Photochromic optical lens with selective blue light attenuation
US10175508B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2017 |
| Grant date | Jan 8, 2019 |
| Priority date | — |
| Expiry date | Mar 10, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is a photochromic eyewear lens product comprising photochromics material(s) and selective filtering agent(s) that selectively attenuate a portion of the blue light spectral region between 400 nm and 500 nm. The selective attenuation preferably comprises a maximum reduction in transmittance in the filtered region of about 10-25% T relative to at least one adjacent spectral region when the lens product is in the rest state, and a maximum reduction in transmittance that is measurably less than the transmittance of at least one adjacent region of the visible spectrum when the lens product has darkened in the activated state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.