Liquid lens with a laterally arranged pump portion

A lens having an adjustable optical power comprising a container with

• a frame structure, wherein the frame structure delimits a lens volume and a reservoir volume at least partially in a lateral direction, wherein the lens volume and the reservoir volume are fluidically connected,
• a first opening extending through the frame structure, wherein
• the lens volume is arranged at least partially in the first opening,
• a bottom structure and an elastically deformable transparent first membrane delimit the lens volume on opposite sides of the first opening,
• a second opening extending through the frame structure, wherein
• the reservoir volume is arranged at least partially in the second opening,
• a further membrane portion delimits the reservoir volume on one side of the second opening,
• a transparent second membrane separating a first volume filled with a first liquid from a second volume filled with a second liquid,
• the first volume and the second volume are arranged in the lens volume, and
• a spacer is arranged between the second membrane and the first membrane,
• wherein the lens comprises a piston structure arranged on a side of the further membrane portion covering the second opening, wherein the piston structure is movable towards or away from the second opening such as to pump the first or the second liquid from the reservoir volume to the lens volume or vice versa.