Dual-filter ophthalmic lens to reduce risk of macular degeneration
First Claim
1. A lens comprising:
- a polymer material; and
at least two filters incorporated in the polymer material of said lens, said two filters combining to block all UV light and selectively filter blue and violet light pursuant to a sharp cut-on filter with increasing transmission profile between approximately 415 nm to about 475 nm.
1 Assignment
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Accused Products
Abstract
An improved dual-filter lens for protective eyewear that combines a first filter for blocking essentially 100% of UV light, and second filter for filtering blue light. The first filter may comprise a multi-layered dielectric mirror layer 14 or Rugate filter 50, and the second filter may comprise dye-impregnated lens layer(s) 16, 18 or Rugate filter 50. The first filter blocks essentially 100% of UV light, while the second filter establishes an increasing transmission profile that cuts on sharply at approximately 415 nm, and establishes an increasing transmission profile between approximately 415 nm to about 475 nm. The cut-on slope rises approximately 0.15% in transmissivity for every nanometer of increasing wavelength change, with a maximum filtering effect within the 440-465 nm range. These dual filters provide a balanced light transmission profile that reduces harmful light transmission and prevents macular degeneration, cataracts and other ocular injuries, while still preserving visual acuity.
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Citations
29 Claims
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1. A lens comprising:
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a polymer material; and at least two filters incorporated in the polymer material of said lens, said two filters combining to block all UV light and selectively filter blue and violet light pursuant to a sharp cut-on filter with increasing transmission profile between approximately 415 nm to about 475 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 15. An ophthalmic lens comprising two filters, whereby one filter blocks essentially 100% of UV light, and the other filter filters blue light.
Specification