Method of producing angular tolerance markings for lenses for correcting astigmatism, and associated lenses
US6086202A · kind A · utility
19Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1999 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Apr 7, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a method of producing tolerance markings on a contact lens for correcting astigmatism which has a given cylinder, the tolerance markings comprise at least two straight line segments in the peripheral part of the contact lens with an angle 2.alpha..sub.T between them. The angle 2.alpha..sub.T between the two straight line segments of the tolerance markings depends on the cylinder of the contact lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.