Ophthalmic tinted lens
US11644689B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2019 |
| Grant date | May 9, 2023 |
| Priority date | — |
| Expiry date | May 25, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/108
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An ophthalmic tinted lens has a visual transmission value TV for quantifying a first light intensity ratio which relates to light effective for human vision and transmitted through the lens in daylight condition, and also has a value of a chronobiological factor FC for quantifying a second light amount ratio which relates to light effective for a non-visual physiological effect and also transmitted through the lens in daylight condition. The TV-value and the FC-value expressed as percentage values meet the following condition: FC>1.1×TV+13.0 with 3%≤TV≤43%, or FC>0.7×TV+32 with 43%<TV≤92%, for the ophthalmic tinted lens to combine solar protection and maintenance of circadian rhythms and better pupil constriction which are based on the non-visual physiological effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.