MULTIFOCAL CORRECTION PROVIDING IMPROVED QUALITY OF VISION Russian patent published in 2015 - IPC G02C7/04 A61F2/14 G02B3/10 

FIELD: physics, optics.

SUBSTANCE: correcting optical lens, adapted to move together with the eye of the user and change the refracting power thereof, comprises a first radial optical area having a first refracting power which, coupled with the refracting power of the eye of the user, results in a first effective refracting power which rises as the radius of the first radial optical area increases, and a second radial optical area having a second refracting power which, coupled with the refracting power of the eye of the user, results in a second effective refracting power which falls as radius of the second radial optical area increases. The first effective refracting power is greater than the second effective refracting power. The dimensions and refracting power of the first and second radial optical areas are intended to weaken visibility of defocused radiation for the user.

EFFECT: eliminating or minimising visibility of ghost images through control of the sign of spherical aberration or other asphericity which depends on a specific area.

20 cl, 9 dwg