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US 6,210,005 B1Granted
Multifocal ophthalmic lens with reduced halo size
OwnerValdemar Portneyinventor
Life of this patent
Estimating the term…
Abstract
Ophthalmic lenses, for example, intraocular lenses, contact lenses, corneal implant lenses and the like, have multifocal characteristics which provide beneficial reductions in at least the perception of one or more night time visual symptoms such as “halos”, and “glare or flare”.
Claims37
An ophthalmic lens having a central optical axis and a baseline diopter power for far vision correction, the ophthalmic lens comprising:
- a near zone having a highest vision correction power and including an inner region having a substantially constant vision correction power greater than the baseline diopter power, and an outer region located outwardly of the inner region and having vision correction powers which are progressively reduced from the highest vision correction power of the near zone to a reduced near vision correction power which is about 50% to about 85% of the highest vision correction power of the near zone, the inner region has an innermost end at which the lens has the substantially constant vision correction power at a radial location closest to the central optical axis and the outer region has an outermost end, each of the inner region and the outer region having a radial width and the radial width of the inner region being in a range of about 30% to about 65% of a radial distance between the innermost end of the inner region and the outermost end of the outer region, the near zone having vision correction powers greater than the baseline diopter power which reduce the size of a halo caused by passing light to the near zone relative to the halo caused by passing light to a similar near zone of a substantially identical lens in which the similar near zone has a constant vision correction power throughout.
An ophthalmic lens having a baseline diopter power for far vision correction, the ophthalmic lens comprising:
- a central zone including a center region at a central optical axis of the ophthalmic lens and having a vision correction power, an intermediate region at a radial location outwardly of the center region and having a vision correction power which is the highest vision correction power in the central zone, and an outer region at a radial location outwardly of the intermediate region and having a vision correction power equal to the vision correction power of the center region, provided that the highest vision correction power in the central zone is at a radial location closer to the center region than to the radial location of the outer region, and the lowest optical power in the central zone is at or above the baseline diopter power.
An ophthalmic lens having a baseline diopter power for far vision correction, the ophthalmic lens comprising:
- a near zone including an inner region having a substantially constant vision correction power greater than the baseline diopter power, and having vision correction powers greater than the baseline diopter power which reduce the size of a halo caused by passing light to the near zone relative to the halo caused by passing light to a similar near zone of a substantially identical lens in which the similar near zone has a constant vision correction power throughout;
- and
- an additional near zone located outwardly of the near zone and having vision correction powers greater than the baseline diopter power, wherein the near zone and the additional zone each have a radial width and the radial width of the additional near zone is less than about 40% of the radial width of the near zone.
An ophthalmic lens having a baseline diopter power for far vision correction, the ophthalmic lens comprising:
- a central zone including a center region at a central optical axis of the ophthalmic lens and having a vision correction power, an intermediate region at a radial location outwardly of the center region and having a vision correction power which is the highest vision correction power in the central zone, and an outer region at a radial location outwardly of the intermediate region and having a vision correction power equal to the vision correction power of the center region, provided that the highest vision correction power in the central zone is at a radial location closer to the center region than to the outer region;
- a first outer zone located outwardly of the central zone and having a vision correction power less than the baseline diopter power;
- a second outer zone located outwardly of the first outer zone and having a vision correction power greater than the baseline diopter power;
- and
- a third outer zone located outwardly of the second outer zone and having a vision correction power greater than the baseline diopter power.
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Dependencies are inferred from the claim text.