Dual-filter ophthalmic lens to reduce risk of macular degeneration

摘要

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 tight transmission and prevents macular degeneration, cataracts and other ocular injuries, while still preserving visual acuity.

主权项

1. A multi-layer lens comprising:
an absorptive lens layer, wherein said absorptive lens layer absorbs visible blue light within a range from 400-475 nm; and a reflective lens layer attached to said absorptive lens layer, wherein said reflective lens layer reflects UV light below 400 nm; wherein said absorptive lens layer and said reflective lens layer combine to establish an increasing transmission profile that begins to cut-on at 415 nm and maintains a positive slope to at least 440 nm.