JPH01291857A - In-eyeball two-focal point artificial crystalline lens - Google Patents
In-eyeball two-focal point artificial crystalline lensInfo
- Publication number
- JPH01291857A JPH01291857A JP12239588A JP12239588A JPH01291857A JP H01291857 A JPH01291857 A JP H01291857A JP 12239588 A JP12239588 A JP 12239588A JP 12239588 A JP12239588 A JP 12239588A JP H01291857 A JPH01291857 A JP H01291857A
- Authority
- JP
- Japan
- Prior art keywords
- shortsighted
- lens
- longsighted
- optical lens
- area ratio
- 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
Links
- 210000000695 crystalline len Anatomy 0.000 title description 39
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 208000001491 myopia Diseases 0.000 abstract description 30
- 210000001747 pupil Anatomy 0.000 abstract description 9
- 206010020675 Hypermetropia Diseases 0.000 abstract 6
- 230000000007 visual effect Effects 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 210000001525 retina Anatomy 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 208000002177 Cataract Diseases 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1613—Intraocular lenses having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の利用分野］
本発明は、瞳孔を覆う透明な材料からなる光学的レンズ
部分を含む二焦点の眼球内人工水晶体に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bifocal intraocular artificial lens that includes an optical lens portion of a transparent material that covers the pupil.
［従来技術とその問題点］
白内障治療として混濁した水晶体を取り出し、人工水晶
体を移植する方法が急速に普及してきた。[Prior art and its problems] A method of removing a cloudy crystalline lens and implanting an artificial crystalline lens as a cataract treatment has rapidly become popular.
しかし、人工水晶体は自然水晶体のようにその厚みを調
節し屈折力を変化できないので、日常生活を送るには近
視野用帯域又は遠視野用帯域の眼鏡レンズを別途用意す
る必要ｈ（あった。However, unlike the natural crystalline lens, the artificial crystalline lens cannot adjust its thickness and change its refractive power, so it is necessary to separately prepare spectacle lenses for near-vision or far-vision in daily life.
この欠点を改善するものとして、特開昭６０−８５７４
４号公報には二焦点人工水晶体が提案されている。To improve this drawback, Japanese Patent Application Laid-Open No. 60-8574
Publication No. 4 proposes a bifocal artificial lens.
これを第３図に示す。This is shown in FIG.
第１図において１は光学的レンズ部分、２はレンズ周辺
部である。３は穿孔、４は支持柄である。In FIG. 1, 1 is an optical lens portion, and 2 is a peripheral portion of the lens. 3 is a perforation, and 4 is a support handle.
モして５は遠視野用帯域（遠用部）、６は近視野用帯域
（近用部）であり、それぞれの帯域はレンズの軸を中心
に同心円状に配置されている。また、遠用部５及び近用
部６は、はぼ等しい面積比でおることを特徴としている
。Furthermore, 5 is a far-field zone (distance zone), and 6 is a near-field zone (near zone), and each zone is arranged concentrically around the axis of the lens. Furthermore, the distance vision section 5 and the near vision section 6 are characterized in that they have approximately the same area ratio.
ところで、二焦点人工水晶体においては遠用部と近用部
の面積比が等しいという条件は重要である。なぜなら人
工水晶体においては多焦点眼鏡レンズと異なり、眼に入
射する光束は人工水晶体の連用部、近用部の両方を通過
するため網膜上に両方の像を形成し、脳においてどちら
か一方の像を選択するのである。従って、両者の像間に
著しい光量差が存在する場合には、暗い方の像を知覚す
ることは４重めで困難となる。By the way, in a bifocal artificial lens, the condition that the area ratio of the distance vision part and the near vision part is equal is important. This is because, unlike multifocal eyeglass lenses, with an artificial crystalline lens, the light beam that enters the eye passes through both the continuous and near vision parts of the artificial lens, forming both images on the retina, and only one image in the brain. choose. Therefore, if there is a significant difference in light amount between the two images, it will be difficult to perceive the darker image because it is quadrupled.
前記特開昭６０−８５７４４号公報により開示された二
点点人工水晶体は上記した問題点を解決している。The two-point artificial crystalline lens disclosed in Japanese Patent Application Laid-Open No. 60-85744 solves the above-mentioned problems.
ところが、外部の明るさの変化により瞳孔が変化したと
き、連用部と近用部の面積比が著しく変化するという欠
点がある。However, there is a drawback that when the pupil changes due to a change in external brightness, the area ratio between the continuous vision area and the near vision area changes significantly.
そこで、遠用部と近用部の面積比が著しく変化する欠点
を解決するものとして、上記公報には第４図に示す二点
点人工水晶体が開示されている。Therefore, in order to solve the drawback that the area ratio of the distance portion and the near portion changes significantly, the above-mentioned publication discloses a two-point artificial crystalline lens shown in FIG. 4.
確かに、これによれば瞳孔の変化に対して遠用部と近用
部との面積比は変らない。しかし、他の問題点を随伴す
る。それは、レンズ製作上、パワーの差をレンズ前面お
るいは後面の曲率を変えて行う場合、第５図に示すよう
に、その境界７で段差を生ずることである。境界の段差
の面での反射は網膜上での像の質を低下させる要因とな
るので好ましくない。Indeed, according to this, the area ratio between the distance vision part and the near vision part does not change even if the pupil changes. However, it comes with other problems. This is because when manufacturing a lens, when the difference in power is achieved by changing the curvature of the front or rear surface of the lens, a step is created at the boundary 7, as shown in FIG. Reflection on the surface of the boundary step is undesirable because it causes a decrease in the quality of the image on the retina.
この点は遠用部と近用部を屈折率の異なる材質でつくる
ことにより、表面の境界に段差をなくすことかできるが
、この場合には内部に境界面ができるため、この面での
屈折が像の質を低下させる要因となりつる。Regarding this point, it is possible to eliminate the level difference at the surface boundary by making the distance and near vision parts with materials with different refractive indexes, but in this case, an internal boundary surface is created, so the refraction on this surface This is a factor that reduces the quality of the image.
本発明の目的は上記欠点に鑑み、瞳孔径の変化に対して
近用部、遠用部の面積比の変化が小さく、かつ、境界上
で段差がない二点点眼球内人工水晶体を提供することに
ある。SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a two-point intraocular artificial lens in which the area ratio of the near and far vision areas changes little with respect to changes in pupil diameter, and there is no step on the boundary. It is in.
［問題点を解決する手段とその作用］
本発明は上記目的を達成するために、近視野用帯域及び
遠視野用帯域がそれぞれほぼ等しい面積比で、しかもレ
ンズの軸に対し非対称的に光学的レンズ部分上に配置さ
れている二点点の眼球内人工水晶体でおることを特徴と
している。[Means for Solving the Problems and Their Effects] In order to achieve the above object, the present invention provides a structure in which the near-field zone and the far-field zone have approximately equal area ratios, and are optically asymmetrical with respect to the axis of the lens. It is characterized by a two-point intraocular artificial crystalline lens placed on the lens part.
瞳孔径の変化による影響を少なくするために、第１図に
示すごとく、近用部を光学的レンズ部内で偏心させる。In order to reduce the influence of changes in pupil diameter, the near vision section is decentered within the optical lens section, as shown in FIG.
このようにすると、瞳孔径が変化したとき、遠用部、近
用部共に面積が変化するから、面積比の変化を小さくす
ることができる。In this way, when the pupil diameter changes, the areas of both the distance and near vision areas change, making it possible to reduce changes in the area ratio.
また、光学的レンズ部内で曲率半径を偏心させた状態で
変えることによりパワー変化を作ると、その境界は段差
を生ずることなく連続した、二点点人工水晶体を製作す
ることができる。In addition, by creating a power change by changing the radius of curvature in an eccentric state within the optical lens part, it is possible to manufacture a two-point artificial crystalline lens whose boundaries are continuous without creating a step.
［発明の実施例］ 以下、本発明の一実施例を第１図により説明する。[Embodiments of the invention] An embodiment of the present invention will be described below with reference to FIG.
第４図は二点点眼球内人工水晶体の概略図である。FIG. 4 is a schematic diagram of a two-point intraocular artificial lens.
１は光学的レンズ部分、２はレンズ周辺部である。３は
穿孔、４は支持柄である。５は遠視野用帯域（遠用部）
、６は近視野用帯域（近用部）を示す。７は遠用部と近
用部の境界を示す。1 is an optical lens portion, and 2 is a peripheral portion of the lens. 3 is a perforation, and 4 is a support handle. 5 is far field zone (far field)
, 6 indicates a near vision zone (near vision area). 7 indicates the boundary between the distance vision area and the near vision area.
ここで近用部は光学的レンズ部分１内で高側方向に偏心
させてあり、近用部と遠用部の面積はほぼ等しく配置し
である。このようにすることにより、瞳孔径が変化して
も、遠用部と近用部の面積比の変化を小さくおさえるこ
とができる。Here, the near vision section is decentered in the high side direction within the optical lens portion 1, and the areas of the near vision section and the distance vision section are approximately equal. By doing this, even if the pupil diameter changes, the change in the area ratio between the distance vision part and the near vision part can be kept small.
次に第２図に上記実施例の人工水晶体の断面を示す。Next, FIG. 2 shows a cross section of the artificial crystalline lens of the above embodiment.
これは表面の曲率を偏心させて変えることにより、遠用
部と近用部を作り出している。Ｒ１は遠用部の曲率半径
で、Ｒ２は近用部の曲率半径である。（Ｒ１＞Ｒ２）そ
して、このとき両者の境界は５に示すごとく段差を生じ
ない。This creates a distance vision area and a near vision area by eccentrically changing the curvature of the surface. R1 is the radius of curvature of the distance vision portion, and R2 is the radius of curvature of the near vision portion. (R1>R2) At this time, the boundary between the two does not have a step as shown in 5.
また表面のみでパワー変化を作るのでなく、前面はＲ１
の曲率とし、後面に偏心させた別の曲率Ｒ３の球面を作
ることによって、近用部を作ってもよい。Also, instead of creating a power change only on the front surface, the front surface is R1
The near vision portion may be created by creating a spherical surface having a curvature of R3 and having another eccentric curvature R3 on the rear surface.
また、別の実施例として、遠用部を耳側方向に偏心させ
た人工水晶体も同様に考えられる。Furthermore, as another example, an artificial crystalline lens in which the distance portion is eccentric in the temporal direction can be similarly considered.
［発明の効果］
本発明によれば、瞳孔径の変化に対して近用部、遠用部
の面積比の変化が小さく、かつ、境界での段差がないの
で、網膜上では近用部、遠用部共に安定した像を形成す
ることができるという効果がある。[Effects of the Invention] According to the present invention, the change in the area ratio of the near vision area and the distance vision area is small with respect to the change in pupil diameter, and there is no step at the boundary, so that on the retina, the near vision area, This has the effect that a stable image can be formed in both the far vision area.
第１図は本発明の一実施例である二点点眼球内人工水晶
体の概略図、第２図は第１図の人工水晶体のＡ−Ａ断面
図、第３図、第４図は従来の二点点眼球内人工水晶体の
概略図、第５図は第４図の二点点眼球内人工水晶体のＢ
−Ｂ断面図である。
１・・・・・・光学的レンズ部分 ２・・・・・・レン
ズ周辺部５・・・・・・遠視野用帯域（遠用部）６・・
・・・・近視野用帯域（近用部）７・・・・・・遠用部
と近用部の境界
特許出願人 株式会社二デック
穿ぶ凹
し 凹Fig. 1 is a schematic diagram of a two-point intraocular artificial lens according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A of the artificial crystalline lens shown in Fig. 1, and Figs. A schematic diagram of the intraocular artificial crystalline lens, Figure 5 is B of the two-point intraocular artificial lens in Fig. 4.
-B sectional view. 1... Optical lens part 2... Lens peripheral part 5... Far field zone (distance part) 6...
...Near vision zone (near vision region) 7...Boundary between distance vision region and near vision region Patent applicant Nidec Co., Ltd. Recessed hole
Claims (1)
面積比で、しかもレンズの軸に対し非対称的に光学的レ
ンズ部分上に配置されていることを特徴とする二焦点の
眼球内人工水晶体。A bifocal intraocular artificial lens, characterized in that a near-field zone and a far-field zone are arranged on an optical lens part in a substantially equal area ratio and asymmetrically with respect to the axis of the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12239588A JPH01291857A (en) | 1988-05-19 | 1988-05-19 | In-eyeball two-focal point artificial crystalline lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12239588A JPH01291857A (en) | 1988-05-19 | 1988-05-19 | In-eyeball two-focal point artificial crystalline lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01291857A true JPH01291857A (en) | 1989-11-24 |
Family
ID=14834732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12239588A Pending JPH01291857A (en) | 1988-05-19 | 1988-05-19 | In-eyeball two-focal point artificial crystalline lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01291857A (en) |
-
1988
- 1988-05-19 JP JP12239588A patent/JPH01291857A/en active Pending
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