GB191417820A - Improvements in Multi-focal Lenses. - Google Patents

Improvements in Multi-focal Lenses.

Info

Publication number
GB191417820A
GB191417820A GB191417820DA GB191417820A GB 191417820 A GB191417820 A GB 191417820A GB 191417820D A GB191417820D A GB 191417820DA GB 191417820 A GB191417820 A GB 191417820A
Authority
GB
United Kingdom
Prior art keywords
lenses
segments
minor
focal lenses
spectacle 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
Inventor
Andrew Jay Cross
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
Application granted granted Critical
Publication of GB191417820A publication Critical patent/GB191417820A/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

Abstract

17,820. Cross, A. J. July 28. Spectacle lenses. - In multi-focal spectacle lenses, the optical axes 5, 6 of the minor segments 2, 3 pass through the middle points of the inner edges of such segments and are decentred with respect to the axis 4 of the principal lens 1. The principal lens may have two or more minor lenses superposed upon it in this way.
GB191417820D 1914-07-28 1914-07-28 Improvements in Multi-focal Lenses. Expired GB191417820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191417820T 1914-07-28

Publications (1)

Publication Number Publication Date
GB191417820A true GB191417820A (en) 1915-03-18

Family

ID=34360897

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191417820D Expired GB191417820A (en) 1914-07-28 1914-07-28 Improvements in Multi-focal Lenses.

Country Status (1)

Country Link
GB (1) GB191417820A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2950158A1 (en) * 2009-09-14 2011-03-18 Michel Louis Marie Gigoux Multifocal glasses for presbyopes, have four plates horizontally arranged over specific width and exhibiting different correction powers for presbyopia, where correction powers of plates are progressive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2950158A1 (en) * 2009-09-14 2011-03-18 Michel Louis Marie Gigoux Multifocal glasses for presbyopes, have four plates horizontally arranged over specific width and exhibiting different correction powers for presbyopia, where correction powers of plates are progressive

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