Filters to enhance color discrimination for color vision deficient individuals
US10054803B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2014 |
| Grant date | Aug 21, 2018 |
| Priority date | — |
| Expiry date | Jan 8, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/285
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Certain filters have been found to enhance color discrimination for individuals with color vision deficiency (CVD), aka color-blind individuals. The filters generally include a multilayer optical film with a strong, narrow reflection band in part of the green region of the visible spectrum. The film has an average internal transmission from 420-680 nm of at least 50%, 60%, or 70%, and an average internal transmission≤10%, 5%, 2%, or 1% over a 10 nm wide range that includes 550 nm associated with a reflection band having a width (FWHM) of 60 nm or 50 nm or less. The filter may include a magenta layer disposed on a viewer side of the multilayer optical film to reduce glare, the magenta layer selectively absorbing green light. The magenta layer combined with the multilayer optical film may provide a rejection band whose width (FWHM) is 60 nm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.