Contact lenses providing improved visual acuity
US5815239A · kind A · utility
131Cited by
6References
14Claims
0Family size
Inventors
Key dates
| Filing date | Dec 5, 1996 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Dec 5, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for obtaining contact lenses having optimized visual acuity involves providing the anterior surface or the posterior surface of the contact lens with a conic section having a shape factor value within the range of about 0.3 to 2.0, the shape factor value being selected so as to adjust spherical aberration in the central optical zone to a value within the range of about -0.2 diopter to about -0.6 diopter and to a value that provides optimal visual acuity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.