の中心軸上に光学部100の光学中心を位置させることができる。
【0035】
本実施形態に示す気相転写法により、リング形状の着色が施された眼内レンズ光学部100は、図4(b)に示すように着色領域100aと非着色領域100bとが形成される。その後、着色された光学部100に支持部を取り付け、眼内レンズの完成となる。
【0036】
また、このようなリング形状の着色を行う場合、着色層3を内側に向かって徐々に色濃度が薄くなるようなグラデーションとして形成しておくこともできる。このようにリング状の着色層3をグラデーション模様にて基体1上に形成しておくことにより、光学部100を着色した際に、着色領域と非着色領域との境界を不明確にさせることができるため、使用者のQOL(Quality of life)の向上に役立つ。また、光学部100の着色領域のうち、グラデーションにより薄い色にて着色されている領域は光束が透過しやすいため、虹彩模様を形成しつつ光量を確保することもできる。
【0037】
さらにまた、基体1上にリング形状の着色層3と前述した青視症の抑制のための着色層とを同時に形成させることもできる。このような着色層をもって眼内レンズの光学部100を着色することにより、青視症を抑制しつつ、グレアの抑制や人工虹彩の形成を行うことが可能となる。
【0038】
<実施例>
次に実施例として屈折力の異なる複数の眼内レンズ(光学部)に本発明の気相転写法による着色を施し、その透過率を比較したものを挙げる。
【0039】
使用した眼内レンズ材料はMMA(メチルメタクリレート)にベンゾトリアゾール系の紫外線吸収剤及び重合開始剤として2,2−アゾビスイソブチロニトリルを極微量添加した後、従来用いられている加熱重合法により板状に硬化したMMA(PMMA)の板材を切削加工により眼内レンズ光学部を得た。光学部の直径は5.5mm、周端部のコバ厚は0.17mmとした。眼内レンズは屈折力5D(中心厚0.291mm)、20D(中心厚0.660mm)、40D(中心厚1.180mm)の3種類を用意した。
【0040】
この3種類の眼内レンズを前述した気相転写法により着色した。プリンターは市販のインクジェットプリンター(セイコーエプソン(株)製 MJ−8000C)とし、昇華性インクは、ウペポ社製の分散染料(水性)を3種類(赤、青、黄)使用し、PCのドローソフトを使用して色相を(配合比赤:青:黄=3:10:1)決定した。また、同じくPCのドローソフトを使用して色の濃度を6%出力(赤)に調製した。その後、この色データに基づいて白紙(上質PPC用紙)に着色する光学部の径よりも大きめの円形を印刷し、これを印刷基体とした。
【0041】
この印刷基体の乾燥を待って、前述した真空気相転写機30、着色用治具40等を使用して印刷基体1から眼内レンズ光学部100への転写作業を行った。このときの真空気相転写機30内の真空度は1kPa、印刷基体1上の温度を250℃として1分間染料の昇華を行った。印刷基体1の着色層2から染料が殆ど昇華し、光学部100への染料の蒸着が行われていることが確認された。光学部100への転写作業後、定着させるためにオーブン60内に光学部100を置き、120℃で1時間レンズを加熱し、発色作業を完了した。その後3種類の眼内レンズ全ての透過率を分光光度計(日立製作所(株)U−4000)にて測定した。
【0042】
測定結果を図5に示す。図5において横軸は波長を縦軸は透過率を示す。また▲1▼が5.0D、▲2▼が20.0D、▲3▼が40.0としている。なお、青視症を抑制する場合、眼内レンズの着色は黄色又は橙色等の色合いで行うが、ここでは、赤色、青色、黄色のいずれの波長域においても中心厚の差による透過率の差が無いことを示すために、赤色、青色、黄色の3種類のインクを用いて眼内レンズの着色を行っている。
【0043】
<比較例>
比較例として従来の練り込みによる着色眼内レンズを作成した。用いる材料及び眼内レンズの作成方法は実施例と同様とした。また、材料に練りこむための色素は、ピラゾール系の黄色色素を極微量添加した。作成した眼内レンズ(光学部)は実施例と同様に5D、20D、40Dの3種類(中心厚等の形状条件は実施例と同じ)とした。作成した光学部の透過率を分光光度計にて測定した。その結果を図6に示す。図中▲1▼′は5D、▲2▼′は20D、▲3▼′は40Dの眼内レンズを示す。
【0044】
<結果>
図6に示すように色素を練り込んで着色眼内レンズとした比較例では、度数の違い(中心厚の違い)によって、透過率に差がでた。一方、図5に示すように、本発明の着色方法を適用した着色眼内レンズでは、中心厚が異なっても透過率は略同じとなる良好な結果が得られた。また、実施例、比較例の眼内レンズは材料にMMAを使用しているが、折り曲げ可能な軟性眼内レンズの材料においても同様の結果が得られる。
【0045】
【発明の効果】
以上のように、本発明の着色方法によれば眼内レンズの厚みによらず、一様の透過率を得ることができる。
【図面の簡単な説明】
【図1】本実施形態における着色作業の流れを示したフローチャートである。
【図2】本実施形態における着色システムの概略を示した図である。
【図3】本実施形態に用いる真空気相転写機及び着色用治具の構成を示した図である。
【図4】眼内レンズ光学部の周端部のみを着色するための着色層の形状及びこれによって着色された眼内レンズを示した図である。
【図5】実施例(気相転写法)によって着色された眼内レンズ光学部の透過率を示した図である。
【図6】比較例(練り込み)によって着色された眼内レンズ光学部の透過率を示した図である。
【図7】光学部の周端部のみ着色を施すための着色用治具を示した図である。
【符号の説明】
1 基体
2 着色層
10 インクジェットプリンタ
20 パーソナルコンピュータ
30 真空気相転写機
40 着色用治具
60 オーブン
100 眼内レンズ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for coloring an intraocular lens and a colored intraocular lens obtained by the method.
[0002]
[Prior art]
In recent years, intraocular lenses have been widely used for the purpose of correcting vision after cataract surgery. While the intraocular lens is usually colorless and transparent, the human eye lens changes its color to yellow with aging, so that when the intraocular lens is inserted, there may be a case where the color tone is uncomfortable. When the yellow lens is replaced by a colorless intraocular lens, the object looks bluish, so-called blue vision. For the purpose of preventing this blue vision, a colored intraocular lens is used in which the intraocular lens is colored in advance according to the transmission characteristics of the lens of the human eye.
[0003]
Such a colored intraocular lens is obtained by mixing a coloring agent such as yellow or orange into a base material for an intraocular lens, and then polymerizing the base material in a mold frame to obtain a colored optical part. There is a method (for example, see Patent Document 1). As another method, a blind hole (recess) is formed on a plate material for forming an optical part, and a monomer (prepolymer) mixed with a coloring agent is poured into the blind hole and polymerized to form a colorless color. A plate having two layers, a layer and a colored layer, is obtained. Then, there is a method of processing a plate material having two layers by cutting to obtain a colored optical part (for example, see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 7-24052 (paragraph number [page 3], paragraph number [page 4] etc.)
[Patent Document 2]
JP-A-6-142125 (page 3, paragraph number [0011], FIGS. 3 to 6, etc.)
[0005]
[Problems to be solved by the invention]
However, in the former method (Japanese Patent Application Laid-Open No. Hei 7-24052), the amount of transmitted light is affected by the thickness of the optical part because the colorant is uniformly distributed throughout the material of the optical part. Generally, in an intraocular lens having a weak refractive power, the thickness of the optical part is thin, so that the amount of transmitted light is large. Conversely, in an intraocular lens having a strong refracting power, the optical part becomes thick, so that the amount of transmitted light is reduced.
[0006]
In the latter method (Japanese Patent Laid-Open No. 6-142125), the change in the amount of transmitted light due to the difference in the thickness of the optical portion as in the former case disappears, but the thickness of the coloring layer does not change due to the difference in the refractive power. Therefore, it is difficult to cope with the recently desired small incision of the cornea (minimizing the incision on the cornea provided for insertion into the eye).
[0007]
In view of the above-mentioned problems of the related art, a method of coloring an intraocular lens that can cope with a small incision in the cornea and can make the amount of transmitted light uniform regardless of the difference in the thickness of the intraocular lens optical unit, and It is a technical object to provide a colored intraocular lens obtained by the method.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) An ink containing a sublimable dye is applied to a substrate based on color data managed by an electronic computer, and the coated surface of the substrate on which the ink is applied is placed in a vacuum in an intraocular lens optical system. The sublimation dye is sublimated by heating the substrate while facing the coloring scheduled surface of the part, and by attaching the sublimation dye to the intraocular lens, the intraocular lens is colored. I do.
(2) In the method for coloring an intraocular lens of (1), the color data managed by the computer is considered so that the transmission characteristics of the intraocular lens after coloring match the transmission characteristics of the human eye lens. It is characterized in that the color data is a hue.
(3) In the intraocular lens coloring method according to (1), the base and the intraocular lens optical unit are opposed to each other without contact.
(4) The method for coloring an intraocular lens according to any one of (1) to (3), wherein the entire colored intraocular lens is heated at a predetermined temperature.
(5) In the method for coloring an intraocular lens according to any one of (1) to (4), after the intraocular lens is colored, a supporting portion for fixing and holding the intraocular lens in the eye may be provided. It is characterized by being attached to a lens.
(6) After placing the sublimable dye applied on the base against the surface to be colored of the intraocular lens and heating the substrate to sublimate the sublimable dye and adhere to the surface to be colored And heating the intraocular lens to which the sublimable dye is attached at a predetermined temperature.
(7) A colored intraocular lens is obtained by using the intraocular lens coloring method of (1) to (6).
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
As the base material of the intraocular lens used in the coloring method of the present invention, a base material of an intraocular lens generally used conventionally, such as an acrylic base material or silicone, can be used. Further, as the acrylic base material, for example, PMMA (polymethyl methacrylate) as a hard material, HEMA (hydroxyethyl methacrylate) as a soft and bendable material, n-butyl acrylate, or the like can be used.
[0010]
In the case of manufacturing an intraocular lens using such a base material, the base material is poured into a conventional mold, and then the base material is polymerized to form an intraocular lens shape, or a plate material is formed. A conventional method for manufacturing an intraocular lens, such as a method of forming a base material into an intraocular lens shape by cutting, can be used.
[0011]
In the present invention, sublimation dyes are sublimated by heating the conventional colorless and transparent intraocular lens, and the sublimated dye is attached to the intraocular lens, whereby desired coloring is obtained on the surface. (Hereinafter, this coloring method is referred to as a vapor phase transfer method). When coloring the intraocular lens by the vapor phase transfer method, the intraocular lens to which the dye is attached is heated at a predetermined temperature in an oven to complete the coloring of the intraocular lens. It is preferable that the operation of attaching to the optical unit be performed after heating the oven. This is because if the heating is performed in a state where the support is attached to the optical unit, the support may be deformed.
[0012]
Next, a coloring method by a vapor phase transfer method using an intraocular lens will be described with reference to the drawings. Here, FIG. 1 is a flowchart showing the flow of the dyeing method of the present embodiment, and FIG. 2 is a diagram schematically showing a coloring system in the vapor phase transfer method. An outline of a coloring apparatus system used for the vapor phase transfer method in the present embodiment will be described.
[0013]
(1) Production of Printed Substrate In the vapor phase transfer method, a sublimable dye is dispersed in an aqueous system and used as an ink for an inkjet printer (dispersed dye ink). The ink is prepared by adding a predetermined proportion of a disperse dye, a dispersant, a humectant and the like to pure water, stirring the mixture for 10 minutes or more, and then performing a treatment with an ultrasonic homogenizer.
[0014]
The resulting mixed solution is subjected to suction filtration using a filter having a particle retention capacity of 1 μm to remove particles having a large particle size and dust. Thereafter, pure water is added to and adjusted to a specific ink concentration to complete a disperse dye ink.
[0015]
Each of the obtained disperse dye inks is placed in an ink cartridge for an ink jet printer, and the cartridge is mounted on the ink jet printer 10. A commercially available ink jet printer 10 can be used.
[0016]
Next, in order to print a desired color using the inkjet printer 10, the hue and density to be printed are adjusted using a commercially available personal computer 20 (hereinafter, referred to as PC). The color is adjusted by drawing software or CCM (computer color matching) stored in a hard disk in the PC 20.
[0017]
As the substrate 1 on which the sublimable dye is printed (coated), commercially available A4 white paper (high quality PPC paper) is used. A blank sheet is put in the printer, and printing is performed with a preset hue and density by operating the PC 20. The hue and the color density are determined in consideration of the transmission characteristics of the intraocular lens after coloring so as to match the transmission characteristics of the human eye lens. The coloring layer 2 to be printed on the base 1 is formed so as to be formed in a wider range than the size of the intraocular lens optical unit that actually performs coloring. For example, the colored layer 2 is printed so as to be a circular figure having a diameter slightly longer than the diameter of the optical part of the intraocular lens. This is because if the printing range of the colored layer 2 is smaller than the size of the optical section, the dye may not be sufficiently distributed over the entire colored side of the optical section.
[0018]
(2) Coloring the Intraocular Lens Next, the optical portion of the intraocular lens is colored using the sublimable dye printed on the substrate 1 by the inkjet printer 10. As shown in FIG. 2, the substrate 1 on which the coloring layer 2 is printed is set on a coloring jig 40 placed in the main body 30 of the vacuum vapor transfer machine to perform coloring.
[0019]
FIG. 3 is a diagram showing details of the coloring jig 40. Reference numeral 41 denotes a column-shaped mounting table. On the mounting table 41, the optical unit 100 of the intraocular lens is placed with the surface to be colored facing upward.
[0020]
Reference numeral 42 denotes a substrate mounting table having a cylindrical shape for mounting the substrate 1 on which the colored layer 2 has been printed (formed). Reference numeral 43 denotes a substrate holder, and the substrate 1 placed on the substrate mounting table 42 is sandwiched between the substrate holder 43 and the substrate mounting table 42 to firmly hold the substrate 1 so as not to move. The substrate 1 is mounted on the substrate mounting table 42 such that the printed colored layer 2 faces the optical unit 100 of the intraocular lens. 50 is a halogen lamp for heating the substrate 1 from above to sublimate the dye, and 51 is a vacuum pump.
[0021]
Using such a vacuum vapor transfer machine 30 and the coloring jig 40, the inside of the vacuum vapor transfer machine 30 is evacuated by the vacuum pump 51, and the halogen lamp 50 is turned on to heat the base 1. Sublimates the dye. The sublimed dye adheres to one side of the optics 100 of the intraocular lens placed below. In the present embodiment, the surface to be colored of the optical unit 100 and the colored layer 2 on the substrate 1 are opposed to each other in a non-contact manner. However, the present invention is not limited to this. The coloring may be performed such that the colored layer 2 (the base 1) is brought into contact with the colored layer 2.
[0022]
The vacuum state in the vacuum vapor phase transfer machine 30 may be about 100 Pa to 10 KPa. Further, the pressure may be lower than 100 Pa, but a high-performance exhaust device is required. Furthermore, the higher the pressure in the apparatus, the higher the temperature required for sublimating the dye, and therefore the upper limit of the pressure is preferably up to 10 KPa.
[0023]
When the heating temperature is lower than 100 ° C. on the base 1, the dye is less likely to sublimate from the base, and when the heating temperature is higher than 250 ° C., the deterioration of the dye and the deformation of the intraocular lens optical unit 100 due to the high temperature are liable to occur. Therefore, the heating temperature is preferably between 100 and 250 ° C., but it is preferable to select the highest possible temperature according to the material of the optical section.
[0024]
When coloring (adhesion) to the intraocular lens optical unit 100 is completed by the vacuum vapor transfer machine 30, the optical unit 100 is removed from the vacuum vapor transfer machine 30 and placed in the oven 60 shown in FIG. Heat to fix dye. The heating temperature of the oven 60 is 50 to 150 ° C., and the heating time is about 30 minutes to 1 hour. The heating temperature of the oven 60 depends on the heat-resistant conditions of the material used to form the optical unit 100. For example, when PMMA is used for the material of the optical unit 100, the upper limit of the heating temperature of the oven 60 is about 120 ° C., and when silicone is used for the material of the optical unit 100, the upper limit is about 200 ° C.
[0025]
After heating the optical unit 100 at a predetermined temperature and a predetermined time in the oven 60 to complete the coloring operation, the optical unit 100 is taken out of the oven 60, and the support unit is attached to the optical unit 100, so that the inside of the colored eye can be obtained. The lens is completed. In addition, as a material of the support unit attached to the optical unit 100, a material conventionally used as a material of the support unit such as PMMA can be used. In addition, the work of attaching the support unit to the optical unit 100 may use an existing method. Note that it is possible to perform coloring with the support unit attached to the optical unit 100; however, since the support unit may be colored or the support unit may be deformed by heating in the oven 60, as described above. After the coloring of the optical unit is completely completed, it is preferable to attach a support unit to the optical unit 100.
[0026]
In the present embodiment, the optical unit 100 and the support unit are separately manufactured, and a three-piece lens that is integrated thereafter is described as an example. However, the optical unit and the support unit are integrally manufactured. The present coloring method can be applied to a one-piece intraocular lens. However, as described above, since the support may be deformed by heating in the oven, it is necessary to pay attention to the heating temperature.
[0027]
By using such a vapor phase transfer method, it is possible to color only the surface of the optical unit of the intraocular lens. As a result, even if the refractive power of the intraocular lens is different (even if the thickness of the central portion is different), a uniform transmitted light amount can be obtained. Further, since the colored surface can be limited to the surface of the optical section, the amount of the dye (colorant) to be added can be suppressed as compared with the conventional case.
[0028]
In the case of coloring only the surface, a method of immersing the optical part in a liquid containing a coloring dye for a predetermined time to perform coloring (immersion method) can be considered. It is very difficult to suppress the variation in the coloring density of each lot, and it is difficult to maintain a constant quality. Further, in such an immersion method, a problem such as disposal of the liquid after coloring remains.
[0029]
In the above embodiment, one side of the optical section of the intraocular lens is colored. However, the present invention is not limited to this, and both sides of the optical section may be colored.
[0030]
Furthermore, according to the coloring method of the present embodiment, it is possible to color the entire surface of the intraocular lens optical unit. However, the present invention is not limited to this, and it is also possible to partially color the optical unit 100. is there. For example, as shown in FIG. 4A, a ring-shaped colored layer 3 is formed on the base 1 using the above-described ink jet printer 10 and PC 20. The outer diameter and the inner diameter of the colored layer 3 are determined and are formed (printed) on the base 1 so that only the periphery of the intraocular lens optical section 100 (edge) is colored. Such a ring-shaped colored layer 3 is not used for suppressing blue vision, but for suppressing glare (glare) generated by the edge of the optical unit 100 and forming an artificial iris for aniridia. Used.
[0031]
For example, when used for suppressing glare of the intraocular lens, the ring width of the coloring layer 3 is such that an area of about 0.1 mm to 1 mm (the surface of the optical unit 100) is colored from the peripheral end of the optical unit 100 toward the center. What is necessary is just to be formed so that it may be performed. At this time, the color density of the colored layer 3 needs to be such that the colored area of the optical section 100 has a light-shielding property.
[0032]
When the ring-shaped colored layer 3 is used to form an iris pattern on the optical unit 100, the ring width of the colored layer 3 is preferably such that the non-colored area of the optical unit 100 is φ2.5 mm to φ5. It is formed so as to remain about 0 mm, more preferably, about 3.0 mm to 4.0 mm. At this time, the color density of the colored layer 3 may be such that the colored area of the optical unit 100 can be recognized as an iris pattern.
[0033]
Even when the optical unit 100 is colored using the ring-shaped coloring layer 3, the above-described coloring operation is performed using the vacuum vapor transfer machine 30, the coloring jig 40, and the oven 60. It is preferable that coloring is performed at least on the front surface of the optical unit 100 (the surface that becomes the front side when the intraocular lens is placed in the eye). In order to accurately perform ring-shaped coloring around the peripheral end of the optical unit 100, the optical center of the intraocular lens optical unit 100 is aligned with the center axis of the colored layer 3 on the base 1, What is necessary is just to set each to the jig 40 for coloring. In order to more accurately align the optical center of the optical unit 100 on the central axis of the coloring layer 3, a coloring jig 70 as shown in FIG. 7 may be used.
[0034]
The coloring jig 70 includes a cylindrical mounting table 71 on which a base 71 a for mounting the base 1 and a base 71 b for mounting the optical unit 100 are integrally formed, and a base holder 72. A concave portion 71c having the same diameter as the diameter of the intraocular lens optical unit 100 is provided at the center of the table 71b. By mounting the optical unit 100 in the concave portion 71c, the position of the optical unit 100 is fixed. Also, a circle having the same diameter as the outer diameter of the mounting table is printed from the center of the ring-shaped colored layer 3 on the base 1, and the circle printed on the base 1 is adjusted to the outer circumference of the mounting table 71. Thus, the base 1 is mounted on the mounting table 71. As a result, the optical center of the optical unit 100 can be located on the central axis of the colored layer 3.
[0035]
As shown in FIG. 4B, the intraocular lens optical unit 100 in which the ring-shaped coloring is performed by the vapor phase transfer method according to the present embodiment has a colored region 100a and a non-colored region 100b. After that, the support is attached to the colored optical unit 100, and the intraocular lens is completed.
[0036]
In the case of performing such ring-shaped coloring, the coloring layer 3 may be formed as a gradation such that the color density gradually decreases toward the inside. By forming the ring-shaped colored layer 3 on the substrate 1 in a gradation pattern as described above, it is possible to make the boundary between the colored region and the non-colored region unclear when the optical unit 100 is colored. Because it is possible, it is useful for improving the user's QOL (Quality of life). Further, among the colored regions of the optical unit 100, the regions that are colored in a light color by gradation are easy to transmit a light beam, so that the light amount can be secured while forming an iris pattern.
[0037]
Furthermore, the ring-shaped coloring layer 3 and the above-mentioned coloring layer for suppressing blue vision can be simultaneously formed on the base 1. By coloring the optical part 100 of the intraocular lens with such a colored layer, it is possible to suppress glare and form an artificial iris while suppressing blue vision.
[0038]
<Example>
Next, as an example, a plurality of intraocular lenses (optical portions) having different refractive powers are colored by the vapor phase transfer method of the present invention, and the transmittances thereof are compared.
[0039]
The intraocular lens material used was MMA (methyl methacrylate), a benzotriazole-based ultraviolet absorber and a very small amount of 2,2-azobisisobutyronitrile as a polymerization initiator were added, and the conventional heat polymerization method was used. An intraocular lens optical section was obtained by cutting a plate material of MMA (PMMA) which was cured into a plate shape by cutting. The diameter of the optical part was 5.5 mm, and the edge thickness at the peripheral end was 0.17 mm. Three types of intraocular lenses having a refractive power of 5D (center thickness 0.291 mm), 20D (center thickness 0.660 mm), and 40D (center thickness 1.180 mm) were prepared.
[0040]
These three types of intraocular lenses were colored by the vapor phase transfer method described above. The printer is a commercially available inkjet printer (MJ-8000C manufactured by Seiko Epson Corporation), and the sublimation ink uses three types of disperse dyes (aqueous) manufactured by Upepo (aqueous) (red, blue, and yellow). Was used to determine the hue (compounding ratio red: blue: yellow = 3: 10: 1). Similarly, the color density was adjusted to 6% output (red) using the draw software of the PC. Thereafter, based on the color data, a circle larger than the diameter of the optical part to be colored was printed on white paper (high-quality PPC paper), and this was used as a printing substrate.
[0041]
After the printing substrate was dried, the transfer operation from the printing substrate 1 to the intraocular lens optical unit 100 was performed using the above-described vacuum vapor transfer machine 30, the coloring jig 40, and the like. At this time, the degree of vacuum in the vacuum vapor transfer machine 30 was 1 kPa, the temperature on the printing substrate 1 was 250 ° C., and the dye was sublimated for 1 minute. It was confirmed that the dye was almost sublimated from the colored layer 2 of the printing substrate 1 and the dye was deposited on the optical section 100. After the transfer operation to the optical unit 100, the optical unit 100 was placed in the oven 60 for fixing, and the lens was heated at 120 ° C. for 1 hour to complete the color forming operation. Thereafter, the transmittance of all three types of intraocular lenses was measured with a spectrophotometer (U-4000, manufactured by Hitachi, Ltd.).
[0042]
FIG. 5 shows the measurement results. In FIG. 5, the horizontal axis represents wavelength and the vertical axis represents transmittance. (1) is 5.0D, (2) is 20.0D, and (3) is 40.0. When suppressing blue vision, the coloration of the intraocular lens is performed with a tint such as yellow or orange, but here, the difference in transmittance due to the difference in center thickness in any of the red, blue, and yellow wavelength ranges. In order to show that there is no color, the intraocular lens is colored using three kinds of inks of red, blue and yellow.
[0043]
<Comparative example>
As a comparative example, a conventional colored intraocular lens was prepared by kneading. The materials used and the method of forming the intraocular lens were the same as in the examples. In addition, a very small amount of a pyrazole-based yellow dye was added as a dye for kneading the material. The prepared intraocular lens (optical unit) was of three types, 5D, 20D, and 40D (the shape conditions such as the center thickness were the same as in the example) as in the example. The transmittance of the prepared optical part was measured with a spectrophotometer. FIG. 6 shows the result. In the figure, (1) 'indicates a 5D, (2)' indicates a 20D, and (3) 'indicates a 40D intraocular lens.
[0044]
<Result>
As shown in FIG. 6, in a comparative example in which a dye was kneaded to form a colored intraocular lens, a difference in transmittance was caused due to a difference in power (difference in center thickness). On the other hand, as shown in FIG. 5, in the colored intraocular lens to which the coloring method of the present invention was applied, good results were obtained in which the transmittance was substantially the same even when the center thickness was different. In addition, although the MMA is used as the material for the intraocular lenses of the examples and the comparative examples, the same result can be obtained also for the material of the bendable intraocular lens.
[0045]
【The invention's effect】
As described above, according to the coloring method of the present invention, uniform transmittance can be obtained regardless of the thickness of the intraocular lens.
[Brief description of the drawings]
FIG. 1 is a flowchart illustrating a flow of a coloring operation according to an embodiment.
FIG. 2 is a diagram schematically illustrating a coloring system according to the embodiment.
FIG. 3 is a diagram showing a configuration of a vacuum vapor transfer machine and a coloring jig used in the present embodiment.
FIG. 4 is a diagram showing a shape of a coloring layer for coloring only a peripheral end portion of an intraocular lens optical unit and an intraocular lens colored by the coloring layer.
FIG. 5 is a diagram showing the transmittance of an intraocular lens optical unit colored by an example (vapor phase transfer method).
FIG. 6 is a diagram showing the transmittance of an intraocular lens optical unit colored by a comparative example (kneading).
FIG. 7 is a diagram showing a coloring jig for coloring only the peripheral end of the optical unit.
[Explanation of symbols]
Reference Signs List 1 base 2 coloring layer 10 inkjet printer 20 personal computer 30 vacuum vapor transfer machine 40 coloring jig 60 oven 100 intraocular lens

Claims (7)

昇華性色素が含有されたインクを電子計算機にて管理された色データに基づいて基体に塗布しておき、前記インクが塗布された前記基体の塗布面を真空中に眼内レンズ光学部の着色予定面と対向させるとともに前記基体を加熱することにより前記昇華性色素を昇華させ、該昇華性色素を前記眼内レンズに付着させることにより、前記眼内レンズを着色させることを特徴とする眼内レンズの着色方法。An ink containing a sublimable dye is applied to a substrate based on color data managed by a computer, and the coated surface of the substrate on which the ink is applied is colored in a vacuum to form an optical portion of the intraocular lens. Sublimating the sublimable dye by heating the substrate while facing the predetermined surface, and coloring the intraocular lens by attaching the sublimable dye to the intraocular lens. How to color the lens. 請求項1の眼内レンズの着色方法において、前記電子計算機にて管理された色データは、着色後の眼内レンズの透過特性が人眼水晶体の透過特性に合うように考慮された色相となるような色データであることを特徴とする眼内レンズの着色方法。2. The method for coloring an intraocular lens according to claim 1, wherein the color data managed by the computer is a hue in which the transmission characteristics of the intraocular lens after coloring match the transmission characteristics of the human eye lens. A method for coloring an intraocular lens, characterized by such color data. 請求項1の眼内レンズ着色方法において、前記基体と眼内レンズ光学部とは非接触にて対向させることを特徴とする眼内レンズの染色方法。2. The method for dyeing an intraocular lens according to claim 1, wherein the substrate and the intraocular lens optical unit are opposed to each other without contact. 請求項1〜3の眼内レンズの着色方法において、前記着色された眼内レンズ全体を所定温度にて加熱することを特徴とする眼内レンズの着色方法。4. The method for coloring an intraocular lens according to claim 1, wherein the whole of the colored intraocular lens is heated at a predetermined temperature. 請求項1〜請求項4の眼内レンズの着色方法において、前記眼内レンズが着色された後、眼内レンズの眼内にて固定保持させるための支持部を前記着色済眼内レンズに取り付けることを特徴とする眼内レンズの着色方法。In the method for coloring an intraocular lens according to any one of claims 1 to 4, after the intraocular lens is colored, a support for fixing and holding the intraocular lens in the eye is attached to the colored intraocular lens. A method for coloring an intraocular lens, characterized in that: 基体上に塗布された昇華性染料を眼内レンズの着色予定面に対向して置き、前記基体を加熱することにより前記昇華性染料を昇華させて前記着色予定面に付着させた後、該昇華性染料が付着した眼内レンズを所定温度にて加熱することを特徴とする眼内レンズの着色方法。The sublimable dye applied on the substrate is placed opposite to the surface to be colored of the intraocular lens, and the substrate is heated to sublimate the sublimable dye and adhere to the surface to be colored. A method for coloring an intraocular lens, comprising heating an intraocular lens to which a sex dye has adhered at a predetermined temperature. 請求項1〜6の眼内レンズの着色方法を用いて得られることを特徴とする着色眼内レンズ。A colored intraocular lens obtained by using the method for coloring an intraocular lens according to claim 1.
JP2002288138A 2002-09-30 2002-09-30 Method of tinting intraocular lens and tinted intraocular lens obtained by the method Pending JP2004121434A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008107775A (en) * 2006-09-29 2008-05-08 Nidek Co Ltd Method of dyeing plastic lens and base body forming device for dyeing plastic lens
JP2008541798A (en) * 2005-05-05 2008-11-27 キー メディカル テクノロジーズ インコーポレイテッド Ophthalmic instruments and methods
JP2013014868A (en) * 2011-07-06 2013-01-24 Nidek Co Ltd Method for dyeing silicone molded article or polyurethane molded article
WO2016102996A1 (en) 2014-12-23 2016-06-30 Essilor International (Compagnie Générale d'Optique) Method for limiting the propagation of cracks in an optical article
EP4349580A1 (en) 2022-10-05 2024-04-10 Essilor International Apparatus and method for heat treatment of at least one lens body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008541798A (en) * 2005-05-05 2008-11-27 キー メディカル テクノロジーズ インコーポレイテッド Ophthalmic instruments and methods
JP2008107775A (en) * 2006-09-29 2008-05-08 Nidek Co Ltd Method of dyeing plastic lens and base body forming device for dyeing plastic lens
JP2013014868A (en) * 2011-07-06 2013-01-24 Nidek Co Ltd Method for dyeing silicone molded article or polyurethane molded article
WO2016102996A1 (en) 2014-12-23 2016-06-30 Essilor International (Compagnie Générale d'Optique) Method for limiting the propagation of cracks in an optical article
EP4349580A1 (en) 2022-10-05 2024-04-10 Essilor International Apparatus and method for heat treatment of at least one lens body
WO2024074570A1 (en) 2022-10-05 2024-04-11 Essilor International Apparatus and method for heat treatment of at least one lens body

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