JPS5484754A - Spectacle lens - Google Patents
Spectacle lensInfo
- Publication number
- JPS5484754A JPS5484754A JP15082677A JP15082677A JPS5484754A JP S5484754 A JPS5484754 A JP S5484754A JP 15082677 A JP15082677 A JP 15082677A JP 15082677 A JP15082677 A JP 15082677A JP S5484754 A JPS5484754 A JP S5484754A
- Authority
- JP
- Japan
- Prior art keywords
- correcting position
- sightedness
- plane
- intersecting line
- principal meridian
- 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 improve the imaging performance, by providing a part, which is not an umbilical point, in part of the plane running long the principal meridian in the near-sightedness correcting position, and providing a curve of which vertical direction component of the prism is constant in the medium vision correcting position.
CONSTITUTION: The long-sightedness correcting position F of variable focal spectacle lens is a part of aspherical face symmetrical with respect to the axis of rotation of which curvature increases in the peripheral part. The near-sightedness correcting position N is a part of aspherical face symmetrical with respect to the axis of rotation of which curvature decreases in the peripheral part, and has a part which is not an umbilical point provided in at least one part in the plane running along the principal meridian M-M'. In the medium vision correcting position P, the intersecting line group Cn-Cn' formed by the plane Ln orthogonal to the principal meridian M-M' and the refracted plane also contains a shape which is not circular, and it is so constituted that the vertical component of the prism is constant along a certain intersecting line in the intersecting line group.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15082677A JPS5484754A (en) | 1977-12-14 | 1977-12-14 | Spectacle lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15082677A JPS5484754A (en) | 1977-12-14 | 1977-12-14 | Spectacle lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5484754A true JPS5484754A (en) | 1979-07-05 |
Family
ID=15505239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15082677A Pending JPS5484754A (en) | 1977-12-14 | 1977-12-14 | Spectacle lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5484754A (en) |
-
1977
- 1977-12-14 JP JP15082677A patent/JPS5484754A/en active Pending
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