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US5076684A
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Multi-focal diffractive ophthalmic lenses
Assignee: 3M Co
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Filing: 1991-02-11
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Granted: 1991-12-31
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Expires: 2011-02-11
Abstract
Abstract A multifocal ophthalmic lens has diffractive power produced by a plurality of concentric zones. The zones have radii that meet the condition R 0 2 <R 1 2 -R 0 2 where R 0 is the radius of the central zone and R 1 is the radius of the first annular zone.
Inventors
- 👤 Michael J. Simpson
- 👤 John A. Futhey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:33
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/189; G02B5/1895; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C7/06; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
72 words
A multifocal ophthalmic lens having optical power, at least a portion of said optical power being produced by diffraction, said lens having a plurality of diffractive zones including a central zone and a plurality of concentric annular zones, said central zone having a radius r 0 and the innermost of said annular zones having a radius r 1 where r 0 2 is less than r 1 2 -r 0 2 .
Claim 2
Dependent Claim
72 words
A multifocal ophthalmic lens having optical power, at least a portion of said optical power being produced by diffraction, said lens having a plurality of diffractive zones including a central zone and a plurality of concentric annular zones, said central zone having a radius r 0 and the innermost of said annular zones having a radius r 1 where r 0 2 is less than r 1 2 -r 0 2 .
Claim 3
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an intraocular lens.
Claim 4
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is a contact lens.
Claim 5
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an artificial cornea.
Claim 6
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an intralamellar implant.
Claim 7
Dependent Claim
28 words
The ophthalmic lens of claim 1 wherein said zones are separated by optical steps having an optical height of one half wavelength for light of a design wavelength.
Claim 8
Dependent Claim
24 words
The ophthalmic lens of claim 1 wherein said design wavelength is in the spectral region of the greatest photopic sensitivity of the human eye.
Claim 9
Dependent Claim
16 words
The ophthalmic lens of claim 1 wherein said diffractive zones are provided on a curved surface.
Claim 10
Dependent Claim
21 words
The ophthalmic lens of claim 8 wherein said zones have radii that are corrected for the curvature of said curved surface.
Claim 11
Dependent Claim
12 words
The ophthalmic lens of claim 8 wherein said curved surface is concave.
Claim 12
Dependent Claim
21 words
The ophthalmic lens of claim 10 wherein said zones have radii that are corrected for the curvature of said curved surface.
Claim 13
Dependent Claim
27 words
The ophthalmic lens of claim 11 wherein said zones are separated by steps having an optical height of one half wavelength for light of a design wavelength.
Claim 14
Dependent Claim
12 words
The ophthalmic lens of claim 8 wherein said curved surface is convex.
Claim 15
Dependent Claim
21 words
The ophthalmic lens of claim 13 wherein said zones have radii that are corrected for the curvature of said curved surface.
Claim 16
Dependent Claim
27 words
The ophthalmic lens of claim 14 wherein said zones are separated by steps having an optical height of one half wavelength for light of a design wavelength.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
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