Apodized diffractive IOL with frustrated diffractive region
First Claim
1. An ophthalmic lens, comprisingan optic having an anterior surface and a posterior surface,a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces, each zone being separated from an adjacent zone by a zone boundary,said optic providing a far focus corresponding to a zeroth diffraction order of said diffractive zones and a near focus corresponding to a 1st diffraction order of said diffractive zones,wherein said zone boundaries are characterized by a plurality of non-uniform step heights generating non-uniform phase delays adapted to direct a portion of incident light to a location between said near and far foci so as to enhance intermediate vision.
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Accused Products
Abstract
In one aspect, the present invention provides a diffractive ophthalmic lens (e.g., a diffractive IOL) that includes an optic having an anterior surface and a posterior surface, where the optic provides a far focus. A frustrated diffractive structure comprising a plurality of diffractive zones is disposed on at least one of those surfaces so as to provide a near focus. Each zone is separated from an adjacent zone by a zone boundary that imparts an optical delay to the incident light. Further, at least two consecutive zone boundaries are configured such that a difference between their associated phase delays for at least one wavelength of the incident light is greater than about ¼ wavelength so as to direct a portion of the incident light to a location between the near and far foci.
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Citations
19 Claims
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1. An ophthalmic lens, comprising
an optic having an anterior surface and a posterior surface, a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces, each zone being separated from an adjacent zone by a zone boundary, said optic providing a far focus corresponding to a zeroth diffraction order of said diffractive zones and a near focus corresponding to a 1st diffraction order of said diffractive zones, wherein said zone boundaries are characterized by a plurality of non-uniform step heights generating non-uniform phase delays adapted to direct a portion of incident light to a location between said near and far foci so as to enhance intermediate vision.
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6. An ophthalmic lens, comprising
an optic having an anterior surface and a posterior surface, said optic providing a far-focus optical power; - and
a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces for providing a near-focus optical power, wherein at least two of said diffractive zones exhibit sufficiently different surface curvatures so as to cause a portion of light incident on said optic to be directed to an intermediate location between said near and far foci for enhancing intermediate vision and wherein a difference in the curvatures of said at least two diffractive zones is in a range of about 10% to about 50%.
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7. An ophthalmic lens, comprising:
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an optic having an anterior surface and a posterior surface, said optic providing a far-focus optical power; and a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces for providing a near-focus optical power, wherein; at least two of said diffractive zones exhibit sufficiently different surface curvatures so as to cause a portion of light incident on said optic to be directed to an intermediate location between said near and far foci for enhancing intermediate vision; a difference in the curvatures of said at least two diffractive zones is in a range of about 10% to about 50%; and said at least two diffractive zones comprise two adjacent zones.
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8. An ophthalmic lens, comprising
an optic having an anterior surface and a posterior surface, said optic providing a far-focus optical power; - and
a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces for providing a near-focus optical power, wherein at least two of said diffractive zones exhibit sufficiently different surface curvatures so as to cause a portion of light incident on said optic to be directed to an intermediate location between said near and far foci for enhancing intermediate vision, and wherein said near-focus optical power corresponds to an add power in a range of about 2 D to about 4 D.
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9. An ophthalmic lens, comprising
an optic having an anterior surface and a posterior surface, said optic providing a far focus, a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces for providing a near focus, wherein a surface of at least one of said diffractive zones exhibits an asphericity such that said diffractive structure directs at least a portion of incident light to an intermediate location between said near and far foci, wherein said asphericity is characterized by a conic constant in a range of about − - 10 to about −
1000. - View Dependent Claims (10)
- 10 to about −
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11. An ophthalmic lens, comprising
an optic having an anterior surface and a posterior surface, said optic providing a far focus, a diffractive structure comprising a plurality of diffractive zones disposed on at least one of said surfaces for providing a near focus, wherein said near focus is characterized by an add power in a range of about 2 D to about 4 D, wherein a surface of at least one of said diffractive zones exhibits an asphericity such that said diffractive structure directs at least a portion of incident light to an intermediate location between said near and far foci.
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13. An ophthalmic lens, comprising
an optic having an anterior optical surface and a posterior optical surface, said optic providing a far focus, a plurality of annular diffractive zones disposed on one of said surfaces about an optical axis of said optic so as to provide a near focus, wherein at least one of said zones (i) has a boundary with a radial location defined by the following relation: -
ri2=r02+2iλ
fwherein i denotes the zone number (i=0 denotes the central zone), λ
denotes a design wavelength,f denotes a focal length of the near focus, and r0 denotes the radius of the central zone, and wherein at least another zone has a boundary with a radial location that differs sufficiently from that defined by the above relation for a putative respective zone so as to direct a portion of incident light to an intermediate location between said far and near foci. - View Dependent Claims (14, 15, 16)
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17. An ophthalmic lens, comprising
an optic having an anterior optical surface and a posterior optical surface, said optic providing a far focus, a plurality of diffractive zones disposed on at least one of said surfaces to provide a near focus, wherein said zones comprise a central zone having a radius that is sufficiently different from √ - {square root over (λ
f)}, where λ
denotes a design wavelength and f denotes a focal length of the near focus, such that at least a portion of incident light is directed to an intermediate location between said near and far foci. - View Dependent Claims (18, 19)
- {square root over (λ
Specification