Ophthalmic lens with diffractive power
US4641934A · kind A · utility
189Cited by
11References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1983 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Sep 20, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ophthalmic lens incorporates a transmission hologram which has negative diffractive power and introduces positive longitudinal chromatic aberration to add to the natural longitudinal chromatic aberration of the human eye, thereby reducing the need to accommodate. The lens also has refractive power to balance the diffractive power or to give a desired overall or residual power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.