US4601556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal contact lens for the eye of a patient with keratoconus disease and method of making the same
Assignee: Individual
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Filing: 1983-10-26
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Granted: 1986-07-22
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Expires: 2003-10-26
Abstract
Abstract A contact lens for the eye of a patient with a keratoconus diseased cornea has a posterior surface comprised of three zones, each having a different radius of curvature. The innermost or first zone has a diameter slightly greater than the diameter of the diseased area of the cornea and has a radius of curvature which generally corresponds to but is slightly greater than the outward protrusion of the diseased cornea area. The second zone is generally annular and extends radially beyond the first zone. The second zone has a radius of curvature which is flatter than that of the first zone. The third zone, which is generally annular and extends radially beyond the second zone, has a radius of curvature which is flatter than that of the second zone. A fourth, generally annular, peripheral zone extending beyond the radial outer edge of the third zone may also be provided. The fourth zone includes an outwardly extending edge to facilitate the circulation of oxygen between the lens and the cornea.
Inventors
- 👤 Nick C. Siviglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:27
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/047
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A corneal contact lens for the eye of a patient with a keratoconus diseased cornea, the lens having a posterior surface comprised of: a first generally circular vaulting zone having a diameter slightly greater than the diameter of the diseased area of the cornea and having a radius of outward curvature generally corresponding to but slightly greater than the outward protrusion of the diseased area, the first zone being generally centered upon, generally parallel to and spaced from the diseased area of the cornea; a second generally annular transition zone extending radially beyond the first zone, the second zone having a radius of curvature flatter than that of the first zone; and a third generally annular bearing zone extending radially beyond the second zone, the third zone having a radius of curvature flatter than that of the second zone.
Claim 2
Dependent Claim
139 words
A corneal contact lens for the eye of a patient with a keratoconus diseased cornea, the lens having a posterior surface comprised of: a first generally circular vaulting zone having a diameter slightly greater than the diameter of the diseased area of the cornea and having a radius of outward curvature generally corresponding to but slightly greater than the outward protrusion of the diseased area, the first zone being generally centered upon, generally parallel to and spaced from the diseased area of the cornea; a second generally annular transition zone extending radially beyond the first zone, the second zone having a radius of curvature flatter than that of the first zone; and a third generally annular bearing zone extending radially beyond the second zone, the third zone having a radius of curvature flatter than that of the second zone.
Claim 3
Dependent Claim
52 words
The lens as recited in claim 1 and further including a generally annular fourth, peripheral zone extending about 0.03 millimeters beyond the third zone to the periphery of the lens, the fourth zone comprising an outwardly extending edge of the lens to facilitate circulation of oxygen between the lens and the cornea.
Claim 4
Dependent Claim
21 words
The lens as recited in claim 1 wherein the second zone extends 0.05 to 0.07 millimeters radially beyond the first zone.
Claim 5
Dependent Claim
30 words
The lens as recited in claim 3 wherein the radius of curvature of the second zone is about 1.25 diopters flatter than the radius of curvature of the first zone.
Claim 6
Dependent Claim
30 words
The lens as recited in claim 4 wherein the radius of curvature of the third zone is about 2.0 diopters flatter than the radius of curvature of the second zone.
Claim 7
Independent Claim
199 words
A method of making a corneal contact lens for the eye of a patient with keratoconus disease comprising the steps of: establishing the position, size and topography of the diseased area of the cornea; fabricating a contact lens having an anterior surface and a posterior surface, the posterior surface comprising a first generally circular vaulting zone having a diameter slightly greater than the diameter of the diseased area of the cornea and having a radius of outward curvature generally corresponding to but slightly greater than the outward protrusion of the diseased area so that when the lens is in place on the patient's eye the first zone is generally centered upon, generally parallel to and spaced from the diseased area of the cornea, a second generally annular transition zone extending radially beyond the first zone, the second zone having a radius of curvature flatter than that of the first zone, and a third generally annular bearing zone extending radially beyond the second zone, the third zone having a radius of curvature flatter than that of the second zone; refracting the patient to determine the prescription required; and fabricating the anterior surface of the lens in accordance with the prescription.
Claim 8
Independent Claim
199 words
A method of making a corneal contact lens for the eye of a patient with keratoconus disease comprising the steps of: establishing the position, size and topography of the diseased area of the cornea; fabricating a contact lens having an anterior surface and a posterior surface, the posterior surface comprising a first generally circular vaulting zone having a diameter slightly greater than the diameter of the diseased area of the cornea and having a radius of outward curvature generally corresponding to but slightly greater than the outward protrusion of the diseased area so that when the lens is in place on the patient's eye the first zone is generally centered upon, generally parallel to and spaced from the diseased area of the cornea, a second generally annular transition zone extending radially beyond the first zone, the second zone having a radius of curvature flatter than that of the first zone, and a third generally annular bearing zone extending radially beyond the second zone, the third zone having a radius of curvature flatter than that of the second zone; refracting the patient to determine the prescription required; and fabricating the anterior surface of the lens in accordance with the prescription.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |