CA2253786A1 - Refractive index gradient lens - Google Patents

Refractive index gradient lens

Info

Publication number
CA2253786A1
CA2253786A1 CA002253786A CA2253786A CA2253786A1 CA 2253786 A1 CA2253786 A1 CA 2253786A1 CA 002253786 A CA002253786 A CA 002253786A CA 2253786 A CA2253786 A CA 2253786A CA 2253786 A1 CA2253786 A1 CA 2253786A1
Authority
CA
Canada
Prior art keywords
refractive index
layers
lens
transition
layer
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.)
Granted
Application number
CA002253786A
Other languages
French (fr)
Other versions
CA2253786C (en
Inventor
Ronald D. Blum
Amitava Gupta
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.)
EssilorLuxottica SA
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
Publication of CA2253786A1 publication Critical patent/CA2253786A1/en
Application granted granted Critical
Publication of CA2253786C publication Critical patent/CA2253786C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00355—Production of simple or compound lenses with a refractive index gradient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0073—Optical laminates
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/12—Locally varying refractive index, gradient index lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/16—Laminated or compound lenses

Abstract

An optical product such as an optical lens, or semi-finished lens blank (10) is provided comprising a composite of at least three different and separately applied layers (40), each layer having a different refractive index which allow for a progressive multifocal lens having a wide and natural progression of vision when looking from far to near. In addition, a method is provided for simply, quickly and inexpensively manufacturing a composite refractive gradient progressive multifocal lens. A transition zone (45) disposed between a base and an outer layer (50) includes a distinct and separately applied transition layer or layers (40) having an effective refractive index which is intermediate between the refractive indices of the base and outer layers, and preferably approximates the geometric mean of the refractive indices of the base and outer layers. This transition zone may include multiple transition layers, with each transition layer having a different and distinct refractive index. The lens is substantially free of unwanted peripheral astigmatism, incorporates a wide reading zone and is easy to fit a patient and possesses a cosmetic appearance which is mostly invisible.
CA002253786A 1996-05-06 1997-04-15 Refractive index gradient lens Expired - Fee Related CA2253786C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/643,656 1996-05-06
US08/643,656 US5861934A (en) 1996-05-06 1996-05-06 Refractive index gradient lens
PCT/US1997/006035 WO1997042530A1 (en) 1996-05-06 1997-04-15 Refractive index gradient lens

Publications (2)

Publication Number Publication Date
CA2253786A1 true CA2253786A1 (en) 1997-11-13
CA2253786C CA2253786C (en) 2006-08-15

Family

ID=24581743

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002253786A Expired - Fee Related CA2253786C (en) 1996-05-06 1997-04-15 Refractive index gradient lens

Country Status (14)

Country Link
US (1) US5861934A (en)
EP (1) EP0975993B1 (en)
JP (1) JP2001519916A (en)
CN (1) CN1171099C (en)
AU (1) AU712186B2 (en)
BR (1) BR9709890A (en)
CA (1) CA2253786C (en)
DE (1) DE69729584T2 (en)
ES (1) ES2222513T3 (en)
IL (1) IL126785A (en)
MY (1) MY114737A (en)
RU (1) RU2193225C2 (en)
TW (1) TW325523B (en)
WO (1) WO1997042530A1 (en)

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Also Published As

Publication number Publication date
US5861934A (en) 1999-01-19
EP0975993B1 (en) 2004-06-16
AU712186B2 (en) 1999-10-28
CN1217063A (en) 1999-05-19
IL126785A0 (en) 2000-01-28
AU2727297A (en) 1997-11-26
EP0975993A4 (en) 2000-02-02
MY114737A (en) 2002-12-31
ES2222513T3 (en) 2005-02-01
CN1171099C (en) 2004-10-13
JP2001519916A (en) 2001-10-23
EP0975993A1 (en) 2000-02-02
DE69729584T2 (en) 2005-08-25
BR9709890A (en) 1999-08-10
RU2193225C2 (en) 2002-11-20
TW325523B (en) 1998-01-21
DE69729584D1 (en) 2004-07-22
CA2253786C (en) 2006-08-15
IL126785A (en) 2001-07-24
WO1997042530A1 (en) 1997-11-13

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