Colored plastic lens reducing visual noise for VDT viewers
US5080688A · kind A · utility
Inventor
Key dates
| Filing date | Mar 15, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Mar 15, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/108
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens reduces eye strain and fatigue due to glare, after images, reflections or other visual noise incident upon an observer of a visual display terminal. The lens includes a light transmitting plastic body having a convex shaped outer surface for deflecting stray angular radiation and a body provided, in combination with, an ultraviolet absorber to block the transmission of ultraviolet radiation, a colored dye to diminish the intensity of any fluorescent light incident upon the lens and to diminish the transmission of either or both green color radiation or yellow color radiation through the lens and a grey dye to reduce the transmission of incident light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.