JPS5776520A - Spectacle lens - Google Patents
Spectacle lensInfo
- Publication number
- JPS5776520A JPS5776520A JP15253680A JP15253680A JPS5776520A JP S5776520 A JPS5776520 A JP S5776520A JP 15253680 A JP15253680 A JP 15253680A JP 15253680 A JP15253680 A JP 15253680A JP S5776520 A JPS5776520 A JP S5776520A
- Authority
- JP
- Japan
- Prior art keywords
- section
- correction part
- shortsight
- farsight
- eyeball
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Abstract
PURPOSE:To decrease the turning angle of an eyeball and to reduce the fatigue of the eyeball, by concentrating the distortion or aberration at the side part of an intermediate sight correction part or the side part and its vicinity of the said correction part. CONSTITUTION:The farsight correction part and the shortsight correction part exist in the upper section D and the lower section N of a lens respectively, and the prograsive degree section P of the intermediate sight correction part exists between the sections D and N. The distortion or abberation is concentrated at an area of oblique lines where the full section P overlaps a part of the section N. The change is shown in the diagram for the refractive power along a main meridian line M-M', and the length of the line M-M' of the section P is reduced down to 0.5-5mm. in order to reduce the turning angle of an eyeball when the wearer of spectacles shifts his or her eyes from shortsight to farsight and vice versa. As a result, the distortion or deflection of an image can be substantially eliminated at the correction part of both the farsight and the shortsight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15253680A JPS5776520A (en) | 1980-10-30 | 1980-10-30 | Spectacle lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15253680A JPS5776520A (en) | 1980-10-30 | 1980-10-30 | Spectacle lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5776520A true JPS5776520A (en) | 1982-05-13 |
Family
ID=15542581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15253680A Pending JPS5776520A (en) | 1980-10-30 | 1980-10-30 | Spectacle lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5776520A (en) |
-
1980
- 1980-10-30 JP JP15253680A patent/JPS5776520A/en active Pending
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