Pseudo-accommodative IOL having diffractive zones with varying areas
US7717558B2 · kind B2 · utility
43Cited by
9References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 16, 2009 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Jan 16, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In one aspect of the invention, a multifocal ophthalmic lens includes an optic and a plurality of diffractive zones disposes about an optical axis of the optic. At least two of the diffractive zones have different areas so as to cause broadening of optical energy profiles at a near focus and a far focus of the diffractive zones for generating an intermediate focus. A fraction of incident optical energy directed to the intermediate focus is different from a fraction of incident optical energy directed to at least one of the near or far foci.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.