FR2419257A1 - Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading - Google Patents

Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading

Info

Publication number
FR2419257A1
FR2419257A1 FR7808053A FR7808053A FR2419257A1 FR 2419257 A1 FR2419257 A1 FR 2419257A1 FR 7808053 A FR7808053 A FR 7808053A FR 7808053 A FR7808053 A FR 7808053A FR 2419257 A1 FR2419257 A1 FR 2419257A1
Authority
FR
France
Prior art keywords
zone
blank
reading
lens
multifocal
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.)
Withdrawn
Application number
FR7808053A
Other languages
French (fr)
Inventor
Julien Stenger
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.)
STENGER ET CIE SARL E ET G
Original Assignee
STENGER ET CIE SARL E ET G
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 STENGER ET CIE SARL E ET G filed Critical STENGER ET CIE SARL E ET G
Priority to FR7808053A priority Critical patent/FR2419257A1/en
Publication of FR2419257A1 publication Critical patent/FR2419257A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02CSPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00Optical parts
    • G02C7/02Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
    • G02C7/061Spectacle lenses with progressively varying focal power
    • G02C7/063Shape of the progressive surface
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00Re-forming shaped glass
    • C03B23/02Re-forming glass sheets
    • C03B23/023Re-forming glass sheets by bending
    • C03B23/025Re-forming glass sheets by bending by gravity
    • C03B23/0252Re-forming glass sheets by bending by gravity by gravity only, e.g. sagging
    • GPHYSICS
    • G02OPTICS
    • G02CSPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00Optical parts
    • G02C7/02Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
    • G02C7/061Spectacle lenses with progressively varying focal power

Abstract

The initial glass lens blank has a flat lower surface (a), and a sphero-convex upper surface (b) which is prepolished; the blank also tapers in thickness across its dia. The blank is placed on top of a template made of ceramic or other refractory with a low coefft. of thermal expansion, and heated 4 hrs. at 650 degrees C, so surface (a) sags to assume the profile of the template and thus becomes concave. The convex upper surface (b) is polished, and the thickness of the glass is adjusted to obtain a lens with a progressive alteration in dioptres in the lower, circular zone used for reading etc. Improved focussing in the close range zone of the lens is obtd.
FR7808053A 1978-03-08 1978-03-08 Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading Withdrawn FR2419257A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7808053A FR2419257A1 (en) 1978-03-08 1978-03-08 Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7808053A FR2419257A1 (en) 1978-03-08 1978-03-08 Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading
DE19792908720 DE2908720A1 (en) 1978-03-08 1979-03-06 A process for the production of lenses with progressive effect, and according to the method produced sheen

Publications (1)

Publication Number Publication Date
FR2419257A1 true FR2419257A1 (en) 1979-10-05

Family

ID=9206041

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7808053A Withdrawn FR2419257A1 (en) 1978-03-08 1978-03-08 Multifocal, glass spectacle lens - with progressive alteration in power of zone for close observation or reading

Country Status (2)

Country Link
DE (1) DE2908720A1 (en)
FR (1) FR2419257A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003065109A2 (en) * 2002-01-31 2003-08-07 Opticlear Inc. Progressive lens with reduced distortion

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2109010A7 (en) *
FR403078A (en) * 1908-06-18 1909-10-25 Zeiss Carl Soc A method for transforming, using a vacuum carried out with heating, a lens in a lens spherical deformed
US1414117A (en) * 1921-11-25 1922-04-25 Bausch & Lomb Bifocal or multifocal lens
US1536828A (en) * 1921-11-29 1925-05-05 Bausch & Lomb Method of making toric lenses and lens blanks
GB259501A (en) * 1926-05-28 1926-10-14 American Optical Corp Improvements in and relating to ophthalmic lenses
US1619341A (en) * 1925-08-10 1927-03-01 American Optical Corp Ophthalmic lens
FR1095375A (en) * 1953-11-25 1955-06-01 Comm Ouvriers Lunetiers Soc In optical systems locally variable power
US3130029A (en) * 1959-06-23 1964-04-21 Bausch & Lomb Method for making fused multifocal lenses
FR2294990A1 (en) * 1974-12-16 1976-07-16 American Optical Corp Multifocal length lenses - combining high and low refractive index layers and grinding through the interface
FR2314512A1 (en) * 1975-06-13 1977-01-07 Bush Sydney Lens vision correction and process for its manufacturing
FR2326718A2 (en) * 1973-08-16 1977-04-29 American Optical Corp Trifocal spectacle lens with cosmetic appearance - where there is no distortion of vertical lines viewed through the lens
FR2329427A1 (en) * 1975-10-30 1977-05-27 Essilor Int Process for the production of an ophthalmic lens has a progressively variable focal power, and semifinished puck forming an intermediate product in such process

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2109010A7 (en) *
FR403078A (en) * 1908-06-18 1909-10-25 Zeiss Carl Soc A method for transforming, using a vacuum carried out with heating, a lens in a lens spherical deformed
US1414117A (en) * 1921-11-25 1922-04-25 Bausch & Lomb Bifocal or multifocal lens
US1536828A (en) * 1921-11-29 1925-05-05 Bausch & Lomb Method of making toric lenses and lens blanks
US1619341A (en) * 1925-08-10 1927-03-01 American Optical Corp Ophthalmic lens
GB259501A (en) * 1926-05-28 1926-10-14 American Optical Corp Improvements in and relating to ophthalmic lenses
FR1095375A (en) * 1953-11-25 1955-06-01 Comm Ouvriers Lunetiers Soc In optical systems locally variable power
US3130029A (en) * 1959-06-23 1964-04-21 Bausch & Lomb Method for making fused multifocal lenses
FR2326718A2 (en) * 1973-08-16 1977-04-29 American Optical Corp Trifocal spectacle lens with cosmetic appearance - where there is no distortion of vertical lines viewed through the lens
FR2294990A1 (en) * 1974-12-16 1976-07-16 American Optical Corp Multifocal length lenses - combining high and low refractive index layers and grinding through the interface
FR2314512A1 (en) * 1975-06-13 1977-01-07 Bush Sydney Lens vision correction and process for its manufacturing
FR2329427A1 (en) * 1975-10-30 1977-05-27 Essilor Int Process for the production of an ophthalmic lens has a progressively variable focal power, and semifinished puck forming an intermediate product in such process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003065109A2 (en) * 2002-01-31 2003-08-07 Opticlear Inc. Progressive lens with reduced distortion
WO2003065109A3 (en) * 2002-01-31 2003-10-02 Bernard B Fresco Progressive lens with reduced distortion

Also Published As

Publication number Publication date
DE2908720A1 (en) 1979-09-13

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Legal Events

Date Code Title Description
ST Notification of lapse