Disposable molds and method of using the same

A casting device, comprising:

• a. a ring having an interior periphery;
• b. a plurality of front molds, each front mold formed of a plastic and having a lens-forming surface, and the front molds providing an edge circumscribing the lens-forming surface that is sized to be complementarily received within a portion of the interior periphery of the ring, and a base having dimensions greater than the interior periphery;
• and
• c. a rear mold formed of a plastic and having a lens-forming surface, the rear mold configured to be paired with each of the plurality of front molds, a rim circumscribing the lens-forming surface that is sized to be complementarily received within a portion of the interior periphery of the ling, and a flange having dimensions greater than the interior periphery;
• wherein when the edge of each of the front molds and the rim of the rear mold are configured to be received by the ring, the lens-forming surfaces of the front and rear molds and the ring form a mold cavity which has dimensions of a desired lens formable therein;
• and
• wherein the plurality of front molds are configured to form lenses of different effective diameters.