JPS54118851A - Spectacle lens - Google Patents
Spectacle lensInfo
- Publication number
- JPS54118851A JPS54118851A JP2567278A JP2567278A JPS54118851A JP S54118851 A JPS54118851 A JP S54118851A JP 2567278 A JP2567278 A JP 2567278A JP 2567278 A JP2567278 A JP 2567278A JP S54118851 A JPS54118851 A JP S54118851A
- Authority
- JP
- Japan
- Prior art keywords
- sight correcting
- main meridian
- near vision
- far vision
- 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.)
- Pending
Links
Landscapes
- Eyeglasses (AREA)
Abstract
PURPOSE: To obtain a comfortable field of view continuously from far vision to near vision by forming a far vision part, an intermediate part where curvature progressively changes and a near vision part along the main meridian provided in the nearly central longitudinal direction.
CONSTITUTION: The main meridian MM' provided in the nearly central longitudinal direction is made umbilical over the entire line and is segmented to a far vision sight correcting portion F, an intermediate sight correcting portion P where curvature changes progressively and a near vision sight correcting protion N, these being respectively continuously connected at the boundaries. Then, the circular intersecting line that the face crossing at a right angle to the main meridian MM' and the refractive face assume comes to the intermediate port of the intermediate sight correcting portion P, thus enabling the field of view of good total balance from the far vision sight correcting portion F to the intermediate and near vision sight correcting parts P, N. In addition, the curvatures of the intersecting line group perpendicular to the main meridian MM' in the intermediate and near vision sight correcting portions P, N become smaller as they go away from the main meridian MM' and said curvatures become larger as they go away from the main meridian MM' in the upper part of the intermediate sight correcting protion P and the far vision sight correcting part F, thus the astigmatisms and distortion aberrations in the entire part of the lens are reduced.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2567278A JPS54118851A (en) | 1978-03-07 | 1978-03-07 | Spectacle lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2567278A JPS54118851A (en) | 1978-03-07 | 1978-03-07 | Spectacle lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54118851A true JPS54118851A (en) | 1979-09-14 |
Family
ID=12172266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2567278A Pending JPS54118851A (en) | 1978-03-07 | 1978-03-07 | Spectacle lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54118851A (en) |
-
1978
- 1978-03-07 JP JP2567278A patent/JPS54118851A/en active Pending
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