Soft contact lens with surface identification and method of using same
US4525044A · kind A · utility
67Cited by
7References
21Claims
0Family size
Inventor
Key dates
| Filing date | May 5, 1983 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | May 5, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2035/0838
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A soft contact lens of generally symmetrical concavo-convex configuration and of uniform optical power about its optic axis is provided with an elongated marking in the peripheral portion thereof to permit the user to identify readily the inner surface of the lens. This marking is asymmetrical about its midpoint so that the user can determine the appropriate surface by noting the direction of asymmetry. This marking may be produced as a raised or recessed surface during moulding and casting of the lens, or as a recessed surface subsequently by etching, engraving or the like, or it may be formed by printing of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.