Contact lens with moulded inversion mark
US6568807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Oct 18, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/046
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A contact lens is provided that has visible inversion marks on the lens. The marks include a plurality of recessed spots having side walls, a substantially convex bottom surface, and a relatively shallow maximum depth of between about 7.5 microns and 12 microns. The recessed spots provide a highly visible marking indicia on a contact lens with maximum comfort to wear.A method is also provided to make the inversion marks. The method includes projecting one or more laser beam pulses through a laser beam mask to etch an array of recessed spots in a surface of a contact lens mold insert and then scanning the insert and mask synchronously with respect to the laser beam pulses thereby forming the inversion mark on the mold insert. The mold insert is used to make casting cups for cast-molding contact lenses, through which the inversion marks are reproduced on the contact lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.