GB259501A - Improvements in and relating to ophthalmic lenses - Google Patents
Improvements in and relating to ophthalmic lensesInfo
- Publication number
- GB259501A GB259501A GB1359426A GB1359426A GB259501A GB 259501 A GB259501 A GB 259501A GB 1359426 A GB1359426 A GB 1359426A GB 1359426 A GB1359426 A GB 1359426A GB 259501 A GB259501 A GB 259501A
- Authority
- GB
- United Kingdom
- Prior art keywords
- astigmatism
- insert
- relating
- block
- spherical segment
- 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
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/025—Re-forming glass sheets by bending by gravity
- C03B23/0252—Re-forming glass sheets by bending by gravity by gravity only, e.g. sagging
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/20—Uniting glass pieces by fusing without substantial reshaping
- C03B23/22—Uniting glass lenses, e.g. forming bifocal lenses
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- 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
259,501. Redfern, C. G., (American Optical Co.). May 28, 1926. Spectacle lenses.-In order to remove the astigmatism of the reading portion of a fused bifocal lens due to the spherical segment, the entire blank is heated upon a block 12 of toric form, so that the lens settles on to the block 12, giving the surfaces and also the insert 11 a toric form. The radii of the curvature of the two meridians are chosen so that they will correct the astigmatism of the spherical segment. The insert 11 after heating and bending assumes an elliptical form. A numerical example is given in the Specification.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1359426A GB259501A (en) | 1926-05-28 | 1926-05-28 | Improvements in and relating to ophthalmic lenses |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1359426A GB259501A (en) | 1926-05-28 | 1926-05-28 | Improvements in and relating to ophthalmic lenses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB259501A true GB259501A (en) | 1926-10-14 |
Family
ID=10025817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1359426A Expired GB259501A (en) | 1926-05-28 | 1926-05-28 | Improvements in and relating to ophthalmic lenses |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB259501A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2419257A1 (en) * | 1978-03-08 | 1979-10-05 | Stenger Et Cie Sarl E Et G | Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading |
WO2017123092A1 (en) * | 2016-01-15 | 2017-07-20 | Frambach B.V. | Method of manufacturing a pair of spectacle lenses for the improvement of the visual performance in patients with keratoconus, as well as a set of spectacle lenses |
-
1926
- 1926-05-28 GB GB1359426A patent/GB259501A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2419257A1 (en) * | 1978-03-08 | 1979-10-05 | Stenger Et Cie Sarl E Et G | Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading |
WO2017123092A1 (en) * | 2016-01-15 | 2017-07-20 | Frambach B.V. | Method of manufacturing a pair of spectacle lenses for the improvement of the visual performance in patients with keratoconus, as well as a set of spectacle lenses |
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