Ophthalmic lens
US4932970A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | May 17, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2/1613
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ophthalmic lens having a size, shape, and composition adapted to be supported by the human eye in the optical path of the eye as an intraocular, contact, or corneal implant lens, includes a biocompatible lens body having a size and shape adapted to be supported by a human eye in the optical path of the eye. An optical portion of the lens body has anterior and posterior surfaces and a grooved portion defining a modified Fresnel or echelon lens pattern in at least one of the anterior and posterior surfaces. The modified echelon lens pattern includes annular zones that are configured so that at least some of the annular zones exhibit optical characteristics that vary circumferentially in order to at least partially correct for astigmatism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.