Diffractive lens exhibiting enhanced optical performance
US8231219B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 2009 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Dec 15, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides improved ophthalmic lenses and methods for their design and use. Monofocal and multifocal diffractive ophthalmic lenses having reduced light scatter, improved light energy distribution properties, and/or other improvements in optical performance are provided. These properties are provided, at least in part, by the diffractive profiles of the invention, often having subtlety shaped echelettes with appropriately curving profiles. Smooth diffractive profiles may be used reduce light scatter. Diffractive profiles may be configured to limit the light energy in certain selected orders, thereby improving viewing quality and mitigating unwanted effects such as dysphotopsia. Diffractive profiles of may additionally or alternatively vary the light energy distributed between individual echelettes, providing additional advantages in various viewing situations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.