US5526071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifocal contact lens and method for preparing
Assignee: Permeable Technologies Inc
•
Filing: 1994-02-25
•
Granted: 1996-06-11
•
Expires: 2014-02-25
Abstract
Abstract A hydrophilic multifocal contact lens customized for a patient comprises, in accordance with the present invention, (i) an anterior surface having at least two annular aspheric surfaces, each of said annular aspheric surfaces having standard eccentricity values ranging from about 0.4 to about 1.8, said surfaces differing in eccentricity value from about 0.2 to about 0.8, (ii) a concave posterior cornea-fitting surface having at least one spherical or aspheric surface, and optionally, (iii) an edge radius at the annular periphery of said posterior surface.
Inventors
- 👤 Leonard Seidner
- 👤 Maurice Poster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:53
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00086; G02C7/042; G02C7/043
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
42 words
A multifocal contact lens customized for a patient, having an anterior side with a power curve defined by at least two substantial concentric or coaxial aspheric surfaces each having a single essentially uniform standard eccentricity value between about 0.4 and about 1.8.
Claim 2
Dependent Claim
42 words
A multifocal contact lens customized for a patient, having an anterior side with a power curve defined by at least two substantial concentric or coaxial aspheric surfaces each having a single essentially uniform standard eccentricity value between about 0.4 and about 1.8.
Claim 3
Dependent Claim
30 words
The lens defined in claim 1 wherein the eccentricity values of said aspheric surfaces differ from one another by at least approximately 0.2 and by no more than approximately 0.8.
Claim 4
Dependent Claim
24 words
The lens defined in claim 1 wherein the eccentricity values of said aspheric surfaces differ from one another by no more than approximately 0.8.
Claim 5
Dependent Claim
37 words
The lens defined in claim 3 wherein said aspheric surfaces include a central aspheric surface having a first eccentricity and an annular aspheric surface having a second eccentricity, said first eccentricity being less than said second eccentricity.
Claim 6
Dependent Claim
13 words
The lens defined in claim 1, further comprising an aspheric cornea-fitting posterior surface.
Claim 7
Dependent Claim
21 words
The lens defined in claim 5 wherein said posterior surface has an eccentricity value ranging from about 0.3 to about 1.0.
Claim 8
Dependent Claim
29 words
The lens defined in claim 1 wherein said anterior side has three concentric or coaxial aspheric surfaces each having a standard eccentricity value between about 0.4 and about 1.8.
Claim 9
Dependent Claim
30 words
The lens defined in claim 7 wherein the eccentricity values of said aspheric surfaces differ from one another by at least approximately 0.2 and by no more than approximately 0.8.
Claim 10
Dependent Claim
48 words
The lens defined in claim 1 wherein said aspheric surfaces include a central aspheric surface having a first eccentricity, a first annular aspheric surface having a second eccentricity greater than said first eccentricity, and a second annular aspheric surface having a third eccentricity greater than said second eccentricity.
Claim 11
Dependent Claim
11 words
The lens defined in claim 1 manufactured from a hydrophilic polymer.
Claim 12
Dependent Claim
37 words
The lens defined in claim 1 wherein said aspheric surfaces include a central aspheric surface having a first eccentricity and an annular aspheric surface having a second eccentricity, said first eccentricity being less than said second eccentricity.
Claim 13
Independent Claim
233 words
A method for use in preparing a customized multifocal contact lens, comprising the steps of: providing a standard diagnostic contact lens having a concave cornea-fitting posterior surface, said diagnostic contact lens also having a convex anterior surface with a first test area of a predetermined refractive power and a second test area of a predetermined refractive power, said second test area being concentric or coaxial with respect to said first test area; placing said diagnostic contact lens on the cornea of a patient's eye so that said posterior surface is in substantial contact with the cornea; allowing said diagnostic contact lens to align itself with the cornea in a natural position; upon aligning of said diagnostic contact lens in said natural position, disposing a series of test lenses before the patient's eye to determine a first aspheric power curve having a single first substantially uniform standard eccentricity value with which said first area 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 a second aspheric power curve having a single second substantially uniform standard eccentricity value with which said second area could be formed to provide optimal near vision for the patient, said second substantially uniform standard eccentricity value being different from said first substantially uniform standard eccentricity value.
Claim 14
Independent Claim
233 words
A method for use in preparing a customized multifocal contact lens, comprising the steps of: providing a standard diagnostic contact lens having a concave cornea-fitting posterior surface, said diagnostic contact lens also having a convex anterior surface with a first test area of a predetermined refractive power and a second test area of a predetermined refractive power, said second test area being concentric or coaxial with respect to said first test area; placing said diagnostic contact lens on the cornea of a patient's eye so that said posterior surface is in substantial contact with the cornea; allowing said diagnostic contact lens to align itself with the cornea in a natural position; upon aligning of said diagnostic contact lens in said natural position, disposing a series of test lenses before the patient's eye to determine a first aspheric power curve having a single first substantially uniform standard eccentricity value with which said first area 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 a second aspheric power curve having a single second substantially uniform standard eccentricity value with which said second area could be formed to provide optimal near vision for the patient, said second substantially uniform standard eccentricity value being different from said first substantially uniform standard eccentricity value.
Claim 15
Dependent Claim
38 words
The method defined in claim 12 wherein said steps of disposing include the steps of determining said first aspheric power curve and said second aspheric power curve to have eccentricity values each between about 0.4 and about 1.8.
Claim 16
Dependent Claim
51 words
The method defined in claim 13 wherein said steps of disposing include the steps of determining the eccentricity values of said first aspheric curve and said second aspheric power curve so that those eccentricity values differ from one another by at least approximately 0.2 and by no more than approximately 0.8.
Claim 17
Dependent Claim
58 words
The method defined in claim 14 wherein said first area is a central surface and said second area is an annular area coaxial or concentric with said first area, said steps of disposing include the step of determining the eccentricity of said first aspheric power curve to be less than the eccentricity of said second aspheric power curve.
Claim 18
Dependent Claim
12 words
The method defined in claim 12 wherein said posterior surface is aspheric.
Claim 19
Dependent Claim
21 words
The method defined in claim 16 wherein said posterior surface has an eccentricity value ranging from about 0.3 to about 1.0.
Claim 20
Dependent Claim
20 words
The method defined in claim 12 wherein said second predetermined refractive power is different from said first predetermined refractive power.
Claim 21
Dependent Claim
37 words
The method defined in claim 12 wherein said aspheric surfaces include a central aspheric surface having a first eccentricity and an annular aspheric surface having a second eccentricity, said first eccentricity being less than said second eccentricity.
Claim 22
Dependent Claim
89 words
The method defined in claim 12 wherein said step of providing a standard diagnostic contact lens includes the steps of: providing a plurality of standard diagnostic contact lenses each having a concave cornea-fitting posterior surface, said diagnostic contact lenses each having a convex anterior surface with a first test area of a predetermined refractive power and a second test area of a predetermined refractive power, said second test area being concentric or coaxial with respect to said first test area; and selecting one of said standard diagnostic contact lenses.
Claim 23
Dependent Claim
67 words
A multifocal contact lens customized for a patient, having an anterior side with a power curve defined by at least a substantial first aspheric surface having a single first substantially uniform standard eccentricity value and a substantial second aspheric surface concentric or coaxial with said first aspheric surface and having a single second substantially uniform standard eccentricity value different from said first substantially uniform standard eccentricity value.
Claim 24
Dependent Claim
67 words
A multifocal contact lens customized for a patient, having an anterior side with a power curve defined by at least a substantial first aspheric surface having a single first substantially uniform standard eccentricity value and a substantial second aspheric surface concentric or coaxial with said first aspheric surface and having a single second substantially uniform standard eccentricity value different from said first substantially uniform standard eccentricity value.
Claim 25
Dependent Claim
38 words
The lens defined in claim 21 wherein said first substantially uniform standard eccentricity value and said second substantially uniform standard eccentricity value differ from one another by at least approximately 0.2 and by no more than approximately 0.8.
Claim 26
Dependent Claim
24 words
The lens defined in claim 22 wherein said first substantially uniform standard eccentricity value is less than said second substantially uniform standard eccentricity value.
Claim 27
Dependent Claim
13 words
The lens defined in claim 21, further comprising an aspheric cornea-fitting posterior surface.
References Cited (Backward Citations)
US3482906A
Cited
US4525043A
Cited
US4418991A
Cited
US4636049A
Cited
US4640595A
Cited
US4883350A
Cited
US4752123A
Cited
US4765728A
Cited
US4890912A
Cited
US4936672A
Cited
US4971432A
Cited
US5181053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-11 | 1999-12-11 | 2000-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-11 | 2003-12-11 | 2004-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-11 | 2007-12-11 | 2008-06-11 | $7700.00 | Window Closed / Lapsed |