PSEUDOACCOMODATIVE INTRAOCULAR LENSES WITH VARIABLE DIFFRACTION REGIONS Russian patent published in 2011 - IPC G02C7/06 A61F2/16 

FIELD: medicine.

SUBSTANCE: multifocus ophthalmologic lens contains an optic element having at least one optic surface and a set of diffraction regions surrounding an optical axis of the optic element, at least two variable diffraction regions. According to the invention, external and internal diffraction regions direct the incident light energy to near and far focuses respectively to enable in common resulting near, intermediate and far focuses; the incident light energy directed to each resulting near and far focuses exceeds a fraction of the incident light energy directed to the intermediate focus.

EFFECT: provided intermediate sight with no darkening of near and far vision.

21 cl, 8 dwg