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US 8,360,574 B2Granted
High performance selective light wavelength filtering providing improved contrast sensitivity
AssigneeHigh Performance Optics, Inc.
InventorsAndrew W. Ishak, Joshua N. Haddock, William Kokonaski, Dwight P. Duston, Venkatramani S. Iyer, Ronald D. Blum, Sean P. McGinnis, Michael B. Packard
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Abstract
The present invention relates to ophthalmic systems comprising a selective light wavelength filter, wherein said selective filter provides improved contrast sensitivity.
Claims45
An ophthalmic system comprising:
- an ophthalmic lens selected from the group consisting of a spectacle lens, contact lens, intra-ocular lens, corneal inlay, corneal onlay, corneal graft, and corneal tissue, and
- a selective light wavelength filter that blocks 5-50% of light having a wavelength in the range of 400-460 nm and transmits at least 80% of light having a wavelength in the range of 460-700 nm;
- wherein the system exhibits a yellowness index of no more than 15.
An ophthalmic system comprising:
- an ophthalmic lens selected from the group consisting of a spectacle lens, contact lens, intra-ocular lens, corneal inlay, corneal onlay, corneal graft, and corneal tissue;
- and
- a selective light wavelength filter that selectively filters 5-50% of light in a range of blue light wavelengths that includes 430 nm;
- wherein the system exhibits a yellowness index of no more than 15;
- and wherein the system has an average transmission of at least 80% across the visible spectrum.
2 more elements
Dependencies are inferred from the claim text.