Method of making progressive lens surface and resulting article
US4676610A · kind A · utility
43Cited by
5References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1983 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Jul 22, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The disclosure relates to progressive power or multifocal ophthalmic lens and methods and formers for making such lens. The optical power of such lens varies gradually from a near viewing zone to a distance viewing zone. Selected mathematical functions are progenitive of the lens and former shapes, and steps of the methods are characterized by various mathematical functions, and coordinate systems which are constrained to provided the desired transition of optical powers in an intermediate zone of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.