GB259501A - Improvements in and relating to ophthalmic lenses - Google Patents

Improvements in and relating to ophthalmic lenses

Info

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
Application number
GB1359426A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Optical Corp
Original Assignee
American Optical Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by American Optical Corp filed Critical American Optical Corp
Priority to GB1359426A priority Critical patent/GB259501A/en
Publication of GB259501A publication Critical patent/GB259501A/en
Expired legal-status Critical Current

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.
GB1359426A 1926-05-28 1926-05-28 Improvements in and relating to ophthalmic lenses Expired GB259501A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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