OPHTHALMIC LENS WITH MULTIPLE PHASE PLATES
First Claim
1. An ophthalmic lens, comprising:
- an optic having an anterior surface, a posterior surface, and an optical axis, the optic having a refractive optical power;
a central phase plate having a diffractive power configured such that the lens is able to direct light to a first focus configured to provide near or intermediate vision and a second focus configured to provide distant vision, the central phase plate comprising a first base curvature having a radius of curvature;
an intermediate phase plate surrounding the central phase plate configured to change the overall resultant intensity 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 an aspheric shape configured to reduce an optical aberration.
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Accused Products
Abstract
An ophthalmic lens for providing a plurality of foci includes an optic having an anterior surface, a posterior surface, and an optical axis. The ophthalmic lens has a first region and a second region. The first region has a first refractive optical power and includes a first base curvature having a finite radius of curvature and a first phase plate having at least one diffraction order with a diffractive optical power. The first region is configured for forming a first focus and a second focus. The second region has a second refractive optical power and includes a second base curvature having a finite second radius of curvature that is different from the first radius of curvature and a second phase plate having at least one diffraction order with a diffractive optical power. The second region is configured for forming a third focus that is between the first focus and the second focus. The ophthalmic lens may be configured so the first focus provides distant vision, the second focus provides near vision, and the third focus provides intermediate vision.
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Citations
13 Claims
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1. An ophthalmic lens, comprising:
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an optic having an anterior surface, a posterior surface, and an optical axis, the optic having a refractive optical power; a central phase plate having a diffractive power configured such that the lens is able to direct light to a first focus configured to provide near or intermediate vision and a second focus configured to provide distant vision, the central phase plate comprising a first base curvature having a radius of curvature; an intermediate phase plate surrounding the central phase plate configured to change the overall resultant intensity 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 an aspheric shape configured to reduce an optical aberration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification