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US 8,522,653 B2Granted
Lens surface with combined diffractive, toric, and aspheric components
AssigneeNovartis AG
InventorsXin Hong, Drew Morgan
Life of this patent
Estimating the term…
Abstract
In one aspect, the present invention provides an intraocular lens (IOL) that includes an optic comprising an anterior surface, a posterior surface, and a plurality of diffractive zones disposed on one of those surfaces. The surface having the diffractive zones has a profile characterized by a combination of aspheric and toric components.
Claims23
A method of fabricating an intraocular lens (IOL), comprising providing an optical blank comprising an anterior surface and a posterior surface;
- forming a base profile on one of the surfaces, the base profile being characterized by a combination of asphericity and toricity, using a diamond cutting head positioned by a precision lathe module and a fast tool servo (FTS) module, the precision lathe module and the FTS servo module operating independently, wherein the precision lathe module generates a rotationally symmetric component of the base profile and the FTS module generates a rotationally asymmetric component of the base profile and wherein inputs from both of the modules are combined to determine a position for the diamond cutting head during the forming of the base profile;
- and forming a plurality of diffractive zones on the surface having the combined base profile.
A method of fabricating a diffractive ophthalmic lens, comprising
- providing an optic having an anterior surface and a posterior surface, forming a profile characterized by a combination of diffractive, aspheric and toric components on at least one of the surfaces using a diamond cutting head positioned by a precision lathe module and a fast tool servo (FTS) module, the precision lathe module and the FTS servo module operating independently, wherein the precision lathe module generates a rotationally symmetric component of the base profile and the FTS module generates a rotationally asymmetric component of the base profile and wherein inputs from both of the modules are combined to determine a position for the diamond cutting head during the forming of the base profile.
Dependencies are inferred from the claim text.