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GB585913A - Improvements in multi-focal lenses for spectacles or eyeglasses - Google Patents

Improvements in multi-focal lenses for spectacles or eyeglasses

Info

Publication number
GB585913A
GB585913A GB1552441A GB1552441A GB585913A GB 585913 A GB585913 A GB 585913A GB 1552441 A GB1552441 A GB 1552441A GB 1552441 A GB1552441 A GB 1552441A GB 585913 A GB585913 A GB 585913A
Authority
GB
United Kingdom
Prior art keywords
zone
zones
lens
face
lenses
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
GB1552441A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1552441A priority Critical patent/GB585913A/en
Publication of GB585913A publication Critical patent/GB585913A/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
    • G02C7/061—Spectacle lenses with progressively varying focal power

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

585,913. Spectacle lenses. BEACH, H. D: Dec. 2, 1941, No. 15524. [Class 97 (i)] Lenses, or blanks therefor, of uniform refractive index, have a zone 14 of higher curvature on one face 17 and a plurality of narrow zones 16, the curvatures of which gradually lessen away from the zone 14. The zones may be formed by grinding one surface of a thick blank having uniform thickness and plane or spherical concentric faces, and may be polished so as to merge one into the other. Any desired curvature may be worked on the face 12 of the lens. The zones may be concavities in the concave surface of the blank, and the lens may be finished to have a reading zone in the lower part, or as a cataract lons having the zone 14 centrally placed.
GB1552441A 1941-12-02 1941-12-02 Improvements in multi-focal lenses for spectacles or eyeglasses Expired GB585913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1552441A GB585913A (en) 1941-12-02 1941-12-02 Improvements in multi-focal lenses for spectacles or eyeglasses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1552441A GB585913A (en) 1941-12-02 1941-12-02 Improvements in multi-focal lenses for spectacles or eyeglasses

Publications (1)

Publication Number Publication Date
GB585913A true GB585913A (en) 1947-02-28

Family

ID=10060654

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1552441A Expired GB585913A (en) 1941-12-02 1941-12-02 Improvements in multi-focal lenses for spectacles or eyeglasses

Country Status (1)

Country Link
GB (1) GB585913A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155652A (en) * 1984-03-08 1985-09-25 Alexander C Bristol Aspheric spectacle lens blank

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155652A (en) * 1984-03-08 1985-09-25 Alexander C Bristol Aspheric spectacle lens blank

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