US Patent 11194222 Multifocal system using adaptive lenses

A device is provided. The device includes a first lens assembly controllable to switch between a first plurality of optical powers. The first lens assembly includes a plurality of directly optically coupled lenses. The device also includes a second lens assembly controllable to switch between a second plurality of optical powers that are the opposite of the first plurality of optical powers. The device further includes a half-wave plate disposed between the first adaptive lens assembly and the second adaptive lens assembly.