Achromat lens doublets are used as telescope objectives, eye loupes, magnifying glasses and eyepieces. The origin of the technical term "achromatic" is in the color-corrected performance of compound lenses. The optical performance of compound lenses, two or more single elements designed to work together, is superior to that of single achromat lens elements working alone. These lenses can be found in a wide variety of instruments. Since the development of the laser, doublets have also been used to focus and manipulate laser beams because their image quality is superior to that of achromat lens singlets.