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Dual-filter ophthalmic lens to reduce risk of macular degeneration
专利权人:
High Performance Optics, Inc.
发明人:
Ishak Andrew
申请号:
US201313894602
公开号:
US9545304(B2)
申请日:
2013.05.15
申请国别(地区):
美国
年份:
2017
代理人:
Sterne, Kessler, Goldstein & Fox P.L.L.C.
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.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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