GB191000891A - Improvements in Bifocal Spectacle Glasses. - Google Patents

Improvements in Bifocal Spectacle Glasses.

Info

Publication number
GB191000891A
GB191000891A GB191000891DA GB191000891A GB 191000891 A GB191000891 A GB 191000891A GB 191000891D A GB191000891D A GB 191000891DA GB 191000891 A GB191000891 A GB 191000891A
Authority
GB
United Kingdom
Prior art keywords
lenses
spectacle glasses
bifocal spectacle
diopters
millimetres
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
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
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 Carl Zeiss AG filed Critical Carl Zeiss AG
Application granted granted Critical
Publication of GB191000891A publication Critical patent/GB191000891A/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

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)

Abstract

891. Zeiss, C., [Firm of]. Feb. 1, 1909, [Convention date]. Spectacle lenses. - In meniscus lenses approximately astigmatically corrected according to the following equation:- in which r' is the radius of the convex surface in millimeters, and D is the focal power in diopters, the distance d between the vertices of the primary and secondary lenses is made equal to or less than 10 millimetres.
GB191000891D 1909-02-01 1910-01-13 Improvements in Bifocal Spectacle Glasses. Expired GB191000891A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE191000891X 1909-02-01

Publications (1)

Publication Number Publication Date
GB191000891A true GB191000891A (en) 1910-07-14

Family

ID=32521514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191000891D Expired GB191000891A (en) 1909-02-01 1910-01-13 Improvements in Bifocal Spectacle Glasses.

Country Status (1)

Country Link
GB (1) GB191000891A (en)

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