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US 5,002,382 AGranted
Multifocal corneal contact lenses
OwnerLeonard Seidnerinventor
Life of this patent
Estimating the term…
Abstract
In multifocal corneal contact lenses, the lenses of each pair have a different geometric configuration and/or distribution of focal zones. The zones are distributed to provide vision corrections of different kinds for the two eyes of a patient under different illumination conditions.
Claims28
A pair of multifocal corneal contact lenses, comprising:
- a first contact lens for one eye of a patient, said lens having a first distant vision correction zone and a first near vision correction zone;
- and
- a second contact lens for the other eye of the patient, said second contact lens having a first correction zone and a second correction zone, said first correction zone corresponding at least generally in shape and location to said distant vision correction zone of said first contact lens, said second correction zone corresponding at least generally in shape and location to said near vision correction zone of said first contact lens, said first correction zone constituting a second near vision correction zone and said second correction zone constituting a second distant vision correction zone, at least one of said first contact lens and said second contact lens having an intermediate distance correction zone separating the distant vision correction zone from the respective near vision correction zone of said one of said first contact lens and said second contact lens.
A pair of multifocal corneal contact lenses, comprising:
- a first contact lens for one eye of a patient, said lens having a distant vision correction zone, a near vision correction zone and an intermediate distance correction zone;
- and
- a second contact lens for the other eye of the patient, said second contact lens having a first correction zone, a second correction zone and a third correction zone, said first correction zone corresponding generally in shape and location to said distant vision correction zone of said first contact lens, said second correction zone corresponding generally in shape and location to said near vision correction zone of said first contact lens, said third correction zone corresponding generally in shape and location to said intermediate distance correction zone of said first contact lens, one of said first correction zone, said second correction zone and said third correction zone having a focal length lying in the same focal range as the focal length of the corresponding zone of said first contact lens, the other two of said first correction zone, said second correction zone and said third correction zone each having a focal length lying in the same focal range as the one of the remaining two zones of said first contact lens having a size and location therein different from the size and location of the respective correction zone in said second contact lens, whereby said other two of said first correction zone, said second correction zone and said third correction zone are switched in location with respect to said first contact lens.
A pair of multifocal corneal contact lenses, comprising:
- a first contact lens for one eye of a patient, said lens having a first correction zone and a second correction zone concentrically disposed with respect to one another, said first correction zone being circular and said second correction zone being annular in plan view of said first contact lens, said first correction zone constituting a distant vision correction zone and said second correction zone constituting a near vision correction zone;
- and
- a second contact lens for the other eye of the patient, said second contact lens having a third correction zone and a fourth correction zone concentrically disposed with respect to one another, said third correction zone being circular and said fourth correction zone being annular in plan view of said second contact lens, said third correction zone constituting a near vision correction zone and said fourth correction zone constituting a distant vision correction zone,
- wherein said first correction zone and said third correction zone each have an area equal to at least approximately two-thirds of a minimum area subtended by the respective pupil of the patient.
1 more element
A pair of multifocal corneal contact lenses, comprising:
- a first contact lens for one eye of a patient, said lens having a circular first correction zone, an annular second correction zone disposed concentrically around said first correction zone and an annular third correction zone concentrically disposed around said second correction zone, one of said first correction zone, said second correction zone and said third correction zone constituting a distant vision correction zone, another of said first correction zone, said second correction zone and said third correction zone constituting a near vision correction zone, and yet another of said first correction zone, said second correction zone and said third correction zone constituting an intermediate distance correction zone;
- and
- a second contact lens for the other eye of the patient, said second contact lens having a fourth correction zone and a fifth correction zone, one of said fourth correction zone and said fifth correction zone constituting a distant vision correction zone and the other of said fourth correction zone and said fifth correction zone constituting a near vision correction zone, at least one of said fourth correction zone and said fifth correction zone having a D-shape in plan view of said second contact lens.
A multifocal corneal contact lens comprising a circular first correction zone, a second correction zone disposed on one side of said first correction zone and a third correction zone disposed on a side of said first correction zone opposite said second zone, said second correction zone and said third correction zone being separated at a substantial center of the contact lens by said first correction zone and being adjacent one another along a substantially diametrically extending line on opposite sides of said first correction zone, one of the three zones being a distant vision correction zone, another of the three zones being a near vision correction zone and a remaining one of the three zones being an intermediate distant correction zone.
A pair of multifocal corneal contact lenses, comprising:
- a first contact lens for one eye of a patient, said lens having a first correction zone and second correction zone, said first correction zone having a focal length in a first focal range and said second correction zone having a focal length in a second focal range;
- and
- a second contact lens for the other eye of the patient, said second contact lens having a third correction zone and a fourth correction zone, said third correction zone corresponding generally in size shape and location to said first correction zone, said fourth correction zone corresponding generally in shape and location to said second correction zone, said third correction zone having a focal length in said second focal range and said fourth correction zone having a focal length in said first focal range, at least one of said first contact lens and said second contact lens having on an anterior side a continuous surface with essentially a single radius of curvature, said one of said first contact lens and said second contact lens being provided on a posterior side with a cornea matching surface extending annularly along a periphery of said lens, said posterior side being further formed with at least one concave surface having a radius of curvature smaller than any radius of curvature of said cornea matching surface, said concave surface being radially spaced from a geometric center of said lens.
A pair of multifocal corneal contact lenses, comprising:
- a first contact lens for one eye of a patient, said lens having a first correction zone and second correction zone, said first correction zone having a focal length in a first focal range and said second correction zone having a focal length in a second focal range;
- and
- a second contact lens for the other eye of the patient, said second contact lens having a third correction zone and a fourth correction zone, said third correction zone and said fourth correction zone each having a geometric configuration different from said first correction zone and said second correction zone, said third correction zone having a focal length in a third focal range and said fourth correction zone having a focal length in a fourth focal range different from said third focal range, at least one of said first contact lens and said second contact lens having on an anterior side a continuous surface with essentially a single radius of curvature, said one of said first contact lens and said second contact lens being provided on a posterior side with a cornea matching surface extending annularly along a periphery of said lens, said posterior side being further formed with at least one concave surface having a radius of curvature smaller than any radius of curvature of said cornea matching surface, said concave surface being spaced from a geometric center of said lens.
Dependencies are inferred from the claim text.