Pseudo-accomodative iol having multiple diffractive patterns

Details Pseudo-accomodative iol having multiple diffractive patterns Pseudo-accomodative iol having multiple diffractive patterns

G - Physics

02

C

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

Patent

CA 2642019

In one aspect, a trifocal ophthalmic lens is disclosed that includes an optic having a surface that comprises at least one trifocal diffractive pattern and at least one bifocal diffractive pattern such that the bifocal pattern provides near and far vision and the trifocal pattern generates near, far, and intermediate vision. For example, the trifocal pattern can provide near, far, and intermediate foci such that the near and far foci are substantially coincident, respectively, with a near and a far focus of the bifocal pattern. In this manner, the trifocal and bifocal patterns collectively provide near, intermediate, and far foci (or focal regions) corresponding, respectively, to the near, intermediate and far vision.

L'invention porte selon un aspect sur des verres ophtalmiques trifocaux dont la surface comporte au moins un réseau diffracteur trifocal et un réseau diffracteur bifocal, le réseau bifocal correspondant à la vision proche et lointaine, et le réseau trifocal, à la vision proche, lointaine et intermédiaire. Par exemple la disposition trifocale peut former des foyers proche, lointain ou intermédiaire, les foyers lointain et proche étant alors pratiquement confondus, et correspondant à une disposition bifocale. Ainsi les dispositions trifocale et bifocale forment ensemble des foyers proche, intermédiaire et lointain correspondant respectivement à la vision proche, intermédiaire et lointaine.

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