Method for making colored photochromic prescription ophthalmic lenses
US4498919A · kind A · utility
26Cited by
10References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1983 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Oct 31, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C21/002
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Colored photochromic ophthalmic lenses are produced by combining a photochromic cap element having an integrally colored back surface with an ophthalmic crown base element having a prescription-ground back surface, the cap back and base element front surfaces having been finished to a matching standard base curvature, thus providing a cemented assembly exhibiting a selected combination of prescribed vision-correcting and light filtering properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.