Contact lens bifocal with switch
US5108169A · kind A · utility
162Cited by
2References
14Claims
0Family size
Inventor
Key dates
| Filing date | Feb 22, 1991 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Feb 22, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A bifocal contact lens which contains two optical powers and a structure which serves as a switch to determine which power is operative as the wearer looks alternatively at objects located at various distances. The lens switch is designed so as to be triggered by the upper lid as it covers and uncovers various portions of the contact lens when the lens wearer is looking alternatively at objects located at various distances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.