GB2192291A - Progressive power contact lens - Google Patents

Progressive power contact lens Download PDF

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Publication number
GB2192291A
GB2192291A GB8605351A GB8605351A GB2192291A GB 2192291 A GB2192291 A GB 2192291A GB 8605351 A GB8605351 A GB 8605351A GB 8605351 A GB8605351 A GB 8605351A GB 2192291 A GB2192291 A GB 2192291A
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GB
Grant status
Application
Patent type
Prior art keywords
lens
power
radius
design allows
contact lens
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
GB8605351A
Other versions
GB2192291B (en )
GB8605351D0 (en )
Inventor
Anil K Gupta
Original Assignee
Anil K Gupta
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

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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
    • G02C7/04Contact lenses for the eyes
    • G02C7/041Contact lenses for the eyes bifocal; multifocal
    • G02C7/044Annular configuration, e.g. pupil tuned
    • 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
    • G02C7/04Contact lenses for the eyes
    • G02C7/041Contact lenses for the eyes bifocal; multifocal
    • G02C7/043Translating type
    • 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

A progressive power contact lens comprises a distance vision central portion and an aspherical peripheral portion of progressive power.

Description

SPECIFICATION Invention of varifocal contact lens.

Contact Lenses has been with us for very long time but to this state all the contact lenses are available either in single vision or in bifocal form. Bifocal forms are mainly of spectacle shape which have proved to be difficult and cumbersome to fit and patient's inability to adapt to them satisfactarily. Eye being very sensitive organ of the human body finds these lenses unacceptable because they insult the cornea and the eye lids.

My invention of varifocal contact lens does not harm the eye in any way. As the enclosed diagrame shows the construction of the contact lens has distance centre portion and peripheral portion of aspheric construction. Aspheric curve has a different radius at every point. The front centre optic radius can be calculated given the following parametres: Back centre optic radius Power of the lens Centre thickness of the lens Refractive index of the material The front peripheral radius is spherical surface which is calculated when the following parametres are known: Third peripheral radius at a given point (determined by the fitting of the lens) Addition power of the lens.

Physical thickness at the point.

Refractive index of the material.

As the back surface is aspherical up to the edge of the back centre optic diametre diameter and the front surface is spherical, of two radii, front central optic radius and front optical prepheral optical radius.

Central portion of the lens will produce distance power while the peripheral radius will produce a different power at every point.

To construct a varifocal lens we need to calculate a set of settings for the lathe. This is best illustrated by flow chart diagrame.

Following prescription is a typical forivarifocal specification Back cenetral optic radius.

Back Central optic diameter.

Overall diameter.

Edge lift Power ofthe lens (distance) Maximum addiction.

Diameter at the point of maximum addition.

Centre thickness of the lens.

Refractive index of the material.

All the above specifications will be needed to calculate the following lathe settings.

Back peripheral radius (r2) Off set Angie FEED To calculate the front optic radius-the following specifications will be used: Back central-optic radius.

DISTANCE POWER of the lens.

Centre thickness of the lens.

Refractive index of the material.

To calculate the third radius at the maximum addition point the following data will be used: Overall diameter.

Back centre optic diameter.

Second peripheral radius.

Edge lift.

Back central optic radius.

To calculate the front optical peripheral radius the following data is required:third radius.

Physical thickness at maximum addition point.

Power of the lens at the- pi̲nt' (distance+reading).

Refractive index of the material.

Lathe and Lens Calculations.

Edge Lift (E.L.)=b2(1-1) 2 r1 r2 Where r2 is peripheral radius.

b is half of periphery i.e. from the edge of back central optic diameter to the overall diameter.

r1 is Back Central optic radius.

E.L. is defined as the perpendicular distancefrom the projection of the back centre optic surface to the edge of the lens.

OFFSET=B.C.O.D.(r2-r1) 2r, where values r, and r2 are same as above B.C.O.D.-is back central optic diameter.

FEED=(r2-r1)2-(OFFSET)2 F1 (Front central optic radius=(1 -n) X 1000.

r1 f1= 1000 F1 f'1=F1- Ct n F',= 1000 f 1 F2=F'1 +B V P (Back vertex power) F.C.0.R.= 1-n F2 SEE DIAGRAMME.

ANGLE. sin 0= B C.O.D.

r1 Calculate r3 (any point on the periphery of the lens to the geometric centre of the lens) saggita of O.D. with r2 saggitta of B.C.O.D. with B.C.O.R.

saggitta of B.C.O.D. with r2 saggitta of max. diameter of the add with r2. <img class="EMIRef" id="026923436-00020001" />

r is any radius and y is half the diameter.

S (GD) Total sag of the iens=B.C.O.R. on B.C.O.D.+O.D. on r2-r2 on B.C.O.D.

S, (TD) sag from B.F.O.D. TO O.D.=r2on O.D.-r2 on B.C.O.D.

S2 (ED) is variable according to the maximum add diameter and must be divided proportionally according to S,.

GE=S3=S-S2 r3=CR=The distance between geometric centre to the max. addition point.

CE=B.C.O.R.S3 <img class="EMIRef" id="026923436-00030001" />

To calculate Second front optic peripheral radius, Distance power+Reading power=Reading Rx F3 (1 -n) x 1000 r3 f3= 1000 F3 f= 1000 F'3 f3=F3- pt n where pt is physical thickness at maximum addition point.

F'3= 1000 ft3 F4=F3+(BVP) F.P.O.R. '(r4)= 1-n F2

Claims (10)

1. Power in the reading area will increase gradually.
2. there is no sudden jump from distance to the reading portion.
3. This lens design allows the wearer to look above and below the eye level for close distances.
4. The gradual power is concentric which fulfills the claim no 3.
5. Lens can be made to any perameter without restrictions.
6. The lens design allows the fitter to determine any central clearance and edge clearance without compromising the fitting of the lens.
7. The lens design allows the fitter to increase or decrease the graduation of power in the reading portion by varing the edge lift of the lens.
8. The back central optic radius and the periphery have no sharp transition so there is no damage to the cornea.
9. The adaptation period for the wearer is no longer than the single vision contact lens.
10. There are no aberrations in the lens as it is made from one piece of material.
GB8605351A 1986-03-04 1986-03-04 Progressive power contact lens. Expired - Fee Related GB2192291B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8605351A GB2192291B (en) 1986-03-04 1986-03-04 Progressive power contact lens.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8605351A GB2192291B (en) 1986-03-04 1986-03-04 Progressive power contact lens.

Publications (3)

Publication Number Publication Date
GB8605351D0 GB8605351D0 (en) 1986-04-09
GB2192291A true true GB2192291A (en) 1988-01-06
GB2192291B GB2192291B (en) 1990-08-22

Family

ID=10594033

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8605351A Expired - Fee Related GB2192291B (en) 1986-03-04 1986-03-04 Progressive power contact lens.

Country Status (1)

Country Link
GB (1) GB2192291B (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5225858A (en) * 1987-06-01 1993-07-06 Valdemar Portney Multifocal ophthalmic lens
GB2301196A (en) * 1995-05-24 1996-11-27 Bausch & Lomb Contact lens having spherical central zone and aspheric annular zone
US5702440A (en) * 1996-01-26 1997-12-30 Allergan Multifocal ophthalmic lens for dim-lighting conditions
US5864378A (en) * 1996-05-21 1999-01-26 Allergan Enhanced monofocal IOL or contact lens
WO1999008147A1 (en) * 1997-08-07 1999-02-18 Vista Optics Limited Contact lens
US6210005B1 (en) 1999-02-04 2001-04-03 Valdemar Portney Multifocal ophthalmic lens with reduced halo size
US6231603B1 (en) 1998-11-10 2001-05-15 Allergan Sales, Inc. Accommodating multifocal intraocular lens
US6270218B1 (en) * 1998-10-26 2001-08-07 Johnson & Johnson Vision Products, Inc. Contact lenses with off-axis bevel
US8182531B2 (en) 2006-12-22 2012-05-22 Amo Groningen B.V. Accommodating intraocular lenses and associated systems, frames, and methods
US8465544B2 (en) 2006-12-29 2013-06-18 Abbott Medical Optics Inc. Accommodating intraocular lens
US8545556B2 (en) 2002-10-25 2013-10-01 Abbott Medical Optics Inc. Capsular intraocular lens implant
US8814934B2 (en) 2006-12-29 2014-08-26 Abbott Medical Optics Inc. Multifocal accommodating intraocular lens
US9011532B2 (en) 2009-06-26 2015-04-21 Abbott Medical Optics Inc. Accommodating intraocular lenses
US9039760B2 (en) 2006-12-29 2015-05-26 Abbott Medical Optics Inc. Pre-stressed haptic for accommodating intraocular lens
US9271830B2 (en) 2002-12-05 2016-03-01 Abbott Medical Optics Inc. Accommodating intraocular lens and method of manufacture thereof
US9421089B2 (en) 2007-07-05 2016-08-23 Visiogen, Inc. Intraocular lens with post-implantation adjustment capabilities
US9504560B2 (en) 2002-01-14 2016-11-29 Abbott Medical Optics Inc. Accommodating intraocular lens with outer support structure
US9603703B2 (en) 2009-08-03 2017-03-28 Abbott Medical Optics Inc. Intraocular lens and methods for providing accommodative vision
US9636213B2 (en) 2005-09-30 2017-05-02 Abbott Medical Optics Inc. Deformable intraocular lenses and lens systems
US9814570B2 (en) 1999-04-30 2017-11-14 Abbott Medical Optics Inc. Ophthalmic lens combinations
US9968441B2 (en) 2008-03-28 2018-05-15 Johnson & Johnson Surgical Vision, Inc. Intraocular lens having a haptic that includes a cap
US9987125B2 (en) 2012-05-02 2018-06-05 Johnson & Johnson Surgical Vision, Inc. Intraocular lens with shape changing capability to provide enhanced accomodation and visual acuity

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6790232B1 (en) 1999-04-30 2004-09-14 Advanced Medical Optics, Inc. Multifocal phakic intraocular lens
US6616692B1 (en) 1999-04-30 2003-09-09 Advanced Medical Optics, Inc. Intraocular lens combinations
US6406494B1 (en) 1999-04-30 2002-06-18 Allergan Sales, Inc. Moveable intraocular lens
US6599317B1 (en) 1999-09-17 2003-07-29 Advanced Medical Optics, Inc. Intraocular lens with a translational zone
US6551354B1 (en) 2000-03-09 2003-04-22 Advanced Medical Optics, Inc. Accommodating intraocular lens
US6547822B1 (en) 2000-05-03 2003-04-15 Advanced Medical Optics, Inc. Opthalmic lens systems
US6554859B1 (en) 2000-05-03 2003-04-29 Advanced Medical Optics, Inc. Accommodating, reduced ADD power multifocal intraocular lenses
US6537317B1 (en) 2000-05-03 2003-03-25 Advanced Medical Optics, Inc. Binocular lens systems
US6660035B1 (en) 2000-08-02 2003-12-09 Advanced Medical Optics, Inc. Accommodating intraocular lens with suspension structure
US20030078658A1 (en) 2001-01-25 2003-04-24 Gholam-Reza Zadno-Azizi Single-piece accomodating intraocular lens system
US8062361B2 (en) 2001-01-25 2011-11-22 Visiogen, Inc. Accommodating intraocular lens system with aberration-enhanced performance
US20030078657A1 (en) 2001-01-25 2003-04-24 Gholam-Reza Zadno-Azizi Materials for use in accommodating intraocular lens system
US6576012B2 (en) 2001-03-28 2003-06-10 Advanced Medical Optics, Inc. Binocular lens systems
US6638305B2 (en) 2001-05-15 2003-10-28 Advanced Medical Optics, Inc. Monofocal intraocular lens convertible to multifocal intraocular lens
US20050131535A1 (en) 2003-12-15 2005-06-16 Randall Woods Intraocular lens implant having posterior bendable optic
US7780729B2 (en) 2004-04-16 2010-08-24 Visiogen, Inc. Intraocular lens

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB939016A (en) * 1961-08-03 1963-10-09 Wilhelm Peter Soehnges Corneal contact lens
GB1156454A (en) * 1965-10-04 1969-06-25 David Volk Aspheric Corneal Contact Lens Series
GB1433782A (en) * 1973-04-28 1976-04-28 Vickrage J D M Contact lens
GB1536891A (en) * 1976-02-12 1978-12-29 Volk D Ophthalmic lens for presbyopia and aphakia
GB2026715A (en) * 1978-05-04 1980-02-06 Spofa Vereinigte Pharma Werke Hydrophilic contact lens
GB1561892A (en) * 1975-10-08 1980-03-05 Jessen Inc Wesley Lens and method and apparatus for forming the same
GB2059102A (en) * 1979-09-24 1981-04-15 Breger Joseph L Presbyopic contact lens
GB2117130A (en) * 1982-03-10 1983-10-05 American Optical Corp Contact lens having lateral carrier
GB2139375A (en) * 1983-04-21 1984-11-07 Benjamin Nuchman Continuously variable contact lens
US4525043A (en) * 1977-11-11 1985-06-25 Leonard Bronstein Contact lens

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB939016A (en) * 1961-08-03 1963-10-09 Wilhelm Peter Soehnges Corneal contact lens
GB1156454A (en) * 1965-10-04 1969-06-25 David Volk Aspheric Corneal Contact Lens Series
GB1433782A (en) * 1973-04-28 1976-04-28 Vickrage J D M Contact lens
GB1561892A (en) * 1975-10-08 1980-03-05 Jessen Inc Wesley Lens and method and apparatus for forming the same
GB1536891A (en) * 1976-02-12 1978-12-29 Volk D Ophthalmic lens for presbyopia and aphakia
US4525043A (en) * 1977-11-11 1985-06-25 Leonard Bronstein Contact lens
GB2026715A (en) * 1978-05-04 1980-02-06 Spofa Vereinigte Pharma Werke Hydrophilic contact lens
GB2059102A (en) * 1979-09-24 1981-04-15 Breger Joseph L Presbyopic contact lens
GB2117130A (en) * 1982-03-10 1983-10-05 American Optical Corp Contact lens having lateral carrier
GB2139375A (en) * 1983-04-21 1984-11-07 Benjamin Nuchman Continuously variable contact lens

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5225858A (en) * 1987-06-01 1993-07-06 Valdemar Portney Multifocal ophthalmic lens
GB2301196B (en) * 1995-05-24 1999-08-04 Bausch & Lomb Contact lens
GB2301196A (en) * 1995-05-24 1996-11-27 Bausch & Lomb Contact lens having spherical central zone and aspheric annular zone
US6221105B1 (en) 1996-01-26 2001-04-24 Allergan Multifocal ophthalmic lens
US5919229A (en) * 1996-01-26 1999-07-06 Allergan Multifocal opthalmic lens
US6576011B2 (en) 1996-01-26 2003-06-10 Advanced Medical Optics, Inc. Multifocal ophthalmic lens
US5702440A (en) * 1996-01-26 1997-12-30 Allergan Multifocal ophthalmic lens for dim-lighting conditions
US6126286A (en) * 1996-05-21 2000-10-03 Allergan Enhanced monofocal ophthalmic lens
US5864378A (en) * 1996-05-21 1999-01-26 Allergan Enhanced monofocal IOL or contact lens
WO1999008147A1 (en) * 1997-08-07 1999-02-18 Vista Optics Limited Contact lens
US6270218B1 (en) * 1998-10-26 2001-08-07 Johnson & Johnson Vision Products, Inc. Contact lenses with off-axis bevel
US6231603B1 (en) 1998-11-10 2001-05-15 Allergan Sales, Inc. Accommodating multifocal intraocular lens
US6210005B1 (en) 1999-02-04 2001-04-03 Valdemar Portney Multifocal ophthalmic lens with reduced halo size
US6557998B2 (en) 1999-02-04 2003-05-06 Advanced Medical Optics, Inc. Multifocal ophthalmic lens with reduced halo size
US6435681B2 (en) 1999-02-04 2002-08-20 Valdemar Portney Multifocal ophthalmic lens with reduced halo size
US9814570B2 (en) 1999-04-30 2017-11-14 Abbott Medical Optics Inc. Ophthalmic lens combinations
US9504560B2 (en) 2002-01-14 2016-11-29 Abbott Medical Optics Inc. Accommodating intraocular lens with outer support structure
US8545556B2 (en) 2002-10-25 2013-10-01 Abbott Medical Optics Inc. Capsular intraocular lens implant
US8585758B2 (en) 2002-10-25 2013-11-19 Abbott Medical Optics Inc. Accommodating intraocular lenses
US9271830B2 (en) 2002-12-05 2016-03-01 Abbott Medical Optics Inc. Accommodating intraocular lens and method of manufacture thereof
US9636213B2 (en) 2005-09-30 2017-05-02 Abbott Medical Optics Inc. Deformable intraocular lenses and lens systems
US8182531B2 (en) 2006-12-22 2012-05-22 Amo Groningen B.V. Accommodating intraocular lenses and associated systems, frames, and methods
US8496701B2 (en) 2006-12-22 2013-07-30 Amo Groningen B.V. Accommodating intraocular lenses and associated systems, frames, and methods
US8814934B2 (en) 2006-12-29 2014-08-26 Abbott Medical Optics Inc. Multifocal accommodating intraocular lens
US9039760B2 (en) 2006-12-29 2015-05-26 Abbott Medical Optics Inc. Pre-stressed haptic for accommodating intraocular lens
US8465544B2 (en) 2006-12-29 2013-06-18 Abbott Medical Optics Inc. Accommodating intraocular lens
US9421089B2 (en) 2007-07-05 2016-08-23 Visiogen, Inc. Intraocular lens with post-implantation adjustment capabilities
US9968441B2 (en) 2008-03-28 2018-05-15 Johnson & Johnson Surgical Vision, Inc. Intraocular lens having a haptic that includes a cap
US9011532B2 (en) 2009-06-26 2015-04-21 Abbott Medical Optics Inc. Accommodating intraocular lenses
US10052194B2 (en) 2009-06-26 2018-08-21 Johnson & Johnson Surgical Vision, Inc. Accommodating intraocular lenses
US9603703B2 (en) 2009-08-03 2017-03-28 Abbott Medical Optics Inc. Intraocular lens and methods for providing accommodative vision
US10105215B2 (en) 2009-08-03 2018-10-23 Johnson & Johnson Surgical Vision, Inc. Intraocular lens and methods for providing accommodative vision
US9987125B2 (en) 2012-05-02 2018-06-05 Johnson & Johnson Surgical Vision, Inc. Intraocular lens with shape changing capability to provide enhanced accomodation and visual acuity

Also Published As

Publication number Publication date Type
GB2192291B (en) 1990-08-22 grant
GB8605351D0 (en) 1986-04-09 grant

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PCNP Patent ceased through non-payment of renewal fee