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

Claim 0:
1. A multifocal intraocular lens (IOL) comprising,
at least one diffractive surface including a plurality of discrete, adjacent, diffractive, concentric Fresnel zones;
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;
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, the first diffractive energy flux distribution differing from the second diffractive energy flux distribution as follows:
in said first diffractive energy flux distribution, said −2 order provides a far vision, said +2 order provides a near vision, said 0 order provides a first intermediate vision, said +1 order provides a second intermediate vision and said −1 order is suppressed; and
in said second diffractive energy flux distribution, said −2 order provides said far vision, said +2 order provides said near vision, said 0 order provides said first intermediate vision, and said −1 order and +1 order are suppressed.