Toric contact lens markings
US6491393B1 · kind B1 · utility
16Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1997 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Nov 24, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0025
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Toric contact lenses are provided with markings that enable identification of the offset between the cylindrical axis of the toric zone and the ballast axis. Surfaces of the lenses include two markings, a first identifiable marking that is aligned with the cylindrical axis, and a second identifiable marking that is aligned with the ballast axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.