Abstract: An optical lens for differential correction comprising two transparent walls defining an enclosed space having therein a quantity of a transparent liquid with a predetermined optical index; the walls are so formed as to provide at the optical center a capillary space into which the liquid is aspirated when the lens is tilted at a predetermined angle for changing the power of the lens.

Abstract: A portable, compact device for sterilizing contact lenses consisting of a cell which has a single cylindrical sidewall and a removable cover having two openings for introducing an electrically conductive liquid thereinto. Two electrodes are mounted internally of the cell electrically connected to two external electrical male plugs constructed for electrical connection to an outlet. A container for receiving an asepticizing liquid therein is mounted for joint removal with said cover. The container has an externally threaded neck extending through an opening in the cover and snugly fitting therein. An internally threaded cover closes the container in a liquid-tight manner and holds therein axially in position a lens-holder that has means for removably holding a pair of contact lens thereon and upstanding grip extending externally of the neck for insertion and removal of the lens-holder.