Methods for fabricating annular mask lens having diffraction-reducing edges
US5965330A · kind A · utility
122Cited by
18References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1996 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Dec 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods for fabricating annular mask lens for vision correction having diffraction-reducing edges are provided. The lens body having an annular mask that forms a "soft edge" by gradually decreasing the transmissivity radially from the center aperture to the annular mask area. The methods introduce varying levels of a coloring agent (e.g., dye) into certain portions of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.