Patent ID: 11896479
Assignee: HANITA LENSES LTD.
Field: Optics (Instruments)
Classification: CPC A  G | IPC A  G

Claim 15:
16. A multifocal intraocular lens (IOL), comprising,
at least one diffractive surface including a plurality of discrete, adjacent, diffractive, concentric Fresnel zones,
wherein said Fresnel zones comprise a first central zone having a repetitive pattern of a first diffractive profile and a second peripheral zone having a repetitive pattern of a second diffractive profile different than the first diffractive profile; and
said multifocal IOL is prefabricated such that
said first diffractive profile produces an asymmetrical first diffractive energy flux distribution over five diffractive orders: −2, −1, 0, +1 and +2; and said second diffractive profile produces a second diffractive energy flux distribution, over said five diffractive orders, different than said first diffractive energy flux distribution; and
said orders in said first and second diffractive energy flux distributions have a non-zero said energy flux, with the following orders suppressed: said −1 order in said first diffractive energy flux distribution and said −1 and said +1 order in said second diffractive energy flux distribution.