Ophthalmic lenses with diffractive power
US4655565A · kind A · utility
163Cited by
3References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1985 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Feb 13, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/22
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A contact or spectacle or implant lens has positive diffractive power which introduces negative longitudinal chromatic aberration that more than counteracts, and is preferably greater than twice, the natural positive longitudinal chromatic aberration of the eye. The residual negative longitudinal chromatic aberration enables the eye/brain system to perform tasks by concentrating on the appropriate color component at the different respective distances without need to accommodate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.