JP4363573B2 - Multifocal lens - Google Patents
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- JP4363573B2 JP4363573B2 JP2005357629A JP2005357629A JP4363573B2 JP 4363573 B2 JP4363573 B2 JP 4363573B2 JP 2005357629 A JP2005357629 A JP 2005357629A JP 2005357629 A JP2005357629 A JP 2005357629A JP 4363573 B2 JP4363573 B2 JP 4363573B2
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この発明はコンタクトレンズや眼内レンズなどとして使用されるマルチフォーカルレンズに関し、特に遠近両用の老眼用コンタクトレンズや眼内レンズに適用して有効なものに関する。 The present invention relates to a multifocal lens used as a contact lens, an intraocular lens, and the like, and more particularly, to an effective one when applied to a bilateral presbyopia contact lens or an intraocular lens.
マルチフォーカルレンズでは、一つのレンズ光学部に遠方を見るための遠用部と近方を見るための近用部が配置されるようにレンズの度数が分布される。その度数分布は、従来の場合、たとえば特開平２−２４０６２５号公報や特開平５−１８１０９６号公報に開示されているように、一次関数や二次関数等の低次数の関数、または高次数の多項式によって定義されていた。 In the multifocal lens, the lens power is distributed so that a distance portion for viewing the distance and a near portion for viewing the near are arranged in one lens optical unit. In the conventional case, the frequency distribution is a low-order function such as a linear function or a quadratic function, or a high-order function, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-240625 and Japanese Patent Application Laid-Open No. 5-181096. It was defined by a polynomial.
しかしながら、一次関数や二次関数等の低次数の関数では変化率が大きく、あるいは変化状態が粗く、この関数によってレンズの度数分布を定めると、レンズの度数が大きく変動して、安定した遠用度数領域や近用度数領域を確保することができない。この結果、遠用部や近用部にて安定した視力が確保できない、という問題が生じる。 However, in low-order functions such as linear functions and quadratic functions, the rate of change is large or the state of change is rough. When the power distribution of the lens is determined by this function, the power of the lens fluctuates greatly and stable distance use is achieved. The frequency area and the near-use frequency area cannot be secured. As a result, there arises a problem that stable visual acuity cannot be secured in the distance portion and the near portion.
高次数の多項式では、安定した遠用度数領域や近用度数領域を確保することができるものの、高次数の多項式に現れる振動現象によって、度数の変化に微小な振動が伴うようになってしまう。この結果、コントラストや視野のロスが増えるといった問題が生じる。 Although a high-order polynomial can secure a stable distance power range and near power range, a minute vibration is accompanied by a change in power due to a vibration phenomenon appearing in the high-order polynomial. As a result, there arises a problem that contrast and visual field loss increase.
この発明は、以上のような問題に鑑みてなされたもので、その目的は、レンズの度数分布が安定した遠用度数領域や近用度数領域を確保するとともに、その度数を振動を伴わずに滑らかに変化させることを可能にして、遠用と近用の両方に明瞭な視界を得ることができるマルチフォーカルレンズを提供することにある。 The present invention has been made in view of the above problems, and its purpose is to secure a distance power range and a near power range in which the power distribution of the lens is stable, and the power without vibration. An object of the present invention is to provide a multifocal lens that can be changed smoothly and can obtain a clear field of view for both distance and near vision.
上述の課題を解決する手段として、第１の手段は、As means for solving the above problems, the first means is:
レンズ光学部に遠方を見るための遠用部と近方を見るための近用部とが配置されるようにレンズ光学部の度数が分布されるマルチフォーカルレンズであって、A multifocal lens in which the power of the lens optical unit is distributed so that a distance unit for viewing the distance and a near unit for viewing the near are arranged in the lens optical unit,
レンズ光学部の中心部に遠用部を配置するとともに、前記レンズ光学部の周辺部に近用部を配置し、前記レンズ光学部の中心点から前記レンズ光学部の最外周点まで変化するパワー分布をＰｏｗｅｒＤｉｓｔとしたとき、前記ＰｏｗｅｒＤｉｓｔは、下記（１）式で表されるものであり、前記レンズ光学部の中心におけるパワーをＰ−Ｐｏｗｅｒとし、前記レンズ光学部の中心点と前記レンズ光学部の最外周点とのパワー差をＭａｘ−ａｄｄとし、前記遠用部と前記近用部との境界であって、前記（１）式で表されるパワー分布曲線の変曲点をＢｎｆとし、下記（１）のパワー変化をＷａｖｅとし、A power that varies from the center point of the lens optical unit to the outermost peripheral point of the lens optical unit, with a distance unit disposed at the center of the lens optical unit and a near unit disposed at the periphery of the lens optical unit. When the distribution is PowerDist, the PowerDist is expressed by the following equation (1), the power at the center of the lens optical unit is P-Power, the center point of the lens optical unit and the lens optical unit The power difference from the outermost peripheral point is Max-add, the boundary between the distance portion and the near portion, and the inflection point of the power distribution curve represented by the equation (1) is Bnf, The power change in (1) below is Wave,
前記レンズ光学部中心点からの距離をｘとするとき、When the distance from the lens optical unit center point is x,
−２５Ｄ≦Ｐ−Ｐｏｗｅｒ≦２５Ｄ，０Ｄ＜Ｍａｘ−Ａｄｄ≦５．００Ｄおよび２≦Ｗａｖｅ≦６の条件を満足し、−25D ≦ P-Power ≦ 25D, 0D <Max-Add ≦ 5.00D and 2 ≦ Wave ≦ 6 are satisfied,
前記Ｂｎｆにおける前記レンズ光学部中心点から径方向へ距離が０．５ｍｍ≦Ｂｎｆ≦３ｍｍの条件を満足することを特徴とするマルチフォーカルレンズである。The multifocal lens is characterized in that a distance in the radial direction from the lens optical portion center point in the Bnf satisfies a condition of 0.5 mm ≦ Bnf ≦ 3 mm.
前記（１）式並びに下記（２）式および（３）式において、In the formula (1) and the following formulas (2) and (3),
前記レンズ光学部の中心点から半径ｃ／２ｍｍの円内に設定された領域における平均度数を中心パワーとし、前記レンズ光学部の中心点から半径ｐ１／２ｍｍの円と半径ｐ２／２ｍｍの円とで囲まれた領域における平均度数を周辺パワーとし、前記Ｂｎｆ，前記Ｗａｖｅ，前記中心パワー，前記周辺パワー，前記ｃ，前記ｐ１および前記ｐ２が処方されるとき、An average power in a region set within a circle having a radius of c / 2 mm from the center point of the lens optical unit is defined as a center power, and a circle having a radius of p1 / 2 mm and a circle having a radius of p2 / 2 mm from the center point of the lens optical unit. When the average power in the region surrounded by the peripheral power is the peripheral power, and the Bnf, the Wave, the central power, the peripheral power, the c, the p1, and the p2 are prescribed,
０．５ｍｍ≦ｃ≦３．５ｍｍ並びに２．５ｍｍ≦ｐ１およびｐ２≦８ｍｍの条件を満たすことを特徴とする請求項１に記載のマルチフォーカルレンズである。The multifocal lens according to claim 1, wherein the conditions of 0.5 mm ≦ c ≦ 3.5 mm and 2.5 mm ≦ p1 and p2 ≦ 8 mm are satisfied.
第１の手段において、レンズの度数分布を（１）式のような正接曲線によって定めたことにより、安定した遠用度数領域と近用度数領域を確保することができるとともに、その度数を振動を伴わずに滑らかに変化させることができるようになる。また、各係数を第１の手段の範囲とすることにより、遠用、中用及び近用においてコントラストロスの少ない明瞭な視界が得られるレンズを得ることができる。In the first means, the power distribution of the lens is determined by a tangent curve such as the expression (1), so that a stable distance power area and a near power area can be secured, and the power is vibrated. It becomes possible to change smoothly without being accompanied. In addition, by setting each coefficient within the range of the first means, it is possible to obtain a lens that can provide a clear field of view with little contrast loss in distance use, medium use, and near use.
また、遠用及び近用において良好な視界の得られるレンズを得られ、特に、遠用と中用から近用にかけた部分において良好な視界の得られるレンズを得ることができる。Further, it is possible to obtain a lens capable of obtaining a good field of view for distance and near use, and in particular, it is possible to obtain a lens capable of obtaining a good field of view from a distance range and a middle range to a near range.
また、第２の手段により、処方値から比較的簡単に（１）式の係数を定めることができ、最適な度数分布を能率よく求めることができる。In addition, the second means makes it possible to determine the coefficient of the formula (1) relatively easily from the prescription value, and the optimum frequency distribution can be obtained efficiently.
以上説明したように、本発明のマルチフォーカルレンズは、レンズ光学部に遠方を見るための遠用部と近方を見るための近用部が配置される累進多焦点のコンタクトレンズや眼内レンズにおいて、そのレンズの度数分布を正接曲線にしたがって定めることにより、安定した遠用度数領域、中用度数領域及び近用度数領域を確保することができるとともに、その度数を振動を伴わずに滑らかに変化させることができ、これにより、遠用と近用の両方にコントラストロスの少ない明瞭な視界を得ることができる。また、その正接曲線による度数分布の表現は、前述したように、単一の式で比較的簡単に行うことができる。 As described above, the multifocal lens of the present invention is a progressive multifocal contact lens or intraocular lens in which a distance portion for viewing the distance and a near portion for viewing the near are arranged in the lens optical unit. Therefore, by determining the power distribution of the lens according to the tangent curve, it is possible to secure a stable distance power area, medium power area, and near power area, and smooth the power without vibration. This makes it possible to obtain a clear field of view with little contrast loss for both distance and near vision. In addition, as described above, the expression of the frequency distribution by the tangent curve can be relatively easily performed by a single expression.
図１は本発明の第１の実施の形態にかかるマルチフォーカルレンズの説明図である。図１に示すレンズはコンタクトレンズとして構成され、１はレンズ光学部、２は光学部中心、３は周辺のフランジ部をそれぞれ示す。レンズ光学部１は光学部中心２を中心として回転対象形に形成されている。 FIG. 1 is an explanatory diagram of a multifocal lens according to a first embodiment of the present invention. The lens shown in FIG. 1 is configured as a contact lens. Reference numeral 1 denotes a lens optical part, 2 denotes an optical part center, and 3 denotes a peripheral flange part. The lens optical unit 1 is formed in a shape to be rotated around the optical unit center 2.
図２は、図１のＡ−Ａ位置におけるレンズの度数分布状態を示す。
同図において、横軸は光学部中心２からの距離ｘ（ｍｍ）、縦軸は度数ＰｏｗｅｒＤｉｓｔ（Ｄ）を示す。なお、この度数分布は、レンズ光学部１が光学部中心２を中心とする回転対称形に形成されていることにより、Ａ−Ａ位置以外の任意の半径方向において同じである。
FIG. 2 shows the power distribution state of the lens at the position AA in FIG.
In the figure, the horizontal axis represents the distance x (mm) from the optical unit center 2, and the vertical axis represents the frequency PowerDist (D). This frequency distribution is the same in any radial direction other than the AA position because the lens optical unit 1 is formed in a rotationally symmetric shape with the optical unit center 2 as the center .
ここで、同図に示すレンズの度数分布は、上述の（１）式にしたがって定められている。この場合、この（１）式の各係数は、次のようにして定める。すなわち、上述の（１）式、（２）式及び（３）式において、Ｂｎｆ、Ｗａｖｅ、中心パワー、周辺パワー、ｃ、ｐ１、ｐ２の各値は、レンズ装用者の眼の処方から定まる遠用度数や近用度数等によって定まる。したがって、（２）式及び（３）より、これら式を満すＰ−Ｐｏｗｅｒ及びＭａｘ−Ａｄｄの値が求められ、（１）式のＰｏｗｅｒＤｉｓｔをｘのみの関数として表すことができる。 Here, the power distribution of the lens shown in the figure is determined according to the above-described equation (1). In this case, each coefficient of the equation (1) is determined as follows. That is, in the above formulas (1), (2), and (3), the values of Bnf, Wave, center power, peripheral power, c, p 1 , and p 2 are determined from the prescription of the eye of the lens wearer. It is determined by the distance power or near power that is determined. Therefore, the values of P-Power and Max-Add satisfying these equations are obtained from the equations (2) and (3), and the PowerDist of the equation (1) can be expressed as a function of only x.
図２の度数分布曲線は、（１）式、（２）式及び（３）式において、Ｂｎｆ＝１．２５、Ｗａｖｅ＝５、中心パワー＝−２．９７（Ｄ）、周辺パワー＝−１．８８（Ｄ）、ｃ＝１．００（ｍｍ）、ｐ１＝３．００（ｍｍ）、ｐ２＝３．５（ｍｍ）とし、Ｐ−Ｐｏｗｅｒ＝−３．００（Ｄ）、Ｍａｘ−Ａｄｄ＝＋１．５０（Ｄ）として求めた場合の曲線である。なお、ｃ、ｐ１、ｐ２は、次のようにも定義することができる。
ｃ（φｍｍ）：中心パワー領域（“中心遠用−周辺近用”の累進多焦点なら、ｃ遠用部領域）
ｐ１（φｍｍ）：周辺パワー領域の内径（“中心遠用−周辺近用”の累進多焦点なら、近用部領域の内径）
ｐ２（φｍｍ）：周辺パワー領域の外径（“中心遠用−周辺近用”の累進多焦点なら、近用部領域の外径）
The frequency distribution curve of FIG. 2 is obtained by using Bnf = 1.25, Wave = 5, center power = −2.97 (D), and peripheral power = −1 in the equations (1), (2), and (3). .88 (D), c = 1.00 (mm), p 1 = 3.00 (mm), p 2 = 3.5 (mm), P-Power = −3.00 (D), Max− This curve is obtained when Add = + 1.50 (D). Note that c, p 1 and p 2 can also be defined as follows.
c (φ mm): Center power region (if the progressive multifocal of “central distance-periphery”, c distance portion region)
p 1 (φmm): inner diameter of the peripheral power region (in the case of progressive multifocal for “center distance-periphery near”, the inner diameter of the near portion area)
p 2 (φmm): outer diameter of the peripheral power region (in the case of progressive multifocal for “center distance-periphery near”, the outer diameter of the near portion region)
このレンズでは、中心部に遠用部、周辺部に近用部が配置されているが、同図からもわかるように、安定した遠用度数領域と近用度数領域が確保されている。また、度数は振動を伴わずに滑らかに変化している。これにより、遠用と近用の両方にコントラストロスの少ない明瞭な視界を得ることができる。
なお、上記実施形態はコンタクトレンズであるが、眼内レンズ等についても同様の効果を得ることができる。
In this lens, the distance portion is disposed at the center and the near portion is disposed at the peripheral portion. As can be seen from the figure, a stable distance power region and near power region are secured. Also, the frequency changes smoothly without vibration . As a result, it is possible to obtain a clear field of view with little loss of contrast for both distance use and near use.
In addition, although the said embodiment is a contact lens, the same effect can be acquired also about an intraocular lens etc.
なお、第１の実施の形態のように、いわゆる遠近用のレンズを構成するには、Ｍａｘ−Ａｄｄ、Ｂｎｆ、Ｗａｖｅの値を下記の範囲内で定めることにより、良好な視界の得られるレンズを得ることができる。
５．００Ｄ≦｜Ｍａｘ−Ａｄｄ｜
１．０ｍｍ≦Ｂｎｆ≦１．５ｍｍ
４≦Ｗａｖｅ≦６
In order to construct a so-called perspective lens as in the first embodiment, a lens that provides a good field of view can be obtained by determining the values of Max-Add, Bnf, and Wave within the following ranges. Obtainable.
5.00D ≦ | Max-Add |
1.0mm ≦ Bnf ≦ 1.5mm
4 ≦ Wave ≦ 6
図３は本発明の第２の実施形態によるレンズの度数分布状態を示す。この度数分布も上述の第１の実施の形態の場合と同様にして係数を決定した（１）式による分布である。図３の度数分布曲線は、（１）式、（２）式及び（３）式において、Ｂｎｆ＝２．００、Ｗａｖｅ＝３、中心パワー＝−２．９８（Ｄ）、周辺パワー＝−２．７１（Ｄ）、ｃ＝１．０（ｍｍ）、ｐ１＝３．０（ｍｍ）、ｐ２＝４．０（ｍｍ）とし、Ｐ−Ｐｏｗｅｒ＝−３．００（Ｄ）、Ｍａｘ−Ａｄｄ＝＋１．００（Ｄ）として求めた場合の曲線である。 FIG. 3 shows a power distribution state of a lens according to the second embodiment of the present invention. This frequency distribution is also a distribution according to equation (1) in which the coefficients are determined in the same manner as in the first embodiment. The frequency distribution curve of FIG. 3 is obtained by using Bnf = 2.00, Wave = 3, center power = −2.98 (D), and peripheral power = −2 in the expressions (1), (2), and (3). .71 (D), c = 1.0 (mm), p 1 = 3.0 (mm), p 2 = 4.0 (mm), P-Power = −3.00 (D), Max− It is a curve at the time of calculating | requiring as Add = + 1.00 (D).
このレンズでは、レンズ中心部の遠用部が広く、加入度数が低くなっている。これにより、このレンズは近用部が中用部（中間距離用）としても用いられ、遠用と中用から近用にかけた部分を重視した度数分布となっている。したがって、まだ老視に至っておらず、近業における調節力としては特に不足はないものの、スポーツ、デスクワーク、ＯＡ作業等の中間位置から近用までの調節力の負担を軽減し、長時間の近業作用によって、眼の疲れを主とした諸症状を軽減するものである。また、比較的遠用光学面が大きく取ってあるため、遠近両用累進多焦点レンズに見られる夜間の光のにじみなども起こりにくいと考えられる。
この実施形態のレンズの場合も、前記実施形態と同様、安定した遠用度数領域と近用度数領域が確保されるとともに、度数が振動を伴わずに滑らかに変化している。
In this lens, the distance portion at the center of the lens is wide and the addition power is low. As a result, in this lens, the near portion is also used as the middle portion (for the intermediate distance), and has a power distribution that emphasizes the distance and the portion from the middle portion to the near portion. Therefore, although it has not yet reached presbyopia and there is no particular shortage of adjustment power in near work, it reduces the burden of adjustment power from intermediate positions to near use, such as sports, desk work, OA work, etc. It reduces various symptoms, mainly eye fatigue, through business operations. In addition, since the optical surface for far distances is relatively large, it is considered that nighttime light blurs and the like seen in a progressive multifocal lens for both perspectives are unlikely to occur.
Also in the case of the lens of this embodiment, a stable distance power region and a near power region are secured as in the above embodiment, and the power smoothly changes without vibration.
なお、第２の実施の形態のように、遠用と中用から近用にかけた部分を重視した度数分布となったレンズを構成するには、Ｍａｘ−Ａｄｄ、Ｂｎｆ、Ｗａｖｅの値を下記の範囲内で定めることにより、良好な視界の得られるレンズを得ることができる。
０．２５Ｄ≦｜Ｍａｘ−Ａｄｄ｜≦１．７５Ｄ
１．５ｍｍ≦Ｂｎｆ≦２ｍｍ
３≦Ｗａｖｅ≦４
As in the second embodiment, in order to construct a lens having a power distribution that places importance on the part from the distance and the middle to the near, the values of Max-Add, Bnf, and Wave are set as follows: By determining within the range, it is possible to obtain a lens with a good field of view.
0.25D ≦ | Max-Add | ≦ 1.75D
1.5mm ≦ Bnf ≦ 2mm
3 ≦ Wave ≦ 4
図４は本発明の第３の実施形態によるレンズの度数分布状態を示す。この度数分布も上述の第１の実施の形態の場合と同様にして係数を決定した（１）式による分布である。図４の度数分布曲線は、（１）式、（２）式及び（３）式において、Ｂｎｆ＝１．２５、Ｗａｖｅ＝３、中心パワー＝＋２．９５（Ｄ）、周辺パワー＝＋２．０６（Ｄ）、ｃ＝１．０（ｍｍ）、ｐ１＝３．０（ｍｍ）、ｐ２＝３．５（ｍｍ）とし、Ｐ−Ｐｏｗｅｒ＝＋３．００（Ｄ）、Ｍａｘ−Ａｄｄ＝−１．５０（Ｄ）として求めた場合の曲線である。 FIG. 4 shows a power distribution state of a lens according to the third embodiment of the present invention. This frequency distribution is also a distribution according to equation (1) in which the coefficients are determined in the same manner as in the first embodiment. The frequency distribution curve of FIG. 4 is obtained by using Bnf = 1.25, Wave = 3, center power = + 2.95 (D), and peripheral power = + 2.06 in the formulas (1), (2), and (3). (D), c = 1.0 (mm), p 1 = 3.0 (mm), p 2 = 3.5 (mm), P-Power = + 3.00 (D), Max-Add = − It is a curve at the time of calculating | requiring as 1.50 (D).
このレンズでは、レンズ中心部に近用部が形成され、レンズ周辺部に遠用部が形成されている。このように、この実施形態では、上述の第１の実施の形態において、上記（１）式のＭａｘ−Ａｄｄにマイナス符号部をつけることで、遠用部と近用部の配置を逆転させた例である。 In this lens, a near portion is formed at the center of the lens, and a far portion is formed at the periphery of the lens. Thus, in this embodiment, the arrangement of the distance portion and the near portion is reversed by attaching a minus sign portion to Max-Add in the above formula (1) in the above-described first embodiment. It is an example.
図５は本発明の第４の実施形態によるレンズの度数分布状態を示す。この度数分布も上述の第１の実施の形態の場合と同様にして係数を決定した（１）式による分布である。図５の度数分布曲線は、（１）式、（２）式及び（３）式において、Ｂｎｆ＝１．２５、Ｗａｖｅ＝５、中心パワー＝−３．０Ｄ、周辺パワー＝−１．５Ｄ、ｃ＝０．５ｍｍ、ｐ１＝３．０ｍｍ、ｐ２＝４．０ｍｍとし、Ｐ−Ｐｏｗｅｒ＝−３．０５Ｄ、Ｍａｘ−Ａｄｄ
＝＋１．９７Ｄとして求めた場合の曲線である。
FIG. 5 shows a power distribution state of a lens according to the fourth embodiment of the present invention. This frequency distribution is also a distribution according to equation (1) in which the coefficients are determined in the same manner as in the first embodiment. The frequency distribution curve of FIG. 5 is expressed by the following equations (1), (2), and (3): Bnf = 1.25, Wave = 5, center power = −3.0D, peripheral power = −1.5D, c = 0.5 mm, p 1 = 3.0 mm, p 2 = 4.0 mm, P-Power = −3.05D, Max-Add
= + 1.97D is a curve obtained.
このレンズはレンズ中心部に遠用部が形成され、レンズ周辺部に近用部が形成されたもので、遠近ではあるが、特に近用での視界を広く確保してる。レンズ中心部に近用部、周辺部に遠用部が配置されるレンズの場合は、上記の場合と逆に、中心パワーを近用度数に、周辺パワーを近用度数に設定する。 This lens has a distance portion formed at the center of the lens and a near portion formed at the periphery of the lens, and although it is far and near, it has a wide field of view especially for near vision. In the case of a lens in which the near portion is disposed at the center of the lens and the far portion is disposed at the periphery, the center power is set to the near power and the peripheral power is set to the near power contrary to the above case.
なお、（１）式の各係数であるＰ−Ｐｏｗｅｒ、Ｍａｘ−Ａｄｄ、Ｂｎｆ、Ｗａｖｅの値を下記の範囲内に設定すれば、遠近レンズや遠用と中用から近用にかけた部分を重視した度数分布となったレンズのいずれのレンズでも良好な視界が得られることが確認されている。
−２５Ｄ≦Ｐ−Ｐｏｗｅｒ≦＋２５Ｄ
−５Ｄ≦Ｍａｘ−Ａｄｄ≦＋５Ｄ
０．５ｍｍ≦Ｂｎｆ≦３ｍｍ
２≦Ｗａｖｅ≦１０
If the values of P-Power, Max-Add, Bnf, and Wave, which are the coefficients of equation (1), are set within the following ranges, focus on the perspective lens and the portion from the distance and the middle to the near are important. It has been confirmed that a good field of view can be obtained with any lens having a frequency distribution.
−25D ≦ P-Power ≦ + 25D
−5D ≦ Max−Add ≦ + 5D
0.5mm ≦ Bnf ≦ 3mm
2 ≦ Wave ≦ 10
次に、種々の処方について、本発明にかかるコンタクトレンズを実際に作製し、装用感をテストした結果を以下に示す。図６は４人の被験者について本発明にかかるコンタクトレンズを装用する前の裸眼又は従来の単焦点コンタクトレンズ（ＣＬ）を装用したときの見え方等を調べた結果を表−１として示した図である。また、図７は図６の表の４人の被験者について本発明にかかるコンタクトレンズを装用した後の見え方等を調べた結果を示す表−２として示した図である。さらに、図８は図７の表の４人の被験者が装用した本発明にかかるコンタクトレンズの度数分布を表す（１）式の係数を表−３として示した図である。 Next, the results of actually producing contact lenses according to the present invention and testing the feeling of wearing for various prescriptions are shown below. FIG. 6 is a table 1 showing the results of examining the appearance, etc. when wearing the naked eye or the conventional single-focus contact lens (CL) before wearing the contact lens according to the present invention for four subjects. It is. FIG. 7 is a view shown as Table 2 showing the results of examining the appearance and the like after wearing the contact lens according to the present invention for the four subjects in the table of FIG. Further, FIG. 8 is a table showing the coefficients of the formula (1) representing the frequency distribution of the contact lens according to the present invention worn by the four subjects in the table of FIG. 7 as Table-3.
なお、図６〜図８において、「１−Ｒ」は、第１の被験者の右眼、「１−Ｌ」は左眼であり、以下、第２〜第４の被験者も同様である。また、各被験者が装用したレンズは、図７の表−２にその対応関係を示したとおり、「１−Ｒ」は「Ｎｏ．１」のレンズ、「１−Ｌ」は「Ｎｏ．２」のレンズというように、それぞれ対応する。 6 to 8, “1-R” is the right eye of the first subject, “1-L” is the left eye, and the same applies to the second to fourth subjects. In addition, as shown in Table 2 of FIG. 7, the lenses worn by each subject are “No. 1” lenses and “1-L” are “No. 2” as shown in Table-2. This corresponds to each lens.
図９〜図１２はそれぞれ「Ｎｏ．２」、「Ｎｏ．４」、「Ｎｏ．６」、「Ｎｏ．８」のレンズの度数分布を示す図である。また、図１３〜図１６はそれぞれ「Ｎｏ．２」、「Ｎｏ．４」、「Ｎｏ．６」、「Ｎｏ．８」のレンズの度数分布を立体的に示す図である。 9 to 12 are diagrams showing the frequency distribution of the lenses of “No. 2”, “No. 4”, “No. 6”, and “No. 8”, respectively. 13 to 16 are three-dimensional diagrams showing the power distribution of the lenses of “No. 2”, “No. 4”, “No. 6”, and “No. 8”, respectively.
上述の結果から明らかなように、本発明のマルチフォーカルレンズによれば、従来の単焦点レンズに比較して近方及び遠方視力に優れ、かつ、度数の振動を滑らかに変化させることと遠用と中用から近用にかけた部分を重視した度数分布にすることにより、眼の疲れ、痛み、かすみ、羞明、充血、流涙、肩凝り、悪心といった眼精疲労の軽減がみられた。 As is clear from the above results, according to the multifocal lens of the present invention, the near and far vision is superior to the conventional single focus lens, and the vibration of the power is smoothly changed and the distance is reduced. By making the frequency distribution with emphasis on the part from middle to near use, reduction of eye strain such as eye fatigue, pain, haze, lightness, redness, tearing, stiff shoulders, nausea, etc. was observed.
１ マルチフォーカルレンズのレンズ光学部
２ レンズ光学中心
３ 周辺のフランジ部
1 Lens optical part of multifocal lens 2 Lens optical center 3 Peripheral flange part
Claims (2)
レンズ光学部の中心部に遠用部を配置するとともに、前記レンズ光学部の周辺部に近用部を配置し、
前記レンズ光学部の中心点から前記レンズ光学部の最外周点まで変化するパワー分布をＰｏｗｅｒＤｉｓｔとしたとき、前記ＰｏｗｅｒＤｉｓｔは、下記（１）式で表されるものであり、前記レンズ光学部の中心におけるパワーをＰ−Ｐｏｗｅｒとし、前記レンズ光学部の中心点と前記レンズ光学部の最外周点とのパワー差をＭａｘ−ａｄｄとし、前記遠用部と前記近用部との境界であって、前記（１）式で表されるパワー分布曲線の変曲点をＢｎｆとし、下記（１）のパワー変化をＷａｖｅとし、
前記レンズ光学部中心点からの距離をｘとするとき、
−２５Ｄ≦Ｐ−Ｐｏｗｅｒ≦２５Ｄ，０Ｄ＜Ｍａｘ−Ａｄｄ≦５．００Ｄおよび２≦Ｗａｖｅ≦６の条件を満足し、
前記Ｂｎｆにおける前記レンズ光学部中心点から径方向へ距離が０．５ｍｍ≦Ｂｎｆ≦３ｍｍの条件を満足することを特徴とするマルチフォーカルレンズ。
A distance portion is disposed at the center of the lens optical portion, and a near portion is disposed at the periphery of the lens optical portion,
When the power distribution changing from the center point of the lens optical unit to the outermost peripheral point of the lens optical unit is defined as PowerDist, the PowerDist is expressed by the following formula (1), and the center of the lens optical unit P-Power is the power difference between the central point of the lens optical part and the outermost peripheral point of the lens optical part is Max-add, and is a boundary between the distance part and the near part, The inflection point of the power distribution curve represented by the equation (1) is Bnf, and the power change in the following (1) is Wave.
When the distance from the lens optical unit center point is x,
−25D ≦ P-Power ≦ 25D, 0D <Max-Add ≦ 5.00D and 2 ≦ Wave ≦ 6 are satisfied,
A multifocal lens characterized in that a distance in the radial direction from the center of the lens optical part at Bnf satisfies a condition of 0.5 mm ≦ Bnf ≦ 3 mm .
前記レンズ光学部の中心点から半径ｃ／２ｍｍの円内に設定された領域における平均度数を中心パワーとし、前記レンズ光学部の中心点から半径ｐ １ ／２ｍｍの円と半径ｐ ２ ／２ｍｍの円とで囲まれた領域における平均度数を周辺パワーとし、前記Ｂｎｆ，前記Ｗａ
ｖｅ，前記中心パワー，前記周辺パワー，前記ｃ，前記ｐ １ および前記ｐ ２ が処方されるとき、
０．５ｍｍ≦ｃ≦３．５ｍｍ並びに２．５ｍｍ≦ｐ １ およびｐ ２ ≦８ｍｍの条件を満たすことを特徴とする請求項１に記載のマルチフォーカルレンズ。
Wherein the center point of the lens optical zone centered power to mean power in the area set in a circle of radius c / 2 mm, the circle and the radius p 2/2 mm of the radius p 1/2 mm from the center point of the lens optic portion The average power in the area surrounded by the circle is defined as the peripheral power, and the Bnf, Wa
When ve, the center power, the peripheral power, the c, the p 1 and the p 2 are prescribed,
The multifocal lens according to claim 1, wherein the conditions of 0.5 mm ≦ c ≦ 3.5 mm and 2.5 mm ≦ p 1 and p 2 ≦ 8 mm are satisfied .
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