US5214453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Progressive eccentricity multifocal contact lens and manufacturing process thereof
Assignee: Individual
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Filing: 1989-05-08
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Granted: 1993-05-25
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Expires: 2009-05-08
Abstract
Abstract A multifocal contact lens, having progressive eccentricity in an area coaxial relative to the optical center, is obtained through the lens outer surface turning on a lathe, in the optical area involved, by means of a computer controlled lathe, based on special computer programs. The contact lens provided as said above allows vision problems concerning both far range vision and near range vision, in miopic or hypermetropic subjects, to be simultaneously corrected.
Inventors
- 👤 Mario Giovanzana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042; G02C7/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A multifocal contact lens for both hard and soft contact lenses with a machined front surface comprising substantially a spherically curved central area and one or more coaxial non-spherical adjacent area or areas, and characterized in that the aspherical curvature of said coaxial adjacent area or areas intrinsically has a progressive eccentricity that changes regularly according to fixed increments in a linear progression derived from the ratio of two end values such that a geometrical pattern is established to change the outer radius of said front surface of said coaxial adjacent area or areas starting from said central area at a progressive rate to obtain a sagittal for vision correction, the progressive variation eccentricity of said coaxial adjacent area or areas ranging between 0.01 and 0.03 per deviation degree of the corresponding radius of curvature.
Claim 2
Dependent Claim
135 words
A multifocal contact lens for both hard and soft contact lenses with a machined front surface comprising substantially a spherically curved central area and one or more coaxial non-spherical adjacent area or areas, and characterized in that the aspherical curvature of said coaxial adjacent area or areas intrinsically has a progressive eccentricity that changes regularly according to fixed increments in a linear progression derived from the ratio of two end values such that a geometrical pattern is established to change the outer radius of said front surface of said coaxial adjacent area or areas starting from said central area at a progressive rate to obtain a sagittal for vision correction, the progressive variation eccentricity of said coaxial adjacent area or areas ranging between 0.01 and 0.03 per deviation degree of the corresponding radius of curvature.
Claim 3
Dependent Claim
35 words
The multifocal lens of claim 1, wherein said central area is designed for far range vision and at least the first or single coaxial non-spherical adjacent area or areas is designed for near range vision.
References Cited (Backward Citations)
US4580882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |