A mold for use in producing a lens comprises a pair of first and second mold portions which are arranged in opposed relation to each other. At least one of the first and second mold portions is movable toward and away from the other. Molding surfaces of the respective first and second mold portions have their respective areas which are located radially outwardly of an effective aperture of the lens. A plurality of recesses are formed in the molding surface of at least one of the first and second mold portions and are located in the area of the molding surface of the at least one mold portion. These recesses separate the lens from the molds.