Dual-filter ophthalmic lens to reduce risk of macular...

G - Physics – 02 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G02B 5/22 (2006.01) G02B 1/04 (2006.01) G02C 7/10 (2006.01)

Patent

CA 2720471

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.

L'invention porte sur une lentille perfectionnée à double filtre pour des lunettes de protection, qui combine un premier filtre pour bloquer essentiellement 100 % de la lumière ultraviolette, et un second filtre pour filtrer la lumière bleue. Le premier filtre peut comprendre une couche de miroir diélectrique à multiples couches 14 ou un filtre Rugate 50, et le second filtre peut comprendre une ou des couches de lentille imprégnées de colorant 16, 18 ou un filtre Rugate 50. Le premier filtre bloque essentiellement 100 % de la lumière ultraviolette, tandis que le second filtre établit un profil de transmission croissant qui coupe de façon nette à approximativement 415 nm, et établit un profil de transmission croissant entre approximativement 415 nm et environ 475 nm. La pente de coupure augmente approximativement de 0,15 % en transmissivité pour chaque nanomètre de changement croissant de longueur d'onde, avec un effet de filtrage maximal dans la plage de 440-465 nm. Ces filtres doubles fournissent un profil de transmission de lumière équilibré qui réduit une transmission de lumière nuisible et empêche une dégénérescence maculaire, des cataractes et autres lésions oculaires, tout en préservant toujours l'acuité visuelle.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Dual-filter ophthalmic lens to reduce risk of macular... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual-filter ophthalmic lens to reduce risk of macular..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual-filter ophthalmic lens to reduce risk of macular... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1412219

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.