Lens reducing visual noise for VDT viewers
US4911546A · kind A · utility
Inventor
Key dates
| Filing date | Dec 20, 1985 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens is provided which can be worn, in the form of eyeglasses, for the reduction of visual noise and resulting eye strain for an observer of a visual display terminal. The lens comprises a light transmitting plastic body having convex shaped outer surface away from the eye of the observer and a concave inner surface facing the eye of the observer. The body is provided with, in combination, an ultraviolet absorber for at least substantially blocking the transmission of ultraviolet radiation incident upon the lens, a color dye for diminishing the transmission of radiation having a wavelength of between 500-600 nm, and a grey dye for reducing the transmission of visible light. A corresponding method is also provided, along with a method and a kit for producing such a lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.