Apodized diffractive IOL with frustrated diffractive region
First Claim
1. An ophthalmic lens, comprisingan 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 so as to provide a near focus, wherein each zone is separated from an adjacent zone by a zone boundary imparting an optical phase delay to incident light,wherein at least two consecutive zone boundaries are configured such that a difference between their associated phase delays for at least one wavelength is greater than about 1/20 wavelength so as to direct a portion of the incident light to a location between said near and far foci.
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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 1/4 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
36 Claims
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1. 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 so as to provide a near focus, wherein each zone is separated from an adjacent zone by a zone boundary imparting an optical phase delay to incident light, wherein at least two consecutive zone boundaries are configured such that a difference between their associated phase delays for at least one wavelength is greater than about 1/20 wavelength so as to direct a portion of the incident light to a location between said near and far foci.
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14. 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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19. An ophthalmic lens, comprising
an optic having an anterior surface and a posterior surface, said optic providing a far-focus optical power, 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.
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25. 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.
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30. 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+2λ
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 (31, 32, 33)
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34. 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 A denotes a design wavelength and 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 (35, 36)
- {square root over (λ
Specification