GB275460A - Improvements in and relating to ophthalmic lenses - Google Patents

Improvements in and relating to ophthalmic lenses

Info

Publication number
GB275460A
GB275460A GB2952326A GB2952326A GB275460A GB 275460 A GB275460 A GB 275460A GB 2952326 A GB2952326 A GB 2952326A GB 2952326 A GB2952326 A GB 2952326A GB 275460 A GB275460 A GB 275460A
Authority
GB
United Kingdom
Prior art keywords
toughened
lens
blank
untoughened
central portion
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
GB2952326A
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 GB2952326A priority Critical patent/GB275460A/en
Publication of GB275460A publication Critical patent/GB275460A/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

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)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

275,460. Redfern, C. G., (American Optical Co.). Nov. 22, 1926. Spectacle lenses.-Lenses for use in protective goggles and which are also designed to correct the sight of the wearer, are formed from a toughened lens blank, having toughened surface layers and an untoughened central portion. A lens blank 17 of ordinary construction has the surfaces 18, 19 ground thereon to give the required power, but with the thickness left greater than is required in the finished lens. The blank is then edged and placed on a carborundum block 21 recessed to take the surface 19 of the lens. and the whole is heated until the blank approaches a plastic condition, when it is plunged together with the block 21 into a toughening solution. After thus toughening the surfaces they are reground and polished to produce a finished lens with toughened outer surfaces 18, 19 and an untoughened central portion 24. The final polishing is arranged so that the toughened layer is not entirely removed at any point.
GB2952326A 1926-11-22 1926-11-22 Improvements in and relating to ophthalmic lenses Expired GB275460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2952326A GB275460A (en) 1926-11-22 1926-11-22 Improvements in and relating to ophthalmic lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2952326A GB275460A (en) 1926-11-22 1926-11-22 Improvements in and relating to ophthalmic lenses

Publications (1)

Publication Number Publication Date
GB275460A true GB275460A (en) 1927-08-11

Family

ID=10292885

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2952326A Expired GB275460A (en) 1926-11-22 1926-11-22 Improvements in and relating to ophthalmic lenses

Country Status (1)

Country Link
GB (1) GB275460A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690295A (en) * 1983-11-09 1987-09-01 The British Petroleum Company P.L.C. Pressure container with thermoplastic fusible plug
US8454862B2 (en) 2004-07-30 2013-06-04 Novartis Ag Method of creating ophthalmic lenses using modulated energy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690295A (en) * 1983-11-09 1987-09-01 The British Petroleum Company P.L.C. Pressure container with thermoplastic fusible plug
US8454862B2 (en) 2004-07-30 2013-06-04 Novartis Ag Method of creating ophthalmic lenses using modulated energy

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