This U.S. industry comprises establishments primarily engaged in one or more of the following: (1) manufacturing optical instruments and lenses, such as binoculars, microscopes (except electron, proton), telescopes, prisms, and lenses (except ophthalmic); (2) coating or polishing lenses (except ophthalmic); and (3) mounting lenses (except ophthalmic). Cross-References. Establishments primarily engaged in--