Special lens and glasses equipped with the same
US4818095A · kind A · utility
Inventor
Key dates
| Filing date | Jun 19, 1986 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Jun 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The effect of the glasses of this invention is estimated and is summarized as follows: PA0 (1) The effect of reducing the consciousness of eye fatigue is seen. PA0 (2) There is a tendency that the mental subjective symptoms are reduced. PA0 (3) Because the sense of fatigue is reduced, concentration becomes easier and it is presumed that it is helpful in preventing irritation and weariness. Since fatigue differs depending on the length of working time, it seems to be necessary to take into consideration the effect due to other fatigue than eye fatigue and the effect of motivation. It seems also necessary to investigate under different conditions the latent fatigue which has not been covered in this report.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.