WO2002003126A1 - Multifocal contact lenses - Google Patents
Multifocal contact lenses Download PDFInfo
- Publication number
- WO2002003126A1 WO2002003126A1 PCT/GB2001/002724 GB0102724W WO0203126A1 WO 2002003126 A1 WO2002003126 A1 WO 2002003126A1 GB 0102724 W GB0102724 W GB 0102724W WO 0203126 A1 WO0203126 A1 WO 0203126A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact lens
- multifocal contact
- zones
- lens according
- segments
- Prior art date
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
- G02C7/042—Simultaneous 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
Definitions
- This invention relates to multifocal contact lenses which have the ability to provide simultaneous near and distance vision to a wearer by projecting two images onto the retina, which images blend into each other.
- Such lenses may be of rigid or of soft material.
- the lens comprises a series of concentric rings each ring zone producing an area having different focal length.
- a disadvantage of this construction is that operation differs according to the diameter of the iris at any one time and thus significant changes occur according to the ambient light.
- An object of this invention is to provide a multifocal contact lens which reduces the disadvantages of the known types.
- a further object is to provide a contact lens which provides a more continuous focus to the eye.
- a multifocal contact lens the surface of the lens providing zones each of differing focal characteristics, characterised in that each said zone extends radially.
- the zones comprise radially extending segments, adjacent segments having differing focal characteristics achieved by a different surface curvature.
- the adjacent zones blend smoothly or steplessly together, preferably through curved transition zones.
- a section through a mid point between the centre of the lens and the periphery and which section extends concentrically about the centre axis has a sinuous profile.
- Fig. 1 shows in perspective view the front surface of a contact lens according to this invention
- Fig. 2 shows a detail view of the edge of the lens of Fig. 1 ,
- Fig. 3 shows a plan view of a second embodiment of lens with twelve radial segments
- Fig. 4 shows a side elevation looking in the direction IV of the lens of Fig. 3, and
- Fig. 5 shows a section on V-V of the lens of Fig. 3,
- Figs. 1 and 2 show one embodiment of a lens according to this invention as example.
- the lens 1 is of any conventional material and is divided into a number of adjacent radially extending segments F and N.
- the segments F define a curvature in the radial direction from the centre C to the edge of the lens with a characteristic for far vision requirements and the segments N define a curvature in the radial direction from the centre C to the edge of the lens with a characteristic for near vision requirements.
- the peaks F define a surface of the lens with a lesser curvature than the surface defined by the troughs N.
- Fig 2 shows a detail of the edge portion of the lens and as may be seen the transitions between the zones blend with a smooth curvature. All the segments merge to a common point at the centre C.
- the construction according to this invention is suitable for any size pupil and will work equally well whether the pupil is enlarged or reduced due to ambient light.
- the arrangement provides a radial configuration for each segment defining the lens surface curvature.
- the adjacent segments may blend into one another smoothly through a curve and in a stepless manner or abruptly through a step.
- the lens also provides infinite variability, by increasing the power on either the near or far zones; by enlarging or reducing either the near or far zones or by increasing or reducing the number of zones totally or in relation to each other.
- the lens may be produced using a lathing technique on a conventional contact lens manufacturing lathe but with a oscillating reciprocating tool head post on a radius attachment to give the varying curvatures as shown on the front surface.
- Figs. 3 to 5 show a further embodiment having twelve radial segments.
- the radial zones are wider and blend together with a wave-like profile as shown in Fig 4 with a thicker apex F and a thinner trough N.
- Each adjacent segment is thus thinner in one part and thicker in another part.
- the number of radial segments provided may be as few as four and as many as desired, theoretically infinite, although there will clearly be a practical limit.
- This invention thus provides a multifocal contact lens (1) with zones each of differing focal characteristics each zone (N) and (F) extending radially.
- the zones (N) and (F) comprise segments radially extending from a common centre (C) with adjacent segments defining different radial curvatures of the surface of the lens producing different focal characteristics.
- the zones as seen in side profile have a sinuous form with the adjacent zones smoothly blending into one another.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01940782A EP1295164A1 (en) | 2000-06-29 | 2001-06-20 | Multifocal contact lenses |
AU2001274282A AU2001274282A1 (en) | 2000-06-29 | 2001-06-20 | Multifocal contact lenses |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0016000A GB0016000D0 (en) | 2000-05-12 | 2000-06-29 | Multifocal contact lenses |
GB0016000.2 | 2000-06-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002003126A1 true WO2002003126A1 (en) | 2002-01-10 |
Family
ID=9894693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2001/002724 WO2002003126A1 (en) | 2000-06-29 | 2001-06-20 | Multifocal contact lenses |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1295164A1 (en) |
AU (1) | AU2001274282A1 (en) |
WO (1) | WO2002003126A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7044597B2 (en) | 2003-12-16 | 2006-05-16 | Bausch & Lomb Incorporated | Multifocal contact lens and method of manufacture thereof |
WO2009017403A1 (en) * | 2007-07-31 | 2009-02-05 | Akkolens International B.V. | Azimuthal and radial progressive ophthalmic optics |
WO2011102719A1 (en) | 2010-02-17 | 2011-08-25 | Akkolens International B.V. | Adjustable chiral ophthalmic lens |
GB2503910A (en) * | 2012-07-11 | 2014-01-15 | Contact Lens Prec Lab Ltd | Multifocal contact lens with two sets of focal length zones and movement-sensitive biasing |
US9880400B2 (en) | 2013-10-04 | 2018-01-30 | Ophtec B.V. | Ophthalmic lens for correcting astigmatism |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4798609A (en) * | 1987-08-24 | 1989-01-17 | Grendahl Dennis T | Radially segmented zone of focus artificial lens |
WO1992006400A1 (en) * | 1990-10-02 | 1992-04-16 | Volk Donald A | Aspheric ophthalmic accommodating lens design for intraocular lens and contact lens |
EP0553959A1 (en) * | 1992-01-28 | 1993-08-04 | JOHNSON & JOHNSON VISION PRODUCTS, INC. | Clear axis, segmented multifocal ophthalmic lens |
-
2001
- 2001-06-20 AU AU2001274282A patent/AU2001274282A1/en not_active Abandoned
- 2001-06-20 WO PCT/GB2001/002724 patent/WO2002003126A1/en not_active Application Discontinuation
- 2001-06-20 EP EP01940782A patent/EP1295164A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4798609A (en) * | 1987-08-24 | 1989-01-17 | Grendahl Dennis T | Radially segmented zone of focus artificial lens |
WO1992006400A1 (en) * | 1990-10-02 | 1992-04-16 | Volk Donald A | Aspheric ophthalmic accommodating lens design for intraocular lens and contact lens |
EP0553959A1 (en) * | 1992-01-28 | 1993-08-04 | JOHNSON & JOHNSON VISION PRODUCTS, INC. | Clear axis, segmented multifocal ophthalmic lens |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7044597B2 (en) | 2003-12-16 | 2006-05-16 | Bausch & Lomb Incorporated | Multifocal contact lens and method of manufacture thereof |
WO2009017403A1 (en) * | 2007-07-31 | 2009-02-05 | Akkolens International B.V. | Azimuthal and radial progressive ophthalmic optics |
WO2011102719A1 (en) | 2010-02-17 | 2011-08-25 | Akkolens International B.V. | Adjustable chiral ophthalmic lens |
US9280000B2 (en) | 2010-02-17 | 2016-03-08 | Akkolens International B.V. | Adjustable chiral ophthalmic lens |
GB2503910A (en) * | 2012-07-11 | 2014-01-15 | Contact Lens Prec Lab Ltd | Multifocal contact lens with two sets of focal length zones and movement-sensitive biasing |
GB2503910B (en) * | 2012-07-11 | 2016-08-10 | Contact Lens Prec Laboratories Ltd | Multifocal Contact Lens |
US9880400B2 (en) | 2013-10-04 | 2018-01-30 | Ophtec B.V. | Ophthalmic lens for correcting astigmatism |
Also Published As
Publication number | Publication date |
---|---|
AU2001274282A1 (en) | 2002-01-14 |
EP1295164A1 (en) | 2003-03-26 |
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