Photochromic ophthalmic lens of organic materials
US4300821A · kind A · utility
28Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1980 |
| Grant date | Nov 17, 1981 |
| Priority date | — |
| Expiry date | Feb 26, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An ophthalmic lens made of organic material has at least one layer of photochromic mineral glass within its mass to impart photochromic properties to the lens. This layer has a fibrous structure and may comprise a piece of woven fabric produced from fibres of photochromic mineral glass possessing a refractive index and a coefficient of chromatic dispersion which are equal to those of the constituent organic material of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.