Back to results
US 5,691,797 AGranted
Multifocal contact lens
AssigneePermeable Technologies, Inc.
InventorsLeonard Seidner, Maurice Poster
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneePermeable Technologies, Inc.
InventorsLeonard Seidner, Maurice Poster
Estimating the term…
A multifocal contact lens customized for a patient has an anterior side with a power curve defined in part by (i) a central spheric aspheric surface, (ii) an inner annular spheric surface contiguous with the central aspheric surface, (iii) a second annular spheric surface contiguous along a radially inner periphery with the inner annular spheric surface, and (iv) an outer annular spheric surface contiguous along a radially inner periphery with the second annular spheric surface. Each of the annular spheric surfaces is concentric or coaxial with the central aspheric surface. The central aspheric surface corresponds to a distance vision correction zone. The inner annular spheric surface is an spheric surface corresponding to an intermediate vision correction zone. The second annular spheric surface corresponds to a near vision correction zone, and the outer annular spheric surface corresponds to a distant vision correction zone.
A multifocal contact lens customized for a patient, having an anterior side with a power curve defined in part by (i) an aspheric central surface having a negative eccentricity with a magnitude between approximately 0.6 and approximately 1.0, (ii) an inner annular surface contiguous with said central surface, (iii) a second annular surface contiguous along a radially inner periphery with said inner annular surface, and (iv) an outer annular surface contiguous along a radially inner periphery with said second annular surface, each of the annular surfaces being concentric or coaxial with said central surface, said central surface corresponding to a distance vision correction zone, said inner annular surface corresponding to an intermediate vision correction zone, said second annular surface corresponding to a near vision correction zone, and said outer annular surface corresponding to a distant vision correction zone.
A multifocal contact lens customized for a patient, having an anterior side with a power curve defined in part by (i) an aspheric central surface having a negative eccentricity with a magnitude between approximately 0.6 and approximately 1.0, (ii) an inner annular surface contiguous with said central surface, (iii) a second annular surface contiguous along a radially inner periphery with said inner annular surface, and (iv) an outer annular surface contiguous along a radially inner periphery with said second annular surface, each of the annular surfaces being concentric or coaxial with said central surface, said inner annular surface corresponding to an intermediate vision correction zone.
Dependencies are inferred from the claim text.