JP3853849B2 - Eyeglass lenses - Google Patents
Eyeglass lenses Download PDFInfo
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- JP3853849B2 JP3853849B2 JP30943993A JP30943993A JP3853849B2 JP 3853849 B2 JP3853849 B2 JP 3853849B2 JP 30943993 A JP30943993 A JP 30943993A JP 30943993 A JP30943993 A JP 30943993A JP 3853849 B2 JP3853849 B2 JP 3853849B2
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- Japan
- Prior art keywords
- lens
- point
- power
- refractive power
- spectacle lens
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- 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.)
- Expired - Lifetime
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Description
【０００１】
【産業上の利用分野】
本発明は老視矯正用眼鏡レンズに係わり、特に中間距離から近距離を明視するための累進多焦点レンズに関する。
【０００２】
【従来の技術】
老視の矯正には単焦点レンズやバイフォーカルレンズ、累進多焦点レンズ等が用いられている。これらの中でも特に累進多焦点レンズは、遠方視時と近方視時で眼鏡の掛け変えや掛けはずしがいらずまた、見た目にもバイフォーカルレンズのような境目がなく、その需要はかなり高まってきた。
【０００３】
しかし累進多焦点レンズには、視野のゆれ・歪み等の問題があり、さらにはその構造上どうしても遠中近それぞれの視野が狭く、特に手元から中間距離までの視野が必要となる作業では明視できる領域が非常に狭いため、室内等での使用にはあまり向いていなかった。
【０００４】
この様な背景の中で、特開昭６２−１０６１７に開示された、中間距離から近方視時を重視した設計の中近両用累進多焦点レンズが注目されてきた。中近両用累進多焦点レンズは一般の遠近両用累進多焦点レンズと比較したとき、ゆれや歪みが少なく、手元から中間距離までの視野も広く、特に室内では使いやすい眼鏡レンズといわれている。
【０００５】
【発明が解決しようとする課題】
しかしながら、特開昭６２−１０６１７の累進多焦点レンズは、眼鏡装着者の加入度数により、フィッティングポイント（アイポイント）近傍で明視できる距離が変わってしまうという問題点がある。
【０００６】
例えば図１のごとく累進多焦点レンズの座標系を定義し、フィッティングポイントをＯで表し、眼鏡装着者の遠用処方がＳ０．００ディオプトリー（正視）だったとする。この時、特開昭６２−１０６１７の累進多焦点レンズの主子午線上の屈折力の変化は、加入度数が１．０ディオプトリーの時、図２のＡで示され、加入度数２．０ディオプトリーの時同図Ｂ、加入度数３．０ディオプトリーの時Ｃで表される。フィッティングポイントでの屈折力は、同図Ｙ＝Ｏの時であり、装着者の加入度数がＡならば０．４ディオプトリー、Ｂならば０．８ディオプトリー、Ｃならば１．２ディオプトリー、それぞれ遠用屈折力に対し付加されている。従って、加入度数Ａの人はフィッティングポイント近傍で２．５ｍ、Ｂの人は１．２５ｍ、Ｃの人に至っては０．８３ｍまでしか明視できないことになる。人間が中間距離を注視するときの視線は一般的に水平からやや下方になるため、特に室内用累進多焦点レンズ又は、中近両用累進多焦点レンズでは、眼鏡使用者がどの様な加入度数であっても、フィッティングポイント近傍で、約２ｍ位先が明視できることが好ましい。特開昭６２−１０６１７の累進多焦点レンズでは、眼鏡使用者の加入度数が強くなると、フィッティングポイント近傍で数十センチメートル先しか明視できない。
【０００７】
本発明の目的はこれらの問題を解決できる、中近距離を重視した設計の、眼鏡レンズを提供するものである。
【０００８】
【課題を解決するための手段】
本発明の眼鏡レンズは、レンズを構成する２つの屈折面のうち少なくとも１つの屈折面が、前記レンズのほぼ中央を通る主子午線に沿って累進帯を持ち、前記主子午線上の遠用中心と近用中心の間で所定の加入度数が付加される眼鏡レンズにおいて、前記累進帯の開始点と終了点の間にフィッティングポイントを有し、かつ前記累進帯の開始点から前記フィッティングポイント近傍までの加入度数の平均勾配と、前記フィッティングポイント近傍から前記累進帯の終了点までの加入度数の平均勾配が異なり、かつ前記フィッティングポイントにおける前記眼鏡レンズの屈折力をＦＰディオプトリー、前記眼鏡レンズの遠用屈折力をＤＰディオプトリーとしたとき、
ＦＰ−ＤＰ＝０．５ （単位：ディオプトリー）
なる関係が成り立つことを特徴とする。
【０００９】
本発明の眼鏡レンズは加入度数によらず、フィッティングポイントにおいて遠用屈折力ＤＰに所定の屈折力を付加してある。付加すべき所定の屈折力であるが、前記眼鏡レンズの遠用屈折力に対し、０．５ディオプトリーが好ましい。これはフィッティングポイント近傍で約２ｍ先が明視できると、普段の生活で違和感無く使用できるためである。但し使用環境によっては、フィッティングポイント近傍で明視できる距離が、前述値に対し±１ｍまでは同等の効果があるため、上記の関係式となる。
【００１０】
【実施例】
本発明の実施例を図面に基づいて説明する
図３は本発明の眼鏡レンズの座標系を表すものであり、主子午線をＹ軸に置き、フィッティングポイントをＯ、累進帯開始点の座標をＰ、累進帯終了点の座標をＱ、眼鏡レンズ最上端部の座標をＲ、最下端部の座標をＳで示してある。図４は本発明の眼鏡レンズの主子午線上の屈折力の変化の数例を表しており、ＤＰを本発明の眼鏡レンズの遠用屈折力としたとき、もし使用者の加入度数が１．０ディオプトリーならば図中Ａの線で表され、加入度数が２．０、３．０ディオプトリーならばそれぞれＢ、Ｃの線で表される。またＦＰは本発明の眼鏡レンズのフィッティングポイントＯにおける屈折力を示している。図４において、本発明の眼鏡レンズ使用者は、ＲからＰの領域を通して遠方視を行い、ＱからＳの領域を通して近方視、そしてＰからＱの間の累進帯で中間距離を見るわけである。
【００１１】
そしてフィッティングポイントＯにおいて、眼鏡レンズの遠用屈折力に対し付加されている屈折力を、加入度数によらず一定にすると、図４でＰからＯの勾配も、ＦＰの位置も加入度数によらず一定となり、ＯからＱの区間で、加入度数により使用者の近用処方まで累進的に屈折力が変化する。従って累進帯ＰからＱの間で、ＰＯ間の屈折力勾配と、ＯＱ間の屈折力勾配は原則として変わってくるのが特徴となる。
【００１２】
また屈折力の勾配は図４の様に直線でなくとも、図５に示すごとく曲線状になっていても同等の効果が期待できる。
【００１３】
図６に、一例として遠用屈折力Ｓ０．００ディオプトリー、加入度数３．０ディオプトリーの、本発明の眼鏡レンズの主子午線上の屈折力の変化及び、累進帯の長さ等、具体的な値として示した。累進帯はフィッティングポイントＯの１０ｍｍ上から始まり、フィッティングポイントＯの１５ｍｍ下まで、２５ｍｍとってある。これは屈折力勾配をできる限り緩やかにとることにより、ゆれや歪みを抑え、かつ遠用部領域、近用部領域を確保するためである。フィッティングポイントＯでは、遠用屈折力に対し０．５ディオプトリーの付加なので、使用者は２ｍ先が明視でき、それより遠くは視線をやや上にすることにより、近くは下にすることにより見ることができるので室内での生活環境に非常に適している。
【００１４】
【発明の効果】
以上の如く、本発明の眼鏡レンズによれば、眼鏡使用者の遠用処方や加入度数によらず、フィッティングポイント近傍において約２ｍ先を明視でき、中間距離から手元まで非常に広い視野を得ることができる。
【図面の簡単な説明】
【図１】累進多焦点レンズの座標系を示した平面図。
【図２】特開昭６２−１０６１７の主子午線上の屈折力変化図。
【図３】本発明の眼鏡レンズの座標系を示した平面図。
【図４】本発明の眼鏡レンズの主子午線上の屈折力変化図。
【図５】本発明の眼鏡レンズの主子午線上の屈折力変化図。
【図６】本発明の眼鏡レンズの主子午線上の屈折力変化図。
【符号の説明】
Ｏ ・・・・・フィッティングポイント（アイポイント）
Ｐ ・・・・・累進帯開始点
Ｑ ・・・・・累進帯終了点
Ｒ ・・・・・眼鏡レンズ最上端部
Ｓ ・・・・・眼鏡レンズ最下端部
ＤＰ・・・・・遠用屈折力
ＦＰ・・・・・フィッティングポイントにおける屈折力
Ａ ・・・・・加入度数１．０ディオプトリーの時の主子午線上の屈折力変化
Ｂ ・・・・・加入度数２．０ディオプトリーの時の主子午線上の屈折力変化
Ｃ ・・・・・加入度数３．０ディオプトリーの時の主子午線上の屈折力変化[0001]
[Industrial application fields]
The present invention relates to a spectacle lens for correcting presbyopia, and more particularly to a progressive multifocal lens for clearly viewing a short distance from an intermediate distance.
[0002]
[Prior art]
Single vision lenses, bifocal lenses, progressive multifocal lenses, etc. are used to correct presbyopia. Of these, progressive multifocal lenses, in particular, have no need to change or remove eyeglasses during distance and near vision, and there is no boundary like a bifocal lens. It was.
[0003]
Progressive multifocal lenses, however, have problems such as field shake and distortion, and the structure of the progressive multifocal lens inevitably has a narrow field of view in the far, middle, and near fields, especially in work that requires a field of view from the hand to the middle distance. Since the area that can be produced is very small, it is not suitable for indoor use.
[0004]
In such a background, a progressive multifocal lens for both near and middle, which is disclosed in Japanese Patent Application Laid-Open No. Sho 62-10617, which focuses on near vision from an intermediate distance, has attracted attention. Compared with a general far-distance progressive multifocal lens, the mid- and near-distance progressive multifocal lens is said to be a spectacle lens that is less likely to be shaken and distorted and has a wide field of view from the hand to the intermediate distance, and is particularly easy to use indoors.
[0005]
[Problems to be solved by the invention]
However, the progressive multifocal lens disclosed in Japanese Patent Laid-Open No. 62-10617 has a problem that the distance that can be clearly seen in the vicinity of the fitting point (eye point) varies depending on the addition power of the spectacle wearer.
[0006]
For example, assume that the coordinate system of a progressive multifocal lens is defined as shown in FIG. 1, the fitting point is represented by O, and the distance prescription of the spectacle wearer is S0.00 dioptre (normal vision). At this time, the change in refractive power on the main meridian of the progressive multifocal lens disclosed in Japanese Patent Application Laid-Open No. Sho 62-10617 is indicated by A in FIG. 2 when the add power is 1.0 diopter. Time B is represented by C when the addition power is 3.0 diopters. The refractive power at the fitting point is when Y = O in the figure. If the wearer's addition power is A, the dioptric power is 0.4 diopters, B is 0.8 diopters, and C is 1.2 diopters. It is added to the refractive power. Therefore, the person with the addition power A can only clearly see up to 2.5 m near the fitting point, the person with B to 1.25 m, and the person with C to 0.83 m. Since the line of sight when a human gazes at an intermediate distance is generally slightly downward from the horizontal, in particular for indoor progressive multifocal lenses or near-both progressive multifocal lenses, what degree of addition is required by the eyeglass user? Even in this case, it is preferable that about 2 m ahead can be clearly seen in the vicinity of the fitting point. In the progressive multifocal lens disclosed in Japanese Patent Application Laid-Open No. Sho 62-10617, when the addition power of the spectacle user is increased, only a few tens of centimeters can be clearly seen in the vicinity of the fitting point.
[0007]
An object of the present invention is to provide a spectacle lens that can solve these problems and is designed with an emphasis on middle and short distances.
[0008]
[Means for Solving the Problems]
In the spectacle lens of the present invention, at least one of the two refracting surfaces constituting the lens has a progressive zone along the main meridian passing through the center of the lens, and the distance center on the main meridian In the spectacle lens to which a predetermined addition power is added between the near centers, the eyeglass lens has a fitting point between the start point and the end point of the progressive zone, and from the start point of the progressive zone to the vicinity of the fitting point The average gradient of the addition power is different from the average gradient of the addition power from the vicinity of the fitting point to the end point of the progressive zone, and the refractive power of the spectacle lens at the fitting point is FP diopter, and the distance refraction of the spectacle lens When the force is DP diopter,
FP-DP = 0.5 (Unit: Diopter)
It is characterized by the following relationship.
[0009]
In the spectacle lens of the present invention, a predetermined refractive power is added to the distance refractive power DP at the fitting point regardless of the addition power. The predetermined refractive power to be added is preferably 0.5 diopters with respect to the distance refractive power of the spectacle lens. This is because it is possible to use it in everyday life without a sense of incongruity if a distance of about 2 m can be clearly seen near the fitting point. However, depending on the operating environment, the distance that can be clearly seen in the vicinity of the fitting point has the same effect up to ± 1 m with respect to the above value, so the above relational expression is obtained.
[0010]
【Example】
An embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows the coordinate system of the spectacle lens of the present invention. The main meridian is placed on the Y axis, the fitting point is O, and the coordinate of the progressive zone start point is P. The coordinates of the progressive zone end point are indicated by Q, the coordinates of the uppermost end of the spectacle lens are indicated by R, and the coordinates of the lowermost end are indicated by S. FIG. 4 shows several examples of the change in refractive power on the main meridian of the spectacle lens of the present invention. When DP is the refractive power for the distance of the spectacle lens of the present invention, the addition power of the user is 1. If it is 0 diopter, it is represented by the line A in the figure, and if the addition power is 2.0 and 3.0 diopters, it is represented by the lines B and C, respectively. FP indicates the refractive power at the fitting point O of the spectacle lens of the present invention. In FIG. 4, the spectacle lens user of the present invention performs far vision through the R to P region, near vision through the Q to S region, and sees the intermediate distance in the progressive zone between P and Q. is there.
[0011]
When the refractive power added to the distance power of the spectacle lens at the fitting point O is made constant regardless of the addition power, the gradient from P to O and the position of FP in FIG. 4 depend on the addition power. In the interval from O to Q, the refractive power gradually changes from the addition power to the user's near-prescription. Therefore, in principle, the refractive power gradient between POs and the refractive power gradient between OQs vary between progressive zones P and Q.
[0012]
Further, even if the gradient of refractive power is not a straight line as shown in FIG. 4 or a curved shape as shown in FIG. 5, the same effect can be expected.
[0013]
FIG. 6 shows specific values such as the change in refractive power on the main meridian of the spectacle lens of the present invention and the length of the progressive zone, as an example, with a distance power of S0.00 diopter and an addition power of 3.0 diopters. As shown. The progressive zone starts from 10 mm above the fitting point O and is 25 mm up to 15 mm below the fitting point O. This is because by taking the refractive power gradient as gently as possible, it is possible to suppress shaking and distortion, and to secure the distance portion region and the near portion region. At the fitting point O, since 0.5 diopters are added to the distance power, the user can see clearly 2m ahead, and look farther away by making the line of sight slightly higher and closer to the lower side. It is very suitable for indoor living environment.
[0014]
【The invention's effect】
As described above, according to the spectacle lens of the present invention, it is possible to clearly see about 2 m ahead in the vicinity of the fitting point regardless of the distance prescription and addition power of the spectacle user, and to obtain a very wide field of view from the intermediate distance to the hand. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view showing a coordinate system of a progressive multifocal lens.
FIG. 2 is a graph showing changes in refractive power on the main meridian of JP-A-62-1617.
FIG. 3 is a plan view showing a coordinate system of the spectacle lens of the present invention.
FIG. 4 is a refractive power change diagram on the main meridian of the spectacle lens of the present invention.
FIG. 5 is a refractive power change diagram on the main meridian of the spectacle lens of the present invention.
FIG. 6 is a refractive power change diagram on the main meridian of the spectacle lens of the present invention.
[Explanation of symbols]
O ...... Fitting point (eye point)
P ... Progressive belt start point Q ... Progressive belt end point R ... Eyeglass lens uppermost end S ... Eyeglass lens lowermost end DP ... Distant Refracting power FP …… refracting power A at the fitting point ・ ・ ・ ・ ・ refractive power change B on the main meridian when the addition is 1.0 diopter ・ ・ ・ ・ ・ when the addition is 2.0 dioptre Refractive power change on the main meridian C ・ ・ ・ Refractive power change on the main meridian when the addition power is 3.0 diopters
Claims (1)
ＦＰ−ＤＰ＝０．５ （単位：ディオプトリー）
なる関係が成り立つことを特徴とする眼鏡レンズ。At least one of the two refracting surfaces constituting the lens has a region (hereinafter referred to as a progressive zone) in which the radius of curvature changes progressively along a main meridian passing through substantially the center of the lens, In a spectacle lens to which a predetermined addition power is added between a distance center and a near center on the main meridian, a fitting point is provided between the start point and the end point of the progressive zone, and the start of the progressive zone The average gradient of the addition power from the point to the vicinity of the fitting point is different from the average gradient of the addition power from the vicinity of the fitting point to the end point of the progressive zone, and the refractive power of the spectacle lens at the fitting point is FP diopter. When the refractive power of the eyeglass lens is DP diopter,
FP-DP = 0.5 (Unit: Diopter)
A spectacle lens characterized by the following relationship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30943993A JP3853849B2 (en) | 1993-12-09 | 1993-12-09 | Eyeglass lenses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30943993A JP3853849B2 (en) | 1993-12-09 | 1993-12-09 | Eyeglass lenses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07159737A JPH07159737A (en) | 1995-06-23 |
| JP3853849B2 true JP3853849B2 (en) | 2006-12-06 |
Family
ID=17993015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30943993A Expired - Lifetime JP3853849B2 (en) | 1993-12-09 | 1993-12-09 | Eyeglass lenses |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3853849B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121790A (en) * | 2017-06-16 | 2017-09-01 | 沈华豹 | Progressive multi-focal point type eyeglass |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008065358A (en) * | 2007-11-28 | 2008-03-21 | Tokai Kogaku Kk | Progressive refractive power lens |
| CN107615280B (en) | 2015-05-26 | 2021-12-24 | 豪雅镜片泰国有限公司 | Method and apparatus for designing progressive-power lens |
| US10401649B2 (en) | 2015-05-26 | 2019-09-03 | Hoya Lens Thailand Ltd. | Method of designing progressive refractive power lens, and lens set |
| IL249288A0 (en) * | 2016-11-29 | 2017-03-30 | Shamir Optical Ind Ltd | Ophthalmic lens |
-
1993
- 1993-12-09 JP JP30943993A patent/JP3853849B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121790A (en) * | 2017-06-16 | 2017-09-01 | 沈华豹 | Progressive multi-focal point type eyeglass |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07159737A (en) | 1995-06-23 |
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