Multifocal Lens Having a Progressive Optical Power Region and Discontinuity
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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.
102 Citations
113 Claims
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1-86. -86. (canceled)
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87. An ophthalmic lens having a fitting point, comprising:
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a far distance zone; a mostly spherical power region on a front surface of the lens for providing additive optical power to the far distance zone for providing an intermediate distance zone of the lens; a discontinuity, as viewed through the lens, located between the far distance zone and said mostly 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 mostly spherical power region for providing additive optical power to said mostly spherical power region for providing a near distance zone of the lens, wherein said mostly spherical power region and said progressive optical power region contribute to a total add power of the lens. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99)
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100. An ophthalmic lens having a far distance zone and a fitting point, comprising:
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a far distance zone; a mostly spherical power region on a front surface of the lens for providing additive optical power to the far distance zone for providing an upper far-intermediate distance zone of the lens; a discontinuity, as viewed through the lens, located between the far distance zone and said mostly 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 mostly spherical power region for providing additive optical power to said mostly spherical power region for providing an intermediate distance zone of the lens and a near distance zone of the lens, wherein said mostly spherical power region and said progressive optical power region contribute to a total add power of the lens. - View Dependent Claims (101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113)
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Specification