JPS54145155A - Spectacle lens - Google Patents
Spectacle lensInfo
- Publication number
- JPS54145155A JPS54145155A JP5294778A JP5294778A JPS54145155A JP S54145155 A JPS54145155 A JP S54145155A JP 5294778 A JP5294778 A JP 5294778A JP 5294778 A JP5294778 A JP 5294778A JP S54145155 A JPS54145155 A JP S54145155A
- Authority
- JP
- Japan
- Prior art keywords
- region
- lens
- goes
- curvature becomes
- becomes smaller
- 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
Landscapes
- Eyeglasses (AREA)
Abstract
PURPOSE: To obtain a spectacle lens which gives a comfortable field of view continuously from far to near vision by so forming the lens that the curvature becomes smaller in the lower region and larger in the upper region the further it goes from the main meridian.
CONSTITUTION: The lens is divided to a far vision part F, progressive focus part P and near vision part N along its main meridian MM'. At the point A, the circular intersecting line composed of the face crossing the MM' at a right angle and a refracting face exists. In the lower part of the P region and in the N region, the curvature becomes smaller the further it goes from the MM' and in the upper part of the P region and in the F region, the curvature becomes larger the further it goes from the MM' and therefore the lens of the performance of small astigmatism and distortion aberration and good total balance over the entire part of the lens may be obtained. In addition, the perpendicular components of prism are constant near the circular intersecting line perpendicularly intersecting with the main meridan MM' at the A point on the refracting face and therefore, the image with which fluctuation is difficult to sense may be obtained as against the lateral change of the eye ball.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5294778A JPS54145155A (en) | 1978-05-02 | 1978-05-02 | Spectacle lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5294778A JPS54145155A (en) | 1978-05-02 | 1978-05-02 | Spectacle lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54145155A true JPS54145155A (en) | 1979-11-13 |
Family
ID=12929058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5294778A Pending JPS54145155A (en) | 1978-05-02 | 1978-05-02 | Spectacle lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54145155A (en) |
-
1978
- 1978-05-02 JP JP5294778A patent/JPS54145155A/en active Pending
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