EP0457553A2
Expired / Lapsed
EP
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Multifocal multizone diffractive ophthalmic lenses
Assignee: Iolab Corp
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Filing: 1991-05-14
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Granted: —
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Expires: 2011-05-14
Abstract
Abstract Multifocal lenses for improving vision are disclosed. The lenses of the present invention use at least one diffractive zone located in a defined portion of the surface of a refractive lens to achieve highly efficient multifocal vision by providing nearly 100% efficiency in the +1 diffractive order. The lenses disclosed may be used for both contact lenses and intraocular lens as well as other vision correcting applications.
Inventors
- 👤 Donn M. Silberman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 04:24
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; A61F2/1654; A61F2/1656; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/188; G02C7/042; G02C7/045; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
94 words
A multifocal lens for correcting vision comprising: a basic lens element having a basic lens power and a basic focal length; and one or more diffractive elements covering one or more zones of said basic lens element and having a diffractive power, whereby a portion of the light travelling through said lens is focused at said basic focal length by said basic lens power, and another portion of the light traveling through said lens is focused at a different focal length by the combined power of said basic lens element and said diffractive elements.
Claim 2
Dependent Claim
12 words
The lens of claim 1, wherein said lens is a contact lens.
Claim 3
Dependent Claim
12 words
The lens of claim 1, wherein said lens is an intraocular lens.
Claim 4
Dependent Claim
13 words
The lens of claim 1, wherein said basic power is provided by refraction.
Claim 5
Dependent Claim
13 words
The lens of claim 4, wherein said basic lens comprises a biconvex lens.
Claim 6
Dependent Claim
14 words
The lens of claim 4, wherein said basic lens element comprises a meniscus lens.
Claim 7
Dependent Claim
14 words
The lens of claim 4, wherein said basic lens element comprises a piano-convex lens.
Claim 8
Dependent Claim
16 words
The lens of claim 1, wherein said diffractive zones are arrayed in a substantially annular pattern.
Claim 9
Dependent Claim
15 words
The lens of claim 1, wherein said diffractive zones are arranged as alternate semi-circular areas.
Claim 10
Dependent Claim
16 words
The lens of claim 1, wherein said diffractive zones are arrayed as alternating quarter circular areas.
Claim 11
Dependent Claim
30 words
The lens of claim 8, wherein said diffractive element comprises an annular zone having an inner diameter greater than zero and an outer diameter less than diameter of said lens.
Claim 12
Dependent Claim
25 words
The lens of claim 11, wherein the inner diameter of said diffractive element is about 1.30 millimeters and the outer diameter is about 3.36 millimeters.
Claim 13
Dependent Claim
44 words
The lens of claim 8, wherein said diffractive element comprises a circular zone disposed at about the geometric center of the lens and a annular zone having an inner diameter greater than zero and an outer diameter less than the diameter of said lens.
Claim 14
Dependent Claim
36 words
The lens of claim 13, wherein the diameter of said circular zone is about 1.72 millimeters, and the inner diameter of said diffractive element is about 2.90 millimeters and the outer diameter is about 4.60 millimeters.
Claim 15
Dependent Claim
19 words
The lens of claim 1, wherein said diffractive zones have a diffractive power of greater than about 2 diopters.
Claim 16
Dependent Claim
17 words
The lens of claim 1, wherein the optical efficiency of said lens is greater than about 85%.
Claim 17
Dependent Claim
15 words
The lens of claim 16, wherein the optical efficiency of said lens is about 100%.
Claim 18
Dependent Claim
14 words
The lens of claim 1, wherein said diffractive element comprise Fresnel zone plate elements.
Claim 19
Dependent Claim
12 words
The lens of claim 1, wherein said diffractive element comprise holographic elements.
Claim 20
Dependent Claim
129 words
A multifocal lens for correcting vision comprising: a basic lens element having a basic lens power and a basic focal length; one or more first diffractive elements covering one or more zones of said basic lens element and having a first diffractive power; and one or more second diffractive elements covering one or more zones of said basic lens element and having a second diffractive power, whereby a first portion of the light travelling through said lens is focused at a first focal length by the combined power of said basic lens element and said first diffractive elements, and another portion of the light traveling through said lens is focused at a second focal length by the combined power of said basic lens element and said second diffractive elements.
Claim 21
Dependent Claim
12 words
The lens of claim 20, wherein said lens is a contact lens.
Claim 22
Dependent Claim
12 words
The lens of claim 20, wherein said lens is an intraocular lens.
Claim 23
Dependent Claim
13 words
The lens of claim 20, wherein said basic power is provided by refraction.
Claim 24
Dependent Claim
14 words
The lens of claim 23, wherein said basic lens element comprises a biconvex lens.
Claim 25
Dependent Claim
14 words
The lens of claim 23, wherein said basic lens element comprises a meniscus lens.
Claim 26
Dependent Claim
14 words
The lens of claim 23, wherein said basic lens element comprises a piano-convex lens.
Claim 27
Dependent Claim
16 words
The lens of claim 20, wherein said diffractive zones are arrayed in a substantially annular pattern.
Claim 28
Dependent Claim
15 words
The lens of claim 20, wherein said diffractive zones are arranged as alternate semi-circular areas.
Claim 29
Dependent Claim
16 words
The lens of claim 20, wherein said diffractive zones are arrayed as alternating quarter circular areas.
Claim 30
Dependent Claim
31 words
The lens of claim 27, wherein said diffractive element comprises an annular zone having an inner diameter greater than zero and an outer diameter less than the diameter of said lens.
Claim 31
Dependent Claim
44 words
The lens of claim 20, wherein said diffractive element comprises a circular zone disposed at about the geometric center of the lens and a annular zone having an inner diameter greater than zero and an outer diameter less than the diameter of said lens.
Claim 32
Dependent Claim
18 words
The lens of claim 20, wherein said diffractive elements are of an optical efficiency greater than about 85%.
Claim 33
Dependent Claim
17 words
The lens of claim 20, wherein said diffractive elements are of an optical efficiency of about 100%.
References Cited (Backward Citations)
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