JP2010152388A - 多焦点眼科レンズの設計方法 - Google Patents
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Abstract
【解決手段】本方法は、(i)少なくとも1つの角膜表面を数学的モデルとして特徴付けるステップと、(ii)前記数学的モデルを用いて、得られる前記角膜表面の収差を計算するステップと、(iii)前記レンズと前記少なくとも1つの角膜表面とを含む光学系から到来する波面が、少なくとも1つの焦点について低減した収差を得るように、多焦点眼科レンズをモデル化するステップと、を備える。多焦点眼内レンズを選択する方法、患者グループからの角膜データに基づいて、多焦点眼科レンズを設計する方法、および多焦点眼科レンズも開示する。
【選択図】図2
Description
2.異なる曲率半径を持つ環状のゾーン/リングを持つ屈折光学系。
本発明の目的は、先行技術の装置および方法の欠点を克服する、多焦点眼科レンズおよびこれを設計するための設計方法を提供することである。これは、請求項1または2で規定されたような方法によって達成される。
(ii)眼のモデルの色収差を決定するように、前記眼のモデルのパワーを別々の波長で評価するステップ。
(iii)眼のモデルの前記色収差についての理想的な補償となるように、パワーが波長とともにどのように変化するかを示す補正関数を評価するステップ。
(iv)パワーが波長とともにどのように変化するかを示す、前記補正関数を適切に近似する線形関数を見つけるステップ。
(v)この線形関数に対応する回折プロファイルの暫定ゾーン幅を計算して、この回折プロファイルの回折パワーも計算するステップ。
(vi)レンズの屈折パワーを、回折プロファイル用に計算したパワーの量だけ減少させるステップ。
(vii)ステップiii)の新しい補正関数を評価して、ステップiv)の新しい線形関数を見つけて、この新しい線形関数に対応する新しい回折プロファイルに関して、新しい暫定ゾーン幅および新しい回折パワーを計算するステップ。
(viii)全体パワーが所定のパワーと等しくなるように、レンズの屈折パワーを調整するステップ。
(ix)眼のモデルに所定のパワーおよび適切な色収差の低減を付与するように、ハイブリッド眼科レンズの屈折部分および回折部分の適切な組合せが見つかるまで、ステップvii)からステップviii)を繰り返すステップ。
概論:
角膜の球面収差を補正する二焦点眼内レンズ(BRAIOL)は、従来の二焦点レンズ(BIOL)をベースとして、今回の場合、ポリ(メチルメタクリレート)材料で製作された回折レンズ設計である二焦点モデル811E,ファルマシア社をベースとしてモデル化できる。このレンズのパワー追加は、読書(reading)用で+4ジオプターであり、これは3ジオプターの読書用眼鏡に相当する。この例では、シリコーン材料用に使用するように設計が適合されている。その結果、回折表面プロファイルのステップ高さは、2つの材料の低減した屈折率の比で増加させている。
一実施形態において、レンズは、前側表面および後側表面の両方で12.15mmの曲率半径および1.1mmの中心厚さを有する両凸レンズである。前側表面は、非球面化している。反復プロセスにおいて、設計角膜および二焦点IOLの光学系の収差は、遠焦点位置での波面収差、本例では球面収差を表すゼルニケ項Z11、を低減するために最適化される。このプロセスにおいて、前側レンズ表面の非球面性が設計パラメータとして用いられる。前側表面の非球面性は、円錐(conic)定数で記述される。前側表面のサグ方程式は、下記の式である。
他の実施形態において、レンズは、前側表面および後側表面の両方で12.15mmの曲率半径および1.1mmの中心厚さを有する両凸レンズである。回折後側表面は、非球面化している。反復プロセスにおいて、設計角膜および二焦点IOLの光学系の収差は、波面収差、本例では、球面収差を表すゼルニケ項Z11と対称な高次の項Z22,Z37、を低減するために最適化される。このプロセスにおいて、後側レンズ表面の非球面性が設計パラメータとして用いられる。後側表面の非球面性は、円錐(conic)定数および2次の項で記述される。全体のサグ方程式は、下記の式である。
他の実施形態において、レンズは、曲率半径12.15mmの前側表面、曲率半径12.59mmの後側表面、および1.1mmの中心厚さを有する両凸レンズである。回折プロファイルは後側表面に配置され、前側表面は非球面化している。反復プロセスにおいて、設計角膜および二焦点IOLの光学系の収差は、波面収差、本例では、球面収差を表すゼルニケ項Z11と対称な高次の項Z22,Z37、を低減するために最適化される。このプロセスにおいて、前側レンズ表面の非球面性が設計パラメータとして用いられる。前側表面の非球面性は、円錐(conic)定数および2次の項で記述される。前側表面のサグ方程式は、下記の式である。
多焦点球面眼内レンズの色補正
例示のレンズは、シリコーン材料で製作される。その形状は、等両凸(equi-biconvex)レンズである。レンズの前側表面は、非球面の屈折レンズを備え、その上に回折プロファイルが重なっている。回折プロファイルは2.0ジオプターのレンズパワーを有し、一方、非球面の屈折レンズは18.0ジオプターのレンズパワーを有する。得られるレンズパワー合計は20ジオプターである。
屈折性/回折性のIOLを含む眼モデルを評価するために、390nmから760nmの可視スペクトル上で38個の離散した波長(10nmステップ)を使用した。
Claims (15)
- 改善した多焦点眼内レンズを設計する方法であって、
回折パターンが形成された多焦点レンズを用意するステップと、
多焦点レンズおよび角膜モデルを含む光学系を用意するステップと、
光学系から由来する波面単色収差を計算するステップと、
波面単色収差を低減するように選択された非球面成分を有するように、多焦点レンズの表面を再モデル化するステップとを含み、
回折パターンは、エネルギーを多焦点レンズの第1焦点から多焦点レンズの第2焦点へ徐々にシフトさせるように構成されたアポディゼーションゾーンを含むようにした方法。 - 移植後に少なくとも1つの焦点について眼の収差を低減できる、1つの基本焦点および少なくとも1つの追加焦点を持つ多焦点眼科レンズを設計する方法であって、
(i)少なくとも1つの角膜表面を数学的モデルとして特徴付けるステップと、
(ii)前記数学的モデルを用いて、得られる前記角膜表面の収差を計算するステップと、
(iii)前記レンズと前記少なくとも1つの角膜表面とを含む光学系から到来する波面が、少なくとも1つの焦点について低減した収差を得るように、多焦点眼科レンズをモデル化するステップと、を含む方法。 - 眼科レンズは、多焦点眼内レンズである請求項1記載の方法。
- 前記角膜を通過した波面に換算して、得られる前記角膜表面の収差を決定することを含む請求項2または3記載の方法。
- トポグラフ測定を用いて個人の前側角膜表面を特徴付けることと、角膜収差を多項式の組合せとして表現することを含む請求項2〜4のいずれかに記載の方法。
- トポグラフ測定を用いて個人の前側角膜表面および後側角膜表面を特徴付けることと、全体の角膜収差を多項式の組合せとして表現することを含む請求項2〜5のいずれかに記載の方法。
- 選択した人々の角膜表面を特徴付けることと、前記人々の平均角膜収差を多項式の組合せとして表現することを含む請求項2〜6のいずれかに記載の方法。
- (vii)前記モデル化した眼内レンズおよび角膜を備える光学系から由来する収差を計算するステップと、
(iix)モデル化した眼内レンズが充分な収差低減を提供したかを決定し、必要に応じて、充分な低減が得られるまで眼内レンズを再モデル化するステップと、をさらに含む請求項2〜7のいずれかに記載の方法。 - 前記収差が、多項式の線形結合として表現される請求項8記載の方法。
- 前記多項式は、ザイデル多項式またはゼルニケ多項式である請求項9記載の方法。
- 前記モデル化した多焦点眼内レンズおよび角膜を備える光学系から由来する波面のゼルニケ係数を計算するステップと、
前記眼内レンズがゼルニケ係数の充分な低減を提供したかを決定し、必要に応じて、前記係数の充分な低減が得られるまで前記レンズを再モデル化するステップと、をさらに含む請求項10記載の方法。 - 4次を超える収差を示すゼルニケ係数を充分に低減することを含む請求項11記載の方法。
- 多焦点眼内レンズのモデル化は、レンズを、回折タイプの多焦点レンズとしてモデル化することを含む請求項2〜12のいずれかに記載の方法。
- 多焦点眼内レンズのモデル化は、二焦点レンズをモデル化することを含む請求項2〜13のいずれかに記載の方法。
- レンズは、エネルギーバランスを近焦点から遠焦点へ徐々にシフトさせるアポディゼーションゾーンを有する回折パターンを含む請求項2〜14のいずれかに記載の方法。
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KR20150120981A (ko) * | 2013-02-22 | 2015-10-28 | 가부시키가이샤 아도테크 엔지니어링 | 노광 광학계, 노광 헤드 및 노광 장치 |
TWI623817B (zh) * | 2013-02-22 | 2018-05-11 | 亞得科技工程有限公司 | 曝光光學系統、曝光頭及曝光裝置 |
KR102137428B1 (ko) | 2013-02-22 | 2020-07-24 | 가부시키가이샤 아도테크 엔지니어링 | 노광 광학계, 노광 헤드 및 노광 장치 |
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EP2113226A1 (en) | 2009-11-04 |
AU2003300516A1 (en) | 2004-06-23 |
CA2763036C (en) | 2015-03-17 |
CA2763036A1 (en) | 2004-06-17 |
US7543937B2 (en) | 2009-06-09 |
DE60327830D1 (de) | 2009-07-16 |
US7377641B2 (en) | 2008-05-27 |
AU2003300516B2 (en) | 2009-08-06 |
US20170224474A1 (en) | 2017-08-10 |
ATE432674T1 (de) | 2009-06-15 |
US10085833B2 (en) | 2018-10-02 |
US20190029808A1 (en) | 2019-01-31 |
EP1424049B1 (en) | 2009-06-03 |
TWI338166B (en) | 2011-03-01 |
CA2507659A1 (en) | 2004-06-17 |
EP2363097B1 (en) | 2012-09-26 |
JP2006519031A (ja) | 2006-08-24 |
EP2363097A1 (en) | 2011-09-07 |
US20080198326A1 (en) | 2008-08-21 |
CA2507659C (en) | 2012-03-13 |
US20060244906A1 (en) | 2006-11-02 |
SE0203564D0 (sv) | 2002-11-29 |
TW200426424A (en) | 2004-12-01 |
WO2004049979A1 (en) | 2004-06-17 |
ES2325988T3 (es) | 2009-09-28 |
EP1424049A1 (en) | 2004-06-02 |
EP2113226B1 (en) | 2012-07-25 |
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