An extended depth of focus (edof) lens to increase...

G - Physics – 02 – C

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G02C 7/06 (2006.01) A61F 2/16 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2729175

In one aspect, the present invention provides an oph-thalmic lens (e g, an IOL) that includes an optic having an anterior surface and a posterior surface disposed about an optical axis At least one of the surfaces (e g, the anterior surface) has a profile character-ized by superposition of a base profile and an auxiliary profile The auxiliary profile can include an inner region, an outer region and a transition region between the inner and the outer regions, where an optical path difference across the transtion region (i e, the optical path difference between the inner and the outer radial boundaries of the transition region) corresponds to a non-integer fraction (e g, 1/2) of a design wavelength (e g , a wavelength of about 550 nm)

Sous un aspect, la présente invention porte sur une lentille ophtalmique (par exemple, une lentille intraoculaire IOL) qui comprend un élément optique ayant une surface antérieure et une surface postérieure disposées autour d'un axe optique. Au moins l'une des surfaces (par exemple, la surface antérieure) a un profil caractérisé par une superposition d'un profil de base et d'un profil auxiliaire. Le profil auxiliaire peut comprendre une région interne, une région externe et une région de transition entre les régions interne et externe, une différence de trajet optique à travers la région de transition (c'est-à-dire, la différence de trajet optique entre les frontières radiales interne et externe de la région de transition) correspondant à une fraction non entière (par exemple, 1/2) d'une longueur d'onde de conception (par exemple, une longueur d'onde d'environ 550 nm).

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