Aspherical diffractive ophthalmic lens
First Claim
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1. A multifocal ophthalmic lens comprising:
- a lens element having an anterior surface and a posterior surface;
a central aspherical refractive zone, providing a range of foci that includes far focus, disposed on one of the anterior and posterior surfaces; and
a diffractive bifocal zone disposed outside of the aspherical refractive zone.
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Abstract
A multifocal ophthalmic lens includes a lens element having anterior and posterior surfaces with a central aspherical refractive zone disposed on one of the anterior and posterior surfaces; and a diffractive bifocal zone disposed outside of the aspherical refractive zone. The central aspherical refractive zone may be disposed on the anterior surface and the diffractive bifocal zone may be disposed on the posterior surface.
196 Citations
31 Claims
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1. A multifocal ophthalmic lens comprising:
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a lens element having an anterior surface and a posterior surface; a central aspherical refractive zone, providing a range of foci that includes far focus, disposed on one of the anterior and posterior surfaces; and a diffractive bifocal zone disposed outside of the aspherical refractive zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A multifocal ophthalmic lens comprising:
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a lens element having an anterior surface and a posterior surface; a central aspherical refractive zone, providing a range of powers that includes distance vision, disposed on said anterior surface and centered on a transverse axis; and a diffractive bifocal zone disposed on said posterior surface and centered on the transverse axis. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of designing an aspherical diffractive multifocal surface with a diffractive, multifocal annular zone comprising:
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a) selecting a base curve defining far (distant) focus; b) calculating the position of grooves located at radii r.sub.i, for the base curve to produce near focus; c) establishing a size of a central aspherical zone and corresponding aspherization to produce a range of foci around far focus; and d) selecting a step height for grooves within the diffractive annular zone to create a balance of light between far and near foci that complements contribution of central aspherical zone.
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29. A method of designing an aspherical diffractive multifocal lens with a diffractive, multifocal annular zone utilizing anterior and posterior surfaces comprising:
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a) selecting a base curve defining far (distant) focus; b) calculating a position of grooves located at radii r.sub.i, for the base curve to produce near focus on one of the lens surfaces; c) establishing a size of the central aspherical zone and its corresponding aspherization on the other lens surface to produce a range of foci around far focus; d) limiting an internal diameter of the diffractive annular zone to a external diameter of the central aspherical zone; and e) selecting a step height for the grooves within the diffractive annular zone to create a balance of light between far and near foci that complements contribution of central aspherical zone.
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30. A multifocal ophthalmic lens comprising:
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a lens element having an anterior surface and a posterior surface; a central aspherical refractive zone, providing several discrete refractive powers, disposed on one of the anterior and posterior surfaces; and a diffractive bifocal zone disposed outside of the aspherical refractive zone.
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31. A multifocal ophthalmic lens comprising:
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a lens element having an anterior surface and a posterior surface; a central aspherical refractive zone, providing a range of powers, disposed on one of the anterior and posterior surfaces; and a diffractive bifocal zone disposed outside of the aspherical refractive zone.
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Specification