Apodized aspheric diffractive lenses

Details Apodized aspheric diffractive lenses Apodized aspheric diffractive lenses

A - Human Necessities

61

F

A61F 2/16 (2006.01)

Patent

CA 2590085

Aspheric diffractive lenses (10) are disclosed for ophthalmic applications. For example, multifocal intraocular lens (IOLs) are disclosed that include an optic (12) having an anterior surface (14)and a posterior surface (16), at least one of which surfaces includes an aspherical base profile (30) on a portion of which a plurality of diffractive zones (22a) are disposed so as to geneate a far focus and a near focus. The aspherical base profile enhances image contrast at the far focus of the lens relative to that obtained by a substantially identifical IOL in which the respective base profile is spherical

On décrit des lentilles diffractives asphériques destinées à des applications ophtalmiques. On décrit, par exemple, des lentilles intraoculaires multifocales (LIO), qui comprennent une optique présentant une surface antérieure et une surface postérieure, au moins l'une desdites surfaces comprenant un profil de base asphérique sur une partie duquel une pluralité de zones diffractives sont ménagées de façon à produire une focalisation éloignée et une focalisation rapprochée. Le profil de base asphérique améliore le contraste de l'image en focalisation éloignée de la lentille relativement à celui obtenu par une LIO sensiblement identique dans laquelle le profil de base respectif est sphérique.

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