DIFFRACTION STRUCTURE WITH PHASE SHIFT OF CENTRE AND FAR ZONE FOR OCULAR IMPLANT Russian patent published in 2015 - IPC A61F2/16 A61F9/00 A61F9/07 

FIELD: medicine.

SUBSTANCE: group of inventions refers to medicine. An ocular implant comprises: a diffraction multifocal intraocular lens (IOL implant) configured to provide long-range, short-range and medium-range foci; a set of haptic elements coupled with the diffraction multifocal IOL implant and configured to localise the diffraction multifocal IOL implant inside the eye. The diffraction multifocal IOL implant has a thin edge making it possible to make the incision smaller. The diffraction multifocal IOL implant comprises a bifocal diffraction zone only providing the long-range and short-range foci, a refraction zone of centre and far zone, and an outer refraction zone. A phase of the outer refraction zone matches with a phase of a bifocal diffraction zone, and a phase of the refraction zone of centre and far zone is phase-shifted from the bifocal diffraction zone within 1/8 to 1/16 of the wavelength to shift the phase of light energy so that the constructive interference between the refraction zone of the centre and far zone and the bifocal diffraction zone occurs in the long-range focus, and in the medium-range focus. A method for correcting visual deterioration in aphakia contains the stages: removing a natural crystalline lens; inserting the diffraction multifocal intraocular lens; arranging and fixing the diffraction multifocal IOL implant inside the eye by means of the set of haptic elements coupled with the diffraction multifocal IOL implant.

EFFECT: using the given group of inventions enables improving the vision with the day-light constricted pupil and half-light dilated pupil.

7 cl, 6 dwg