WO1982003129A1 - Lentille bifocale a transition variable - Google Patents

Lentille bifocale a transition variable Download PDF

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Publication number
WO1982003129A1
WO1982003129A1 PCT/US1982/000258 US8200258W WO8203129A1 WO 1982003129 A1 WO1982003129 A1 WO 1982003129A1 US 8200258 W US8200258 W US 8200258W WO 8203129 A1 WO8203129 A1 WO 8203129A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
recited
multifocal ophthalmic
blended
area
Prior art date
Application number
PCT/US1982/000258
Other languages
English (en)
Inventor
Industries Corp Camelot
Alban Judson Lobdell
Tyrus L Weller
Original Assignee
Camelot Ind Corp
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 Camelot Ind Corp filed Critical Camelot Ind Corp
Publication of WO1982003129A1 publication Critical patent/WO1982003129A1/fr

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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

Definitions

  • the present invention relates generally to the field of multifocal ophthalmic lenses and, more particularly, to a one-piece bifocal lens wherein the sharp boundary normally present between the bifocal add portion and the distance portion of the lens is blended together in a variable manner so as to achieve not only desirable optical characteristics, but suitable cosmetic properties as well.
  • plastic multifocal lenses are constructed from a single piece of material and the power differential is achieved by providing different areas of the lens with different surface curvatures and hence, different focal lengths.
  • One common type of bifocal lens is often referred to as an O-Style lens and consists of one sphere of relatively short radius of curvature (the reading segment) applied to a second, larger radius sphere (the distance portion).
  • the intersection of two spheres is normally a circular line and, as a result, in the standard O-Style lens, the reading segment of the lens is clearly delineated from the remainder of the lens by a circular line formed on the surface of the lens. For cosmetic reasons, the presence of such a line is not desirable and, accordingly, efforts have been made to render it less visible.
  • this circular line can be made less visible by a technique known as "blending" in which the surface of the lens in the vicinity of the line is ground and polished to an extent sufficient to make the line essentially disappear. See, for example, U. S. Patent Nos. 1,413,945 and 3,010,366 wherein this concept is discussed.
  • the present invention is directed to a bifocal lens wherein the sharp boundary between the bifocal add and the distance portion is variably blended. Specifically, the lens is blended by different amounts in different portions of the lens depending on the particular lens characteristics that are desired.
  • a typical O-Style lens would be provided with a relatively narrow blended zone at the top of the bifocal portion, and a relatively wide blending zone at the bottom of the bifocal portion with intermediate widths inbetween.
  • FIG. 1 illustrates a variably blended O-Style bifocal lens in accordance with a presently preferred embodiment of the invention.
  • FIG. 2 illustrates a second embodiment of the invention.
  • FIG. 1 illustrates a variably blended O-Style bifocal lens in accordance with, a presently most preferred embodiment of the present invention.
  • the lens is generally represented by reference number 10 and includes a distance portion 11, which constitutes the major portion of the lens, and is used by the wearer for viewing distant objects, and the bifocal addition or reading portion 12, which is used by the wearer to view objects located at a reading distance.
  • Lens 10 will usually be of polymer material manufactured in a mold by casting it against a mold surface as is known in the art, although it could also be of glass as well, if desired.
  • the lens is of onepiece construction in that it is formed from a single piece of material with the power differential between portions 11 and 12 being achieved by providing them with different surface curvatures. Specifically, distance portion 11 has a spherical surface of relatively long radius of curvature, while the reading portion 12 has a spherical surface curvature of much shorter radius.
  • the technique devised in the prior art for rendering this line substantially invisible, or, at least, less visible, is a blending process which consists of grinding or polishing away the line by gradually merging the two spherical surfaces into one another.
  • it is actually the mold surface that is smoothed out in this way to form the blended lens.
  • Reference number 14 generally identifies the blending area, and in the prior art this area is ring shaped and of uniform thickness throughout and is formed by means of a spinning grinding tool as is known in the art. This blended area is really not very useful for viewing purposes because the blending introduces substantial optical distortion into the lens surface.
  • this blending zone By making this blending zone relatively narrow, the area of optical distortion can be minimized, however, at the same time, the transition area is rendered more visible and, thus, less desirable cosmetically. To make the blending zone relatively wide will permit the transition to be made virtually invisible, but, of course, there will then be a larger area of the lens that is not usable for viewing purposes.
  • the present invention recognizes this conflict and provides a lens which is variably blended as is illustrated in FIG. 1.
  • the lens is provided with a relatively narrow blending zone 16 at the top of the bifocal segment and a relatively wide blending zone 17 at the bottom of the segment with a zone of intermediate width being present in between.
  • This design permits optical performance of the lens to be maximized at the top of the bifocal segment which is an area very commonly used for vision, and, at the same time, allows cosmetic hiding to be maximized at the bottom of the bifocal segment which is an area of the lens rarely looked through.
  • the width of the bottom portion of the blended area can be two to three times as wide as the narrow top portion area.
  • the bottom portion 17 could be perhaps, 9 millimeters wide while the top portion 16 could be about 3 millimeters wide.
  • FIG. 2 illustrates a different kind of multifocal lens 20 (which we may consider as a type of O-Style lens) wherein the round reading segment 21 runs into the bottom of the lens.
  • the area of maximum blend will preferably be adjacent the bottom edge of the lens in the vicinity of areas 24 while the area of minimum blend 26 is again at the top of the segment.
  • the invention could also be practiced with yet other types of multifocal lenses as well, and because the invention can take many other forms, it should be readily understood that it is to be limited only insofar as is required by the scope of the following claims.

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  • 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

Lentille ophtalmique (10) multifocale en une piece possedant une zone de melange (14) entre les differentes parties de la lentille afin de rendre moins visible l'intersection entre ces parties. La zone de melange (14) possede une largeur variable, et, notamment, une largeur relativement etroite aux emplacements (16) utilises frequemment pour la vision de maniere a permettre d'obtenir une zone reduite de distorsion optique a ces emplacements, tout en etant relativement large a d'autres emplacements (17) de la lentille qui sont utilises moins souvent pour la vision afin de rendre moins visible de maniere plus efficace l'intersection a ces emplacements.
PCT/US1982/000258 1981-03-09 1982-03-01 Lentille bifocale a transition variable WO1982003129A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24187981A 1981-03-09 1981-03-09
US241879810309 1981-03-09

Publications (1)

Publication Number Publication Date
WO1982003129A1 true WO1982003129A1 (fr) 1982-09-16

Family

ID=22912532

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1982/000258 WO1982003129A1 (fr) 1981-03-09 1982-03-01 Lentille bifocale a transition variable

Country Status (2)

Country Link
EP (1) EP0073816A1 (fr)
WO (1) WO1982003129A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0307876A2 (fr) * 1987-09-14 1989-03-22 Opticorp Inc. Lentilles ophtalmiques
US5861934A (en) * 1996-05-06 1999-01-19 Innotech, Inc. Refractive index gradient lens
US8297751B2 (en) 2010-04-22 2012-10-30 Carl Zeiss Vision Inc. Multi-focal lenses with segmented boundaries
US9618774B2 (en) 2014-02-10 2017-04-11 Shamir Optical Industry Ltd. Quasi progressive lenses for eyewear
CN111474739A (zh) * 2020-05-12 2020-07-31 浙江东方光学科技有限公司 一种大视场无界线双光镜片
WO2021198362A1 (fr) * 2020-03-31 2021-10-07 Essilor International Élément de lentille

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1580282A (en) * 1923-04-28 1926-04-13 American Optical Corp Multifocal lens
US1734428A (en) * 1926-12-01 1929-11-05 Bausch & Lomb Method of making fused multifocal lenses
US1873676A (en) * 1928-05-15 1932-08-23 American Optical Corp Ophthalmic lens
CA583087A (fr) * 1955-06-04 1959-09-15 J. Davenport Lawrence Lentille a puissance variable
US4274717A (en) * 1979-05-18 1981-06-23 Younger Manufacturing Company Ophthalmic progressive power lens and method of making same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1580282A (en) * 1923-04-28 1926-04-13 American Optical Corp Multifocal lens
US1734428A (en) * 1926-12-01 1929-11-05 Bausch & Lomb Method of making fused multifocal lenses
US1873676A (en) * 1928-05-15 1932-08-23 American Optical Corp Ophthalmic lens
CA583087A (fr) * 1955-06-04 1959-09-15 J. Davenport Lawrence Lentille a puissance variable
US4274717A (en) * 1979-05-18 1981-06-23 Younger Manufacturing Company Ophthalmic progressive power lens and method of making same

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0307876A2 (fr) * 1987-09-14 1989-03-22 Opticorp Inc. Lentilles ophtalmiques
US4869588A (en) * 1987-09-14 1989-09-26 Opticorp, Inc. Non-progressive multifocal ophthamic lenses
EP0307876A3 (fr) * 1987-09-14 1990-07-25 Opticorp Inc. Lentilles ophtalmiques
US5861934A (en) * 1996-05-06 1999-01-19 Innotech, Inc. Refractive index gradient lens
US8297751B2 (en) 2010-04-22 2012-10-30 Carl Zeiss Vision Inc. Multi-focal lenses with segmented boundaries
US9618774B2 (en) 2014-02-10 2017-04-11 Shamir Optical Industry Ltd. Quasi progressive lenses for eyewear
US10409087B2 (en) 2014-02-10 2019-09-10 Shamir Optical Industry Ltd. Quasi progressive lenses for eyewear
US11226496B2 (en) 2014-02-10 2022-01-18 Shamir Optical Industry Ltd. Quasi progressive lenses for eyewear
WO2021198362A1 (fr) * 2020-03-31 2021-10-07 Essilor International Élément de lentille
EP4324631A3 (fr) * 2020-03-31 2024-03-27 Essilor International Élément de lentille
CN111474739A (zh) * 2020-05-12 2020-07-31 浙江东方光学科技有限公司 一种大视场无界线双光镜片

Also Published As

Publication number Publication date
EP0073816A1 (fr) 1983-03-16

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