OCULAR MULTIFOCAL DIFFRACTION LENS Russian patent published in 2022 - IPC G02C7/02 

FIELD: medicine.

SUBSTANCE: invention relates to ocular lenses, more specifically to ocular contact and intraocular multifocal diffraction lenses providing diffraction orders with adjustable light distribution for different pupil sizes. An ocular multifocal lens is proposed, containing at least focal points for close-distance vision, medium-distance vision, and long-distance vision, having a light-transmitting lens body containing an optical axis and providing a refractive focal point, as well as a diffraction grate passing concentrically in a radial direction through at least part of at least one surface of the mentioned lens body, providing a set of diffraction focal points. The mentioned diffraction grate is periodic in r² space, intended for work as a beam splitter for the distribution of light incident on the mentioned lens body at the mentioned refractive and diffractive focal points, wherein the mentioned refractive focal point provides the mentioned focal point for medium-distance vision, and the mentioned diffractive focal points provide the mentioned focal points for close-distance vision and long-distance vision. The mentioned diffraction grate of the mentioned ocular multifocal lens contains a continuous periodic function of a phase profile, passing in a radial direction of the mentioned lens body, and the mentioned continuous periodic function of the phase profile contains an argument modulated depending on a radial distance to the mentioned optical axis of the mentioned lens body, wherein the mentioned argument is modulated so that to provide periodic smooth transitions on the mentioned continuous periodic function of the phase profile. In this case, positions of the mentioned transitions are periodic in r² space, and each transition passes through a part of the period of the mentioned continuous periodic function of the phase profile in such a way that at least one period of the continuous periodic function of the phase profile is modulated differently than at least one other period, thereby adjusting the mentioned light distribution at the mentioned diffraction focal points, wherein each transition contains at least one of: a transition providing displacement, preferably spatial and/or radial, in the mentioned continuous function of the phase profile in the radial direction of the mentioned lens body, and the transition providing displacement, preferably spatial and/or radial, in the mentioned continuous periodic function of the phase profile in a direction transverse to the mentioned at least one surface of the mentioned lens body, thereby adjusting the mentioned distribution of light incident on the mentioned lens body.

EFFECT: improvement of a design solution of an ocular lens, which would provide freedom in the determination of diffraction orders or focal points, as well as adjustment or control of the relative intensity of light at all target focal points, in particular for different pupil sizes, avoiding as much as possible the light diffraction in diffraction orders that do not contribute to target focal points, thereby providing an improved overall user experience.

13 cl, 26 dwg