JPH0389415U - - Google Patents
Info
- Publication number
- JPH0389415U JPH0389415U JP15120089U JP15120089U JPH0389415U JP H0389415 U JPH0389415 U JP H0389415U JP 15120089 U JP15120089 U JP 15120089U JP 15120089 U JP15120089 U JP 15120089U JP H0389415 U JPH0389415 U JP H0389415U
- Authority
- JP
- Japan
- Prior art keywords
- vision region
- area
- pupil
- amount
- near vision
- 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.)
- Granted
Links
- 208000001491 myopia Diseases 0.000 claims description 10
- 201000010041 presbyopia Diseases 0.000 claims description 5
- 210000001747 pupil Anatomy 0.000 claims 6
- 230000003287 optical effect Effects 0.000 claims 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Eyeglasses (AREA)
Description
第１図は、本考案の第１の実施例における老眼
用コンタクトレンズの直径方向に沿つた断面図、
第２図は、本考案の第２の実施例における老眼用
コンタクトレンズの直径方向に沿つた断面図、第
３図は本考案による老眼用コンタクトレンズの構
成を眼内レンズに応用した場合の変形例を示す平
面図、第４図は、第３図に示した眼内レンズの直
径方向に沿つた断面図、第５図は、従来の２焦点
コンタクトレンズの１例を示す断面図、第６図は
、従来の２焦点コンタクトレンズの別の例を示す
断面図、第７図は、従来の２焦点コンタクトレン
ズのさらに別の例を示す断面図である。
１……コンタクトレンズ、２……中央遠方視領
域、３，５，７，９……近方視領域、４，６，８
……遠方視領域。
FIG. 1 is a cross-sectional view along the diameter direction of a contact lens for presbyopia according to a first embodiment of the present invention;
Fig. 2 is a cross-sectional view along the diameter direction of a contact lens for presbyopia according to the second embodiment of the present invention, and Fig. 3 is a modification when the structure of the contact lens for presbyopia according to the present invention is applied to an intraocular lens. FIG. 4 is a plan view showing an example, and FIG. 4 is a cross-sectional view along the diameter direction of the intraocular lens shown in FIG. 3. FIG. 5 is a cross-sectional view showing an example of a conventional bifocal contact lens. This figure is a sectional view showing another example of a conventional bifocal contact lens, and FIG. 7 is a sectional view showing still another example of a conventional bifocal contact lens. 1... Contact lens, 2... Central far vision area, 3, 5, 7, 9... Near vision area, 4, 6, 8
...Distance viewing area.
Claims (1)
と、中央に円形の光学的に滑らかな遠方視領域、
およびその外側にフレネル面がそれぞれ形成され
た凸面からなる前面とを有するものであつて、前
記フレネル面が遠方視領域および近方視領域を備
えかつ少なくとも２種類の焦点を有すると共に、
前記前面における全光学領域に占める前記遠方視
領域と前記近方視領域の面積の比率が６５：３５
以上と前記遠方視領域の面積の方が大きいか、ま
たは前記近方視領域と前記遠方視領域の面積の比
率が６５：３５以上と前記近方視領域の面積の方
が大きくなるように、前記中央遠方視領域の直径
、および前記フレネル面に占める前記遠方視領域
と前記近方視領域の面積の比率を設定したもので
あることを特徴とする老眼用コンタクトレンズ。 (2) 遠方視するとき、前記遠方視領域を通じて
瞳孔に供給される光量と前記近方視領域を通じて
前記瞳孔に供給される光量の比率が６１：３９以
上と前記遠方視領域を通じて前記瞳孔に供給され
る光量の方が多くなり、近方視するとき、前記近
方視領域を通じて前記瞳孔に供給される光量と前
記遠方視領域を通じて前記瞳孔に供給される光量
の比率が６１：３９以上と前記近方視領域を通じ
て瞳孔に供給される光量の方が多くなるようにし
たものであることを特徴とする第１請求項に記載
の老眼用コンタクトレンズ。[Claims for Utility Model Registration] (1) A rear surface consisting of a concave surface that conforms to the corneal surface of the eye, and a circular optically smooth distance viewing area in the center;
and a front surface consisting of a convex surface having a Fresnel surface formed on the outside thereof, the Fresnel surface having a far vision region and a near vision region and having at least two types of focal points,
The ratio of the areas of the far vision area and the near vision area to the total optical area on the front surface is 65:35.
The area of the far vision region is larger than the above, or the area of the near vision region is larger than the ratio of the area of the near vision region and the far vision region of 65:35 or more. A contact lens for presbyopia, characterized in that the diameter of the central far vision region and the ratio of the areas of the far vision region and the near vision region occupying the Fresnel surface are set. (2) When viewing at a distance, the ratio of the amount of light supplied to the pupil through the distance vision region and the amount of light supplied to the pupil through the near vision region is 61:39 or more, and the amount of light supplied to the pupil through the distance vision region is 61:39 or more. The ratio of the amount of light supplied to the pupil through the near vision region and the amount of light supplied to the pupil through the distance vision region is 61:39 or more when viewing near vision. The contact lens for presbyopia according to claim 1, characterized in that the amount of light supplied to the pupil through the near vision region is greater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989151200U JP2542131Y2 (en) | 1989-12-26 | 1989-12-26 | Contact lenses for presbyopia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989151200U JP2542131Y2 (en) | 1989-12-26 | 1989-12-26 | Contact lenses for presbyopia |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0389415U true JPH0389415U (en) | 1991-09-12 |
| JP2542131Y2 JP2542131Y2 (en) | 1997-07-23 |
Family
ID=31697508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989151200U Expired - Lifetime JP2542131Y2 (en) | 1989-12-26 | 1989-12-26 | Contact lenses for presbyopia |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2542131Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59146020A (en) * | 1982-10-13 | 1984-08-21 | エヌ・ジ−・トラステイ−ズ・アンド・ノミニ−ズ・リミテイド | Double focus contact lens |
-
1989
- 1989-12-26 JP JP1989151200U patent/JP2542131Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59146020A (en) * | 1982-10-13 | 1984-08-21 | エヌ・ジ−・トラステイ−ズ・アンド・ノミニ−ズ・リミテイド | Double focus contact lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2542131Y2 (en) | 1997-07-23 |
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