GB831546A - Improvements in or relating to lenses - Google Patents
Improvements in or relating to lensesInfo
- Publication number
- GB831546A GB831546A GB1162657A GB1162657A GB831546A GB 831546 A GB831546 A GB 831546A GB 1162657 A GB1162657 A GB 1162657A GB 1162657 A GB1162657 A GB 1162657A GB 831546 A GB831546 A GB 831546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- area
- zone
- vision
- lens
- pupil
- 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.)
- Expired
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
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Prostheses (AREA)
- Eyeglasses (AREA)
Abstract
831,546. A bifocal contact lens. DE CARLE, J. T. April 9, 1958 [April 9, 1957], No. 11626/57. Class 97(1) The contact lens has one zone 1 adapted to correct for "distance" vision and another zone 2 adapted for "reading" vision, the latter occupying the outer part of the lens. The area of the central zone occupies approximately half the average area of the pupil 7 and the area of the whole lens is slightly larger than the largest area of the pupil. A third zone may be introduced between the other two to correct for vision at about one metre from the eye.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1162657A GB831546A (en) | 1957-04-09 | 1957-04-09 | Improvements in or relating to lenses |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1162657A GB831546A (en) | 1957-04-09 | 1957-04-09 | Improvements in or relating to lenses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB831546A true GB831546A (en) | 1960-03-30 |
Family
ID=9989730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1162657A Expired GB831546A (en) | 1957-04-09 | 1957-04-09 | Improvements in or relating to lenses |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB831546A (en) |
-
1957
- 1957-04-09 GB GB1162657A patent/GB831546A/en not_active Expired
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