US5493350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multipocal contact lens and method for preparing
Assignee: LIFESTYLE COMPANY Inc
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Filing: 1993-08-25
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Granted: 1996-02-20
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Expires: 2013-08-25
Abstract
Abstract A multifocal contact lens customized for a patient includes a central portion having a concave aspherical posterior surface of a standardized eccentricity and an annular portion connected to the central portion. The central portion also has a convex anterior surface with a power curve customized to the patient. The annular portion is provided with an aspheric annular cornea-fitting posterior surface and has an outer edge with a centralized apex, whereby the annular portion may be formed at the outer edge to be entrainable by a patient's eyelid to shift the lens relative to the patient's eye to vary which portion of the power curve is used during vision. The contact lenses according to the invention may be rigid or soft (hydrogels).
Inventors
- 👤 Leonard Seidner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:52
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00086; G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C2202/00; G02C2202/04
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
88 words
A multifocal contact lens customized for a patient, comprising: an annular portion with an aspheric annular cornea-fitting posterior surface having a standardized eccentricity; an edge bevel at an annular periphery of said annular portion; a central portion connected to said annular portion, said central portion having a concave aspherical posterior surface of a standardized eccentricity, said central portion also having a convex anterior surface with an aspheric power curve customized to the patient; and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface.
Claim 2
Dependent Claim
88 words
A multifocal contact lens customized for a patient, comprising: an annular portion with an aspheric annular cornea-fitting posterior surface having a standardized eccentricity; an edge bevel at an annular periphery of said annular portion; a central portion connected to said annular portion, said central portion having a concave aspherical posterior surface of a standardized eccentricity, said central portion also having a convex anterior surface with an aspheric power curve customized to the patient; and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface.
Claim 3
Dependent Claim
38 words
The lens defined in claim 1 wherein said concave aspherical posterior surface has an eccentricity between about 0.6 and about 1.5 and wherein said aspheric annular cornea-fitting posterior surface has an eccentricity between about 0.4 and about 0.8.
Claim 4
Dependent Claim
27 words
The lens defined in claim 2 wherein said concave aspherical posterior surface and said aspheric annular cornea-fitting posterior surface have the same eccentricity and radius of curvature.
Claim 5
Dependent Claim
29 words
The lens defined in claim 1 wherein said aspheric annular cornea-fitting posterior surface is flat relative to the wearer's cornea, whereby the lens translates relatively easily on the cornea.
Claim 6
Dependent Claim
36 words
The lens defined in claim 1 wherein said aspheric annular cornea-fitting posterior surface is generated by a larger radius of curvature than said concave aspherical posterior surface, whereby the lens translates relatively easily on the cornea.
Claim 7
Dependent Claim
45 words
The lens defined in claim 1 wherein the lens has an outer edge formed so as to be effectively entrainable by a patient's eyelid to shift the lens relative to the patient's eye to vary which portion of said power curve is used during vision.
Claim 8
Dependent Claim
17 words
The lens defined in claim 6 wherein the lens has an outer edge with a centralized apex.
Claim 9
Dependent Claim
18 words
The lens defined in claim 1 wherein said transition surface has a gradual or minor change in curvature.
Claim 10
Dependent Claim
19 words
The lens defined in claim 1, further comprising a blend curve between said annular portion and said edge bevel.
Claim 11
Dependent Claim
106 words
A multifocal contact lens customized for a patient, comprising: an annular portion with an aspheric annular cornea-fitting posterior surface having a standardized eccentricity; an edge bevel at an annular periphery of said annular portion; a central portion connected to said annular portion, said central portion having a concave aspherical posterior surface of a standardized eccentricity, said central portion also having a convex anterior surface with a central power curve and a lenticular power curve of different powers both customized to the patient; and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface, said transition surface having a gradual change in curvature.
Claim 12
Dependent Claim
106 words
A multifocal contact lens customized for a patient, comprising: an annular portion with an aspheric annular cornea-fitting posterior surface having a standardized eccentricity; an edge bevel at an annular periphery of said annular portion; a central portion connected to said annular portion, said central portion having a concave aspherical posterior surface of a standardized eccentricity, said central portion also having a convex anterior surface with a central power curve and a lenticular power curve of different powers both customized to the patient; and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface, said transition surface having a gradual change in curvature.
Claim 13
Dependent Claim
38 words
The lens defined in claim 10 wherein said concave aspherical posterior surface has an eccentricity between about 0.6 and about 1.5 and wherein said aspheric annular cornea-fitting posterior surface has an eccentricity between about 0.4 and about 0.8.
Claim 14
Dependent Claim
27 words
The lens defined in claim 11 wherein said concave aspherical posterior surface and said aspheric annular cornea-fitting posterior surface have the same eccentricity and radius of curvature.
Claim 15
Dependent Claim
27 words
The lens defined in claim 10 wherein said aspheric annular cornea-fitting posterior surface is flat relative to the wearer's cornea, whereby the lens translates on the cornea.
Claim 16
Dependent Claim
46 words
The lens defined in claim 10 wherein said annular portion has an outer edge formed so as to be effectively entrainable by a patient's eyelid to shift the lens relative to the patient's eye to vary which portion of said power curve is used during vision.
Claim 17
Dependent Claim
18 words
The lens defined in claim 14 wherein said annular portion has an outer edge with a centralized apex.
Claim 18
Independent Claim
202 words
A method for use in preparing a customized multifocal contact lens, comprising the steps of: providing a standard diagnostic contact lens having an annular portion with a concave cornea-fitting posterior surface, said diagnostic contact lens also having a central portion with a predetermined convex anterior surface and a concave aspherical posterior surface of predetermined eccentricity; placing said diagnostic contact lens on the cornea of a patient's eye so that said fitting surface is in substantial contact with the cornea; allowing said diagnostic contact lens to align itself with the cornea in an off-center position while the patient looks at an effectively distant object; upon aligning of said diagnostic contact lens in said off-center position, disposing a series of test lenses before the patient's eye to determine a first portion of a power curve with which said anterior surface of said central portion could be formed to provide optimal far vision for the patient; and while the patient looks at an effectively near object, disposing another series of test lenses before the patient's eye to determine whether said anterior surface of said central portion should be formed with a second portion of a power curve to provide optimal near vision for the patient.
Claim 19
Independent Claim
202 words
A method for use in preparing a customized multifocal contact lens, comprising the steps of: providing a standard diagnostic contact lens having an annular portion with a concave cornea-fitting posterior surface, said diagnostic contact lens also having a central portion with a predetermined convex anterior surface and a concave aspherical posterior surface of predetermined eccentricity; placing said diagnostic contact lens on the cornea of a patient's eye so that said fitting surface is in substantial contact with the cornea; allowing said diagnostic contact lens to align itself with the cornea in an off-center position while the patient looks at an effectively distant object; upon aligning of said diagnostic contact lens in said off-center position, disposing a series of test lenses before the patient's eye to determine a first portion of a power curve with which said anterior surface of said central portion could be formed to provide optimal far vision for the patient; and while the patient looks at an effectively near object, disposing another series of test lenses before the patient's eye to determine whether said anterior surface of said central portion should be formed with a second portion of a power curve to provide optimal near vision for the patient.
Claim 20
Dependent Claim
74 words
The method defined in claim 16 wherein said step of providing a standard diagnostic contact lens includes the steps of: providing a plurality of standard diagnostic contact lenses each having an annular portion with a concave cornea-fitting posterior surface, said diagnostic contact lenses each having a central portion with a predetermined convex anterior surface and a concave aspherical posterior surface of a respective predetermined eccentricity; and selecting one of said standard diagnostic contact lenses.
Claim 21
Dependent Claim
24 words
The method defined in claim 17 wherein the concave cornea-fitting posterior surface of each of said plurality of standard diagnostic contact lenses is aspherical.
Claim 22
Dependent Claim
24 words
The method defined in claim 18 wherein the concave cornea-fitting posterior surfaces of said standard contact lenses have an eccentricity greater than about 0.4.
Claim 23
Dependent Claim
97 words
A multifocal contact lens customized for a patient, comprising: an annular portion with an aspheric annular cornea-fitting posterior surface having a standardized eccentricity between about 0.4 and about 0.8; an edge bevel at an annular periphery of said annular portion; a central portion connected to said annular portion, said central portion having a concave aspherical posterior surface of a standardized eccentricity between 0.6 and 1.50, said central portion also having a convex anterior surface with a power curve customized to the patient; and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface.
Claim 24
Dependent Claim
97 words
A multifocal contact lens customized for a patient, comprising: an annular portion with an aspheric annular cornea-fitting posterior surface having a standardized eccentricity between about 0.4 and about 0.8; an edge bevel at an annular periphery of said annular portion; a central portion connected to said annular portion, said central portion having a concave aspherical posterior surface of a standardized eccentricity between 0.6 and 1.50, said central portion also having a convex anterior surface with a power curve customized to the patient; and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface.
Claim 25
Dependent Claim
18 words
The lens defined in claim 20 wherein said convex anterior surface is formed with an aspheric power curve.
Claim 26
Dependent Claim
18 words
The lens defined in claim 20 wherein said transition surface has a gradual or minor change in curvature.
Claim 27
Dependent Claim
19 words
The lens defined in claim 20, further comprising a blend curve between said annular portion and said edge bevel.
Claim 28
Dependent Claim
99 words
A multifocal contact lens customized for a patient, comprising: a central portion having a concave aspherical posterior surface of a standardized eccentricity, said central portion also having a convex anterior surface with a power curve customized to the patient; and an annular portion connected to said central portion, said annular portion being provided with an aspheric annular cornea-fitting posterior surface, said annular portion having an outer edge formed so as to be effectively entrainable by a patient's eyelid to shift the lens relative to the patient's eye to vary which portion of said power curve is used during vision.
Claim 29
Dependent Claim
99 words
A multifocal contact lens customized for a patient, comprising: a central portion having a concave aspherical posterior surface of a standardized eccentricity, said central portion also having a convex anterior surface with a power curve customized to the patient; and an annular portion connected to said central portion, said annular portion being provided with an aspheric annular cornea-fitting posterior surface, said annular portion having an outer edge formed so as to be effectively entrainable by a patient's eyelid to shift the lens relative to the patient's eye to vary which portion of said power curve is used during vision.
Claim 30
Dependent Claim
52 words
A multifocal contact lens customized for a patient, having an annular cornea fitting posterior surface and a concave aspheric posterior surface with a standardized eccentricity, a convex anterior surface with a power curve customized to the patient, and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface.
Claim 31
Dependent Claim
52 words
A multifocal contact lens customized for a patient, having an annular cornea fitting posterior surface and a concave aspheric posterior surface with a standardized eccentricity, a convex anterior surface with a power curve customized to the patient, and a transition surface connecting said cornea-fitting posterior surface and said concave aspherical posterior surface.
Claim 32
Dependent Claim
12 words
The lens defined in claim 25 wherein said power curve is aspheric.
Claim 33
Dependent Claim
17 words
The lens defined in claim 26 wherein said power curve has an eccentricity between 0 and 0.6.
Claim 34
Dependent Claim
40 words
The lens defined in claim 25 wherein said convex anterior surface has a central zone with said power curve, said anterior surface having a lenticular area with an additional power curve different from the power curve of said central zone.
Claim 35
Dependent Claim
18 words
The lens defined in claim 25 wherein said transition surface has a gradual or minor change in curvature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |