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US5229797A
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Multifocal diffractive ophthalmic lenses
Assignee: 3M Co
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Filing: 1990-08-08
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Granted: 1993-07-20
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Expires: 2010-08-08
Abstract
Abstract A lens according to the invention has diffractive power and two primary foci, where one focus is associated with the first diffractive order and one with the second diffractive order.
Inventors
- 👤 John A. Futhey
- 👤 Michael J. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:34
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; A61F2/1616; A61F2/1618; A61F2/1654; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/06; A61F2/1648; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
A multifocal ophthalmic lens having two primary optical powers both resulting from the combined effects of diffraction and refraction, said lens comprising at least one surface having a plurality of diffractive zones including a central zone and a plurality of concentric annular zones each zone separated from an adjacent zone by an optical step having an optical height substantially equal to three-halves of a design wavelength.
Claim 2
Dependent Claim
66 words
A multifocal ophthalmic lens having two primary optical powers both resulting from the combined effects of diffraction and refraction, said lens comprising at least one surface having a plurality of diffractive zones including a central zone and a plurality of concentric annular zones each zone separated from an adjacent zone by an optical step having an optical height substantially equal to three-halves of a design wavelength.
Claim 3
Dependent Claim
23 words
The ophthalmic lens of claim 1 wherein said design wavelength is in the spectral region of greatest photopic sensitivity of the human eye.
Claim 4
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an intraocular lens.
Claim 5
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is a contact lens.
Claim 6
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an artificial cornea.
Claim 7
Dependent Claim
14 words
The multifocal ophthalmic lens of claim 1 wherein said lens is an intralamellar implant.
Claim 8
Dependent Claim
43 words
The ophthalmic lens of claim 1 wherein the central zone has a radius equal to r 0 and the innermost annular zone has a radius equal to r 1 and r 0 2 is equal to r 1 2 -r 0 2 .
Claim 9
Dependent Claim
43 words
The ophthalmic lens of claim 1 wherein the central zone has a radius equal to r 0 and the innermost annular zone has a radius equal to r 1 and r 0 2 is less than r 1 2 -r 0 2 .
Claim 10
Dependent Claim
43 words
The ophthalmic lens of claim 1 wherein the central zone has a radius equal to r 0 and the innermost annular zone has a radius equal to r 1 and r 0 2 is greater than r 1 2 -r 0 2 .
Claim 11
Dependent Claim
16 words
The ophthalmic lens of claim 1 wherein said diffractive zones are provided on a curved surface.
Claim 12
Dependent Claim
12 words
The ophthalmic lens of claim 10 wherein said curved surface is concave.
Claim 13
Dependent Claim
23 words
A lens having diffractive power and having two primary foci wherein said primary foci correspond to the positive first and second diffractive orders.
Claim 14
Dependent Claim
23 words
A lens having diffractive power and having two primary foci wherein said primary foci correspond to the positive first and second diffractive orders.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
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