Multifocal lens having a progressive optical power region and a discontinuity
First Claim
1. A multifocal ophthalmic lens comprising:
- a far distance zone having a far distance optical power;
a spherical power region for providing additive optical power to the far distance optical power, the spherical power region having an aspheric region that encircles the spherical power region;
a discontinuity, as viewed through the lens, located between the far distance zone and said spherical power region; and
a progressive optical power region on a back surface of the lens that overlaps as viewed through the lens at least a portion of said spherical power region for providing additive optical power to said spherical power region, the progressive optical power region and the spherical power region together providing a near distance zone of the lens,wherein said spherical power region and said progressive optical power region contribute to a total add power of the lens.
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Abstract
Embodiments of the present invention relate to a multifocal lens having a mostly spherical power region and a progressive optical power region. Embodiments of the present invention provide for the proper alignment and positioning of each of these regions, the amount of optical power provided by each of the regions, the optical design of the progressive optical power region, and the size and shape of each of the regions. The combination of these design parameters allows for an optical design having less unwanted astigmatism and distortion as well as both a wider channel width and a shorter channel length compared to conventional PALs. Embodiments of the present invention may also provide a new, inventive far-intermediate distance zone and may further provide for increased vertical stability of vision within a zone of the lens.
266 Citations
17 Claims
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1. A multifocal ophthalmic lens comprising:
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a far distance zone having a far distance optical power; a spherical power region for providing additive optical power to the far distance optical power, the spherical power region having an aspheric region that encircles the spherical power region; a discontinuity, as viewed through the lens, located between the far distance zone and said spherical power region; and a progressive optical power region on a back surface of the lens that overlaps as viewed through the lens at least a portion of said spherical power region for providing additive optical power to said spherical power region, the progressive optical power region and the spherical power region together providing a near distance zone of the lens, wherein said spherical power region and said progressive optical power region contribute to a total add power of the lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification