Method of designing and fitting multifocal lenses taking into account material properties of the lenses
US6196685A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Apr 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for fitting and designing an ophthalmic lens for a presbyope that yields improved visual acuity in general, and takes into account individual fitting characteristics. More specifically, a method for fitting and designing a contact or intraocular lens which takes into account material properties of the lens by observing the "print through" associated with the lens as an indicator of the topography of the lens. The term "print through" is used to refer to any change in lens topography on the front surface of the lens as a result of changes in topography on the back surface of the lens. If a significant amount of "print through" is observed, this generally indicates that the multifocal function of the lens is properly being performed. In such a situation, the clinician can then adjust the add power to the desired level. If there is not a significant amount of "print through", this generally indicates that the multifocal function of the lens is not properly being performed. In this latter situation, by observing the reduced "print through" associated with such a lens, the clinician can instead bias one lens of a lens pair for distance power and the other lens of a lens pair fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.