Ophthalmic lens with multiple phase plates
First Claim
1. An ophthalmic lens, comprising:
- an optic having an anterior surface, a posterior surface, a first base curvature, and an optical axis;
a multifocal phase plate configured to direct light to a first focus and a second focus, the multifocal phase plate comprising a first plurality of echelettes centered about a first base curvature in a direction that is parallel to the optical axis, the first base curvature having a first radius of curvature;
an intermediate phase plate surrounding the multifocal phase plate and configured to change the overall resultant amplitude and distribution of light directed to the second focus, the intermediate phase plate comprising a second plurality of echelettes centered about the first base curvature or about a second base curvature having a second radius of curvature different from the first radius of curvature; and
an outer refractive region having a refractive optical power and no diffractive optical power, the outer refractive region surrounding the intermediate phase plate and configured to direct light to the first focus.
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Accused Products
Abstract
An ophthalmic lens for providing a plurality of foci has an optic comprising an anterior surface, a posterior surface, and an optical axis. The optic has a first region and a second region. The first region has a refractive optical power and comprises a multifocal phase plate for forming a first focus and a second focus. The second region has a refractive optical power and comprises a monofocal phase plate for forming a third focus. The multifocal phase plate and the monofocal phase plate may be disposed on first and second base curvatures, respectively, that may have different radii of curvature. The ophthalmic lens may also have an intermediate phase plate located between the multifocal phase plate and the monofocal phase plate, the intermediate phase plate comprising a third plurality of echelettes disposed on a third base curvature having a third radius of curvature.
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Citations
31 Claims
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1. An ophthalmic lens, comprising:
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an optic having an anterior surface, a posterior surface, a first base curvature, and an optical axis; a multifocal phase plate configured to direct light to a first focus and a second focus, the multifocal phase plate comprising a first plurality of echelettes centered about a first base curvature in a direction that is parallel to the optical axis, the first base curvature having a first radius of curvature; an intermediate phase plate surrounding the multifocal phase plate and configured to change the overall resultant amplitude and distribution of light directed to the second focus, the intermediate phase plate comprising a second plurality of echelettes centered about the first base curvature or about a second base curvature having a second radius of curvature different from the first radius of curvature; and an outer refractive region having a refractive optical power and no diffractive optical power, the outer refractive region surrounding the intermediate phase plate and configured to direct light to the first focus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An ophthalmic lens, comprising:
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an optic having an anterior surface, a posterior surface, and an optical axis; a multifocal phase plate configured to direct light to a first focus and a second focus, the multifocal phase plate comprising a first plurality of echelettes disposed on a first base curvature having a first radius of curvature; a monofocal phase plate comprising a second plurality of echelettes disposed on a second base curvature having a second radius of curvature different from the first radius of curvature; and an intermediate phase plate located between the multifocal phase plate and the monofocal phase plate, the intermediate phase plate comprising a third plurality of echelettes disposed on a third base curvature having a third radius of curvature and configured to change the overall resultant amplitude and distribution of light directed to the second focus. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An ophthalmic lens, comprising:
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a central phase plate configured such that the lens is able to direct light to a first focus and a second focus corresponding different diffraction orders of the phase plate, the central phase plate comprising a first base curvature having a first radius of curvature and including a central zone having an area that is less than the area of an adjacent echelette; an intermediate phase plate surrounding the central phase plate configured to change the overall resultant distribution of light directed to the second focus; and an outer refractive region having no diffractive optical power surrounding the intermediate phase plate and configured to direct light to the second focus, the outer refractive region having at least one of (1) a second base curvature having a radius of curvature that is different from the first radius of curvature and (2) an aspheric shape configured to reduce an optical aberration. - View Dependent Claims (29, 30, 31)
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Specification