EP0335731A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multi-focal diffractive ophthalmic lenses
Assignee: 3M Co
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Filing: 1989-03-31
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Granted: —
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Expires: 2009-03-31
Abstract
Abstract A multifocal ophthalmic lens has optical power, at least a portion of the optical power being produced by diffraction. The lens has a plurality of diffractive zones including a circular central zone and a plurality of concentric annular zones. The central zone has a radius r0 and the first annular zone has a radius r1 where r1<2> - r0<2> is not equal to r0<2>.
Inventors
- 👤 Michael J. C/O Minnesota Mining And Simpson
- 👤 John A. C/O Minnesota Mining And Futhey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:12
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; A61F2/1654; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/189; G02B5/1895; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 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 r₀ and the innermost of said annular zones having a radius r₁ characterized in that r₀² is not equal to r₁² - r₀².
Claim 2
Dependent Claim
67 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 r₀ and the innermost of said annular zones having a radius r₁ characterized in that r₀² is not equal to r₁² - r₀².
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
14 words
The ophthalmic lens of Claim 1 wherein r₀² is less than r₁² - r₀².
Claim 7
Dependent Claim
14 words
The ophthalmic lens of Claim 1 wherein r₀² is greater than r₁² - r₀².
Claim 8
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 9
Dependent Claim
24 words
The ophthalmic lens of Claim 6 wherein said design wavelength is in the spectral region of the greatest photopic sensitivity of the human eye.
Claim 10
Dependent Claim
16 words
The ophthalmic lens of Claim 1 wherein said diffractive zones are provided on a curved surface.
Claim 11
Dependent Claim
21 words
The ophthalmic lens of Claim 9 wherein said zones have radii that are corrected for the curvature of said curved surface.
References Cited (Backward Citations)
No citation records indexed.
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