GB2033101B - Soft bifocal contact lenses - Google Patents

Soft bifocal contact lenses

Info

Publication number
GB2033101B
GB2033101B GB7927763A GB7927763A GB2033101B GB 2033101 B GB2033101 B GB 2033101B GB 7927763 A GB7927763 A GB 7927763A GB 7927763 A GB7927763 A GB 7927763A GB 2033101 B GB2033101 B GB 2033101B
Authority
GB
United Kingdom
Prior art keywords
lens
prismatic
blank
distance
cutting
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
GB7927763A
Other versions
GB2033101A (en
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.)
MADDEN CONTACT LENSES Ltd
Original Assignee
MADDEN CONTACT LENSES Ltd
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 MADDEN CONTACT LENSES Ltd filed Critical MADDEN CONTACT LENSES Ltd
Priority to GB7927763A priority Critical patent/GB2033101B/en
Publication of GB2033101A publication Critical patent/GB2033101A/en
Application granted granted Critical
Publication of GB2033101B publication Critical patent/GB2033101B/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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/043—Translating type
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/045—Sectorial configuration
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/048—Means for stabilising the orientation of lenses in the eye

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)

Abstract

A soil bifocal contact lens is made by mounting the concave back surface 15 of a lens blank 14 on the convex support surface 11 of a lens cutting lathe and cutting a first convex surface 18 on the front of the blank to produce a distance correction lens with a prismatic component. This can be done by offsetting the surface 11 to locate its centre of curvature 12 off the axis of rotation 13 of the lathe. The position of the lens is then adjusted to cut a second surface 23 in the thicker portion of the prismatic lens with the second surface 23 providing a near correction segment which has a prismatic component less than or of opposite sign to that of the distance lens. The blank is then hydrated to make it soft. In a preferred arrangement the distance and near correction lens portions are given equal and opposite prismatic components by rotating the lens by 180 DEG relative to the support surface 11 before cutting the second surface 23. The lens may be truncated top and bottom and provided with a bottom ledge 31 for stabilising in the eye. <IMAGE>
GB7927763A 1978-10-02 1979-08-09 Soft bifocal contact lenses Expired GB2033101B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7927763A GB2033101B (en) 1978-10-02 1979-08-09 Soft bifocal contact lenses

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7838986 1978-10-02
GB7927763A GB2033101B (en) 1978-10-02 1979-08-09 Soft bifocal contact lenses

Publications (2)

Publication Number Publication Date
GB2033101A GB2033101A (en) 1980-05-14
GB2033101B true GB2033101B (en) 1983-01-26

Family

ID=26269042

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7927763A Expired GB2033101B (en) 1978-10-02 1979-08-09 Soft bifocal contact lenses

Country Status (1)

Country Link
GB (1) GB2033101B (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4555372A (en) * 1981-03-23 1985-11-26 Bausch & Lomb Incorporated Rotational molding of contact lenses
US4407766A (en) * 1981-05-26 1983-10-04 National Patent Development Corporation Molds and procedure for producing truncated contact lenses
US4508436A (en) * 1981-09-28 1985-04-02 Frontier Contact Lenses Of Florida, Inc. Soft toric contact lens
US4573774A (en) * 1981-09-28 1986-03-04 Vistakon, Inc. Soft toric contact lens
US4549794A (en) * 1983-05-05 1985-10-29 Schering Corporation Hydrophilic bifocal contact lens
CA1265688A (en) * 1984-10-17 1990-02-13 Alain Rainville Bi-focal corneal lens and method of making the same
US4854089A (en) * 1985-04-05 1989-08-08 Sola U.S.A. Inc. Method of making a rigid gas permeable bifocal contact lens
FR2615965B1 (en) * 1987-06-01 1989-09-08 Essilor Int ASPHERICAL CONTACT LENS FOR PRESBYTIA CORRECTION
EP0398984B2 (en) * 1988-02-03 2001-01-03 Igel International Limited Improved contact lens design
US5020898A (en) * 1990-01-29 1991-06-04 Schering Corporation Contact lens for correction of astigmatism
NL9301863A (en) * 1993-10-28 1995-05-16 Meurs Optiek B V Van Contact lens with an optical zone with at least one focus.
NL1001540C2 (en) * 1995-10-31 1997-05-02 Procornea Holding Bv Multifocal lens for production of
DE29680953U1 (en) * 1995-10-31 1997-11-06 Procornea Holding B.V., Eerbeek Multifocal lens
US7052132B2 (en) 1999-12-16 2006-05-30 Iolco Pty Ltd. Soft multifocal contact lens
AUPQ468399A0 (en) * 1999-12-16 2000-01-20 Iolco Pty Ltd A contact lens
US6773107B2 (en) 2000-08-17 2004-08-10 Novartis Ag Soft translating contact lens for presbyopia
US6746118B2 (en) * 2001-07-17 2004-06-08 Soft Focal Company, Inc. Bifocal contact lens with secondary prism
US20180196281A1 (en) * 2017-01-06 2018-07-12 eyeBrain Medical, Inc. Prismatic contact lens
US20220113558A1 (en) * 2020-10-13 2022-04-14 Johnson & Johnson Vision Care, Inc. Contact lens position and rotation control using the pressure of the eyelid margin

Also Published As

Publication number Publication date
GB2033101A (en) 1980-05-14

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee