Progressive addition lenses
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsRussell A. Chipman, Patrick John Reardon
Life of this patent
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Abstract
The present invention relates to ophthalmic lenses. In particular, the invention provides ophthalmic lenses with reduced astigmatism. The lenses are composed of a surface and a compensating surface, the surface geometries of which are defined by segments of a size suitable to be defined by a tenth order x,y polynomial with Zernike coefficients.
Claims18
A lens having an astigmatism caused by at least one surface of the lens, the lens comprising a front surface and a compensating surface wherein the compensating surface compensates for the lens astigmatism, the compensating surface comprising a plurality of segments wherein each of the plurality of segments is defined by a tenth order x, y polynomial with Zernike coefficients.
A lens having an astigmatism caused by at least one surface of the lens, the lens comprising a front surface and a discontinuous compensating surface wherein the compensating surface compensates for the lens astigmatism, the compensating surface comprising a plurality of segments wherein each of the plurality of segments is defined by a tenth order x, y polynomial with Zernike coefficients.
A lens having an astigmatism caused by at least one surface of the lens, the lens comprising a front surface and a continuous compensating surface wherein the compensating surface compensates for the lens astigmatism, the compensating surface comprising a plurality of segments wherein each of the plurality of segments is defined by a tenth order x, y polynomial with Zernike coefficients.
A method for providing a lens comprising the steps of:
- a.) dividing a front surface of a lens into a first plurality of segments, each of the plurality of segments of a size suitable for a tenth order x, y polynomial with Zernike coefficients to define the geometry for each segment;
- b.) providing a compensating surface the compensating surface divided into a second plurality of segments of a size suitable for a tenth order x, y polynomial with Zernike coefficients to define a geometry for each segment wherein the compensating surface compensates for the lens astigmatism;
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- c.) optimizing the compensating surface to reduce a lens astigmatism of the lens.
Dependencies are inferred from the claim text.