Bifocal contact lens
US4618229A · kind A · utility
110Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1983 |
| Grant date | Oct 21, 1986 |
| Priority date | — |
| Expiry date | Jul 22, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/048
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A ballasted multifocal contact lens has a vent for releasing constrictive pressure provided in its lower and ballasted portion. The vent has a surface which tapers from the anterior surface toward the posterior surface to allow the lens to be positioned below the inferior lid. A stabilizing portion is formed on the lens adjacent each side of the vent. The stabilizing portions engage the inferior lid and adjust the lens should it be rotated off axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.