This U.S. industry comprises establishments primarily engaged in coating, laminating, tempering, or shaping purchased glass. Cross-References. Establishments primarily engaged in-- ? Manufacturing optical lenses (except ophthalmic), such as magnifying, photographic, and projection lenses--are classified in U.S. Industry 333314, Optical Instrument and Lens Manufacturing; ? Manufacturing ophthalmic (i.e., eyeglass) lenses--are classified in U.S. Industry 339115, Ophthalmic Goods Manufacturing; and ? Manufacturing fiber optic cable from purchased fiber optic strand--are classified in U.S. Industry 335921, Fiber Optic Cable Manufacturing.